./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/relax-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/relax-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa --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 d53812dd1177b266d0f37d9b3339dda1620cf3a3734db2ec7312de8297126685 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-12-06 21:52:25,857 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-06 21:52:25,859 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-06 21:52:25,883 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-06 21:52:25,883 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-06 21:52:25,885 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-06 21:52:25,886 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-06 21:52:25,888 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-06 21:52:25,889 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-06 21:52:25,890 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-06 21:52:25,891 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-06 21:52:25,892 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-06 21:52:25,892 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-06 21:52:25,893 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-06 21:52:25,894 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-06 21:52:25,896 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-06 21:52:25,896 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-06 21:52:25,897 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-06 21:52:25,899 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-06 21:52:25,900 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-06 21:52:25,902 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-06 21:52:25,903 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-06 21:52:25,905 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-06 21:52:25,906 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-06 21:52:25,909 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-06 21:52:25,910 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-06 21:52:25,910 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-06 21:52:25,911 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-06 21:52:25,912 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-06 21:52:25,913 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-06 21:52:25,913 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-06 21:52:25,914 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-06 21:52:25,915 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-06 21:52:25,916 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-06 21:52:25,917 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-06 21:52:25,917 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-06 21:52:25,917 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-06 21:52:25,918 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-06 21:52:25,918 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-06 21:52:25,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-06 21:52:25,919 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-06 21:52:25,920 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-06 21:52:25,944 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-06 21:52:25,945 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-06 21:52:25,945 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-06 21:52:25,945 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-06 21:52:25,946 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-06 21:52:25,946 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-06 21:52:25,947 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-06 21:52:25,947 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-06 21:52:25,947 INFO L138 SettingsManager]: * Use SBE=true [2021-12-06 21:52:25,947 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-06 21:52:25,947 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-06 21:52:25,948 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-06 21:52:25,948 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-06 21:52:25,948 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-06 21:52:25,948 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-06 21:52:25,948 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-06 21:52:25,948 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-06 21:52:25,949 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-06 21:52:25,949 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-06 21:52:25,949 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-06 21:52:25,949 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-06 21:52:25,949 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-06 21:52:25,950 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-06 21:52:25,950 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-06 21:52:25,950 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-06 21:52:25,950 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-06 21:52:25,950 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-06 21:52:25,951 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-06 21:52:25,951 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-06 21:52:25,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-06 21:52:25,951 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-06 21:52:25,951 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-06 21:52:25,951 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-06 21:52:25,952 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-06 21:52:25,952 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d53812dd1177b266d0f37d9b3339dda1620cf3a3734db2ec7312de8297126685 [2021-12-06 21:52:26,129 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-06 21:52:26,145 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-06 21:52:26,146 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-06 21:52:26,147 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-06 21:52:26,148 INFO L275 PluginConnector]: CDTParser initialized [2021-12-06 21:52:26,149 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/../../sv-benchmarks/c/array-examples/relax-2.i [2021-12-06 21:52:26,197 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/data/3ca346aa4/6ea1a0584c284f999dcec43754b45b1c/FLAG0fecf5c1a [2021-12-06 21:52:26,616 INFO L306 CDTParser]: Found 1 translation units. [2021-12-06 21:52:26,616 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/sv-benchmarks/c/array-examples/relax-2.i [2021-12-06 21:52:26,627 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/data/3ca346aa4/6ea1a0584c284f999dcec43754b45b1c/FLAG0fecf5c1a [2021-12-06 21:52:26,637 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/data/3ca346aa4/6ea1a0584c284f999dcec43754b45b1c [2021-12-06 21:52:26,639 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-06 21:52:26,640 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-06 21:52:26,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-06 21:52:26,641 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-06 21:52:26,644 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-06 21:52:26,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,645 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47c81da1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26, skipping insertion in model container [2021-12-06 21:52:26,645 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,650 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-06 21:52:26,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-06 21:52:26,809 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/sv-benchmarks/c/array-examples/relax-2.i[980,993] [2021-12-06 21:52:26,890 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-06 21:52:26,895 INFO L203 MainTranslator]: Completed pre-run [2021-12-06 21:52:26,904 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/sv-benchmarks/c/array-examples/relax-2.i[980,993] [2021-12-06 21:52:26,928 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-06 21:52:26,948 INFO L208 MainTranslator]: Completed translation [2021-12-06 21:52:26,948 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26 WrapperNode [2021-12-06 21:52:26,948 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-06 21:52:26,949 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-06 21:52:26,949 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-06 21:52:26,949 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-06 21:52:26,955 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,965 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,984 INFO L137 Inliner]: procedures = 120, calls = 26, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 135 [2021-12-06 21:52:26,984 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-06 21:52:26,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-06 21:52:26,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-06 21:52:26,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-06 21:52:26,991 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,991 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:26,994 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:27,000 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:27,004 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:27,006 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:27,008 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-06 21:52:27,009 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-06 21:52:27,009 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-06 21:52:27,009 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-06 21:52:27,010 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (1/1) ... [2021-12-06 21:52:27,016 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-06 21:52:27,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:27,038 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-06 21:52:27,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-06 21:52:27,068 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-06 21:52:27,068 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-06 21:52:27,069 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-06 21:52:27,069 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-06 21:52:27,069 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-06 21:52:27,069 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-06 21:52:27,069 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-06 21:52:27,069 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-06 21:52:27,069 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-06 21:52:27,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-06 21:52:27,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-06 21:52:27,147 INFO L236 CfgBuilder]: Building ICFG [2021-12-06 21:52:27,148 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-06 21:52:27,324 INFO L277 CfgBuilder]: Performing block encoding [2021-12-06 21:52:27,329 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-06 21:52:27,329 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-12-06 21:52:27,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 09:52:27 BoogieIcfgContainer [2021-12-06 21:52:27,330 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-06 21:52:27,332 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-06 21:52:27,332 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-06 21:52:27,334 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-06 21:52:27,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.12 09:52:26" (1/3) ... [2021-12-06 21:52:27,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45cce313 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.12 09:52:27, skipping insertion in model container [2021-12-06 21:52:27,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:52:26" (2/3) ... [2021-12-06 21:52:27,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45cce313 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.12 09:52:27, skipping insertion in model container [2021-12-06 21:52:27,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 09:52:27" (3/3) ... [2021-12-06 21:52:27,336 INFO L111 eAbstractionObserver]: Analyzing ICFG relax-2.i [2021-12-06 21:52:27,340 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-06 21:52:27,341 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-06 21:52:27,377 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-06 21:52:27,382 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-06 21:52:27,383 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-06 21:52:27,397 INFO L276 IsEmpty]: Start isEmpty. Operand has 51 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 44 states have internal predecessors, (67), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:27,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-12-06 21:52:27,401 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:27,401 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:27,402 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:27,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:27,406 INFO L85 PathProgramCache]: Analyzing trace with hash 229348008, now seen corresponding path program 1 times [2021-12-06 21:52:27,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:27,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999577598] [2021-12-06 21:52:27,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:27,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:27,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:27,581 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:27,581 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:27,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999577598] [2021-12-06 21:52:27,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999577598] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:27,582 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:52:27,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-06 21:52:27,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069278182] [2021-12-06 21:52:27,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:27,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-06 21:52:27,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:27,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-06 21:52:27,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-06 21:52:27,610 INFO L87 Difference]: Start difference. First operand has 51 states, 42 states have (on average 1.5952380952380953) internal successors, (67), 44 states have internal predecessors, (67), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:27,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:27,653 INFO L93 Difference]: Finished difference Result 110 states and 172 transitions. [2021-12-06 21:52:27,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-06 21:52:27,655 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-12-06 21:52:27,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:27,661 INFO L225 Difference]: With dead ends: 110 [2021-12-06 21:52:27,661 INFO L226 Difference]: Without dead ends: 55 [2021-12-06 21:52:27,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:52:27,666 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 13 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:27,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 200 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:27,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-12-06 21:52:27,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2021-12-06 21:52:27,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 41 states have (on average 1.3902439024390243) internal successors, (57), 42 states have internal predecessors, (57), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:27,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 66 transitions. [2021-12-06 21:52:27,697 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 66 transitions. Word has length 13 [2021-12-06 21:52:27,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:27,698 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 66 transitions. [2021-12-06 21:52:27,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:27,698 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 66 transitions. [2021-12-06 21:52:27,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-12-06 21:52:27,699 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:27,699 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:27,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-06 21:52:27,700 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:27,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:27,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1753731807, now seen corresponding path program 1 times [2021-12-06 21:52:27,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:27,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088200683] [2021-12-06 21:52:27,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:27,702 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:27,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:27,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:27,808 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:27,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088200683] [2021-12-06 21:52:27,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088200683] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:27,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:52:27,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-06 21:52:27,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639326854] [2021-12-06 21:52:27,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:27,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 21:52:27,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:27,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 21:52:27,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:52:27,811 INFO L87 Difference]: Start difference. First operand 49 states and 66 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:27,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:27,902 INFO L93 Difference]: Finished difference Result 105 states and 141 transitions. [2021-12-06 21:52:27,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-06 21:52:27,903 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-12-06 21:52:27,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:27,905 INFO L225 Difference]: With dead ends: 105 [2021-12-06 21:52:27,905 INFO L226 Difference]: Without dead ends: 69 [2021-12-06 21:52:27,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-06 21:52:27,907 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 50 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:27,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 265 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:52:27,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-06 21:52:27,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 65. [2021-12-06 21:52:27,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 57 states have (on average 1.4035087719298245) internal successors, (80), 58 states have internal predecessors, (80), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:27,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 89 transitions. [2021-12-06 21:52:27,917 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 89 transitions. Word has length 15 [2021-12-06 21:52:27,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:27,918 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 89 transitions. [2021-12-06 21:52:27,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:27,918 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 89 transitions. [2021-12-06 21:52:27,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-12-06 21:52:27,919 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:27,919 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:27,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-06 21:52:27,920 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:27,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:27,920 INFO L85 PathProgramCache]: Analyzing trace with hash 404200823, now seen corresponding path program 1 times [2021-12-06 21:52:27,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:27,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632844250] [2021-12-06 21:52:27,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:27,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:27,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:28,022 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:28,022 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:28,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632844250] [2021-12-06 21:52:28,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632844250] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:28,023 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:52:28,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:52:28,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919888304] [2021-12-06 21:52:28,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:28,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:52:28,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:28,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:52:28,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:52:28,025 INFO L87 Difference]: Start difference. First operand 65 states and 89 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:28,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:28,083 INFO L93 Difference]: Finished difference Result 81 states and 106 transitions. [2021-12-06 21:52:28,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-06 21:52:28,083 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-12-06 21:52:28,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:28,084 INFO L225 Difference]: With dead ends: 81 [2021-12-06 21:52:28,084 INFO L226 Difference]: Without dead ends: 64 [2021-12-06 21:52:28,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-12-06 21:52:28,086 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 34 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:28,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 169 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:28,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-12-06 21:52:28,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2021-12-06 21:52:28,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 55 states have internal predecessors, (72), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:28,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 81 transitions. [2021-12-06 21:52:28,093 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 81 transitions. Word has length 16 [2021-12-06 21:52:28,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:28,094 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 81 transitions. [2021-12-06 21:52:28,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:28,094 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 81 transitions. [2021-12-06 21:52:28,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-12-06 21:52:28,095 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:28,095 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:28,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-12-06 21:52:28,095 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:28,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:28,096 INFO L85 PathProgramCache]: Analyzing trace with hash -1831341089, now seen corresponding path program 1 times [2021-12-06 21:52:28,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:28,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879180128] [2021-12-06 21:52:28,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:28,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:28,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:28,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:28,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:28,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879180128] [2021-12-06 21:52:28,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879180128] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:28,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765531935] [2021-12-06 21:52:28,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:28,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:28,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:28,273 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:28,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-06 21:52:28,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:28,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-06 21:52:28,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:28,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:28,521 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:52:28,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765531935] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:28,521 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-06 21:52:28,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 12 [2021-12-06 21:52:28,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189742897] [2021-12-06 21:52:28,521 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:28,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 21:52:28,522 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:28,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 21:52:28,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-12-06 21:52:28,523 INFO L87 Difference]: Start difference. First operand 62 states and 81 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:28,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:28,609 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2021-12-06 21:52:28,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:52:28,610 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-12-06 21:52:28,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:28,611 INFO L225 Difference]: With dead ends: 71 [2021-12-06 21:52:28,611 INFO L226 Difference]: Without dead ends: 69 [2021-12-06 21:52:28,611 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-12-06 21:52:28,612 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 76 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:28,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 170 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:52:28,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-12-06 21:52:28,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-12-06 21:52:28,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.3157894736842106) internal successors, (75), 58 states have internal predecessors, (75), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:28,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 84 transitions. [2021-12-06 21:52:28,620 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 84 transitions. Word has length 17 [2021-12-06 21:52:28,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:28,620 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 84 transitions. [2021-12-06 21:52:28,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:28,621 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 84 transitions. [2021-12-06 21:52:28,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-06 21:52:28,621 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:28,621 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:28,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-06 21:52:28,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:28,823 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:28,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:28,825 INFO L85 PathProgramCache]: Analyzing trace with hash -251411362, now seen corresponding path program 1 times [2021-12-06 21:52:28,826 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:28,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637110450] [2021-12-06 21:52:28,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:28,827 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:28,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:28,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:28,941 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:28,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637110450] [2021-12-06 21:52:28,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637110450] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:28,943 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:52:28,943 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-06 21:52:28,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304132166] [2021-12-06 21:52:28,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:28,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-06 21:52:28,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:28,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-06 21:52:28,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-12-06 21:52:28,948 INFO L87 Difference]: Start difference. First operand 66 states and 84 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:28,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:28,984 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-12-06 21:52:28,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-06 21:52:28,984 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-06 21:52:28,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:28,985 INFO L225 Difference]: With dead ends: 78 [2021-12-06 21:52:28,985 INFO L226 Difference]: Without dead ends: 54 [2021-12-06 21:52:28,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:52:28,987 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 16 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:28,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 160 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:28,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-06 21:52:28,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-06 21:52:28,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3333333333333333) internal successors, (60), 46 states have internal predecessors, (60), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:28,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-12-06 21:52:28,995 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 18 [2021-12-06 21:52:28,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:28,995 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-12-06 21:52:28,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:28,995 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-12-06 21:52:28,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-12-06 21:52:28,996 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:28,996 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:28,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-12-06 21:52:28,996 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:28,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:28,997 INFO L85 PathProgramCache]: Analyzing trace with hash -2003533961, now seen corresponding path program 1 times [2021-12-06 21:52:28,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:28,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25178884] [2021-12-06 21:52:28,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:28,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:29,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:29,124 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:29,125 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:29,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25178884] [2021-12-06 21:52:29,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25178884] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:29,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033396037] [2021-12-06 21:52:29,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:29,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:29,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:29,126 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:29,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-06 21:52:29,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:29,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-06 21:52:29,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:29,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:29,232 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:52:29,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033396037] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:29,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-06 21:52:29,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [9] total 10 [2021-12-06 21:52:29,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550580579] [2021-12-06 21:52:29,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:29,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-06 21:52:29,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:29,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-06 21:52:29,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-12-06 21:52:29,234 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:29,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:29,281 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2021-12-06 21:52:29,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-06 21:52:29,282 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-12-06 21:52:29,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:29,283 INFO L225 Difference]: With dead ends: 68 [2021-12-06 21:52:29,283 INFO L226 Difference]: Without dead ends: 54 [2021-12-06 21:52:29,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-12-06 21:52:29,284 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 39 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:29,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 107 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:29,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-12-06 21:52:29,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-12-06 21:52:29,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.3111111111111111) internal successors, (59), 46 states have internal predecessors, (59), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:29,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 68 transitions. [2021-12-06 21:52:29,289 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 68 transitions. Word has length 18 [2021-12-06 21:52:29,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:29,290 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 68 transitions. [2021-12-06 21:52:29,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:29,290 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 68 transitions. [2021-12-06 21:52:29,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-12-06 21:52:29,290 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:29,291 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:29,311 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-06 21:52:29,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:29,491 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:29,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:29,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1225946208, now seen corresponding path program 1 times [2021-12-06 21:52:29,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:29,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664086431] [2021-12-06 21:52:29,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:29,493 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:29,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:29,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:29,531 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:29,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664086431] [2021-12-06 21:52:29,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664086431] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:29,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:52:29,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-12-06 21:52:29,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502909718] [2021-12-06 21:52:29,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:29,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-12-06 21:52:29,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:29,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-12-06 21:52:29,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-06 21:52:29,534 INFO L87 Difference]: Start difference. First operand 54 states and 68 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:29,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:29,561 INFO L93 Difference]: Finished difference Result 90 states and 118 transitions. [2021-12-06 21:52:29,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-06 21:52:29,562 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-12-06 21:52:29,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:29,564 INFO L225 Difference]: With dead ends: 90 [2021-12-06 21:52:29,564 INFO L226 Difference]: Without dead ends: 76 [2021-12-06 21:52:29,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-12-06 21:52:29,566 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 22 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 120 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 [2021-12-06 21:52:29,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 120 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:29,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-12-06 21:52:29,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2021-12-06 21:52:29,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 50 states have (on average 1.32) internal successors, (66), 51 states have internal predecessors, (66), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:29,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2021-12-06 21:52:29,581 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 20 [2021-12-06 21:52:29,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:29,581 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2021-12-06 21:52:29,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:29,582 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2021-12-06 21:52:29,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-12-06 21:52:29,583 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:29,583 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:29,584 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-12-06 21:52:29,584 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:29,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:29,585 INFO L85 PathProgramCache]: Analyzing trace with hash -1055739498, now seen corresponding path program 1 times [2021-12-06 21:52:29,585 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:29,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058007792] [2021-12-06 21:52:29,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:29,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:29,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:29,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:29,747 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:29,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058007792] [2021-12-06 21:52:29,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058007792] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:29,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557889941] [2021-12-06 21:52:29,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:29,748 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:29,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:29,749 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:29,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-06 21:52:29,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:29,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 12 conjunts are in the unsatisfiable core [2021-12-06 21:52:29,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:29,865 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:29,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:52:29,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557889941] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:29,866 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-06 21:52:29,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2021-12-06 21:52:29,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779134111] [2021-12-06 21:52:29,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:29,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 21:52:29,867 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:29,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 21:52:29,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-12-06 21:52:29,868 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:29,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:29,948 INFO L93 Difference]: Finished difference Result 121 states and 155 transitions. [2021-12-06 21:52:29,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:52:29,949 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-12-06 21:52:29,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:29,950 INFO L225 Difference]: With dead ends: 121 [2021-12-06 21:52:29,950 INFO L226 Difference]: Without dead ends: 61 [2021-12-06 21:52:29,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-12-06 21:52:29,952 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 31 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:29,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 270 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:29,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-12-06 21:52:29,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-12-06 21:52:29,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 52 states have internal predecessors, (67), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:29,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2021-12-06 21:52:29,960 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 24 [2021-12-06 21:52:29,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:29,960 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2021-12-06 21:52:29,961 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.8333333333333335) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:29,961 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2021-12-06 21:52:29,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-06 21:52:29,962 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:29,962 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:29,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-12-06 21:52:30,162 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-12-06 21:52:30,163 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:30,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:30,164 INFO L85 PathProgramCache]: Analyzing trace with hash -458147624, now seen corresponding path program 1 times [2021-12-06 21:52:30,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:30,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672824392] [2021-12-06 21:52:30,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:30,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:30,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:30,228 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:30,228 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:30,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672824392] [2021-12-06 21:52:30,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1672824392] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:30,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059200928] [2021-12-06 21:52:30,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:30,229 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:30,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:30,229 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:30,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-06 21:52:30,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:30,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-06 21:52:30,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:30,405 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:30,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:30,558 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:30,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059200928] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:30,559 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:30,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 10] total 15 [2021-12-06 21:52:30,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081329322] [2021-12-06 21:52:30,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:30,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-06 21:52:30,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:30,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-06 21:52:30,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-12-06 21:52:30,560 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:30,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:30,729 INFO L93 Difference]: Finished difference Result 145 states and 193 transitions. [2021-12-06 21:52:30,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-06 21:52:30,730 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-06 21:52:30,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:30,730 INFO L225 Difference]: With dead ends: 145 [2021-12-06 21:52:30,731 INFO L226 Difference]: Without dead ends: 122 [2021-12-06 21:52:30,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-12-06 21:52:30,732 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 236 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:30,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 568 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:52:30,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-12-06 21:52:30,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 90. [2021-12-06 21:52:30,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 80 states have (on average 1.325) internal successors, (106), 81 states have internal predecessors, (106), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:30,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 117 transitions. [2021-12-06 21:52:30,744 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 117 transitions. Word has length 26 [2021-12-06 21:52:30,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:30,744 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 117 transitions. [2021-12-06 21:52:30,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:30,745 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 117 transitions. [2021-12-06 21:52:30,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-12-06 21:52:30,746 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:30,746 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:30,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-06 21:52:30,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:30,947 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:30,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:30,947 INFO L85 PathProgramCache]: Analyzing trace with hash -456300582, now seen corresponding path program 1 times [2021-12-06 21:52:30,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:30,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485751058] [2021-12-06 21:52:30,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:30,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:30,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:31,032 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:31,033 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:31,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485751058] [2021-12-06 21:52:31,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485751058] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:31,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452807318] [2021-12-06 21:52:31,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:31,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:31,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:31,034 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:31,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-06 21:52:31,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:31,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-06 21:52:31,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:31,131 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-06 21:52:31,131 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:52:31,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452807318] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:31,132 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-06 21:52:31,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [7] total 9 [2021-12-06 21:52:31,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735129139] [2021-12-06 21:52:31,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:31,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-06 21:52:31,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:31,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-06 21:52:31,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-12-06 21:52:31,133 INFO L87 Difference]: Start difference. First operand 90 states and 117 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:31,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:31,188 INFO L93 Difference]: Finished difference Result 124 states and 161 transitions. [2021-12-06 21:52:31,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-06 21:52:31,188 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-12-06 21:52:31,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:31,189 INFO L225 Difference]: With dead ends: 124 [2021-12-06 21:52:31,189 INFO L226 Difference]: Without dead ends: 110 [2021-12-06 21:52:31,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-12-06 21:52:31,190 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 55 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:31,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 134 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:31,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-12-06 21:52:31,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2021-12-06 21:52:31,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 86 states have (on average 1.313953488372093) internal successors, (113), 87 states have internal predecessors, (113), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:31,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 124 transitions. [2021-12-06 21:52:31,199 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 124 transitions. Word has length 26 [2021-12-06 21:52:31,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:31,199 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 124 transitions. [2021-12-06 21:52:31,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:31,199 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 124 transitions. [2021-12-06 21:52:31,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-12-06 21:52:31,200 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:31,200 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:31,221 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-06 21:52:31,401 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-06 21:52:31,401 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:31,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:31,402 INFO L85 PathProgramCache]: Analyzing trace with hash -993450261, now seen corresponding path program 1 times [2021-12-06 21:52:31,402 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:31,402 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196583462] [2021-12-06 21:52:31,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:31,403 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:31,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:31,579 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-06 21:52:31,579 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:31,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196583462] [2021-12-06 21:52:31,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196583462] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:31,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908484429] [2021-12-06 21:52:31,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:31,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:31,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:31,581 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:31,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-06 21:52:31,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:31,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-06 21:52:31,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:31,704 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:31,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:31,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:31,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908484429] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:31,784 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:31,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8] total 18 [2021-12-06 21:52:31,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570797183] [2021-12-06 21:52:31,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:31,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-06 21:52:31,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:31,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-06 21:52:31,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-12-06 21:52:31,786 INFO L87 Difference]: Start difference. First operand 96 states and 124 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:32,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:32,107 INFO L93 Difference]: Finished difference Result 266 states and 357 transitions. [2021-12-06 21:52:32,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-06 21:52:32,107 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-12-06 21:52:32,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:32,109 INFO L225 Difference]: With dead ends: 266 [2021-12-06 21:52:32,109 INFO L226 Difference]: Without dead ends: 189 [2021-12-06 21:52:32,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-12-06 21:52:32,111 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 374 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 334 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 334 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:32,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [378 Valid, 603 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 334 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-06 21:52:32,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-12-06 21:52:32,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 119. [2021-12-06 21:52:32,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 109 states have (on average 1.3027522935779816) internal successors, (142), 110 states have internal predecessors, (142), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:32,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 153 transitions. [2021-12-06 21:52:32,125 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 153 transitions. Word has length 27 [2021-12-06 21:52:32,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:32,125 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 153 transitions. [2021-12-06 21:52:32,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 18 states have internal predecessors, (57), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:32,126 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 153 transitions. [2021-12-06 21:52:32,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-06 21:52:32,127 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:32,127 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:52:32,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-12-06 21:52:32,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-06 21:52:32,328 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:32,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:32,328 INFO L85 PathProgramCache]: Analyzing trace with hash 1669286615, now seen corresponding path program 1 times [2021-12-06 21:52:32,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:32,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282242594] [2021-12-06 21:52:32,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:32,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:32,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:32,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-12-06 21:52:32,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:32,389 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-06 21:52:32,389 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:32,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282242594] [2021-12-06 21:52:32,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282242594] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:52:32,389 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:52:32,389 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-06 21:52:32,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670372182] [2021-12-06 21:52:32,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:32,390 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-06 21:52:32,390 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:32,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-06 21:52:32,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-06 21:52:32,391 INFO L87 Difference]: Start difference. First operand 119 states and 153 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-06 21:52:32,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:32,425 INFO L93 Difference]: Finished difference Result 149 states and 191 transitions. [2021-12-06 21:52:32,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-06 21:52:32,425 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-12-06 21:52:32,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:32,427 INFO L225 Difference]: With dead ends: 149 [2021-12-06 21:52:32,427 INFO L226 Difference]: Without dead ends: 128 [2021-12-06 21:52:32,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-06 21:52:32,428 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 5 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:32,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 165 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:52:32,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-12-06 21:52:32,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 122. [2021-12-06 21:52:32,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 112 states have (on average 1.3035714285714286) internal successors, (146), 113 states have internal predecessors, (146), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:32,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 157 transitions. [2021-12-06 21:52:32,441 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 157 transitions. Word has length 31 [2021-12-06 21:52:32,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:32,441 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 157 transitions. [2021-12-06 21:52:32,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-12-06 21:52:32,441 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 157 transitions. [2021-12-06 21:52:32,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-06 21:52:32,442 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:32,442 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:32,442 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-12-06 21:52:32,443 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:32,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:32,443 INFO L85 PathProgramCache]: Analyzing trace with hash 1241240931, now seen corresponding path program 1 times [2021-12-06 21:52:32,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:32,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331504609] [2021-12-06 21:52:32,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:32,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:32,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:32,496 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-06 21:52:32,497 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:32,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331504609] [2021-12-06 21:52:32,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331504609] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:32,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029323201] [2021-12-06 21:52:32,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:32,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:32,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:32,498 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:32,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-06 21:52:32,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:32,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 18 conjunts are in the unsatisfiable core [2021-12-06 21:52:32,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:32,723 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:32,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:32,807 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-06 21:52:32,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029323201] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:32,807 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:32,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 7] total 20 [2021-12-06 21:52:32,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250071997] [2021-12-06 21:52:32,808 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:32,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-06 21:52:32,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:32,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-06 21:52:32,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-12-06 21:52:32,809 INFO L87 Difference]: Start difference. First operand 122 states and 157 transitions. Second operand has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:33,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:33,580 INFO L93 Difference]: Finished difference Result 359 states and 499 transitions. [2021-12-06 21:52:33,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-12-06 21:52:33,581 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-06 21:52:33,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:33,583 INFO L225 Difference]: With dead ends: 359 [2021-12-06 21:52:33,583 INFO L226 Difference]: Without dead ends: 329 [2021-12-06 21:52:33,584 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=322, Invalid=1658, Unknown=0, NotChecked=0, Total=1980 [2021-12-06 21:52:33,584 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 559 mSDsluCounter, 1096 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 559 SdHoareTripleChecker+Valid, 1215 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:33,584 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [559 Valid, 1215 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 618 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-06 21:52:33,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-12-06 21:52:33,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 164. [2021-12-06 21:52:33,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 154 states have (on average 1.3506493506493507) internal successors, (208), 155 states have internal predecessors, (208), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:33,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 219 transitions. [2021-12-06 21:52:33,597 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 219 transitions. Word has length 31 [2021-12-06 21:52:33,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:33,598 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 219 transitions. [2021-12-06 21:52:33,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 18 states have internal predecessors, (62), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:33,598 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 219 transitions. [2021-12-06 21:52:33,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-12-06 21:52:33,598 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:33,598 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:33,622 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-06 21:52:33,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:33,800 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:33,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:33,801 INFO L85 PathProgramCache]: Analyzing trace with hash 431894305, now seen corresponding path program 1 times [2021-12-06 21:52:33,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:33,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558192015] [2021-12-06 21:52:33,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:33,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:33,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:34,044 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:52:34,044 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:34,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558192015] [2021-12-06 21:52:34,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558192015] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:34,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150321672] [2021-12-06 21:52:34,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:34,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:34,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:34,046 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:34,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-06 21:52:34,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:34,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 56 conjunts are in the unsatisfiable core [2021-12-06 21:52:34,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:34,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-06 21:52:34,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:52:34,307 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:52:34,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:52:34,312 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-06 21:52:34,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 75 treesize of output 38 [2021-12-06 21:52:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:34,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:34,503 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:52:34,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150321672] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:34,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:52:34,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [11, 13] total 27 [2021-12-06 21:52:34,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097736261] [2021-12-06 21:52:34,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:52:34,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-12-06 21:52:34,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:34,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-12-06 21:52:34,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-12-06 21:52:34,504 INFO L87 Difference]: Start difference. First operand 164 states and 219 transitions. Second operand has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:34,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:34,830 INFO L93 Difference]: Finished difference Result 327 states and 448 transitions. [2021-12-06 21:52:34,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-06 21:52:34,830 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-12-06 21:52:34,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:34,832 INFO L225 Difference]: With dead ends: 327 [2021-12-06 21:52:34,832 INFO L226 Difference]: Without dead ends: 318 [2021-12-06 21:52:34,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=168, Invalid=954, Unknown=0, NotChecked=0, Total=1122 [2021-12-06 21:52:34,833 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 188 mSDsluCounter, 485 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:34,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 575 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-06 21:52:34,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-12-06 21:52:34,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 207. [2021-12-06 21:52:34,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 197 states have (on average 1.3756345177664975) internal successors, (271), 198 states have internal predecessors, (271), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:34,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 282 transitions. [2021-12-06 21:52:34,852 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 282 transitions. Word has length 31 [2021-12-06 21:52:34,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:34,852 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 282 transitions. [2021-12-06 21:52:34,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 11 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:34,852 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 282 transitions. [2021-12-06 21:52:34,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-12-06 21:52:34,853 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:34,853 INFO L514 BasicCegarLoop]: 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] [2021-12-06 21:52:34,872 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-12-06 21:52:35,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:35,055 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:35,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:35,056 INFO L85 PathProgramCache]: Analyzing trace with hash 1856637752, now seen corresponding path program 1 times [2021-12-06 21:52:35,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:35,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330306018] [2021-12-06 21:52:35,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:35,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:35,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:35,337 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:35,338 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:35,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330306018] [2021-12-06 21:52:35,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330306018] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:35,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865580997] [2021-12-06 21:52:35,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:35,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:35,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:35,339 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:35,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-06 21:52:35,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:35,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-06 21:52:35,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:35,476 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:52:35,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:35,573 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:52:35,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865580997] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:35,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:35,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8, 8] total 24 [2021-12-06 21:52:35,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443444895] [2021-12-06 21:52:35,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:35,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-06 21:52:35,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:35,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-06 21:52:35,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=481, Unknown=0, NotChecked=0, Total=552 [2021-12-06 21:52:35,576 INFO L87 Difference]: Start difference. First operand 207 states and 282 transitions. Second operand has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:37,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:37,822 INFO L93 Difference]: Finished difference Result 848 states and 1180 transitions. [2021-12-06 21:52:37,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-12-06 21:52:37,823 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-12-06 21:52:37,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:37,827 INFO L225 Difference]: With dead ends: 848 [2021-12-06 21:52:37,827 INFO L226 Difference]: Without dead ends: 767 [2021-12-06 21:52:37,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 968 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=535, Invalid=3371, Unknown=0, NotChecked=0, Total=3906 [2021-12-06 21:52:37,828 INFO L933 BasicCegarLoop]: 225 mSDtfsCounter, 1357 mSDsluCounter, 2509 mSDsCounter, 0 mSdLazyCounter, 1793 mSolverCounterSat, 370 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1361 SdHoareTripleChecker+Valid, 2734 SdHoareTripleChecker+Invalid, 2163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 370 IncrementalHoareTripleChecker+Valid, 1793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:37,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1361 Valid, 2734 Invalid, 2163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [370 Valid, 1793 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-12-06 21:52:37,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-12-06 21:52:37,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 168. [2021-12-06 21:52:37,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 158 states have (on average 1.3354430379746836) internal successors, (211), 159 states have internal predecessors, (211), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:37,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 222 transitions. [2021-12-06 21:52:37,854 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 222 transitions. Word has length 32 [2021-12-06 21:52:37,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:37,854 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 222 transitions. [2021-12-06 21:52:37,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:37,855 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 222 transitions. [2021-12-06 21:52:37,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-06 21:52:37,855 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:37,855 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:52:37,875 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-12-06 21:52:38,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:38,057 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:38,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:38,058 INFO L85 PathProgramCache]: Analyzing trace with hash -337481851, now seen corresponding path program 1 times [2021-12-06 21:52:38,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:38,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084510382] [2021-12-06 21:52:38,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:38,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:38,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:38,427 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 21:52:38,427 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:38,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084510382] [2021-12-06 21:52:38,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084510382] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:38,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820513279] [2021-12-06 21:52:38,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:38,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:38,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:38,428 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:38,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-06 21:52:38,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:38,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-06 21:52:38,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:38,718 INFO L354 Elim1Store]: treesize reduction 3, result has 78.6 percent of original size [2021-12-06 21:52:38,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 22 [2021-12-06 21:52:38,733 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-06 21:52:38,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:38,924 INFO L354 Elim1Store]: treesize reduction 23, result has 78.3 percent of original size [2021-12-06 21:52:38,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:52:39,378 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-06 21:52:39,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820513279] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:39,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:39,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 12] total 38 [2021-12-06 21:52:39,379 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134731373] [2021-12-06 21:52:39,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:39,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-06 21:52:39,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:39,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-06 21:52:39,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1225, Unknown=0, NotChecked=0, Total=1406 [2021-12-06 21:52:39,380 INFO L87 Difference]: Start difference. First operand 168 states and 222 transitions. Second operand has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:40,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:40,246 INFO L93 Difference]: Finished difference Result 425 states and 573 transitions. [2021-12-06 21:52:40,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-06 21:52:40,246 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-12-06 21:52:40,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:40,248 INFO L225 Difference]: With dead ends: 425 [2021-12-06 21:52:40,248 INFO L226 Difference]: Without dead ends: 331 [2021-12-06 21:52:40,249 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=348, Invalid=2102, Unknown=0, NotChecked=0, Total=2450 [2021-12-06 21:52:40,250 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 437 mSDsluCounter, 1316 mSDsCounter, 0 mSdLazyCounter, 1107 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 449 SdHoareTripleChecker+Valid, 1422 SdHoareTripleChecker+Invalid, 1199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 1107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:40,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [449 Valid, 1422 Invalid, 1199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 1107 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-06 21:52:40,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-12-06 21:52:40,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 180. [2021-12-06 21:52:40,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.3294117647058823) internal successors, (226), 171 states have internal predecessors, (226), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:40,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 237 transitions. [2021-12-06 21:52:40,271 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 237 transitions. Word has length 37 [2021-12-06 21:52:40,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:40,271 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 237 transitions. [2021-12-06 21:52:40,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 38 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:40,272 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 237 transitions. [2021-12-06 21:52:40,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-12-06 21:52:40,272 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:40,272 INFO L514 BasicCegarLoop]: 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] [2021-12-06 21:52:40,292 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-12-06 21:52:40,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-06 21:52:40,474 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:40,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:40,475 INFO L85 PathProgramCache]: Analyzing trace with hash 363582727, now seen corresponding path program 1 times [2021-12-06 21:52:40,476 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:40,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198892030] [2021-12-06 21:52:40,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:40,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:40,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:40,873 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-06 21:52:40,873 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:40,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198892030] [2021-12-06 21:52:40,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198892030] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:40,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474757065] [2021-12-06 21:52:40,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:40,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:40,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:40,875 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:40,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-06 21:52:40,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:40,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-06 21:52:40,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:41,063 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:52:41,063 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:52:41,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:52:41,070 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-12-06 21:52:41,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 75 treesize of output 38 [2021-12-06 21:52:41,087 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-12-06 21:52:41,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:41,225 INFO L354 Elim1Store]: treesize reduction 20, result has 80.0 percent of original size [2021-12-06 21:52:41,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:52:41,414 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-06 21:52:41,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474757065] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:41,415 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:41,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 25 [2021-12-06 21:52:41,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763716550] [2021-12-06 21:52:41,415 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:41,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-06 21:52:41,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:41,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-06 21:52:41,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-12-06 21:52:41,416 INFO L87 Difference]: Start difference. First operand 180 states and 237 transitions. Second operand has 25 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:41,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:41,704 INFO L93 Difference]: Finished difference Result 312 states and 417 transitions. [2021-12-06 21:52:41,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-06 21:52:41,705 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-12-06 21:52:41,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:41,706 INFO L225 Difference]: With dead ends: 312 [2021-12-06 21:52:41,706 INFO L226 Difference]: Without dead ends: 264 [2021-12-06 21:52:41,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 62 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=133, Invalid=569, Unknown=0, NotChecked=0, Total=702 [2021-12-06 21:52:41,707 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 162 mSDsluCounter, 706 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 787 SdHoareTripleChecker+Invalid, 403 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:41,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 787 Invalid, 403 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-06 21:52:41,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2021-12-06 21:52:41,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 171. [2021-12-06 21:52:41,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 161 states have (on average 1.31055900621118) internal successors, (211), 162 states have internal predecessors, (211), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:41,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 222 transitions. [2021-12-06 21:52:41,726 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 222 transitions. Word has length 37 [2021-12-06 21:52:41,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:41,726 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 222 transitions. [2021-12-06 21:52:41,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:41,727 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 222 transitions. [2021-12-06 21:52:41,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-06 21:52:41,727 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:41,727 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:52:41,747 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-06 21:52:41,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-06 21:52:41,928 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:41,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:41,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1398313997, now seen corresponding path program 1 times [2021-12-06 21:52:41,930 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:41,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41271921] [2021-12-06 21:52:41,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:41,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:41,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:42,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-12-06 21:52:42,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:42,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-06 21:52:42,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:42,064 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-06 21:52:42,064 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:42,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41271921] [2021-12-06 21:52:42,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41271921] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:42,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021976836] [2021-12-06 21:52:42,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:42,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:42,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:42,066 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:42,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-06 21:52:42,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:42,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-06 21:52:42,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:42,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:42,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:42,271 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:42,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021976836] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:42,272 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:42,272 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-12-06 21:52:42,272 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679630013] [2021-12-06 21:52:42,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:42,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-06 21:52:42,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:42,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-06 21:52:42,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-12-06 21:52:42,273 INFO L87 Difference]: Start difference. First operand 171 states and 222 transitions. Second operand has 16 states, 16 states have (on average 4.3125) internal successors, (69), 16 states have internal predecessors, (69), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:42,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:42,479 INFO L93 Difference]: Finished difference Result 220 states and 284 transitions. [2021-12-06 21:52:42,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-06 21:52:42,479 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 16 states have internal predecessors, (69), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 40 [2021-12-06 21:52:42,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:42,480 INFO L225 Difference]: With dead ends: 220 [2021-12-06 21:52:42,480 INFO L226 Difference]: Without dead ends: 170 [2021-12-06 21:52:42,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=388, Unknown=0, NotChecked=0, Total=506 [2021-12-06 21:52:42,481 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 105 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:42,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 460 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:52:42,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-12-06 21:52:42,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 159. [2021-12-06 21:52:42,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 149 states have (on average 1.3154362416107384) internal successors, (196), 150 states have internal predecessors, (196), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:42,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 207 transitions. [2021-12-06 21:52:42,502 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 207 transitions. Word has length 40 [2021-12-06 21:52:42,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:42,502 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 207 transitions. [2021-12-06 21:52:42,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 4.3125) internal successors, (69), 16 states have internal predecessors, (69), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-12-06 21:52:42,502 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 207 transitions. [2021-12-06 21:52:42,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-12-06 21:52:42,503 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:42,503 INFO L514 BasicCegarLoop]: 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] [2021-12-06 21:52:42,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-06 21:52:42,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-06 21:52:42,704 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:42,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:42,704 INFO L85 PathProgramCache]: Analyzing trace with hash -1574291585, now seen corresponding path program 1 times [2021-12-06 21:52:42,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:42,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436319545] [2021-12-06 21:52:42,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:42,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:42,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:42,815 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-06 21:52:42,815 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:42,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436319545] [2021-12-06 21:52:42,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436319545] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:42,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85525833] [2021-12-06 21:52:42,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:42,816 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:42,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:42,817 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:42,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-06 21:52:42,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:42,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 52 conjunts are in the unsatisfiable core [2021-12-06 21:52:42,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:43,090 INFO L354 Elim1Store]: treesize reduction 99, result has 27.2 percent of original size [2021-12-06 21:52:43,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 82 treesize of output 71 [2021-12-06 21:52:43,123 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-06 21:52:43,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:43,387 INFO L354 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-06 21:52:43,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:52:43,687 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-06 21:52:43,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85525833] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:43,687 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:43,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 14] total 29 [2021-12-06 21:52:43,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482788450] [2021-12-06 21:52:43,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:43,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-06 21:52:43,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:43,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-06 21:52:43,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=736, Unknown=0, NotChecked=0, Total=812 [2021-12-06 21:52:43,689 INFO L87 Difference]: Start difference. First operand 159 states and 207 transitions. Second operand has 29 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:46,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:46,527 INFO L93 Difference]: Finished difference Result 894 states and 1238 transitions. [2021-12-06 21:52:46,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-12-06 21:52:46,527 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-12-06 21:52:46,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:46,531 INFO L225 Difference]: With dead ends: 894 [2021-12-06 21:52:46,531 INFO L226 Difference]: Without dead ends: 769 [2021-12-06 21:52:46,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=528, Invalid=3504, Unknown=0, NotChecked=0, Total=4032 [2021-12-06 21:52:46,533 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 1236 mSDsluCounter, 2806 mSDsCounter, 0 mSdLazyCounter, 2453 mSolverCounterSat, 431 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1248 SdHoareTripleChecker+Valid, 3008 SdHoareTripleChecker+Invalid, 2884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 431 IncrementalHoareTripleChecker+Valid, 2453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:46,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1248 Valid, 3008 Invalid, 2884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [431 Valid, 2453 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-12-06 21:52:46,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-12-06 21:52:46,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 270. [2021-12-06 21:52:46,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 259 states have (on average 1.3281853281853282) internal successors, (344), 260 states have internal predecessors, (344), 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) [2021-12-06 21:52:46,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 357 transitions. [2021-12-06 21:52:46,575 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 357 transitions. Word has length 39 [2021-12-06 21:52:46,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:46,575 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 357 transitions. [2021-12-06 21:52:46,575 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 28 states have internal predecessors, (85), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:46,575 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 357 transitions. [2021-12-06 21:52:46,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-12-06 21:52:46,576 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:46,576 INFO L514 BasicCegarLoop]: trace histogram [3, 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] [2021-12-06 21:52:46,595 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-12-06 21:52:46,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:46,777 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:46,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:46,778 INFO L85 PathProgramCache]: Analyzing trace with hash 916341538, now seen corresponding path program 1 times [2021-12-06 21:52:46,779 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:46,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114687007] [2021-12-06 21:52:46,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:46,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:46,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:46,971 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:52:46,971 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:46,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114687007] [2021-12-06 21:52:46,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2114687007] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:46,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411958061] [2021-12-06 21:52:46,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:46,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:46,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:46,972 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:46,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-06 21:52:47,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:47,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-06 21:52:47,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:47,280 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:52:47,280 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:47,643 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:52:47,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411958061] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:47,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:47,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 10] total 23 [2021-12-06 21:52:47,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378797089] [2021-12-06 21:52:47,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:47,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-06 21:52:47,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:47,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-06 21:52:47,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=437, Unknown=0, NotChecked=0, Total=506 [2021-12-06 21:52:47,645 INFO L87 Difference]: Start difference. First operand 270 states and 357 transitions. Second operand has 23 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:48,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:48,876 INFO L93 Difference]: Finished difference Result 726 states and 974 transitions. [2021-12-06 21:52:48,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-06 21:52:48,877 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-12-06 21:52:48,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:48,880 INFO L225 Difference]: With dead ends: 726 [2021-12-06 21:52:48,880 INFO L226 Difference]: Without dead ends: 528 [2021-12-06 21:52:48,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 62 SyntacticMatches, 10 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=207, Invalid=983, Unknown=0, NotChecked=0, Total=1190 [2021-12-06 21:52:48,882 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 721 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 721 SdHoareTripleChecker+Valid, 1289 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:48,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [721 Valid, 1289 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 599 Invalid, 0 Unknown, 58 Unchecked, 0.7s Time] [2021-12-06 21:52:48,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-12-06 21:52:48,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 302. [2021-12-06 21:52:48,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 291 states have (on average 1.3402061855670102) internal successors, (390), 292 states have internal predecessors, (390), 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) [2021-12-06 21:52:48,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 403 transitions. [2021-12-06 21:52:48,935 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 403 transitions. Word has length 40 [2021-12-06 21:52:48,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:48,935 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 403 transitions. [2021-12-06 21:52:48,935 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.6956521739130435) internal successors, (62), 23 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:52:48,935 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 403 transitions. [2021-12-06 21:52:48,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-06 21:52:48,936 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:48,936 INFO L514 BasicCegarLoop]: 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, 1] [2021-12-06 21:52:48,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-06 21:52:49,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:49,137 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:49,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:49,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1152781740, now seen corresponding path program 1 times [2021-12-06 21:52:49,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:49,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251287921] [2021-12-06 21:52:49,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:49,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:49,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:49,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-06 21:52:49,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:49,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-12-06 21:52:49,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:49,277 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 21:52:49,278 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:49,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251287921] [2021-12-06 21:52:49,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251287921] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:49,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872621474] [2021-12-06 21:52:49,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:49,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:49,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:49,279 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:49,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-06 21:52:49,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:49,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-06 21:52:49,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:49,439 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:52:49,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:49,552 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 21:52:49,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872621474] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:49,552 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:49,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 7] total 15 [2021-12-06 21:52:49,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138860690] [2021-12-06 21:52:49,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:49,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-12-06 21:52:49,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:49,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-12-06 21:52:49,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-12-06 21:52:49,553 INFO L87 Difference]: Start difference. First operand 302 states and 403 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:49,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:52:49,810 INFO L93 Difference]: Finished difference Result 373 states and 491 transitions. [2021-12-06 21:52:49,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-12-06 21:52:49,810 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 43 [2021-12-06 21:52:49,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:52:49,812 INFO L225 Difference]: With dead ends: 373 [2021-12-06 21:52:49,812 INFO L226 Difference]: Without dead ends: 329 [2021-12-06 21:52:49,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=296, Unknown=0, NotChecked=0, Total=380 [2021-12-06 21:52:49,813 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 63 mSDsluCounter, 455 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 506 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:52:49,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 506 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:52:49,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2021-12-06 21:52:49,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 305. [2021-12-06 21:52:49,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 294 states have (on average 1.3299319727891157) internal successors, (391), 295 states have internal predecessors, (391), 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) [2021-12-06 21:52:49,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 404 transitions. [2021-12-06 21:52:49,854 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 404 transitions. Word has length 43 [2021-12-06 21:52:49,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:52:49,854 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 404 transitions. [2021-12-06 21:52:49,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:52:49,854 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 404 transitions. [2021-12-06 21:52:49,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-12-06 21:52:49,855 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:52:49,855 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:52:49,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-06 21:52:50,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:50,056 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:52:50,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:52:50,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1493374564, now seen corresponding path program 2 times [2021-12-06 21:52:50,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:52:50,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378253507] [2021-12-06 21:52:50,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:52:50,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:52:50,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:52:50,427 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:52:50,427 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:52:50,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378253507] [2021-12-06 21:52:50,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [378253507] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:52:50,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987718596] [2021-12-06 21:52:50,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:52:50,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:52:50,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:52:50,428 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:52:50,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-06 21:52:50,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:52:50,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:52:50,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-06 21:52:50,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:52:50,641 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-06 21:52:50,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:52:50,809 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-12-06 21:52:50,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987718596] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:52:50,809 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:52:50,809 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10, 10] total 32 [2021-12-06 21:52:50,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741156510] [2021-12-06 21:52:50,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:52:50,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-12-06 21:52:50,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:52:50,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-12-06 21:52:50,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2021-12-06 21:52:50,811 INFO L87 Difference]: Start difference. First operand 305 states and 404 transitions. Second operand has 32 states, 32 states have (on average 2.625) internal successors, (84), 32 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:03,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:03,779 INFO L93 Difference]: Finished difference Result 2242 states and 3045 transitions. [2021-12-06 21:53:03,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-12-06 21:53:03,780 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.625) internal successors, (84), 32 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-12-06 21:53:03,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:03,788 INFO L225 Difference]: With dead ends: 2242 [2021-12-06 21:53:03,788 INFO L226 Difference]: Without dead ends: 2145 [2021-12-06 21:53:03,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6792 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=2308, Invalid=18572, Unknown=0, NotChecked=0, Total=20880 [2021-12-06 21:53:03,794 INFO L933 BasicCegarLoop]: 423 mSDtfsCounter, 3747 mSDsluCounter, 5145 mSDsCounter, 0 mSdLazyCounter, 4157 mSolverCounterSat, 1015 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3751 SdHoareTripleChecker+Valid, 5568 SdHoareTripleChecker+Invalid, 5172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1015 IncrementalHoareTripleChecker+Valid, 4157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:03,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3751 Valid, 5568 Invalid, 5172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1015 Valid, 4157 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2021-12-06 21:53:03,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2145 states. [2021-12-06 21:53:03,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2145 to 256. [2021-12-06 21:53:03,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 245 states have (on average 1.310204081632653) internal successors, (321), 246 states have internal predecessors, (321), 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) [2021-12-06 21:53:03,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 334 transitions. [2021-12-06 21:53:03,858 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 334 transitions. Word has length 42 [2021-12-06 21:53:03,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:03,858 INFO L470 AbstractCegarLoop]: Abstraction has 256 states and 334 transitions. [2021-12-06 21:53:03,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.625) internal successors, (84), 32 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:03,858 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 334 transitions. [2021-12-06 21:53:03,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-06 21:53:03,859 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:03,859 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 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] [2021-12-06 21:53:03,892 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-06 21:53:04,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:04,059 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:04,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:04,060 INFO L85 PathProgramCache]: Analyzing trace with hash 841725603, now seen corresponding path program 2 times [2021-12-06 21:53:04,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:04,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076758103] [2021-12-06 21:53:04,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:04,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:04,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:04,140 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-06 21:53:04,141 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:04,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076758103] [2021-12-06 21:53:04,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076758103] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:04,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835712344] [2021-12-06 21:53:04,141 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:53:04,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:04,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:04,142 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:04,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-06 21:53:04,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:53:04,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:04,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-06 21:53:04,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:04,300 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-12-06 21:53:04,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:04,397 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-06 21:53:04,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835712344] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:04,397 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:04,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 7] total 21 [2021-12-06 21:53:04,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170096968] [2021-12-06 21:53:04,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:04,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-06 21:53:04,398 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:04,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-06 21:53:04,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2021-12-06 21:53:04,398 INFO L87 Difference]: Start difference. First operand 256 states and 334 transitions. Second operand has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:04,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:04,704 INFO L93 Difference]: Finished difference Result 327 states and 427 transitions. [2021-12-06 21:53:04,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-12-06 21:53:04,705 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-12-06 21:53:04,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:04,706 INFO L225 Difference]: With dead ends: 327 [2021-12-06 21:53:04,706 INFO L226 Difference]: Without dead ends: 277 [2021-12-06 21:53:04,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=566, Unknown=0, NotChecked=0, Total=650 [2021-12-06 21:53:04,707 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 55 mSDsluCounter, 1149 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 1228 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:04,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 1228 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-06 21:53:04,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-12-06 21:53:04,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 266. [2021-12-06 21:53:04,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 255 states have (on average 1.3137254901960784) internal successors, (335), 256 states have internal predecessors, (335), 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) [2021-12-06 21:53:04,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 348 transitions. [2021-12-06 21:53:04,755 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 348 transitions. Word has length 43 [2021-12-06 21:53:04,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:04,755 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 348 transitions. [2021-12-06 21:53:04,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.9) internal successors, (78), 20 states have internal predecessors, (78), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:04,755 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 348 transitions. [2021-12-06 21:53:04,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-12-06 21:53:04,756 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:04,756 INFO L514 BasicCegarLoop]: 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] [2021-12-06 21:53:04,775 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-12-06 21:53:04,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-06 21:53:04,957 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:04,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:04,958 INFO L85 PathProgramCache]: Analyzing trace with hash -2028075032, now seen corresponding path program 1 times [2021-12-06 21:53:04,959 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:04,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219473433] [2021-12-06 21:53:04,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:04,960 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:05,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:05,188 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-12-06 21:53:05,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:05,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-12-06 21:53:05,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:05,193 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-06 21:53:05,193 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:05,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219473433] [2021-12-06 21:53:05,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219473433] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:05,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741476407] [2021-12-06 21:53:05,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:05,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:05,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:05,195 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:05,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-06 21:53:05,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:05,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-06 21:53:05,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:05,339 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:53:05,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:05,443 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:53:05,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741476407] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:05,443 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:53:05,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12, 7] total 19 [2021-12-06 21:53:05,443 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903000192] [2021-12-06 21:53:05,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:53:05,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 21:53:05,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:05,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 21:53:05,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2021-12-06 21:53:05,444 INFO L87 Difference]: Start difference. First operand 266 states and 348 transitions. Second operand has 6 states, 6 states have (on average 5.833333333333333) internal successors, (35), 6 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-06 21:53:05,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:05,591 INFO L93 Difference]: Finished difference Result 330 states and 431 transitions. [2021-12-06 21:53:05,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:53:05,592 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.833333333333333) internal successors, (35), 6 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2021-12-06 21:53:05,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:05,593 INFO L225 Difference]: With dead ends: 330 [2021-12-06 21:53:05,593 INFO L226 Difference]: Without dead ends: 294 [2021-12-06 21:53:05,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2021-12-06 21:53:05,594 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 123 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:05,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 149 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:53:05,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2021-12-06 21:53:05,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 272. [2021-12-06 21:53:05,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 260 states have (on average 1.3038461538461539) internal successors, (339), 261 states have internal predecessors, (339), 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) [2021-12-06 21:53:05,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 354 transitions. [2021-12-06 21:53:05,650 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 354 transitions. Word has length 45 [2021-12-06 21:53:05,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:05,650 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 354 transitions. [2021-12-06 21:53:05,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.833333333333333) internal successors, (35), 6 states have internal predecessors, (35), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-12-06 21:53:05,651 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 354 transitions. [2021-12-06 21:53:05,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-06 21:53:05,651 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:05,651 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:53:05,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-12-06 21:53:05,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-12-06 21:53:05,852 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:05,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:05,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1386234216, now seen corresponding path program 2 times [2021-12-06 21:53:05,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:05,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322596795] [2021-12-06 21:53:05,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:05,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:05,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:06,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-06 21:53:06,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:06,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-12-06 21:53:06,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:06,115 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:53:06,115 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:06,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322596795] [2021-12-06 21:53:06,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322596795] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:06,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907258421] [2021-12-06 21:53:06,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:53:06,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:06,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:06,116 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:06,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-06 21:53:06,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:53:06,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:06,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 17 conjunts are in the unsatisfiable core [2021-12-06 21:53:06,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:06,331 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 21:53:06,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:06,439 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-06 21:53:06,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907258421] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:06,439 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:53:06,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [16, 8] total 23 [2021-12-06 21:53:06,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996285357] [2021-12-06 21:53:06,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:53:06,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-06 21:53:06,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:06,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-06 21:53:06,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2021-12-06 21:53:06,440 INFO L87 Difference]: Start difference. First operand 272 states and 354 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 1 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) [2021-12-06 21:53:06,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:06,569 INFO L93 Difference]: Finished difference Result 308 states and 396 transitions. [2021-12-06 21:53:06,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:53:06,569 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 1 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 47 [2021-12-06 21:53:06,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:06,571 INFO L225 Difference]: With dead ends: 308 [2021-12-06 21:53:06,571 INFO L226 Difference]: Without dead ends: 268 [2021-12-06 21:53:06,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=518, Unknown=0, NotChecked=0, Total=600 [2021-12-06 21:53:06,571 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 136 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:06,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 136 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:53:06,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-12-06 21:53:06,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 266. [2021-12-06 21:53:06,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 255 states have (on average 1.3019607843137255) internal successors, (332), 256 states have internal predecessors, (332), 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) [2021-12-06 21:53:06,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 345 transitions. [2021-12-06 21:53:06,620 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 345 transitions. Word has length 47 [2021-12-06 21:53:06,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:06,621 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 345 transitions. [2021-12-06 21:53:06,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 1 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) [2021-12-06 21:53:06,621 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 345 transitions. [2021-12-06 21:53:06,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-06 21:53:06,621 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:06,622 INFO L514 BasicCegarLoop]: 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] [2021-12-06 21:53:06,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-06 21:53:06,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-12-06 21:53:06,823 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:06,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:06,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1011805829, now seen corresponding path program 1 times [2021-12-06 21:53:06,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:06,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274069994] [2021-12-06 21:53:06,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:06,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:06,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:07,275 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-12-06 21:53:07,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:07,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-06 21:53:07,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:07,279 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-12-06 21:53:07,279 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:07,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274069994] [2021-12-06 21:53:07,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274069994] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:07,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178572334] [2021-12-06 21:53:07,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:07,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:07,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:07,280 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:07,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-06 21:53:07,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:07,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-06 21:53:07,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:07,541 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:53:07,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:07,823 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-06 21:53:07,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178572334] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:07,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:07,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 10, 9] total 27 [2021-12-06 21:53:07,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934970470] [2021-12-06 21:53:07,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:07,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-06 21:53:07,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:07,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-06 21:53:07,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2021-12-06 21:53:07,825 INFO L87 Difference]: Start difference. First operand 266 states and 345 transitions. Second operand has 27 states, 27 states have (on average 3.185185185185185) internal successors, (86), 27 states have internal predecessors, (86), 5 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) [2021-12-06 21:53:10,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:10,879 INFO L93 Difference]: Finished difference Result 592 states and 777 transitions. [2021-12-06 21:53:10,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-12-06 21:53:10,880 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.185185185185185) internal successors, (86), 27 states have internal predecessors, (86), 5 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 48 [2021-12-06 21:53:10,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:10,882 INFO L225 Difference]: With dead ends: 592 [2021-12-06 21:53:10,882 INFO L226 Difference]: Without dead ends: 520 [2021-12-06 21:53:10,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 608 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=421, Invalid=2335, Unknown=0, NotChecked=0, Total=2756 [2021-12-06 21:53:10,883 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 880 mSDsluCounter, 1145 mSDsCounter, 0 mSdLazyCounter, 1052 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 880 SdHoareTripleChecker+Valid, 1242 SdHoareTripleChecker+Invalid, 1229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 1052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:10,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [880 Valid, 1242 Invalid, 1229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 1052 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-12-06 21:53:10,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-12-06 21:53:10,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 266. [2021-12-06 21:53:10,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 255 states have (on average 1.2784313725490195) internal successors, (326), 256 states have internal predecessors, (326), 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) [2021-12-06 21:53:10,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 339 transitions. [2021-12-06 21:53:10,941 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 339 transitions. Word has length 48 [2021-12-06 21:53:10,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:10,941 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 339 transitions. [2021-12-06 21:53:10,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 3.185185185185185) internal successors, (86), 27 states have internal predecessors, (86), 5 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) [2021-12-06 21:53:10,941 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 339 transitions. [2021-12-06 21:53:10,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-06 21:53:10,942 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:10,942 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:53:10,961 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-06 21:53:11,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-06 21:53:11,143 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:11,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:11,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1719898279, now seen corresponding path program 3 times [2021-12-06 21:53:11,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:11,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260340066] [2021-12-06 21:53:11,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:11,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:11,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:11,577 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:53:11,577 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:11,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260340066] [2021-12-06 21:53:11,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1260340066] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:11,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38123245] [2021-12-06 21:53:11,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 21:53:11,578 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:11,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:11,578 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:11,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-06 21:53:11,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-06 21:53:11,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:11,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 43 conjunts are in the unsatisfiable core [2021-12-06 21:53:11,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:11,996 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-06 21:53:11,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-06 21:53:12,013 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-06 21:53:12,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:12,152 INFO L354 Elim1Store]: treesize reduction 24, result has 76.0 percent of original size [2021-12-06 21:53:12,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:53:12,303 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-06 21:53:12,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38123245] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:12,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:12,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9, 8] total 29 [2021-12-06 21:53:12,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154237342] [2021-12-06 21:53:12,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:12,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-12-06 21:53:12,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:12,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-12-06 21:53:12,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2021-12-06 21:53:12,304 INFO L87 Difference]: Start difference. First operand 266 states and 339 transitions. Second operand has 29 states, 29 states have (on average 2.793103448275862) internal successors, (81), 29 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:13,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:13,578 INFO L93 Difference]: Finished difference Result 642 states and 850 transitions. [2021-12-06 21:53:13,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-12-06 21:53:13,579 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.793103448275862) internal successors, (81), 29 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-06 21:53:13,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:13,581 INFO L225 Difference]: With dead ends: 642 [2021-12-06 21:53:13,581 INFO L226 Difference]: Without dead ends: 534 [2021-12-06 21:53:13,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=407, Invalid=2349, Unknown=0, NotChecked=0, Total=2756 [2021-12-06 21:53:13,583 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 447 mSDsluCounter, 1229 mSDsCounter, 0 mSdLazyCounter, 1168 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 451 SdHoareTripleChecker+Valid, 1334 SdHoareTripleChecker+Invalid, 1321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 1168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:13,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [451 Valid, 1334 Invalid, 1321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 1168 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-06 21:53:13,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-12-06 21:53:13,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 270. [2021-12-06 21:53:13,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 259 states have (on average 1.2664092664092663) internal successors, (328), 260 states have internal predecessors, (328), 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) [2021-12-06 21:53:13,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 341 transitions. [2021-12-06 21:53:13,653 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 341 transitions. Word has length 47 [2021-12-06 21:53:13,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:13,653 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 341 transitions. [2021-12-06 21:53:13,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.793103448275862) internal successors, (81), 29 states have internal predecessors, (81), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:13,653 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 341 transitions. [2021-12-06 21:53:13,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-06 21:53:13,654 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:13,654 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:53:13,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-12-06 21:53:13,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-12-06 21:53:13,855 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:13,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:13,857 INFO L85 PathProgramCache]: Analyzing trace with hash 862887189, now seen corresponding path program 4 times [2021-12-06 21:53:13,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:13,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286188165] [2021-12-06 21:53:13,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:13,858 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:13,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:14,288 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:53:14,288 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:14,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286188165] [2021-12-06 21:53:14,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286188165] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:14,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527425772] [2021-12-06 21:53:14,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-06 21:53:14,289 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:14,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:14,289 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:14,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-06 21:53:14,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-06 21:53:14,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:14,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 62 conjunts are in the unsatisfiable core [2021-12-06 21:53:14,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:14,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:53:14,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:53:14,743 INFO L354 Elim1Store]: treesize reduction 27, result has 57.8 percent of original size [2021-12-06 21:53:14,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 77 treesize of output 71 [2021-12-06 21:53:14,776 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:53:14,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:15,162 INFO L354 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-06 21:53:15,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:53:15,704 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-06 21:53:15,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527425772] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:15,705 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:15,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 17] total 50 [2021-12-06 21:53:15,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802516175] [2021-12-06 21:53:15,705 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:15,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-06 21:53:15,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:15,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-06 21:53:15,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2212, Unknown=0, NotChecked=0, Total=2450 [2021-12-06 21:53:15,707 INFO L87 Difference]: Start difference. First operand 270 states and 341 transitions. Second operand has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:17,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:17,670 INFO L93 Difference]: Finished difference Result 472 states and 613 transitions. [2021-12-06 21:53:17,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-12-06 21:53:17,670 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-06 21:53:17,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:17,672 INFO L225 Difference]: With dead ends: 472 [2021-12-06 21:53:17,672 INFO L226 Difference]: Without dead ends: 441 [2021-12-06 21:53:17,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1341 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=575, Invalid=4255, Unknown=0, NotChecked=0, Total=4830 [2021-12-06 21:53:17,674 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 590 mSDsluCounter, 1939 mSDsCounter, 0 mSdLazyCounter, 1523 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 598 SdHoareTripleChecker+Valid, 2050 SdHoareTripleChecker+Invalid, 1643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 1523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:17,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [598 Valid, 2050 Invalid, 1643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 1523 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-12-06 21:53:17,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-12-06 21:53:17,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 276. [2021-12-06 21:53:17,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 265 states have (on average 1.260377358490566) internal successors, (334), 266 states have internal predecessors, (334), 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) [2021-12-06 21:53:17,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 347 transitions. [2021-12-06 21:53:17,735 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 347 transitions. Word has length 47 [2021-12-06 21:53:17,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:17,735 INFO L470 AbstractCegarLoop]: Abstraction has 276 states and 347 transitions. [2021-12-06 21:53:17,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.3) internal successors, (115), 49 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:17,735 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 347 transitions. [2021-12-06 21:53:17,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-12-06 21:53:17,736 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:17,736 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:53:17,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-12-06 21:53:17,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-12-06 21:53:17,937 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:17,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:17,938 INFO L85 PathProgramCache]: Analyzing trace with hash -144056787, now seen corresponding path program 5 times [2021-12-06 21:53:17,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:17,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458357083] [2021-12-06 21:53:17,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:17,940 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:18,364 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:53:18,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:18,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458357083] [2021-12-06 21:53:18,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458357083] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:18,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926902350] [2021-12-06 21:53:18,365 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-06 21:53:18,365 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:18,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:18,365 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:18,366 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-06 21:53:19,032 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-12-06 21:53:19,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:19,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 67 conjunts are in the unsatisfiable core [2021-12-06 21:53:19,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:19,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-06 21:53:19,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-12-06 21:53:19,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:53:19,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:53:19,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:53:19,483 INFO L354 Elim1Store]: treesize reduction 68, result has 4.2 percent of original size [2021-12-06 21:53:19,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 3 case distinctions, treesize of input 82 treesize of output 38 [2021-12-06 21:53:19,506 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 21:53:19,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:20,067 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-06 21:53:20,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926902350] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:20,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:20,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 17] total 51 [2021-12-06 21:53:20,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063505764] [2021-12-06 21:53:20,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:20,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-12-06 21:53:20,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:20,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-12-06 21:53:20,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2294, Unknown=0, NotChecked=0, Total=2550 [2021-12-06 21:53:20,068 INFO L87 Difference]: Start difference. First operand 276 states and 347 transitions. Second operand has 51 states, 51 states have (on average 2.2549019607843137) internal successors, (115), 50 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:22,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:22,263 INFO L93 Difference]: Finished difference Result 544 states and 707 transitions. [2021-12-06 21:53:22,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-06 21:53:22,263 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.2549019607843137) internal successors, (115), 50 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-12-06 21:53:22,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:22,265 INFO L225 Difference]: With dead ends: 544 [2021-12-06 21:53:22,265 INFO L226 Difference]: Without dead ends: 442 [2021-12-06 21:53:22,265 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1283 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=668, Invalid=5032, Unknown=0, NotChecked=0, Total=5700 [2021-12-06 21:53:22,266 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 452 mSDsluCounter, 2579 mSDsCounter, 0 mSdLazyCounter, 1874 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 452 SdHoareTripleChecker+Valid, 2695 SdHoareTripleChecker+Invalid, 1989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 1874 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:22,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [452 Valid, 2695 Invalid, 1989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 1874 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-12-06 21:53:22,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-12-06 21:53:22,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 288. [2021-12-06 21:53:22,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 277 states have (on average 1.259927797833935) internal successors, (349), 278 states have internal predecessors, (349), 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) [2021-12-06 21:53:22,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 362 transitions. [2021-12-06 21:53:22,337 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 362 transitions. Word has length 47 [2021-12-06 21:53:22,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:22,337 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 362 transitions. [2021-12-06 21:53:22,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.2549019607843137) internal successors, (115), 50 states have internal predecessors, (115), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:22,337 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 362 transitions. [2021-12-06 21:53:22,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-06 21:53:22,338 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:22,338 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:53:22,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-12-06 21:53:22,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:22,539 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:22,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:22,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1577867576, now seen corresponding path program 2 times [2021-12-06 21:53:22,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:22,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520286949] [2021-12-06 21:53:22,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:22,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:22,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:22,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-06 21:53:22,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:22,821 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-06 21:53:22,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:22,832 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-06 21:53:22,832 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:22,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520286949] [2021-12-06 21:53:22,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520286949] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:22,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590269533] [2021-12-06 21:53:22,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:53:22,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:22,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:22,834 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:22,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-06 21:53:22,903 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:53:22,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:22,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 41 conjunts are in the unsatisfiable core [2021-12-06 21:53:22,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:23,051 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-06 21:53:23,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-06 21:53:23,070 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-06 21:53:23,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:23,184 INFO L354 Elim1Store]: treesize reduction 24, result has 76.0 percent of original size [2021-12-06 21:53:23,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:53:23,336 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-06 21:53:23,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590269533] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:23,336 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:23,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 10] total 22 [2021-12-06 21:53:23,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808031907] [2021-12-06 21:53:23,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:23,337 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-06 21:53:23,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:23,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-06 21:53:23,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-12-06 21:53:23,337 INFO L87 Difference]: Start difference. First operand 288 states and 362 transitions. Second operand has 22 states, 20 states have (on average 3.85) internal successors, (77), 22 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:53:23,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:23,784 INFO L93 Difference]: Finished difference Result 431 states and 553 transitions. [2021-12-06 21:53:23,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-06 21:53:23,784 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 3.85) internal successors, (77), 22 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 51 [2021-12-06 21:53:23,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:23,786 INFO L225 Difference]: With dead ends: 431 [2021-12-06 21:53:23,786 INFO L226 Difference]: Without dead ends: 406 [2021-12-06 21:53:23,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=162, Invalid=594, Unknown=0, NotChecked=0, Total=756 [2021-12-06 21:53:23,787 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 286 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:23,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [294 Valid, 570 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-06 21:53:23,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-12-06 21:53:23,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 304. [2021-12-06 21:53:23,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 291 states have (on average 1.2508591065292096) internal successors, (364), 292 states have internal predecessors, (364), 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) [2021-12-06 21:53:23,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 381 transitions. [2021-12-06 21:53:23,856 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 381 transitions. Word has length 51 [2021-12-06 21:53:23,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:23,856 INFO L470 AbstractCegarLoop]: Abstraction has 304 states and 381 transitions. [2021-12-06 21:53:23,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 3.85) internal successors, (77), 22 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-12-06 21:53:23,856 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 381 transitions. [2021-12-06 21:53:23,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-12-06 21:53:23,857 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:23,857 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:53:23,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-12-06 21:53:24,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:24,058 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:24,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:24,059 INFO L85 PathProgramCache]: Analyzing trace with hash 933712923, now seen corresponding path program 2 times [2021-12-06 21:53:24,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:24,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730397813] [2021-12-06 21:53:24,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:24,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:24,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:24,208 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:53:24,208 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:24,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730397813] [2021-12-06 21:53:24,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730397813] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:24,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404762329] [2021-12-06 21:53:24,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:53:24,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:24,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:24,209 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:24,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-06 21:53:24,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:53:24,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:24,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-12-06 21:53:24,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:24,977 INFO L354 Elim1Store]: treesize reduction 7, result has 56.3 percent of original size [2021-12-06 21:53:24,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-12-06 21:53:25,012 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:53:25,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:25,365 INFO L354 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-06 21:53:25,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:53:25,965 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-06 21:53:25,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404762329] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:25,965 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:25,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 18, 13] total 35 [2021-12-06 21:53:25,966 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528538573] [2021-12-06 21:53:25,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:25,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-06 21:53:25,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:25,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-06 21:53:25,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1079, Unknown=0, NotChecked=0, Total=1190 [2021-12-06 21:53:25,967 INFO L87 Difference]: Start difference. First operand 304 states and 381 transitions. Second operand has 35 states, 35 states have (on average 3.057142857142857) internal successors, (107), 35 states have internal predecessors, (107), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:33,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:33,546 INFO L93 Difference]: Finished difference Result 1424 states and 1882 transitions. [2021-12-06 21:53:33,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-12-06 21:53:33,547 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.057142857142857) internal successors, (107), 35 states have internal predecessors, (107), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-12-06 21:53:33,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:33,552 INFO L225 Difference]: With dead ends: 1424 [2021-12-06 21:53:33,552 INFO L226 Difference]: Without dead ends: 1269 [2021-12-06 21:53:33,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2380 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1065, Invalid=8247, Unknown=0, NotChecked=0, Total=9312 [2021-12-06 21:53:33,553 INFO L933 BasicCegarLoop]: 198 mSDtfsCounter, 1917 mSDsluCounter, 2836 mSDsCounter, 0 mSdLazyCounter, 3548 mSolverCounterSat, 648 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1925 SdHoareTripleChecker+Valid, 3034 SdHoareTripleChecker+Invalid, 4196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 648 IncrementalHoareTripleChecker+Valid, 3548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:33,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1925 Valid, 3034 Invalid, 4196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [648 Valid, 3548 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-12-06 21:53:33,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1269 states. [2021-12-06 21:53:33,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1269 to 445. [2021-12-06 21:53:33,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 432 states have (on average 1.2662037037037037) internal successors, (547), 433 states have internal predecessors, (547), 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) [2021-12-06 21:53:33,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 564 transitions. [2021-12-06 21:53:33,669 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 564 transitions. Word has length 49 [2021-12-06 21:53:33,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:33,669 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 564 transitions. [2021-12-06 21:53:33,669 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.057142857142857) internal successors, (107), 35 states have internal predecessors, (107), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:33,669 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 564 transitions. [2021-12-06 21:53:33,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-06 21:53:33,670 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:33,670 INFO L514 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:53:33,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-12-06 21:53:33,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-12-06 21:53:33,871 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:33,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:33,871 INFO L85 PathProgramCache]: Analyzing trace with hash 832365819, now seen corresponding path program 1 times [2021-12-06 21:53:33,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:33,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46563892] [2021-12-06 21:53:33,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:33,871 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:33,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:34,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-06 21:53:34,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:34,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-06 21:53:34,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:34,135 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 21:53:34,135 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:34,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46563892] [2021-12-06 21:53:34,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46563892] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:34,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145976463] [2021-12-06 21:53:34,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:34,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:34,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:34,136 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:34,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-06 21:53:34,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:34,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 45 conjunts are in the unsatisfiable core [2021-12-06 21:53:34,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:35,428 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_3| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_3|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_3| 4)) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_3|) 0))) is different from true [2021-12-06 21:53:39,971 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_4| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_4|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_4| 4)) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_4|) 0))) is different from true [2021-12-06 21:53:41,146 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-12-06 21:53:41,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 10 [2021-12-06 21:53:41,164 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 5 trivial. 2 not checked. [2021-12-06 21:53:41,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:41,301 INFO L354 Elim1Store]: treesize reduction 25, result has 76.4 percent of original size [2021-12-06 21:53:41,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:53:41,631 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-12-06 21:53:41,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145976463] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:41,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:41,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 13] total 39 [2021-12-06 21:53:41,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454455771] [2021-12-06 21:53:41,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:41,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-06 21:53:41,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:41,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-06 21:53:41,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1163, Unknown=2, NotChecked=142, Total=1482 [2021-12-06 21:53:41,632 INFO L87 Difference]: Start difference. First operand 445 states and 564 transitions. Second operand has 39 states, 38 states have (on average 3.1842105263157894) internal successors, (121), 37 states have internal predecessors, (121), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-06 21:53:46,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:46,798 INFO L93 Difference]: Finished difference Result 758 states and 978 transitions. [2021-12-06 21:53:46,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-06 21:53:46,798 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.1842105263157894) internal successors, (121), 37 states have internal predecessors, (121), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 52 [2021-12-06 21:53:46,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:46,801 INFO L225 Difference]: With dead ends: 758 [2021-12-06 21:53:46,801 INFO L226 Difference]: Without dead ends: 615 [2021-12-06 21:53:46,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=237, Invalid=1572, Unknown=5, NotChecked=166, Total=1980 [2021-12-06 21:53:46,801 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 224 mSDsluCounter, 1362 mSDsCounter, 0 mSdLazyCounter, 964 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 1460 SdHoareTripleChecker+Invalid, 1382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 964 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 385 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:46,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 1460 Invalid, 1382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 964 Invalid, 0 Unknown, 385 Unchecked, 0.4s Time] [2021-12-06 21:53:46,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-12-06 21:53:46,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 466. [2021-12-06 21:53:46,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 448 states have (on average 1.2589285714285714) internal successors, (564), 450 states have internal predecessors, (564), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:53:46,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 585 transitions. [2021-12-06 21:53:46,921 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 585 transitions. Word has length 52 [2021-12-06 21:53:46,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:46,921 INFO L470 AbstractCegarLoop]: Abstraction has 466 states and 585 transitions. [2021-12-06 21:53:46,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.1842105263157894) internal successors, (121), 37 states have internal predecessors, (121), 7 states have call successors, (8), 5 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-12-06 21:53:46,921 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 585 transitions. [2021-12-06 21:53:46,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-12-06 21:53:46,923 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:46,923 INFO L514 BasicCegarLoop]: trace histogram [4, 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] [2021-12-06 21:53:46,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-12-06 21:53:47,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:47,123 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:47,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:47,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1251822086, now seen corresponding path program 6 times [2021-12-06 21:53:47,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:47,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194677045] [2021-12-06 21:53:47,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:47,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:47,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:47,309 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-06 21:53:47,309 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:47,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194677045] [2021-12-06 21:53:47,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194677045] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:47,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659554402] [2021-12-06 21:53:47,309 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-06 21:53:47,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:47,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:47,310 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:47,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-06 21:53:47,422 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-12-06 21:53:47,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:53:47,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-06 21:53:47,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:47,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:53:47,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:53:47,722 INFO L354 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2021-12-06 21:53:47,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 72 treesize of output 37 [2021-12-06 21:53:47,749 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:53:47,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:48,069 INFO L354 Elim1Store]: treesize reduction 30, result has 73.2 percent of original size [2021-12-06 21:53:48,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:53:48,378 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:53:48,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659554402] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:48,378 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:48,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 13] total 34 [2021-12-06 21:53:48,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108133920] [2021-12-06 21:53:48,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:48,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-12-06 21:53:48,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:48,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-12-06 21:53:48,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2021-12-06 21:53:48,379 INFO L87 Difference]: Start difference. First operand 466 states and 585 transitions. Second operand has 34 states, 34 states have (on average 2.911764705882353) internal successors, (99), 33 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:54,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:54,162 INFO L93 Difference]: Finished difference Result 1563 states and 2020 transitions. [2021-12-06 21:53:54,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-12-06 21:53:54,162 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.911764705882353) internal successors, (99), 33 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-12-06 21:53:54,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:54,168 INFO L225 Difference]: With dead ends: 1563 [2021-12-06 21:53:54,168 INFO L226 Difference]: Without dead ends: 1258 [2021-12-06 21:53:54,169 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=519, Invalid=3903, Unknown=0, NotChecked=0, Total=4422 [2021-12-06 21:53:54,169 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 655 mSDsluCounter, 2772 mSDsCounter, 0 mSdLazyCounter, 2355 mSolverCounterSat, 233 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 659 SdHoareTripleChecker+Valid, 2938 SdHoareTripleChecker+Invalid, 2588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 233 IncrementalHoareTripleChecker+Valid, 2355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:54,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [659 Valid, 2938 Invalid, 2588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [233 Valid, 2355 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2021-12-06 21:53:54,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1258 states. [2021-12-06 21:53:54,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1258 to 512. [2021-12-06 21:53:54,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 512 states, 494 states have (on average 1.2611336032388665) internal successors, (623), 496 states have internal predecessors, (623), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:53:54,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 512 states to 512 states and 644 transitions. [2021-12-06 21:53:54,318 INFO L78 Accepts]: Start accepts. Automaton has 512 states and 644 transitions. Word has length 50 [2021-12-06 21:53:54,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:54,318 INFO L470 AbstractCegarLoop]: Abstraction has 512 states and 644 transitions. [2021-12-06 21:53:54,318 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.911764705882353) internal successors, (99), 33 states have internal predecessors, (99), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:54,319 INFO L276 IsEmpty]: Start isEmpty. Operand 512 states and 644 transitions. [2021-12-06 21:53:54,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-12-06 21:53:54,319 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:54,320 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 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] [2021-12-06 21:53:54,323 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-12-06 21:53:54,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-12-06 21:53:54,520 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:54,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:54,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1768465341, now seen corresponding path program 1 times [2021-12-06 21:53:54,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:54,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942084344] [2021-12-06 21:53:54,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:54,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:54,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:54,607 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-06 21:53:54,607 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:54,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942084344] [2021-12-06 21:53:54,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942084344] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:54,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704839536] [2021-12-06 21:53:54,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:54,608 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:54,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:54,609 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:54,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-12-06 21:53:54,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:54,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-06 21:53:54,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:54,817 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 28 proven. 17 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-06 21:53:54,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:54,965 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-06 21:53:54,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704839536] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:54,965 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:54,965 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 9] total 27 [2021-12-06 21:53:54,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383505942] [2021-12-06 21:53:54,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:54,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-06 21:53:54,966 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:54,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-06 21:53:54,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=636, Unknown=0, NotChecked=0, Total=702 [2021-12-06 21:53:54,966 INFO L87 Difference]: Start difference. First operand 512 states and 644 transitions. Second operand has 27 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:55,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:53:55,622 INFO L93 Difference]: Finished difference Result 727 states and 918 transitions. [2021-12-06 21:53:55,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-06 21:53:55,623 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-12-06 21:53:55,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:53:55,625 INFO L225 Difference]: With dead ends: 727 [2021-12-06 21:53:55,626 INFO L226 Difference]: Without dead ends: 614 [2021-12-06 21:53:55,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2021-12-06 21:53:55,626 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 93 mSDsluCounter, 1352 mSDsCounter, 0 mSdLazyCounter, 943 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 1425 SdHoareTripleChecker+Invalid, 975 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 943 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-06 21:53:55,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 1425 Invalid, 975 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 943 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-06 21:53:55,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-12-06 21:53:55,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 534. [2021-12-06 21:53:55,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 534 states, 516 states have (on average 1.2577519379844961) internal successors, (649), 518 states have internal predecessors, (649), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:53:55,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 670 transitions. [2021-12-06 21:53:55,770 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 670 transitions. Word has length 51 [2021-12-06 21:53:55,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:53:55,770 INFO L470 AbstractCegarLoop]: Abstraction has 534 states and 670 transitions. [2021-12-06 21:53:55,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.5) internal successors, (91), 26 states have internal predecessors, (91), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:53:55,770 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 670 transitions. [2021-12-06 21:53:55,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-12-06 21:53:55,771 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:53:55,771 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-12-06 21:53:55,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-12-06 21:53:55,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-12-06 21:53:55,972 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:53:55,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:53:55,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1341258368, now seen corresponding path program 7 times [2021-12-06 21:53:55,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:53:55,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944787270] [2021-12-06 21:53:55,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:53:55,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:53:55,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 5 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:53:56,385 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:53:56,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944787270] [2021-12-06 21:53:56,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944787270] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:53:56,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005166302] [2021-12-06 21:53:56,386 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-06 21:53:56,386 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:53:56,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:53:56,387 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:53:56,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-12-06 21:53:56,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:53:56,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-06 21:53:56,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:53:57,036 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 52 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:53:57,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:53:58,094 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-12-06 21:53:58,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005166302] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:53:58,095 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:53:58,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20, 18] total 47 [2021-12-06 21:53:58,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578587491] [2021-12-06 21:53:58,095 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:53:58,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-12-06 21:53:58,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:53:58,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-12-06 21:53:58,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=1906, Unknown=0, NotChecked=0, Total=2162 [2021-12-06 21:53:58,096 INFO L87 Difference]: Start difference. First operand 534 states and 670 transitions. Second operand has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 47 states have internal predecessors, (106), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:54:20,734 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-06 21:55:29,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:55:29,432 INFO L93 Difference]: Finished difference Result 5064 states and 6605 transitions. [2021-12-06 21:55:29,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 150 states. [2021-12-06 21:55:29,432 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 47 states have internal predecessors, (106), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-12-06 21:55:29,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:55:29,451 INFO L225 Difference]: With dead ends: 5064 [2021-12-06 21:55:29,451 INFO L226 Difference]: Without dead ends: 5054 [2021-12-06 21:55:29,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 75 SyntacticMatches, 7 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12254 ImplicationChecksByTransitivity, 78.0s TimeCoverageRelationStatistics Valid=4437, Invalid=32618, Unknown=1, NotChecked=0, Total=37056 [2021-12-06 21:55:29,455 INFO L933 BasicCegarLoop]: 434 mSDtfsCounter, 6832 mSDsluCounter, 6838 mSDsCounter, 0 mSdLazyCounter, 4790 mSolverCounterSat, 1842 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6832 SdHoareTripleChecker+Valid, 7272 SdHoareTripleChecker+Invalid, 6632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1842 IncrementalHoareTripleChecker+Valid, 4790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.5s IncrementalHoareTripleChecker+Time [2021-12-06 21:55:29,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6832 Valid, 7272 Invalid, 6632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1842 Valid, 4790 Invalid, 0 Unknown, 0 Unchecked, 12.5s Time] [2021-12-06 21:55:29,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5054 states. [2021-12-06 21:55:29,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5054 to 549. [2021-12-06 21:55:29,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 549 states, 531 states have (on average 1.2598870056497176) internal successors, (669), 533 states have internal predecessors, (669), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:55:29,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 549 states to 549 states and 690 transitions. [2021-12-06 21:55:29,670 INFO L78 Accepts]: Start accepts. Automaton has 549 states and 690 transitions. Word has length 52 [2021-12-06 21:55:29,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:55:29,670 INFO L470 AbstractCegarLoop]: Abstraction has 549 states and 690 transitions. [2021-12-06 21:55:29,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 47 states have internal predecessors, (106), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:55:29,670 INFO L276 IsEmpty]: Start isEmpty. Operand 549 states and 690 transitions. [2021-12-06 21:55:29,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-06 21:55:29,671 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:55:29,671 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:55:29,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-12-06 21:55:29,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-12-06 21:55:29,872 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:55:29,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:55:29,873 INFO L85 PathProgramCache]: Analyzing trace with hash 446882330, now seen corresponding path program 1 times [2021-12-06 21:55:29,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:55:29,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299835688] [2021-12-06 21:55:29,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:55:29,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:55:29,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:29,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-06 21:55:29,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:29,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-06 21:55:29,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:29,932 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-06 21:55:29,933 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:55:29,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299835688] [2021-12-06 21:55:29,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299835688] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:55:29,933 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:55:29,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-12-06 21:55:29,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518468476] [2021-12-06 21:55:29,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:55:29,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-12-06 21:55:29,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:55:29,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-12-06 21:55:29,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-06 21:55:29,934 INFO L87 Difference]: Start difference. First operand 549 states and 690 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 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) [2021-12-06 21:55:30,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:55:30,138 INFO L93 Difference]: Finished difference Result 572 states and 717 transitions. [2021-12-06 21:55:30,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-12-06 21:55:30,139 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 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 57 [2021-12-06 21:55:30,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:55:30,141 INFO L225 Difference]: With dead ends: 572 [2021-12-06 21:55:30,141 INFO L226 Difference]: Without dead ends: 551 [2021-12-06 21:55:30,141 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-12-06 21:55:30,142 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 7 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 107 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 [2021-12-06 21:55:30,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 107 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:55:30,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-12-06 21:55:30,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 549. [2021-12-06 21:55:30,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 549 states, 531 states have (on average 1.256120527306968) internal successors, (667), 533 states have internal predecessors, (667), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:55:30,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 549 states to 549 states and 688 transitions. [2021-12-06 21:55:30,321 INFO L78 Accepts]: Start accepts. Automaton has 549 states and 688 transitions. Word has length 57 [2021-12-06 21:55:30,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:55:30,321 INFO L470 AbstractCegarLoop]: Abstraction has 549 states and 688 transitions. [2021-12-06 21:55:30,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 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) [2021-12-06 21:55:30,321 INFO L276 IsEmpty]: Start isEmpty. Operand 549 states and 688 transitions. [2021-12-06 21:55:30,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-12-06 21:55:30,322 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:55:30,322 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:55:30,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-12-06 21:55:30,322 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:55:30,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:55:30,323 INFO L85 PathProgramCache]: Analyzing trace with hash -524689537, now seen corresponding path program 8 times [2021-12-06 21:55:30,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:55:30,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1987216796] [2021-12-06 21:55:30,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:55:30,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:55:30,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:30,434 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 10 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-06 21:55:30,434 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:55:30,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1987216796] [2021-12-06 21:55:30,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1987216796] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:55:30,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [357083961] [2021-12-06 21:55:30,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:55:30,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:55:30,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:55:30,435 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:55:30,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-12-06 21:55:30,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:55:30,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:55:30,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 42 conjunts are in the unsatisfiable core [2021-12-06 21:55:30,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:55:31,323 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-12-06 21:55:31,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:55:31,910 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-12-06 21:55:31,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [357083961] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:55:31,910 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:55:31,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 13] total 31 [2021-12-06 21:55:31,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242201173] [2021-12-06 21:55:31,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:55:31,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-12-06 21:55:31,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:55:31,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-12-06 21:55:31,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=792, Unknown=0, NotChecked=0, Total=930 [2021-12-06 21:55:31,911 INFO L87 Difference]: Start difference. First operand 549 states and 688 transitions. Second operand has 31 states, 31 states have (on average 3.0) internal successors, (93), 31 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:55:35,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:55:35,211 INFO L93 Difference]: Finished difference Result 819 states and 1020 transitions. [2021-12-06 21:55:35,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-12-06 21:55:35,211 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-12-06 21:55:35,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:55:35,214 INFO L225 Difference]: With dead ends: 819 [2021-12-06 21:55:35,214 INFO L226 Difference]: Without dead ends: 595 [2021-12-06 21:55:35,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 648 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=585, Invalid=2955, Unknown=0, NotChecked=0, Total=3540 [2021-12-06 21:55:35,215 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 452 mSDsluCounter, 1957 mSDsCounter, 0 mSdLazyCounter, 1216 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 452 SdHoareTripleChecker+Valid, 2083 SdHoareTripleChecker+Invalid, 1324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 1216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-12-06 21:55:35,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [452 Valid, 2083 Invalid, 1324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 1216 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-12-06 21:55:35,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2021-12-06 21:55:35,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 397. [2021-12-06 21:55:35,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 379 states have (on average 1.2401055408970976) internal successors, (470), 381 states have internal predecessors, (470), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:55:35,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 491 transitions. [2021-12-06 21:55:35,350 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 491 transitions. Word has length 55 [2021-12-06 21:55:35,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:55:35,350 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 491 transitions. [2021-12-06 21:55:35,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.0) internal successors, (93), 31 states have internal predecessors, (93), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:55:35,350 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 491 transitions. [2021-12-06 21:55:35,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-12-06 21:55:35,351 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:55:35,351 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 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] [2021-12-06 21:55:35,371 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-12-06 21:55:35,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-12-06 21:55:35,552 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:55:35,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:55:35,554 INFO L85 PathProgramCache]: Analyzing trace with hash 161123635, now seen corresponding path program 1 times [2021-12-06 21:55:35,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:55:35,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074740059] [2021-12-06 21:55:35,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:55:35,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:55:35,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:35,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-12-06 21:55:35,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:35,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-12-06 21:55:35,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:35,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-12-06 21:55:35,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:35,707 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 21:55:35,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:55:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074740059] [2021-12-06 21:55:35,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074740059] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:55:35,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352807334] [2021-12-06 21:55:35,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:55:35,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:55:35,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:55:35,708 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:55:35,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-12-06 21:55:35,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:55:35,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 14 conjunts are in the unsatisfiable core [2021-12-06 21:55:35,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:55:35,917 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 21:55:35,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:05,680 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 21:56:05,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352807334] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:05,680 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:05,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 19 [2021-12-06 21:56:05,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495107313] [2021-12-06 21:56:05,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:05,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-12-06 21:56:05,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:05,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-12-06 21:56:05,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=278, Unknown=8, NotChecked=0, Total=342 [2021-12-06 21:56:05,682 INFO L87 Difference]: Start difference. First operand 397 states and 491 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 19 states have internal predecessors, (69), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-06 21:56:06,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:56:06,134 INFO L93 Difference]: Finished difference Result 465 states and 574 transitions. [2021-12-06 21:56:06,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-12-06 21:56:06,135 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 19 states have internal predecessors, (69), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 59 [2021-12-06 21:56:06,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:56:06,136 INFO L225 Difference]: With dead ends: 465 [2021-12-06 21:56:06,136 INFO L226 Difference]: Without dead ends: 382 [2021-12-06 21:56:06,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 113 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=61, Invalid=311, Unknown=8, NotChecked=0, Total=380 [2021-12-06 21:56:06,137 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 64 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 657 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 47 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-06 21:56:06,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 657 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 286 Invalid, 0 Unknown, 47 Unchecked, 0.3s Time] [2021-12-06 21:56:06,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-12-06 21:56:06,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 382. [2021-12-06 21:56:06,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 364 states have (on average 1.2417582417582418) internal successors, (452), 366 states have internal predecessors, (452), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:56:06,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 473 transitions. [2021-12-06 21:56:06,265 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 473 transitions. Word has length 59 [2021-12-06 21:56:06,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:56:06,266 INFO L470 AbstractCegarLoop]: Abstraction has 382 states and 473 transitions. [2021-12-06 21:56:06,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 19 states have internal predecessors, (69), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-06 21:56:06,266 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 473 transitions. [2021-12-06 21:56:06,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-06 21:56:06,267 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:56:06,267 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:56:06,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-12-06 21:56:06,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-12-06 21:56:06,468 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:56:06,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:56:06,469 INFO L85 PathProgramCache]: Analyzing trace with hash 289116221, now seen corresponding path program 9 times [2021-12-06 21:56:06,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:56:06,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763141019] [2021-12-06 21:56:06,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:06,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:56:06,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:07,170 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 47 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-06 21:56:07,170 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:56:07,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763141019] [2021-12-06 21:56:07,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763141019] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:56:07,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844331555] [2021-12-06 21:56:07,171 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 21:56:07,171 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:07,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:56:07,171 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:56:07,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-12-06 21:56:07,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-06 21:56:07,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:56:07,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 79 conjunts are in the unsatisfiable core [2021-12-06 21:56:07,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:56:07,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-06 21:56:07,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-12-06 21:56:08,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:56:08,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:56:08,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:56:08,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 21:56:08,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 0 case distinctions, treesize of input 27 treesize of output 11 [2021-12-06 21:56:08,801 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 62 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:56:08,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:09,468 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-06 21:56:09,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844331555] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:09,468 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:09,468 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24, 16] total 57 [2021-12-06 21:56:09,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581381266] [2021-12-06 21:56:09,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:09,469 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-12-06 21:56:09,469 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:09,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-12-06 21:56:09,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=2842, Unknown=0, NotChecked=0, Total=3192 [2021-12-06 21:56:09,470 INFO L87 Difference]: Start difference. First operand 382 states and 473 transitions. Second operand has 57 states, 57 states have (on average 2.3684210526315788) internal successors, (135), 57 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:12,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:56:12,745 INFO L93 Difference]: Finished difference Result 948 states and 1215 transitions. [2021-12-06 21:56:12,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-12-06 21:56:12,746 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.3684210526315788) internal successors, (135), 57 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-06 21:56:12,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:56:12,749 INFO L225 Difference]: With dead ends: 948 [2021-12-06 21:56:12,749 INFO L226 Difference]: Without dead ends: 831 [2021-12-06 21:56:12,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=736, Invalid=5906, Unknown=0, NotChecked=0, Total=6642 [2021-12-06 21:56:12,750 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 616 mSDsluCounter, 2815 mSDsCounter, 0 mSdLazyCounter, 2858 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 628 SdHoareTripleChecker+Valid, 2954 SdHoareTripleChecker+Invalid, 2992 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 2858 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:56:12,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [628 Valid, 2954 Invalid, 2992 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 2858 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-12-06 21:56:12,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 831 states. [2021-12-06 21:56:12,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 831 to 392. [2021-12-06 21:56:12,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 374 states have (on average 1.2406417112299466) internal successors, (464), 376 states have internal predecessors, (464), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:56:12,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 485 transitions. [2021-12-06 21:56:12,883 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 485 transitions. Word has length 57 [2021-12-06 21:56:12,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:56:12,884 INFO L470 AbstractCegarLoop]: Abstraction has 392 states and 485 transitions. [2021-12-06 21:56:12,884 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.3684210526315788) internal successors, (135), 57 states have internal predecessors, (135), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:12,884 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 485 transitions. [2021-12-06 21:56:12,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-06 21:56:12,884 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:56:12,884 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:56:12,888 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-12-06 21:56:13,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-12-06 21:56:13,086 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:56:13,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:56:13,087 INFO L85 PathProgramCache]: Analyzing trace with hash -392326355, now seen corresponding path program 10 times [2021-12-06 21:56:13,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:56:13,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110073080] [2021-12-06 21:56:13,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:13,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:56:13,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:15,024 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:56:15,024 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:56:15,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110073080] [2021-12-06 21:56:15,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110073080] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:56:15,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770140939] [2021-12-06 21:56:15,024 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-06 21:56:15,024 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:15,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:56:15,025 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:56:15,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-12-06 21:56:15,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-06 21:56:15,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:56:15,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-06 21:56:15,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:56:16,007 INFO L354 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2021-12-06 21:56:16,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 22 [2021-12-06 21:56:16,050 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 58 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:56:16,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:16,596 INFO L354 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-06 21:56:16,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:56:17,590 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-06 21:56:17,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770140939] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:17,591 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:17,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 21, 16] total 61 [2021-12-06 21:56:17,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613442817] [2021-12-06 21:56:17,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:17,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-12-06 21:56:17,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:17,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-12-06 21:56:17,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=3400, Unknown=0, NotChecked=0, Total=3660 [2021-12-06 21:56:17,592 INFO L87 Difference]: Start difference. First operand 392 states and 485 transitions. Second operand has 61 states, 61 states have (on average 2.1311475409836067) internal successors, (130), 61 states have internal predecessors, (130), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:29,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:56:29,255 INFO L93 Difference]: Finished difference Result 1993 states and 2580 transitions. [2021-12-06 21:56:29,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-12-06 21:56:29,255 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.1311475409836067) internal successors, (130), 61 states have internal predecessors, (130), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-06 21:56:29,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:56:29,262 INFO L225 Difference]: With dead ends: 1993 [2021-12-06 21:56:29,262 INFO L226 Difference]: Without dead ends: 1879 [2021-12-06 21:56:29,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4976 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1276, Invalid=15754, Unknown=0, NotChecked=0, Total=17030 [2021-12-06 21:56:29,263 INFO L933 BasicCegarLoop]: 368 mSDtfsCounter, 1431 mSDsluCounter, 7850 mSDsCounter, 0 mSdLazyCounter, 7431 mSolverCounterSat, 420 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1431 SdHoareTripleChecker+Valid, 8218 SdHoareTripleChecker+Invalid, 7851 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 420 IncrementalHoareTripleChecker+Valid, 7431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2021-12-06 21:56:29,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1431 Valid, 8218 Invalid, 7851 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [420 Valid, 7431 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2021-12-06 21:56:29,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1879 states. [2021-12-06 21:56:29,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1879 to 402. [2021-12-06 21:56:29,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 384 states have (on average 1.2395833333333333) internal successors, (476), 386 states have internal predecessors, (476), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:56:29,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 497 transitions. [2021-12-06 21:56:29,420 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 497 transitions. Word has length 57 [2021-12-06 21:56:29,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:56:29,420 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 497 transitions. [2021-12-06 21:56:29,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.1311475409836067) internal successors, (130), 61 states have internal predecessors, (130), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:29,420 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 497 transitions. [2021-12-06 21:56:29,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-12-06 21:56:29,421 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:56:29,421 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:56:29,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-12-06 21:56:29,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-12-06 21:56:29,622 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:56:29,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:56:29,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1062300221, now seen corresponding path program 11 times [2021-12-06 21:56:29,624 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:56:29,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917572750] [2021-12-06 21:56:29,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:29,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:56:29,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:30,266 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 47 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-06 21:56:30,267 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:56:30,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917572750] [2021-12-06 21:56:30,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917572750] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:56:30,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [973968653] [2021-12-06 21:56:30,267 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-06 21:56:30,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:30,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:56:30,268 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:56:30,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-12-06 21:56:34,811 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-12-06 21:56:34,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:56:34,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 74 conjunts are in the unsatisfiable core [2021-12-06 21:56:34,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:56:34,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-12-06 21:56:34,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-12-06 21:56:35,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:56:35,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:56:35,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:56:35,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:56:35,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 21:56:35,446 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 21:56:35,448 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-12-06 21:56:35,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 77 treesize of output 38 [2021-12-06 21:56:35,477 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 62 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-12-06 21:56:35,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:36,297 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 8 proven. 30 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-12-06 21:56:36,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [973968653] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:36,297 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:36,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24, 17] total 45 [2021-12-06 21:56:36,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420512557] [2021-12-06 21:56:36,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:36,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-12-06 21:56:36,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:36,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-12-06 21:56:36,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1762, Unknown=0, NotChecked=0, Total=1980 [2021-12-06 21:56:36,298 INFO L87 Difference]: Start difference. First operand 402 states and 497 transitions. Second operand has 45 states, 45 states have (on average 2.422222222222222) internal successors, (109), 45 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:41,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:56:41,218 INFO L93 Difference]: Finished difference Result 1306 states and 1711 transitions. [2021-12-06 21:56:41,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-12-06 21:56:41,218 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.422222222222222) internal successors, (109), 45 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-12-06 21:56:41,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:56:41,224 INFO L225 Difference]: With dead ends: 1306 [2021-12-06 21:56:41,224 INFO L226 Difference]: Without dead ends: 1272 [2021-12-06 21:56:41,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 85 SyntacticMatches, 7 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1646 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=697, Invalid=6443, Unknown=0, NotChecked=0, Total=7140 [2021-12-06 21:56:41,225 INFO L933 BasicCegarLoop]: 239 mSDtfsCounter, 959 mSDsluCounter, 3787 mSDsCounter, 0 mSdLazyCounter, 3440 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 971 SdHoareTripleChecker+Valid, 4026 SdHoareTripleChecker+Invalid, 3706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 3440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-12-06 21:56:41,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [971 Valid, 4026 Invalid, 3706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 3440 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-12-06 21:56:41,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-12-06 21:56:41,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 414. [2021-12-06 21:56:41,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 396 states have (on average 1.2398989898989898) internal successors, (491), 398 states have internal predecessors, (491), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:56:41,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 512 transitions. [2021-12-06 21:56:41,386 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 512 transitions. Word has length 57 [2021-12-06 21:56:41,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:56:41,387 INFO L470 AbstractCegarLoop]: Abstraction has 414 states and 512 transitions. [2021-12-06 21:56:41,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.422222222222222) internal successors, (109), 45 states have internal predecessors, (109), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:41,387 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 512 transitions. [2021-12-06 21:56:41,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-06 21:56:41,387 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:56:41,388 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 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] [2021-12-06 21:56:41,392 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-12-06 21:56:41,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:41,589 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:56:41,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:56:41,590 INFO L85 PathProgramCache]: Analyzing trace with hash -359161805, now seen corresponding path program 1 times [2021-12-06 21:56:41,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:56:41,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377774627] [2021-12-06 21:56:41,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:41,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:56:41,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:41,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-12-06 21:56:41,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:41,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-12-06 21:56:41,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:41,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-12-06 21:56:41,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:41,790 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-06 21:56:41,790 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:56:41,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377774627] [2021-12-06 21:56:41,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377774627] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:56:41,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185617710] [2021-12-06 21:56:41,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:41,791 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:41,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:56:41,791 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:56:41,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-12-06 21:56:41,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:41,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-06 21:56:41,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:56:42,053 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 19 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-12-06 21:56:42,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:42,279 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-06 21:56:42,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185617710] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:42,279 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:42,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 9] total 21 [2021-12-06 21:56:42,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151085109] [2021-12-06 21:56:42,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:42,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-06 21:56:42,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:42,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-06 21:56:42,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2021-12-06 21:56:42,280 INFO L87 Difference]: Start difference. First operand 414 states and 512 transitions. Second operand has 21 states, 21 states have (on average 3.5238095238095237) internal successors, (74), 21 states have internal predecessors, (74), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-06 21:56:42,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:56:42,919 INFO L93 Difference]: Finished difference Result 477 states and 591 transitions. [2021-12-06 21:56:42,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-12-06 21:56:42,920 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.5238095238095237) internal successors, (74), 21 states have internal predecessors, (74), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 61 [2021-12-06 21:56:42,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:56:42,922 INFO L225 Difference]: With dead ends: 477 [2021-12-06 21:56:42,922 INFO L226 Difference]: Without dead ends: 400 [2021-12-06 21:56:42,922 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 115 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-12-06 21:56:42,923 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 75 mSDsluCounter, 730 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 787 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-06 21:56:42,923 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 787 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-06 21:56:42,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2021-12-06 21:56:43,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 399. [2021-12-06 21:56:43,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 381 states have (on average 1.2388451443569555) internal successors, (472), 383 states have internal predecessors, (472), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:56:43,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 493 transitions. [2021-12-06 21:56:43,066 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 493 transitions. Word has length 61 [2021-12-06 21:56:43,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:56:43,067 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 493 transitions. [2021-12-06 21:56:43,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.5238095238095237) internal successors, (74), 21 states have internal predecessors, (74), 8 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-06 21:56:43,067 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 493 transitions. [2021-12-06 21:56:43,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-06 21:56:43,067 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:56:43,068 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:56:43,087 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-12-06 21:56:43,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:43,269 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:56:43,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:56:43,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1000881506, now seen corresponding path program 2 times [2021-12-06 21:56:43,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:56:43,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672934248] [2021-12-06 21:56:43,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:43,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:56:43,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:43,434 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-06 21:56:43,434 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:56:43,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672934248] [2021-12-06 21:56:43,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672934248] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:56:43,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032894955] [2021-12-06 21:56:43,434 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:56:43,434 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:43,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:56:43,435 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:56:43,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-12-06 21:56:43,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:56:43,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:56:43,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-06 21:56:43,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:56:43,760 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-06 21:56:43,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:44,022 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-06 21:56:44,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032894955] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:44,022 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:44,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2021-12-06 21:56:44,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102270547] [2021-12-06 21:56:44,022 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:44,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-12-06 21:56:44,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:44,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-12-06 21:56:44,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=471, Unknown=0, NotChecked=0, Total=600 [2021-12-06 21:56:44,023 INFO L87 Difference]: Start difference. First operand 399 states and 493 transitions. Second operand has 25 states, 22 states have (on average 3.272727272727273) internal successors, (72), 23 states have internal predecessors, (72), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:45,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:56:45,458 INFO L93 Difference]: Finished difference Result 503 states and 649 transitions. [2021-12-06 21:56:45,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-06 21:56:45,458 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 3.272727272727273) internal successors, (72), 23 states have internal predecessors, (72), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-12-06 21:56:45,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:56:45,460 INFO L225 Difference]: With dead ends: 503 [2021-12-06 21:56:45,460 INFO L226 Difference]: Without dead ends: 468 [2021-12-06 21:56:45,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=239, Invalid=883, Unknown=0, NotChecked=0, Total=1122 [2021-12-06 21:56:45,461 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 293 mSDsluCounter, 864 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 947 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-12-06 21:56:45,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 947 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-12-06 21:56:45,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-12-06 21:56:45,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 459. [2021-12-06 21:56:45,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 441 states have (on average 1.251700680272109) internal successors, (552), 443 states have internal predecessors, (552), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:56:45,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 573 transitions. [2021-12-06 21:56:45,639 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 573 transitions. Word has length 58 [2021-12-06 21:56:45,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:56:45,639 INFO L470 AbstractCegarLoop]: Abstraction has 459 states and 573 transitions. [2021-12-06 21:56:45,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 3.272727272727273) internal successors, (72), 23 states have internal predecessors, (72), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:56:45,639 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 573 transitions. [2021-12-06 21:56:45,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-12-06 21:56:45,640 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:56:45,640 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:56:45,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-12-06 21:56:45,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:45,840 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:56:45,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:56:45,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1331257673, now seen corresponding path program 3 times [2021-12-06 21:56:45,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:56:45,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568255535] [2021-12-06 21:56:45,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:56:45,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:56:45,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:56:46,050 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-12-06 21:56:46,050 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:56:46,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568255535] [2021-12-06 21:56:46,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568255535] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:56:46,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341806568] [2021-12-06 21:56:46,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 21:56:46,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:56:46,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:56:46,052 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:56:46,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-12-06 21:56:47,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-06 21:56:47,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:56:47,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-06 21:56:47,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:56:47,495 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-12-06 21:56:47,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:56:48,004 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-12-06 21:56:48,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341806568] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:56:48,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:56:48,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 28 [2021-12-06 21:56:48,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963317437] [2021-12-06 21:56:48,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:56:48,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-12-06 21:56:48,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:56:48,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-12-06 21:56:48,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=664, Unknown=0, NotChecked=0, Total=756 [2021-12-06 21:56:48,005 INFO L87 Difference]: Start difference. First operand 459 states and 573 transitions. Second operand has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:57:01,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:57:01,576 INFO L93 Difference]: Finished difference Result 2482 states and 3189 transitions. [2021-12-06 21:57:01,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-12-06 21:57:01,576 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-12-06 21:57:01,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:57:01,584 INFO L225 Difference]: With dead ends: 2482 [2021-12-06 21:57:01,584 INFO L226 Difference]: Without dead ends: 2091 [2021-12-06 21:57:01,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 99 SyntacticMatches, 4 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=633, Invalid=3149, Unknown=0, NotChecked=0, Total=3782 [2021-12-06 21:57:01,585 INFO L933 BasicCegarLoop]: 214 mSDtfsCounter, 2506 mSDsluCounter, 2313 mSDsCounter, 0 mSdLazyCounter, 1342 mSolverCounterSat, 487 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2509 SdHoareTripleChecker+Valid, 2527 SdHoareTripleChecker+Invalid, 1829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 487 IncrementalHoareTripleChecker+Valid, 1342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:57:01,585 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2509 Valid, 2527 Invalid, 1829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [487 Valid, 1342 Invalid, 0 Unknown, 0 Unchecked, 7.0s Time] [2021-12-06 21:57:01,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2091 states. [2021-12-06 21:57:01,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2091 to 672. [2021-12-06 21:57:01,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 672 states, 654 states have (on average 1.2584097859327217) internal successors, (823), 656 states have internal predecessors, (823), 11 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-12-06 21:57:01,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 672 states to 672 states and 844 transitions. [2021-12-06 21:57:01,861 INFO L78 Accepts]: Start accepts. Automaton has 672 states and 844 transitions. Word has length 59 [2021-12-06 21:57:01,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:57:01,861 INFO L470 AbstractCegarLoop]: Abstraction has 672 states and 844 transitions. [2021-12-06 21:57:01,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 states have internal predecessors, (88), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:57:01,861 INFO L276 IsEmpty]: Start isEmpty. Operand 672 states and 844 transitions. [2021-12-06 21:57:01,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-12-06 21:57:01,862 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:57:01,862 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-12-06 21:57:01,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-12-06 21:57:02,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-12-06 21:57:02,063 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:57:02,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:57:02,064 INFO L85 PathProgramCache]: Analyzing trace with hash 394119407, now seen corresponding path program 2 times [2021-12-06 21:57:02,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:57:02,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492659294] [2021-12-06 21:57:02,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:57:02,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:57:02,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:02,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-12-06 21:57:02,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:02,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-12-06 21:57:02,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:02,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-12-06 21:57:02,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:02,281 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-12-06 21:57:02,281 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:57:02,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492659294] [2021-12-06 21:57:02,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492659294] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:57:02,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070167405] [2021-12-06 21:57:02,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:57:02,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:02,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:57:02,282 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:57:02,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-12-06 21:57:02,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:57:02,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:57:02,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 35 conjunts are in the unsatisfiable core [2021-12-06 21:57:02,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:57:02,732 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:57:02,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:57:03,253 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 21:57:03,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070167405] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:57:03,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:57:03,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 14] total 35 [2021-12-06 21:57:03,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803479540] [2021-12-06 21:57:03,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:57:03,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-12-06 21:57:03,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:57:03,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-12-06 21:57:03,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1058, Unknown=0, NotChecked=0, Total=1190 [2021-12-06 21:57:03,254 INFO L87 Difference]: Start difference. First operand 672 states and 844 transitions. Second operand has 35 states, 35 states have (on average 3.0) internal successors, (105), 35 states have internal predecessors, (105), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-06 21:57:18,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:57:18,160 INFO L93 Difference]: Finished difference Result 3285 states and 4216 transitions. [2021-12-06 21:57:18,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2021-12-06 21:57:18,161 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0) internal successors, (105), 35 states have internal predecessors, (105), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 63 [2021-12-06 21:57:18,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:57:18,165 INFO L225 Difference]: With dead ends: 3285 [2021-12-06 21:57:18,165 INFO L226 Difference]: Without dead ends: 2931 [2021-12-06 21:57:18,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4525 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=2809, Invalid=13193, Unknown=0, NotChecked=0, Total=16002 [2021-12-06 21:57:18,167 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 2027 mSDsluCounter, 1287 mSDsCounter, 0 mSdLazyCounter, 2000 mSolverCounterSat, 642 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2027 SdHoareTripleChecker+Valid, 1390 SdHoareTripleChecker+Invalid, 2642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 642 IncrementalHoareTripleChecker+Valid, 2000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:57:18,167 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2027 Valid, 1390 Invalid, 2642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [642 Valid, 2000 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-12-06 21:57:18,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2931 states. [2021-12-06 21:57:18,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2931 to 756. [2021-12-06 21:57:18,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 756 states, 729 states have (on average 1.2304526748971194) internal successors, (897), 732 states have internal predecessors, (897), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-06 21:57:18,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 756 states to 756 states and 935 transitions. [2021-12-06 21:57:18,518 INFO L78 Accepts]: Start accepts. Automaton has 756 states and 935 transitions. Word has length 63 [2021-12-06 21:57:18,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:57:18,518 INFO L470 AbstractCegarLoop]: Abstraction has 756 states and 935 transitions. [2021-12-06 21:57:18,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.0) internal successors, (105), 35 states have internal predecessors, (105), 9 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-06 21:57:18,518 INFO L276 IsEmpty]: Start isEmpty. Operand 756 states and 935 transitions. [2021-12-06 21:57:18,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-06 21:57:18,519 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:57:18,519 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:57:18,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-12-06 21:57:18,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:18,721 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:57:18,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:57:18,722 INFO L85 PathProgramCache]: Analyzing trace with hash 1226296938, now seen corresponding path program 12 times [2021-12-06 21:57:18,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:57:18,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109279083] [2021-12-06 21:57:18,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:57:18,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:57:18,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:19,058 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-12-06 21:57:19,059 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:57:19,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109279083] [2021-12-06 21:57:19,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109279083] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:57:19,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379417430] [2021-12-06 21:57:19,059 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-06 21:57:19,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:19,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:57:19,060 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:57:19,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-12-06 21:57:19,251 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-12-06 21:57:19,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:57:19,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 48 conjunts are in the unsatisfiable core [2021-12-06 21:57:19,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:57:19,758 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-12-06 21:57:19,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2021-12-06 21:57:19,794 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-12-06 21:57:19,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:57:20,174 INFO L354 Elim1Store]: treesize reduction 30, result has 73.2 percent of original size [2021-12-06 21:57:20,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:57:20,826 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 15 proven. 28 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-12-06 21:57:20,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379417430] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:57:20,826 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:57:20,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 12] total 36 [2021-12-06 21:57:20,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101636825] [2021-12-06 21:57:20,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:57:20,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-12-06 21:57:20,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:57:20,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-12-06 21:57:20,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1152, Unknown=0, NotChecked=0, Total=1260 [2021-12-06 21:57:20,827 INFO L87 Difference]: Start difference. First operand 756 states and 935 transitions. Second operand has 36 states, 36 states have (on average 3.0) internal successors, (108), 36 states have internal predecessors, (108), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:57:34,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:57:34,650 INFO L93 Difference]: Finished difference Result 2565 states and 3276 transitions. [2021-12-06 21:57:34,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-12-06 21:57:34,650 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0) internal successors, (108), 36 states have internal predecessors, (108), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-12-06 21:57:34,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:57:34,653 INFO L225 Difference]: With dead ends: 2565 [2021-12-06 21:57:34,654 INFO L226 Difference]: Without dead ends: 2148 [2021-12-06 21:57:34,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1062 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=648, Invalid=5052, Unknown=0, NotChecked=0, Total=5700 [2021-12-06 21:57:34,655 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 849 mSDsluCounter, 2738 mSDsCounter, 0 mSdLazyCounter, 2836 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 853 SdHoareTripleChecker+Valid, 2896 SdHoareTripleChecker+Invalid, 3080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 2836 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:57:34,655 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [853 Valid, 2896 Invalid, 3080 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 2836 Invalid, 0 Unknown, 0 Unchecked, 7.1s Time] [2021-12-06 21:57:34,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2148 states. [2021-12-06 21:57:35,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2148 to 838. [2021-12-06 21:57:35,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 838 states, 811 states have (on average 1.2392108508014796) internal successors, (1005), 814 states have internal predecessors, (1005), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-06 21:57:35,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 838 states to 838 states and 1043 transitions. [2021-12-06 21:57:35,045 INFO L78 Accepts]: Start accepts. Automaton has 838 states and 1043 transitions. Word has length 60 [2021-12-06 21:57:35,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:57:35,045 INFO L470 AbstractCegarLoop]: Abstraction has 838 states and 1043 transitions. [2021-12-06 21:57:35,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.0) internal successors, (108), 36 states have internal predecessors, (108), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:57:35,045 INFO L276 IsEmpty]: Start isEmpty. Operand 838 states and 1043 transitions. [2021-12-06 21:57:35,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-12-06 21:57:35,046 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:57:35,046 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:57:35,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-12-06 21:57:35,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:35,248 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:57:35,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:57:35,249 INFO L85 PathProgramCache]: Analyzing trace with hash 1933951093, now seen corresponding path program 4 times [2021-12-06 21:57:35,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:57:35,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249266506] [2021-12-06 21:57:35,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:57:35,250 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:57:35,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:35,823 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 61 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-06 21:57:35,823 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:57:35,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249266506] [2021-12-06 21:57:35,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249266506] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:57:35,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189785471] [2021-12-06 21:57:35,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-06 21:57:35,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:35,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:57:35,824 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:57:35,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-12-06 21:57:35,986 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-06 21:57:35,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:57:35,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 63 conjunts are in the unsatisfiable core [2021-12-06 21:57:35,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:57:36,435 INFO L354 Elim1Store]: treesize reduction 7, result has 56.3 percent of original size [2021-12-06 21:57:36,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 20 [2021-12-06 21:57:36,456 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 73 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-12-06 21:57:36,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:57:36,845 INFO L354 Elim1Store]: treesize reduction 27, result has 73.8 percent of original size [2021-12-06 21:57:36,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 36 treesize of output 83 [2021-12-06 21:57:37,574 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 37 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-12-06 21:57:37,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189785471] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:57:37,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:57:37,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 15] total 50 [2021-12-06 21:57:37,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102604590] [2021-12-06 21:57:37,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:57:37,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-12-06 21:57:37,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:57:37,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-12-06 21:57:37,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2247, Unknown=0, NotChecked=0, Total=2450 [2021-12-06 21:57:37,576 INFO L87 Difference]: Start difference. First operand 838 states and 1043 transitions. Second operand has 50 states, 50 states have (on average 2.64) internal successors, (132), 50 states have internal predecessors, (132), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:57:42,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:57:42,101 INFO L93 Difference]: Finished difference Result 2067 states and 2648 transitions. [2021-12-06 21:57:42,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-12-06 21:57:42,102 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 50 states have internal predecessors, (132), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-12-06 21:57:42,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:57:42,104 INFO L225 Difference]: With dead ends: 2067 [2021-12-06 21:57:42,104 INFO L226 Difference]: Without dead ends: 1889 [2021-12-06 21:57:42,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1603 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=554, Invalid=5926, Unknown=0, NotChecked=0, Total=6480 [2021-12-06 21:57:42,105 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 713 mSDsluCounter, 3417 mSDsCounter, 0 mSdLazyCounter, 2941 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 721 SdHoareTripleChecker+Valid, 3575 SdHoareTripleChecker+Invalid, 3150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 2941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:57:42,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [721 Valid, 3575 Invalid, 3150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 2941 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-12-06 21:57:42,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1889 states. [2021-12-06 21:57:42,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1889 to 889. [2021-12-06 21:57:42,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 889 states, 862 states have (on average 1.2378190255220418) internal successors, (1067), 865 states have internal predecessors, (1067), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-06 21:57:42,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 889 states to 889 states and 1105 transitions. [2021-12-06 21:57:42,526 INFO L78 Accepts]: Start accepts. Automaton has 889 states and 1105 transitions. Word has length 61 [2021-12-06 21:57:42,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:57:42,526 INFO L470 AbstractCegarLoop]: Abstraction has 889 states and 1105 transitions. [2021-12-06 21:57:42,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.64) internal successors, (132), 50 states have internal predecessors, (132), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:57:42,526 INFO L276 IsEmpty]: Start isEmpty. Operand 889 states and 1105 transitions. [2021-12-06 21:57:42,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-12-06 21:57:42,527 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:57:42,527 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:57:42,549 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2021-12-06 21:57:42,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:42,729 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:57:42,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:57:42,730 INFO L85 PathProgramCache]: Analyzing trace with hash -52848528, now seen corresponding path program 13 times [2021-12-06 21:57:42,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:57:42,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428667171] [2021-12-06 21:57:42,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:57:42,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:57:42,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:44,146 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 21:57:44,146 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:57:44,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428667171] [2021-12-06 21:57:44,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428667171] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:57:44,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638834398] [2021-12-06 21:57:44,146 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-06 21:57:44,146 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:57:44,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:57:44,147 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:57:44,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-12-06 21:57:44,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:57:44,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-06 21:57:44,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:57:45,025 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-12-06 21:57:45,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:59:00,890 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 5 proven. 38 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-12-06 21:59:00,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638834398] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:59:00,891 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:59:00,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 14, 14] total 47 [2021-12-06 21:59:00,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168625777] [2021-12-06 21:59:00,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:59:00,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-12-06 21:59:00,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:00,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-12-06 21:59:00,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1992, Unknown=30, NotChecked=0, Total=2162 [2021-12-06 21:59:00,892 INFO L87 Difference]: Start difference. First operand 889 states and 1105 transitions. Second operand has 47 states, 47 states have (on average 2.5319148936170213) internal successors, (119), 47 states have internal predecessors, (119), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:59:55,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:59:55,028 INFO L93 Difference]: Finished difference Result 6653 states and 8535 transitions. [2021-12-06 21:59:55,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 196 states. [2021-12-06 21:59:55,029 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.5319148936170213) internal successors, (119), 47 states have internal predecessors, (119), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-12-06 21:59:55,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:59:55,038 INFO L225 Difference]: With dead ends: 6653 [2021-12-06 21:59:55,038 INFO L226 Difference]: Without dead ends: 6439 [2021-12-06 21:59:55,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17791 ImplicationChecksByTransitivity, 113.7s TimeCoverageRelationStatistics Valid=3505, Invalid=49595, Unknown=30, NotChecked=0, Total=53130 [2021-12-06 21:59:55,042 INFO L933 BasicCegarLoop]: 449 mSDtfsCounter, 4178 mSDsluCounter, 11857 mSDsCounter, 0 mSdLazyCounter, 8470 mSolverCounterSat, 924 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4178 SdHoareTripleChecker+Valid, 12306 SdHoareTripleChecker+Invalid, 11042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 924 IncrementalHoareTripleChecker+Valid, 8470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1648 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:59:55,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4178 Valid, 12306 Invalid, 11042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [924 Valid, 8470 Invalid, 0 Unknown, 1648 Unchecked, 13.1s Time] [2021-12-06 21:59:55,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6439 states. [2021-12-06 21:59:55,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6439 to 772. [2021-12-06 21:59:55,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 772 states, 745 states have (on average 1.229530201342282) internal successors, (916), 748 states have internal predecessors, (916), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-06 21:59:55,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 772 states to 772 states and 954 transitions. [2021-12-06 21:59:55,477 INFO L78 Accepts]: Start accepts. Automaton has 772 states and 954 transitions. Word has length 62 [2021-12-06 21:59:55,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:59:55,477 INFO L470 AbstractCegarLoop]: Abstraction has 772 states and 954 transitions. [2021-12-06 21:59:55,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.5319148936170213) internal successors, (119), 47 states have internal predecessors, (119), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 21:59:55,477 INFO L276 IsEmpty]: Start isEmpty. Operand 772 states and 954 transitions. [2021-12-06 21:59:55,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-06 21:59:55,478 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:59:55,478 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1] [2021-12-06 21:59:55,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-12-06 21:59:55,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-12-06 21:59:55,680 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:59:55,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:59:55,681 INFO L85 PathProgramCache]: Analyzing trace with hash -855991739, now seen corresponding path program 1 times [2021-12-06 21:59:55,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:59:55,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196282311] [2021-12-06 21:59:55,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:55,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:59:55,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:56,103 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-12-06 21:59:56,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:56,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-12-06 21:59:56,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:56,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-12-06 21:59:56,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:56,125 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-12-06 21:59:56,125 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:59:56,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196282311] [2021-12-06 21:59:56,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196282311] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:59:56,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068241378] [2021-12-06 21:59:56,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:56,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:59:56,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:59:56,126 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:59:56,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-12-06 21:59:56,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:56,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 55 conjunts are in the unsatisfiable core [2021-12-06 21:59:56,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:59:56,503 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-12-06 21:59:56,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 10 [2021-12-06 21:59:56,528 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 29 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-12-06 21:59:56,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:59:56,716 INFO L354 Elim1Store]: treesize reduction 30, result has 73.2 percent of original size [2021-12-06 21:59:56,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 21:59:57,149 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-12-06 21:59:57,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2068241378] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:59:57,150 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 21:59:57,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 12] total 38 [2021-12-06 21:59:57,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514889545] [2021-12-06 21:59:57,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 21:59:57,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-12-06 21:59:57,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:57,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-12-06 21:59:57,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1248, Unknown=0, NotChecked=0, Total=1406 [2021-12-06 21:59:57,151 INFO L87 Difference]: Start difference. First operand 772 states and 954 transitions. Second operand has 38 states, 36 states have (on average 3.2222222222222223) internal successors, (116), 38 states have internal predecessors, (116), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-06 21:59:58,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:59:58,978 INFO L93 Difference]: Finished difference Result 1106 states and 1384 transitions. [2021-12-06 21:59:58,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-12-06 21:59:58,978 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 3.2222222222222223) internal successors, (116), 38 states have internal predecessors, (116), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) Word has length 67 [2021-12-06 21:59:58,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:59:58,980 INFO L225 Difference]: With dead ends: 1106 [2021-12-06 21:59:58,980 INFO L226 Difference]: Without dead ends: 1034 [2021-12-06 21:59:58,980 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=276, Invalid=1980, Unknown=0, NotChecked=0, Total=2256 [2021-12-06 21:59:58,980 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 282 mSDsluCounter, 1093 mSDsCounter, 0 mSdLazyCounter, 1112 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 1162 SdHoareTripleChecker+Invalid, 1185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-12-06 21:59:58,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 1162 Invalid, 1185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1112 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-12-06 21:59:58,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1034 states. [2021-12-06 21:59:59,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1034 to 794. [2021-12-06 21:59:59,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 794 states, 763 states have (on average 1.2228047182175623) internal successors, (933), 766 states have internal predecessors, (933), 24 states have call successors, (24), 6 states have call predecessors, (24), 6 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-06 21:59:59,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 794 states to 794 states and 979 transitions. [2021-12-06 21:59:59,407 INFO L78 Accepts]: Start accepts. Automaton has 794 states and 979 transitions. Word has length 67 [2021-12-06 21:59:59,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:59:59,407 INFO L470 AbstractCegarLoop]: Abstraction has 794 states and 979 transitions. [2021-12-06 21:59:59,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 3.2222222222222223) internal successors, (116), 38 states have internal predecessors, (116), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-12-06 21:59:59,408 INFO L276 IsEmpty]: Start isEmpty. Operand 794 states and 979 transitions. [2021-12-06 21:59:59,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-12-06 21:59:59,409 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:59:59,409 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:59:59,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-12-06 21:59:59,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-12-06 21:59:59,610 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:59:59,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:59:59,612 INFO L85 PathProgramCache]: Analyzing trace with hash 1782645332, now seen corresponding path program 1 times [2021-12-06 21:59:59,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:59:59,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378001854] [2021-12-06 21:59:59,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:59,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:59:59,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:00,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-06 22:00:00,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:00,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-12-06 22:00:00,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:00,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-12-06 22:00:00,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:00,061 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 2 proven. 29 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 22:00:00,061 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:00,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378001854] [2021-12-06 22:00:00,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378001854] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:00,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883006882] [2021-12-06 22:00:00,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:00,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:00,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:00,062 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:00,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-12-06 22:00:00,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:00,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-06 22:00:00,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:01,768 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_11| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_11|) 4) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_11|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_11| 8)))) is different from true [2021-12-06 22:00:07,183 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_12| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_12|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_12| 8)) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_12|) 4))) is different from true [2021-12-06 22:00:09,882 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_13| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_13| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_13| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_13|) 4) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_13|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_13| 8)))) is different from true [2021-12-06 22:00:09,985 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-12-06 22:00:09,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 10 [2021-12-06 22:00:10,017 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 5 trivial. 6 not checked. [2021-12-06 22:00:10,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:10,232 INFO L354 Elim1Store]: treesize reduction 28, result has 75.0 percent of original size [2021-12-06 22:00:10,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 22:00:10,873 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-06 22:00:10,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883006882] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:00:10,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 22:00:10,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 22, 15] total 49 [2021-12-06 22:00:10,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380490634] [2021-12-06 22:00:10,874 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 22:00:10,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-12-06 22:00:10,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:10,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-12-06 22:00:10,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1865, Unknown=3, NotChecked=270, Total=2352 [2021-12-06 22:00:10,875 INFO L87 Difference]: Start difference. First operand 794 states and 979 transitions. Second operand has 49 states, 48 states have (on average 3.1458333333333335) internal successors, (151), 47 states have internal predecessors, (151), 10 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-06 22:00:13,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:13,211 INFO L93 Difference]: Finished difference Result 1462 states and 1850 transitions. [2021-12-06 22:00:13,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-12-06 22:00:13,211 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 3.1458333333333335) internal successors, (151), 47 states have internal predecessors, (151), 10 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 68 [2021-12-06 22:00:13,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:13,213 INFO L225 Difference]: With dead ends: 1462 [2021-12-06 22:00:13,213 INFO L226 Difference]: Without dead ends: 1253 [2021-12-06 22:00:13,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 55 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1096 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=301, Invalid=2570, Unknown=3, NotChecked=318, Total=3192 [2021-12-06 22:00:13,214 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 317 mSDsluCounter, 2169 mSDsCounter, 0 mSdLazyCounter, 1566 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 2275 SdHoareTripleChecker+Invalid, 2278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 657 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:13,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [324 Valid, 2275 Invalid, 2278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1566 Invalid, 0 Unknown, 657 Unchecked, 1.2s Time] [2021-12-06 22:00:13,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1253 states. [2021-12-06 22:00:13,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1253 to 808. [2021-12-06 22:00:13,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 808 states, 770 states have (on average 1.2207792207792207) internal successors, (940), 774 states have internal predecessors, (940), 27 states have call successors, (27), 10 states have call predecessors, (27), 10 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2021-12-06 22:00:13,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 808 states to 808 states and 992 transitions. [2021-12-06 22:00:13,649 INFO L78 Accepts]: Start accepts. Automaton has 808 states and 992 transitions. Word has length 68 [2021-12-06 22:00:13,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:13,649 INFO L470 AbstractCegarLoop]: Abstraction has 808 states and 992 transitions. [2021-12-06 22:00:13,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 3.1458333333333335) internal successors, (151), 47 states have internal predecessors, (151), 10 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-06 22:00:13,649 INFO L276 IsEmpty]: Start isEmpty. Operand 808 states and 992 transitions. [2021-12-06 22:00:13,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-12-06 22:00:13,650 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:13,650 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:00:13,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-12-06 22:00:13,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-12-06 22:00:13,851 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:13,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:13,852 INFO L85 PathProgramCache]: Analyzing trace with hash -815603712, now seen corresponding path program 2 times [2021-12-06 22:00:13,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:13,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759453339] [2021-12-06 22:00:13,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:13,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:13,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:14,148 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-06 22:00:14,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:14,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-12-06 22:00:14,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:14,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-12-06 22:00:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:14,167 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 22:00:14,167 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:14,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759453339] [2021-12-06 22:00:14,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759453339] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:14,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836340723] [2021-12-06 22:00:14,167 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 22:00:14,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:14,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:14,168 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:14,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-12-06 22:00:14,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 22:00:14,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:00:14,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 40 conjunts are in the unsatisfiable core [2021-12-06 22:00:14,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:16,698 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-12-06 22:00:16,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 15 [2021-12-06 22:00:16,727 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-06 22:00:16,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:20,268 INFO L354 Elim1Store]: treesize reduction 20, result has 80.0 percent of original size [2021-12-06 22:00:20,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 22:00:20,501 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-12-06 22:00:20,501 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836340723] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:00:20,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 22:00:20,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 10] total 23 [2021-12-06 22:00:20,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80417656] [2021-12-06 22:00:20,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 22:00:20,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-06 22:00:20,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:20,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-06 22:00:20,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=402, Unknown=5, NotChecked=0, Total=506 [2021-12-06 22:00:20,502 INFO L87 Difference]: Start difference. First operand 808 states and 992 transitions. Second operand has 23 states, 21 states have (on average 4.190476190476191) internal successors, (88), 23 states have internal predecessors, (88), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-06 22:00:21,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:21,395 INFO L93 Difference]: Finished difference Result 1038 states and 1293 transitions. [2021-12-06 22:00:21,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-12-06 22:00:21,396 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 4.190476190476191) internal successors, (88), 23 states have internal predecessors, (88), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) Word has length 68 [2021-12-06 22:00:21,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:21,397 INFO L225 Difference]: With dead ends: 1038 [2021-12-06 22:00:21,397 INFO L226 Difference]: Without dead ends: 997 [2021-12-06 22:00:21,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=115, Invalid=480, Unknown=5, NotChecked=0, Total=600 [2021-12-06 22:00:21,398 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 246 mSDsluCounter, 544 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 611 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:21,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 611 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 306 Invalid, 0 Unknown, 29 Unchecked, 0.3s Time] [2021-12-06 22:00:21,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 997 states. [2021-12-06 22:00:21,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 997 to 796. [2021-12-06 22:00:21,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 760 states have (on average 1.2197368421052632) internal successors, (927), 764 states have internal predecessors, (927), 25 states have call successors, (25), 10 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2021-12-06 22:00:21,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 975 transitions. [2021-12-06 22:00:21,825 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 975 transitions. Word has length 68 [2021-12-06 22:00:21,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:21,825 INFO L470 AbstractCegarLoop]: Abstraction has 796 states and 975 transitions. [2021-12-06 22:00:21,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 4.190476190476191) internal successors, (88), 23 states have internal predecessors, (88), 5 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 5 states have call successors, (7) [2021-12-06 22:00:21,825 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 975 transitions. [2021-12-06 22:00:21,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-12-06 22:00:21,826 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:21,826 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 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] [2021-12-06 22:00:21,846 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-12-06 22:00:22,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:22,027 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:22,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:22,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1073222506, now seen corresponding path program 3 times [2021-12-06 22:00:22,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:22,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151269928] [2021-12-06 22:00:22,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:22,028 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:22,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:22,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-12-06 22:00:22,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:22,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-12-06 22:00:22,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:22,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-12-06 22:00:22,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:22,445 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 2 proven. 34 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-12-06 22:00:22,445 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:22,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151269928] [2021-12-06 22:00:22,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151269928] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:22,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608715383] [2021-12-06 22:00:22,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 22:00:22,445 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:22,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:22,446 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:22,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-12-06 22:00:22,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-06 22:00:22,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:00:22,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 11 conjunts are in the unsatisfiable core [2021-12-06 22:00:22,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:23,296 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-12-06 22:00:23,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:23,517 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-12-06 22:00:23,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608715383] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:23,518 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-12-06 22:00:23,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [18, 9] total 27 [2021-12-06 22:00:23,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076488039] [2021-12-06 22:00:23,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 22:00:23,518 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 22:00:23,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:23,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 22:00:23,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=617, Unknown=0, NotChecked=0, Total=702 [2021-12-06 22:00:23,519 INFO L87 Difference]: Start difference. First operand 796 states and 975 transitions. Second operand has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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) [2021-12-06 22:00:24,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:24,171 INFO L93 Difference]: Finished difference Result 837 states and 1023 transitions. [2021-12-06 22:00:24,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 22:00:24,172 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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 68 [2021-12-06 22:00:24,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:24,173 INFO L225 Difference]: With dead ends: 837 [2021-12-06 22:00:24,173 INFO L226 Difference]: Without dead ends: 809 [2021-12-06 22:00:24,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=99, Invalid=713, Unknown=0, NotChecked=0, Total=812 [2021-12-06 22:00:24,174 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 8 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:24,174 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 182 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 22:00:24,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 809 states. [2021-12-06 22:00:24,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 809 to 798. [2021-12-06 22:00:24,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 763 states have (on average 1.2201834862385321) internal successors, (931), 767 states have internal predecessors, (931), 24 states have call successors, (24), 10 states have call predecessors, (24), 10 states have return successors, (22), 20 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-06 22:00:24,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 977 transitions. [2021-12-06 22:00:24,598 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 977 transitions. Word has length 68 [2021-12-06 22:00:24,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:24,598 INFO L470 AbstractCegarLoop]: Abstraction has 798 states and 977 transitions. [2021-12-06 22:00:24,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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) [2021-12-06 22:00:24,598 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 977 transitions. [2021-12-06 22:00:24,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-12-06 22:00:24,599 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:24,599 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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] [2021-12-06 22:00:24,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-12-06 22:00:24,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:24,800 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:24,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:24,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1689329635, now seen corresponding path program 2 times [2021-12-06 22:00:24,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:24,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192698224] [2021-12-06 22:00:24,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:24,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:24,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:24,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-06 22:00:24,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:24,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-12-06 22:00:24,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:24,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-12-06 22:00:24,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:24,899 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-12-06 22:00:24,899 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:24,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192698224] [2021-12-06 22:00:24,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192698224] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 22:00:24,899 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 22:00:24,899 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-06 22:00:24,900 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718260703] [2021-12-06 22:00:24,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 22:00:24,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 22:00:24,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:24,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 22:00:24,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-06 22:00:24,900 INFO L87 Difference]: Start difference. First operand 798 states and 977 transitions. Second operand has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-06 22:00:25,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:25,392 INFO L93 Difference]: Finished difference Result 836 states and 1022 transitions. [2021-12-06 22:00:25,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 22:00:25,393 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-12-06 22:00:25,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:25,394 INFO L225 Difference]: With dead ends: 836 [2021-12-06 22:00:25,394 INFO L226 Difference]: Without dead ends: 803 [2021-12-06 22:00:25,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-06 22:00:25,395 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 12 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:25,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 161 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 22:00:25,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 803 states. [2021-12-06 22:00:25,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 803 to 800. [2021-12-06 22:00:25,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 800 states, 766 states have (on average 1.216710182767624) internal successors, (932), 770 states have internal predecessors, (932), 23 states have call successors, (23), 10 states have call predecessors, (23), 10 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2021-12-06 22:00:25,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 800 states to 800 states and 976 transitions. [2021-12-06 22:00:25,818 INFO L78 Accepts]: Start accepts. Automaton has 800 states and 976 transitions. Word has length 69 [2021-12-06 22:00:25,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:25,818 INFO L470 AbstractCegarLoop]: Abstraction has 800 states and 976 transitions. [2021-12-06 22:00:25,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-12-06 22:00:25,818 INFO L276 IsEmpty]: Start isEmpty. Operand 800 states and 976 transitions. [2021-12-06 22:00:25,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-12-06 22:00:25,819 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:25,819 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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, 1, 1, 1] [2021-12-06 22:00:25,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-12-06 22:00:25,820 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:25,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:25,820 INFO L85 PathProgramCache]: Analyzing trace with hash -220390175, now seen corresponding path program 1 times [2021-12-06 22:00:25,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:25,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828014618] [2021-12-06 22:00:25,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:25,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:26,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-06 22:00:26,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:26,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-12-06 22:00:26,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:26,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-12-06 22:00:26,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:26,199 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-12-06 22:00:26,199 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:26,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828014618] [2021-12-06 22:00:26,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828014618] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:26,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [233408063] [2021-12-06 22:00:26,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:26,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:26,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:26,200 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:26,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-12-06 22:00:26,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:26,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 53 conjunts are in the unsatisfiable core [2021-12-06 22:00:26,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:27,984 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~a~0#1.offset_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_19| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_19|) (+ |v_ULTIMATE.start_main_~a~0#1.offset_BEFORE_CALL_19| 4)) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_19|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_19| 8)))) is different from true [2021-12-06 22:00:34,036 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_20| Int) (|v_ULTIMATE.start_main_~a~0#1.offset_BEFORE_CALL_20| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_20| Int) (|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_20| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_20|) (+ |v_ULTIMATE.start_main_~a~0#1.offset_BEFORE_CALL_20| 4)) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_20|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_20| 8)))) is different from true [2021-12-06 22:00:37,036 WARN L860 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_21| Int) (|v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_21| Int) (|v_ULTIMATE.start_main_~a~0#1.offset_BEFORE_CALL_21| Int) (|v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_21| Int)) (= (select (select |c_#memory_int| |v_ULTIMATE.start_main_~a~0#1.base_BEFORE_CALL_21|) (+ |v_ULTIMATE.start_main_~a~0#1.offset_BEFORE_CALL_21| 4)) (select (select |c_#memory_int| |v_ULTIMATE.start_main_~pat~0#1.base_BEFORE_CALL_21|) (+ |v_ULTIMATE.start_main_~pat~0#1.offset_BEFORE_CALL_21| 8)))) is different from true [2021-12-06 22:00:37,116 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-12-06 22:00:37,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 10 [2021-12-06 22:00:37,155 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 5 trivial. 8 not checked. [2021-12-06 22:00:37,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:37,364 INFO L354 Elim1Store]: treesize reduction 28, result has 75.0 percent of original size [2021-12-06 22:00:37,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 22:00:38,098 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 24 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-12-06 22:00:38,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [233408063] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:00:38,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 22:00:38,098 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 15] total 47 [2021-12-06 22:00:38,098 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807022516] [2021-12-06 22:00:38,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 22:00:38,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-12-06 22:00:38,099 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:38,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-12-06 22:00:38,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1727, Unknown=3, NotChecked=258, Total=2162 [2021-12-06 22:00:38,099 INFO L87 Difference]: Start difference. First operand 800 states and 976 transitions. Second operand has 47 states, 46 states have (on average 3.130434782608696) internal successors, (144), 45 states have internal predecessors, (144), 9 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-12-06 22:00:46,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:46,122 INFO L93 Difference]: Finished difference Result 1267 states and 1596 transitions. [2021-12-06 22:00:46,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-12-06 22:00:46,122 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 3.130434782608696) internal successors, (144), 45 states have internal predecessors, (144), 9 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 70 [2021-12-06 22:00:46,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:46,124 INFO L225 Difference]: With dead ends: 1267 [2021-12-06 22:00:46,124 INFO L226 Difference]: Without dead ends: 1227 [2021-12-06 22:00:46,124 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 115 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 17.4s TimeCoverageRelationStatistics Valid=252, Invalid=2510, Unknown=6, NotChecked=312, Total=3080 [2021-12-06 22:00:46,125 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 334 mSDsluCounter, 2094 mSDsCounter, 0 mSdLazyCounter, 1549 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 2199 SdHoareTripleChecker+Invalid, 2256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 644 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:46,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [341 Valid, 2199 Invalid, 2256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1549 Invalid, 0 Unknown, 644 Unchecked, 1.1s Time] [2021-12-06 22:00:46,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1227 states. [2021-12-06 22:00:46,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1227 to 767. [2021-12-06 22:00:46,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 767 states, 737 states have (on average 1.2252374491180462) internal successors, (903), 739 states have internal predecessors, (903), 19 states have call successors, (19), 10 states have call predecessors, (19), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-06 22:00:46,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 767 states to 767 states and 940 transitions. [2021-12-06 22:00:46,548 INFO L78 Accepts]: Start accepts. Automaton has 767 states and 940 transitions. Word has length 70 [2021-12-06 22:00:46,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:46,548 INFO L470 AbstractCegarLoop]: Abstraction has 767 states and 940 transitions. [2021-12-06 22:00:46,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 3.130434782608696) internal successors, (144), 45 states have internal predecessors, (144), 9 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-12-06 22:00:46,548 INFO L276 IsEmpty]: Start isEmpty. Operand 767 states and 940 transitions. [2021-12-06 22:00:46,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-06 22:00:46,549 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:46,549 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:00:46,568 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-12-06 22:00:46,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:46,750 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:46,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:46,751 INFO L85 PathProgramCache]: Analyzing trace with hash -31418675, now seen corresponding path program 14 times [2021-12-06 22:00:46,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:46,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789760892] [2021-12-06 22:00:46,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:46,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:46,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:47,522 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-06 22:00:47,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:47,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789760892] [2021-12-06 22:00:47,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789760892] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:47,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248238243] [2021-12-06 22:00:47,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 22:00:47,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:47,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:47,523 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:47,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-12-06 22:00:48,134 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 22:00:48,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:00:48,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 77 conjunts are in the unsatisfiable core [2021-12-06 22:00:48,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:49,026 INFO L354 Elim1Store]: treesize reduction 3, result has 78.6 percent of original size [2021-12-06 22:00:49,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 22 [2021-12-06 22:00:49,050 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 9 proven. 101 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-12-06 22:00:49,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:49,714 INFO L354 Elim1Store]: treesize reduction 26, result has 76.8 percent of original size [2021-12-06 22:00:49,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 [2021-12-06 22:00:50,936 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 9 proven. 53 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-12-06 22:00:50,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248238243] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:00:50,936 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 22:00:50,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 27, 18] total 65 [2021-12-06 22:00:50,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474761598] [2021-12-06 22:00:50,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 22:00:50,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-12-06 22:00:50,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:50,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-12-06 22:00:50,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=3840, Unknown=0, NotChecked=0, Total=4160 [2021-12-06 22:00:50,937 INFO L87 Difference]: Start difference. First operand 767 states and 940 transitions. Second operand has 65 states, 65 states have (on average 2.4461538461538463) internal successors, (159), 65 states have internal predecessors, (159), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 22:00:58,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:58,434 INFO L93 Difference]: Finished difference Result 2445 states and 3101 transitions. [2021-12-06 22:00:58,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-12-06 22:00:58,435 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.4461538461538463) internal successors, (159), 65 states have internal predecessors, (159), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-12-06 22:00:58,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:58,440 INFO L225 Difference]: With dead ends: 2445 [2021-12-06 22:00:58,441 INFO L226 Difference]: Without dead ends: 2255 [2021-12-06 22:00:58,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3327 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=901, Invalid=11089, Unknown=0, NotChecked=0, Total=11990 [2021-12-06 22:00:58,442 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 1168 mSDsluCounter, 4448 mSDsCounter, 0 mSdLazyCounter, 4293 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1180 SdHoareTripleChecker+Valid, 4639 SdHoareTripleChecker+Invalid, 4463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 4293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:58,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1180 Valid, 4639 Invalid, 4463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 4293 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-12-06 22:00:58,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2255 states. [2021-12-06 22:00:58,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2255 to 777. [2021-12-06 22:00:58,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 777 states, 747 states have (on average 1.2248995983935742) internal successors, (915), 749 states have internal predecessors, (915), 19 states have call successors, (19), 10 states have call predecessors, (19), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-12-06 22:00:58,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 777 states to 777 states and 952 transitions. [2021-12-06 22:00:58,870 INFO L78 Accepts]: Start accepts. Automaton has 777 states and 952 transitions. Word has length 67 [2021-12-06 22:00:58,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:58,870 INFO L470 AbstractCegarLoop]: Abstraction has 777 states and 952 transitions. [2021-12-06 22:00:58,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.4461538461538463) internal successors, (159), 65 states have internal predecessors, (159), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 22:00:58,871 INFO L276 IsEmpty]: Start isEmpty. Operand 777 states and 952 transitions. [2021-12-06 22:00:58,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-12-06 22:00:58,872 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:58,872 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:00:58,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-12-06 22:00:59,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-12-06 22:00:59,072 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:59,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:59,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1736808219, now seen corresponding path program 15 times [2021-12-06 22:00:59,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:59,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243384026] [2021-12-06 22:00:59,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:59,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:59,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:00:59,864 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 9 proven. 78 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-12-06 22:00:59,864 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:59,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243384026] [2021-12-06 22:00:59,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243384026] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:00:59,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769493853] [2021-12-06 22:00:59,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 22:00:59,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:59,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:59,865 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:59,866 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ee29368a-89a8-4b1c-a0e6-150599cbf32b/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-12-06 22:01:02,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-12-06 22:01:02,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:01:02,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 110 conjunts are in the unsatisfiable core [2021-12-06 22:01:02,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:01:02,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-12-06 22:01:03,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-12-06 22:01:03,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 22:01:03,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 22:01:03,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 22:01:03,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 22:01:03,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-12-06 22:01:05,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 22:01:05,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-12-06 22:01:05,618 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 22:01:05,619 INFO L173 IndexEqualityManager]: detected equality via solver [2021-12-06 22:01:05,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 35 [2021-12-06 22:01:05,707 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 9 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-06 22:01:05,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:01:10,545 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 1 proven. 61 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-12-06 22:01:10,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769493853] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:01:10,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-06 22:01:10,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 33, 25] total 79 [2021-12-06 22:01:10,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766778888] [2021-12-06 22:01:10,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-06 22:01:10,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-12-06 22:01:10,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:01:10,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-12-06 22:01:10,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=5585, Unknown=0, NotChecked=0, Total=6162 [2021-12-06 22:01:10,547 INFO L87 Difference]: Start difference. First operand 777 states and 952 transitions. Second operand has 79 states, 78 states have (on average 2.1153846153846154) internal successors, (165), 78 states have internal predecessors, (165), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-12-06 22:02:04,584 WARN L227 SmtUtils]: Spent 6.68s on a formula simplification. DAG size of input: 157 DAG size of output: 122 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:02:37,499 WARN L227 SmtUtils]: Spent 6.30s on a formula simplification. DAG size of input: 155 DAG size of output: 120 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:02:57,910 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-06 22:03:17,475 WARN L227 SmtUtils]: Spent 9.40s on a formula simplification. DAG size of input: 154 DAG size of output: 119 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:06:18,847 WARN L227 SmtUtils]: Spent 10.03s on a formula simplification. DAG size of input: 148 DAG size of output: 119 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:06:24,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-06 22:06:25,876 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.09s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-12-06 22:06:32,245 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers []