./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/heap-manipulation/dancing.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/config/AutomizerReach.xml -i ../../sv-benchmarks/c/heap-manipulation/dancing.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc --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 c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-5e519f3 [2022-11-02 21:07:28,057 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-02 21:07:28,059 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-02 21:07:28,086 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-02 21:07:28,086 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-02 21:07:28,087 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-02 21:07:28,089 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-02 21:07:28,091 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-02 21:07:28,092 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-02 21:07:28,093 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-02 21:07:28,094 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-02 21:07:28,096 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-02 21:07:28,096 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-02 21:07:28,097 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-02 21:07:28,099 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-02 21:07:28,100 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-02 21:07:28,101 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-02 21:07:28,102 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-02 21:07:28,103 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-02 21:07:28,105 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-02 21:07:28,107 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-02 21:07:28,108 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-02 21:07:28,110 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-02 21:07:28,111 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-02 21:07:28,114 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-02 21:07:28,115 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-02 21:07:28,115 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-02 21:07:28,116 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-02 21:07:28,117 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-02 21:07:28,118 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-02 21:07:28,118 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-02 21:07:28,119 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-02 21:07:28,120 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-02 21:07:28,121 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-02 21:07:28,122 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-02 21:07:28,122 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-02 21:07:28,123 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-02 21:07:28,123 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-02 21:07:28,124 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-02 21:07:28,125 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-02 21:07:28,125 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-02 21:07:28,126 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-11-02 21:07:28,156 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-02 21:07:28,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-02 21:07:28,156 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-02 21:07:28,157 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-02 21:07:28,157 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-02 21:07:28,157 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-02 21:07:28,158 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-02 21:07:28,158 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-02 21:07:28,159 INFO L138 SettingsManager]: * Use SBE=true [2022-11-02 21:07:28,159 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-02 21:07:28,159 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-02 21:07:28,159 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-02 21:07:28,159 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-02 21:07:28,160 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-02 21:07:28,160 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-02 21:07:28,160 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-02 21:07:28,160 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-02 21:07:28,160 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-02 21:07:28,161 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-02 21:07:28,161 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-02 21:07:28,161 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-02 21:07:28,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-02 21:07:28,173 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-11-02 21:07:28,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-02 21:07:28,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-02 21:07:28,173 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-02 21:07:28,173 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-02 21:07:28,174 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-02 21:07:28,174 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-11-02 21:07:28,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-02 21:07:28,174 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-11-02 21:07:28,174 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-11-02 21:07:28,174 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-02 21:07:28,175 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_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a [2022-11-02 21:07:28,430 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-02 21:07:28,454 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-02 21:07:28,457 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-02 21:07:28,458 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-02 21:07:28,459 INFO L275 PluginConnector]: CDTParser initialized [2022-11-02 21:07:28,460 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/../../sv-benchmarks/c/heap-manipulation/dancing.i [2022-11-02 21:07:28,543 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/data/83b931589/6011ea63c2b84e19a2db7fce7f9c9389/FLAG40e76e524 [2022-11-02 21:07:29,158 INFO L306 CDTParser]: Found 1 translation units. [2022-11-02 21:07:29,159 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/sv-benchmarks/c/heap-manipulation/dancing.i [2022-11-02 21:07:29,171 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/data/83b931589/6011ea63c2b84e19a2db7fce7f9c9389/FLAG40e76e524 [2022-11-02 21:07:29,424 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/data/83b931589/6011ea63c2b84e19a2db7fce7f9c9389 [2022-11-02 21:07:29,427 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-02 21:07:29,428 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-02 21:07:29,429 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-02 21:07:29,430 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-02 21:07:29,435 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-02 21:07:29,436 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 09:07:29" (1/1) ... [2022-11-02 21:07:29,439 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@10d5f37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:29, skipping insertion in model container [2022-11-02 21:07:29,439 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 09:07:29" (1/1) ... [2022-11-02 21:07:29,446 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-02 21:07:29,505 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-02 21:07:29,736 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_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2022-11-02 21:07:29,920 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-02 21:07:29,932 INFO L203 MainTranslator]: Completed pre-run [2022-11-02 21:07:29,952 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_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2022-11-02 21:07:30,012 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-02 21:07:30,042 INFO L208 MainTranslator]: Completed translation [2022-11-02 21:07:30,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30 WrapperNode [2022-11-02 21:07:30,043 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-02 21:07:30,044 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-02 21:07:30,044 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-02 21:07:30,044 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-02 21:07:30,052 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,081 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,115 INFO L138 Inliner]: procedures = 124, calls = 40, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 90 [2022-11-02 21:07:30,116 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-02 21:07:30,117 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-02 21:07:30,117 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-02 21:07:30,117 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-02 21:07:30,127 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,139 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,140 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,156 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,168 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,176 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,179 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-02 21:07:30,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-02 21:07:30,184 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-02 21:07:30,185 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-02 21:07:30,186 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (1/1) ... [2022-11-02 21:07:30,194 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-02 21:07:30,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:07:30,227 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-02 21:07:30,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-02 21:07:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2022-11-02 21:07:30,274 INFO L138 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2022-11-02 21:07:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-02 21:07:30,274 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-02 21:07:30,274 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-02 21:07:30,275 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-02 21:07:30,275 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-02 21:07:30,392 INFO L235 CfgBuilder]: Building ICFG [2022-11-02 21:07:30,394 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-02 21:07:30,754 INFO L276 CfgBuilder]: Performing block encoding [2022-11-02 21:07:30,771 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-02 21:07:30,771 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-02 21:07:30,773 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 09:07:30 BoogieIcfgContainer [2022-11-02 21:07:30,773 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-02 21:07:30,776 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-02 21:07:30,776 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-02 21:07:30,784 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-02 21:07:30,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 09:07:29" (1/3) ... [2022-11-02 21:07:30,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a1b2477 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 09:07:30, skipping insertion in model container [2022-11-02 21:07:30,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 09:07:30" (2/3) ... [2022-11-02 21:07:30,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a1b2477 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 09:07:30, skipping insertion in model container [2022-11-02 21:07:30,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 09:07:30" (3/3) ... [2022-11-02 21:07:30,787 INFO L112 eAbstractionObserver]: Analyzing ICFG dancing.i [2022-11-02 21:07:30,807 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-02 21:07:30,808 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-02 21:07:30,870 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-02 21:07:30,877 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4dc72c2b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-02 21:07:30,877 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-02 21:07:30,881 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 31 states have (on average 1.4516129032258065) internal successors, (45), 32 states have internal predecessors, (45), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-02 21:07:30,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-02 21:07:30,890 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:30,891 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:30,892 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:30,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:30,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1472755522, now seen corresponding path program 1 times [2022-11-02 21:07:30,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:30,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452795239] [2022-11-02 21:07:30,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:30,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:31,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,098 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:31,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-02 21:07:31,143 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:31,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452795239] [2022-11-02 21:07:31,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452795239] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:31,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:31,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-02 21:07:31,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778913819] [2022-11-02 21:07:31,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:31,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-02 21:07:31,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:31,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-02 21:07:31,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-02 21:07:31,196 INFO L87 Difference]: Start difference. First operand has 41 states, 31 states have (on average 1.4516129032258065) internal successors, (45), 32 states have internal predecessors, (45), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 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) [2022-11-02 21:07:31,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:31,221 INFO L93 Difference]: Finished difference Result 77 states and 107 transitions. [2022-11-02 21:07:31,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-02 21:07:31,226 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-11-02 21:07:31,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:31,234 INFO L225 Difference]: With dead ends: 77 [2022-11-02 21:07:31,234 INFO L226 Difference]: Without dead ends: 37 [2022-11-02 21:07:31,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-02 21:07:31,243 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:31,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-02 21:07:31,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-02 21:07:31,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-11-02 21:07:31,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 29 states have internal predecessors, (39), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-02 21:07:31,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 50 transitions. [2022-11-02 21:07:31,310 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 50 transitions. Word has length 20 [2022-11-02 21:07:31,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:31,310 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 50 transitions. [2022-11-02 21:07:31,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 8.5) internal successors, (17), 2 states have internal predecessors, (17), 1 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) [2022-11-02 21:07:31,312 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 50 transitions. [2022-11-02 21:07:31,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-02 21:07:31,317 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:31,318 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:31,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-02 21:07:31,318 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:31,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:31,320 INFO L85 PathProgramCache]: Analyzing trace with hash -751028367, now seen corresponding path program 1 times [2022-11-02 21:07:31,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:31,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501486671] [2022-11-02 21:07:31,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:31,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:31,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:31,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,592 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-02 21:07:31,593 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:31,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501486671] [2022-11-02 21:07:31,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501486671] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:31,593 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:31,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-02 21:07:31,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670393982] [2022-11-02 21:07:31,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:31,595 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-02 21:07:31,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:31,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-02 21:07:31,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-02 21:07:31,597 INFO L87 Difference]: Start difference. First operand 37 states and 50 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-02 21:07:31,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:31,644 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2022-11-02 21:07:31,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-02 21:07:31,645 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-11-02 21:07:31,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:31,646 INFO L225 Difference]: With dead ends: 45 [2022-11-02 21:07:31,646 INFO L226 Difference]: Without dead ends: 43 [2022-11-02 21:07:31,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-02 21:07:31,648 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:31,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 181 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-02 21:07:31,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-02 21:07:31,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2022-11-02 21:07:31,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 33 states have internal predecessors, (42), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-02 21:07:31,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2022-11-02 21:07:31,656 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 20 [2022-11-02 21:07:31,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:31,658 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2022-11-02 21:07:31,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-02 21:07:31,658 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2022-11-02 21:07:31,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-02 21:07:31,659 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:31,659 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:31,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-02 21:07:31,660 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:31,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:31,660 INFO L85 PathProgramCache]: Analyzing trace with hash 789210768, now seen corresponding path program 1 times [2022-11-02 21:07:31,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:31,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407327710] [2022-11-02 21:07:31,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:31,661 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:31,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:31,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,779 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-11-02 21:07:31,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:31,785 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-02 21:07:31,785 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:31,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407327710] [2022-11-02 21:07:31,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407327710] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:31,786 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:31,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-02 21:07:31,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469290226] [2022-11-02 21:07:31,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:31,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-02 21:07:31,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:31,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-02 21:07:31,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-02 21:07:31,788 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 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) [2022-11-02 21:07:31,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:31,841 INFO L93 Difference]: Finished difference Result 86 states and 116 transitions. [2022-11-02 21:07:31,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-02 21:07:31,842 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 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 26 [2022-11-02 21:07:31,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:31,843 INFO L225 Difference]: With dead ends: 86 [2022-11-02 21:07:31,843 INFO L226 Difference]: Without dead ends: 63 [2022-11-02 21:07:31,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-02 21:07:31,845 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 15 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:31,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 134 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-02 21:07:31,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-02 21:07:31,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 54. [2022-11-02 21:07:31,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.380952380952381) internal successors, (58), 44 states have internal predecessors, (58), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-02 21:07:31,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 73 transitions. [2022-11-02 21:07:31,856 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 73 transitions. Word has length 26 [2022-11-02 21:07:31,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:31,856 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 73 transitions. [2022-11-02 21:07:31,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 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) [2022-11-02 21:07:31,857 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 73 transitions. [2022-11-02 21:07:31,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-02 21:07:31,858 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:31,858 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:31,859 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-02 21:07:31,859 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:31,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:31,859 INFO L85 PathProgramCache]: Analyzing trace with hash 860755832, now seen corresponding path program 1 times [2022-11-02 21:07:31,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:31,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91777127] [2022-11-02 21:07:31,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:31,860 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:31,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:32,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:07:32,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:32,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2022-11-02 21:07:32,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:32,217 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-02 21:07:32,217 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:32,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91777127] [2022-11-02 21:07:32,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91777127] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:07:32,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890891021] [2022-11-02 21:07:32,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:32,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:07:32,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:07:32,224 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:07:32,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-02 21:07:32,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:32,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-02 21:07:32,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:07:32,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-02 21:07:32,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:07:32,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-02 21:07:32,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890891021] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:07:32,695 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:07:32,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2022-11-02 21:07:32,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282662758] [2022-11-02 21:07:32,696 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:07:32,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-02 21:07:32,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:32,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-02 21:07:32,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2022-11-02 21:07:32,698 INFO L87 Difference]: Start difference. First operand 54 states and 73 transitions. Second operand has 16 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 1 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-02 21:07:33,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:33,069 INFO L93 Difference]: Finished difference Result 118 states and 165 transitions. [2022-11-02 21:07:33,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-02 21:07:33,069 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 1 states have call predecessors, (5), 4 states have call successors, (5) Word has length 29 [2022-11-02 21:07:33,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:33,077 INFO L225 Difference]: With dead ends: 118 [2022-11-02 21:07:33,077 INFO L226 Difference]: Without dead ends: 82 [2022-11-02 21:07:33,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-11-02 21:07:33,087 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 132 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:33,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 338 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-02 21:07:33,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-02 21:07:33,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 63. [2022-11-02 21:07:33,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 48 states have (on average 1.375) internal successors, (66), 52 states have internal predecessors, (66), 10 states have call successors, (10), 3 states have call predecessors, (10), 4 states have return successors, (12), 7 states have call predecessors, (12), 9 states have call successors, (12) [2022-11-02 21:07:33,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 88 transitions. [2022-11-02 21:07:33,116 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 88 transitions. Word has length 29 [2022-11-02 21:07:33,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:33,117 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 88 transitions. [2022-11-02 21:07:33,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (5), 1 states have call predecessors, (5), 4 states have call successors, (5) [2022-11-02 21:07:33,118 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 88 transitions. [2022-11-02 21:07:33,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-02 21:07:33,121 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:33,122 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:33,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-02 21:07:33,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:07:33,337 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:33,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:33,338 INFO L85 PathProgramCache]: Analyzing trace with hash 162961828, now seen corresponding path program 1 times [2022-11-02 21:07:33,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:33,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524674169] [2022-11-02 21:07:33,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:33,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:33,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:07:33,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,589 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-11-02 21:07:33,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-02 21:07:33,608 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:33,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524674169] [2022-11-02 21:07:33,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524674169] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:33,609 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:33,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-02 21:07:33,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126871107] [2022-11-02 21:07:33,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:33,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-02 21:07:33,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:33,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-02 21:07:33,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-02 21:07:33,611 INFO L87 Difference]: Start difference. First operand 63 states and 88 transitions. Second operand has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-02 21:07:33,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:33,683 INFO L93 Difference]: Finished difference Result 75 states and 105 transitions. [2022-11-02 21:07:33,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-02 21:07:33,683 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2022-11-02 21:07:33,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:33,684 INFO L225 Difference]: With dead ends: 75 [2022-11-02 21:07:33,684 INFO L226 Difference]: Without dead ends: 73 [2022-11-02 21:07:33,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-02 21:07:33,686 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 7 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:33,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 289 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-02 21:07:33,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-11-02 21:07:33,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2022-11-02 21:07:33,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.3396226415094339) internal successors, (71), 58 states have internal predecessors, (71), 11 states have call successors, (11), 4 states have call predecessors, (11), 6 states have return successors, (19), 8 states have call predecessors, (19), 10 states have call successors, (19) [2022-11-02 21:07:33,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 101 transitions. [2022-11-02 21:07:33,706 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 101 transitions. Word has length 31 [2022-11-02 21:07:33,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:33,707 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 101 transitions. [2022-11-02 21:07:33,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-02 21:07:33,707 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 101 transitions. [2022-11-02 21:07:33,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-02 21:07:33,709 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:33,709 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:33,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-02 21:07:33,709 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:33,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:33,710 INFO L85 PathProgramCache]: Analyzing trace with hash 786337177, now seen corresponding path program 1 times [2022-11-02 21:07:33,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:33,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874429786] [2022-11-02 21:07:33,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:33,711 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:33,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:07:33,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-11-02 21:07:33,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:33,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:33,910 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-02 21:07:33,910 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:33,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874429786] [2022-11-02 21:07:33,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874429786] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:07:33,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764898249] [2022-11-02 21:07:33,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:33,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:07:33,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:07:33,912 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:07:33,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-02 21:07:34,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:34,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-02 21:07:34,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:07:34,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:34,171 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:07:34,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:34,188 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:07:34,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:34,205 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-02 21:07:34,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:34,220 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-02 21:07:34,445 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-11-02 21:07:34,454 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-11-02 21:07:34,477 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-02 21:07:34,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:07:34,552 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:07:34,701 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:07:34,702 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 31 [2022-11-02 21:07:34,708 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 36 treesize of output 24 [2022-11-02 21:07:34,712 INFO L390 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 7 treesize of output 3 [2022-11-02 21:07:34,723 INFO L356 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-11-02 21:07:34,724 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 25 treesize of output 1 [2022-11-02 21:07:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-02 21:07:34,757 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764898249] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:07:34,758 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:07:34,758 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 7] total 16 [2022-11-02 21:07:34,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797937090] [2022-11-02 21:07:34,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:07:34,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-02 21:07:34,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:34,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-02 21:07:34,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2022-11-02 21:07:34,761 INFO L87 Difference]: Start difference. First operand 71 states and 101 transitions. Second operand has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-02 21:07:35,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:35,530 INFO L93 Difference]: Finished difference Result 269 states and 401 transitions. [2022-11-02 21:07:35,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-02 21:07:35,531 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 37 [2022-11-02 21:07:35,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:35,534 INFO L225 Difference]: With dead ends: 269 [2022-11-02 21:07:35,534 INFO L226 Difference]: Without dead ends: 198 [2022-11-02 21:07:35,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2022-11-02 21:07:35,536 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 193 mSDsluCounter, 778 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 881 SdHoareTripleChecker+Invalid, 485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:35,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [199 Valid, 881 Invalid, 485 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 381 Invalid, 0 Unknown, 55 Unchecked, 0.4s Time] [2022-11-02 21:07:35,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-11-02 21:07:35,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 90. [2022-11-02 21:07:35,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 74 states have internal predecessors, (92), 13 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) [2022-11-02 21:07:35,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 125 transitions. [2022-11-02 21:07:35,561 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 125 transitions. Word has length 37 [2022-11-02 21:07:35,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:35,561 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 125 transitions. [2022-11-02 21:07:35,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.4375) internal successors, (55), 15 states have internal predecessors, (55), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-02 21:07:35,562 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 125 transitions. [2022-11-02 21:07:35,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-02 21:07:35,563 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:35,564 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:35,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-02 21:07:35,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:07:35,789 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:35,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:35,789 INFO L85 PathProgramCache]: Analyzing trace with hash -1693334873, now seen corresponding path program 1 times [2022-11-02 21:07:35,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:35,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729262732] [2022-11-02 21:07:35,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:35,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:35,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:36,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-11-02 21:07:36,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:07:36,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,094 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-02 21:07:36,094 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:36,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729262732] [2022-11-02 21:07:36,095 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729262732] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:36,095 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:36,095 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-02 21:07:36,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019247908] [2022-11-02 21:07:36,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:36,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-02 21:07:36,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:36,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-02 21:07:36,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-02 21:07:36,097 INFO L87 Difference]: Start difference. First operand 90 states and 125 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-02 21:07:36,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:36,251 INFO L93 Difference]: Finished difference Result 133 states and 181 transitions. [2022-11-02 21:07:36,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-02 21:07:36,252 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 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 35 [2022-11-02 21:07:36,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:36,254 INFO L225 Difference]: With dead ends: 133 [2022-11-02 21:07:36,254 INFO L226 Difference]: Without dead ends: 102 [2022-11-02 21:07:36,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-02 21:07:36,255 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 20 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:36,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 165 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-02 21:07:36,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-02 21:07:36,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2022-11-02 21:07:36,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 71 states have (on average 1.323943661971831) internal successors, (94), 76 states have internal predecessors, (94), 13 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (20), 10 states have call predecessors, (20), 12 states have call successors, (20) [2022-11-02 21:07:36,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 127 transitions. [2022-11-02 21:07:36,273 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 127 transitions. Word has length 35 [2022-11-02 21:07:36,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:36,273 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 127 transitions. [2022-11-02 21:07:36,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-02 21:07:36,274 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 127 transitions. [2022-11-02 21:07:36,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-02 21:07:36,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:36,275 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:36,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-02 21:07:36,276 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:36,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:36,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1474480155, now seen corresponding path program 1 times [2022-11-02 21:07:36,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:36,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635605982] [2022-11-02 21:07:36,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:36,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:36,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:36,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-11-02 21:07:36,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:07:36,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,391 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-02 21:07:36,391 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:36,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635605982] [2022-11-02 21:07:36,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635605982] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:36,392 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:36,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-02 21:07:36,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204475697] [2022-11-02 21:07:36,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:36,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-02 21:07:36,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:36,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-02 21:07:36,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-02 21:07:36,394 INFO L87 Difference]: Start difference. First operand 92 states and 127 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-02 21:07:36,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:36,439 INFO L93 Difference]: Finished difference Result 99 states and 133 transitions. [2022-11-02 21:07:36,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-02 21:07:36,440 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2022-11-02 21:07:36,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:36,441 INFO L225 Difference]: With dead ends: 99 [2022-11-02 21:07:36,441 INFO L226 Difference]: Without dead ends: 92 [2022-11-02 21:07:36,441 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-02 21:07:36,442 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 5 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:36,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 237 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-02 21:07:36,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-02 21:07:36,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2022-11-02 21:07:36,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 66 states have internal predecessors, (84), 10 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (15), 9 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-02 21:07:36,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 109 transitions. [2022-11-02 21:07:36,456 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 109 transitions. Word has length 35 [2022-11-02 21:07:36,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:36,456 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 109 transitions. [2022-11-02 21:07:36,456 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-02 21:07:36,457 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 109 transitions. [2022-11-02 21:07:36,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-02 21:07:36,458 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:36,458 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:07:36,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-02 21:07:36,459 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:36,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:36,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1846747895, now seen corresponding path program 1 times [2022-11-02 21:07:36,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:36,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646902542] [2022-11-02 21:07:36,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:36,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:36,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:36,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-11-02 21:07:36,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:07:36,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-02 21:07:36,668 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:36,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646902542] [2022-11-02 21:07:36,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646902542] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:07:36,669 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:07:36,669 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-02 21:07:36,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726610743] [2022-11-02 21:07:36,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:07:36,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-02 21:07:36,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:36,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-02 21:07:36,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-02 21:07:36,672 INFO L87 Difference]: Start difference. First operand 80 states and 109 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-02 21:07:36,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:36,759 INFO L93 Difference]: Finished difference Result 130 states and 171 transitions. [2022-11-02 21:07:36,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-02 21:07:36,760 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2022-11-02 21:07:36,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:36,761 INFO L225 Difference]: With dead ends: 130 [2022-11-02 21:07:36,761 INFO L226 Difference]: Without dead ends: 62 [2022-11-02 21:07:36,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-02 21:07:36,763 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 16 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:36,763 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 144 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-02 21:07:36,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-02 21:07:36,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2022-11-02 21:07:36,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 48 states have internal predecessors, (60), 8 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (11), 7 states have call predecessors, (11), 7 states have call successors, (11) [2022-11-02 21:07:36,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 79 transitions. [2022-11-02 21:07:36,780 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 79 transitions. Word has length 36 [2022-11-02 21:07:36,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:36,781 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 79 transitions. [2022-11-02 21:07:36,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-02 21:07:36,781 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 79 transitions. [2022-11-02 21:07:36,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-02 21:07:36,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:36,782 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 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] [2022-11-02 21:07:36,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-02 21:07:36,784 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:36,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:36,784 INFO L85 PathProgramCache]: Analyzing trace with hash -827934680, now seen corresponding path program 1 times [2022-11-02 21:07:36,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:36,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733776236] [2022-11-02 21:07:36,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:36,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:36,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:37,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-02 21:07:37,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:37,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:37,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:37,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-11-02 21:07:37,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:37,404 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:37,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:37,408 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-02 21:07:37,408 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:37,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733776236] [2022-11-02 21:07:37,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733776236] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:07:37,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259305505] [2022-11-02 21:07:37,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:37,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:07:37,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:07:37,410 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:07:37,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-02 21:07:37,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:37,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-02 21:07:37,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:07:37,586 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-02 21:07:37,616 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-02 21:07:37,617 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-02 21:07:37,657 INFO L356 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2022-11-02 21:07:37,658 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 78 [2022-11-02 21:07:37,666 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 10 treesize of output 9 [2022-11-02 21:07:37,675 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 16 treesize of output 15 [2022-11-02 21:07:37,737 INFO L356 Elim1Store]: treesize reduction 35, result has 2.8 percent of original size [2022-11-02 21:07:37,738 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 102 treesize of output 46 [2022-11-02 21:07:37,741 INFO L390 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 30 treesize of output 18 [2022-11-02 21:07:37,750 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse1 (+ |c_ULTIMATE.start_main_~#list~0#1.offset| 4))) (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#list~0#1.base|) .cse1))) (let ((.cse2 (not (= .cse0 |c_ULTIMATE.start_main_~x~0#1.base|)))) (or (and (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int))) (and (= (select (store (store (store (store |c_#memory_$Pointer$.base| .cse0 v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#list~0#1.base| v_DerPreprocessor_2) .cse0 v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#list~0#1.base| v_DerPreprocessor_2) .cse0) v_DerPreprocessor_1) (= .cse0 (select v_DerPreprocessor_2 .cse1)))) .cse2) (and .cse2 (not (= .cse0 |c_ULTIMATE.start_main_~#list~0#1.base|))))))) is different from true [2022-11-02 21:07:37,849 WARN L855 $PredicateComparison]: unable to prove that (or (exists ((|v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#list~0#1.offset_BEFORE_CALL_1| Int)) (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3|) (+ |v_ULTIMATE.start_main_~#list~0#1.offset_BEFORE_CALL_1| 4)) |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3|))) (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int)) (|v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#list~0#1.offset_BEFORE_CALL_1| Int)) (let ((.cse1 (+ |v_ULTIMATE.start_main_~#list~0#1.offset_BEFORE_CALL_1| 4))) (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3|) .cse1))) (and (= (select (store (store (store (store |c_#memory_$Pointer$.base| .cse0 v_DerPreprocessor_1) |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3| v_DerPreprocessor_2) .cse0 v_DerPreprocessor_1) |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_3| v_DerPreprocessor_2) .cse0) v_DerPreprocessor_1) (= (select v_DerPreprocessor_2 .cse1) .cse0)))))) is different from true [2022-11-02 21:07:48,409 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 3 not checked. [2022-11-02 21:07:48,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:07:48,641 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:07:48,641 INFO L390 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 124 treesize of output 127 [2022-11-02 21:07:48,646 INFO L390 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 136 treesize of output 128 [2022-11-02 21:07:48,652 INFO L390 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 128 treesize of output 124 [2022-11-02 21:07:48,715 INFO L390 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 8 treesize of output 4 [2022-11-02 21:07:48,724 INFO L390 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 22 treesize of output 18 [2022-11-02 21:07:48,906 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-02 21:07:48,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259305505] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:07:48,907 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:07:48,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 12] total 24 [2022-11-02 21:07:48,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038601789] [2022-11-02 21:07:48,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:07:48,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-02 21:07:48,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:07:48,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-02 21:07:48,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=383, Unknown=15, NotChecked=82, Total=552 [2022-11-02 21:07:48,912 INFO L87 Difference]: Start difference. First operand 60 states and 79 transitions. Second operand has 24 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 23 states have internal predecessors, (61), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-02 21:07:49,095 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse1 (+ |c_ULTIMATE.start_main_~#list~0#1.offset| 4))) (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#list~0#1.base|) .cse1))) (let ((.cse2 (not (= .cse0 |c_ULTIMATE.start_main_~x~0#1.base|)))) (and (not (= |c_ULTIMATE.start_main_~x~0#1.base| |c_ULTIMATE.start_main_~n~0#1.base|)) (or (and (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int))) (and (= (select (store (store (store (store |c_#memory_$Pointer$.base| .cse0 v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#list~0#1.base| v_DerPreprocessor_2) .cse0 v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#list~0#1.base| v_DerPreprocessor_2) .cse0) v_DerPreprocessor_1) (= .cse0 (select v_DerPreprocessor_2 .cse1)))) .cse2) (and .cse2 (not (= .cse0 |c_ULTIMATE.start_main_~#list~0#1.base|)))) .cse2 (= |c_ULTIMATE.start_main_~tail~0#1.base| |c_ULTIMATE.start_main_~#list~0#1.base|) (= |c_ULTIMATE.start_main_~tail~0#1.offset| |c_ULTIMATE.start_main_~#list~0#1.offset|) (= (select |c_#valid| |c_ULTIMATE.start_main_~n~0#1.base|) 1))))) is different from true [2022-11-02 21:07:49,110 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse1 (+ |c_ULTIMATE.start_main_~#list~0#1.offset| 4))) (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#list~0#1.base|) .cse1))) (let ((.cse2 (not (= .cse0 |c_ULTIMATE.start_main_~x~0#1.base|)))) (and (or (and (exists ((v_DerPreprocessor_1 (Array Int Int)) (v_DerPreprocessor_2 (Array Int Int))) (and (= (select (store (store (store (store |c_#memory_$Pointer$.base| .cse0 v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#list~0#1.base| v_DerPreprocessor_2) .cse0 v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#list~0#1.base| v_DerPreprocessor_2) .cse0) v_DerPreprocessor_1) (= .cse0 (select v_DerPreprocessor_2 .cse1)))) .cse2) (and .cse2 (not (= .cse0 |c_ULTIMATE.start_main_~#list~0#1.base|)))) .cse2)))) is different from true [2022-11-02 21:07:51,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:07:51,664 INFO L93 Difference]: Finished difference Result 169 states and 242 transitions. [2022-11-02 21:07:51,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-02 21:07:51,665 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 23 states have internal predecessors, (61), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) Word has length 46 [2022-11-02 21:07:51,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:07:51,667 INFO L225 Difference]: With dead ends: 169 [2022-11-02 21:07:51,667 INFO L226 Difference]: Without dead ends: 128 [2022-11-02 21:07:51,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=139, Invalid=718, Unknown=29, NotChecked=236, Total=1122 [2022-11-02 21:07:51,668 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 77 mSDsluCounter, 661 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 733 SdHoareTripleChecker+Invalid, 985 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 521 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-02 21:07:51,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 733 Invalid, 985 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 444 Invalid, 0 Unknown, 521 Unchecked, 0.5s Time] [2022-11-02 21:07:51,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-11-02 21:07:51,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 77. [2022-11-02 21:07:51,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 62 states have internal predecessors, (78), 10 states have call successors, (10), 5 states have call predecessors, (10), 8 states have return successors, (15), 9 states have call predecessors, (15), 9 states have call successors, (15) [2022-11-02 21:07:51,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 103 transitions. [2022-11-02 21:07:51,699 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 103 transitions. Word has length 46 [2022-11-02 21:07:51,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:07:51,701 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 103 transitions. [2022-11-02 21:07:51,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 2.9047619047619047) internal successors, (61), 23 states have internal predecessors, (61), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (9), 4 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-02 21:07:51,701 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 103 transitions. [2022-11-02 21:07:51,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-02 21:07:51,702 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:07:51,702 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 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] [2022-11-02 21:07:51,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-02 21:07:51,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-02 21:07:51,929 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:07:51,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:07:51,929 INFO L85 PathProgramCache]: Analyzing trace with hash 803799756, now seen corresponding path program 1 times [2022-11-02 21:07:51,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:07:51,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513362532] [2022-11-02 21:07:51,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:51,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:07:51,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:52,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:07:52,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:52,786 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:52,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:52,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:07:52,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:52,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:07:52,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:52,936 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-02 21:07:52,937 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:07:52,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513362532] [2022-11-02 21:07:52,937 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513362532] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:07:52,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252993850] [2022-11-02 21:07:52,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:07:52,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:07:52,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:07:52,939 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:07:52,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-02 21:07:53,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:07:53,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 92 conjunts are in the unsatisfiable core [2022-11-02 21:07:53,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:07:53,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:53,204 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:07:53,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:53,209 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:07:53,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:53,223 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:07:53,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:53,230 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:07:54,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:54,134 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-02 21:07:54,144 INFO L356 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-02 21:07:54,145 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 52 [2022-11-02 21:07:54,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:07:54,157 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 31 [2022-11-02 21:07:59,287 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-02 21:07:59,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:07:59,435 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:07:59,727 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:08:00,266 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:08:00,267 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 182 treesize of output 174 [2022-11-02 21:08:00,278 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:08:00,279 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 182 treesize of output 109 [2022-11-02 21:08:00,321 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:08:00,321 INFO L390 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 700 treesize of output 686 [2022-11-02 21:08:00,352 INFO L390 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 876 treesize of output 822 [2022-11-02 21:08:00,394 INFO L390 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 814 treesize of output 792 [2022-11-02 21:08:00,439 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:08:00,440 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 922 treesize of output 804 [2022-11-02 21:08:01,953 INFO L390 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 22 treesize of output 18 [2022-11-02 21:08:01,974 INFO L390 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 22 treesize of output 18 [2022-11-02 21:08:02,012 INFO L390 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 8 treesize of output 4 [2022-11-02 21:08:02,036 WARN L234 Elim1Store]: Array PQE input equivalent to true [2022-11-02 21:08:02,046 INFO L390 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 8 treesize of output 4 [2022-11-02 21:08:02,182 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:08:02,183 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 97 treesize of output 93 [2022-11-02 21:08:02,655 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-02 21:08:02,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252993850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:08:02,655 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:08:02,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 42 [2022-11-02 21:08:02,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137625645] [2022-11-02 21:08:02,656 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:08:02,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-02 21:08:02,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:08:02,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-02 21:08:02,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1559, Unknown=6, NotChecked=0, Total=1722 [2022-11-02 21:08:02,658 INFO L87 Difference]: Start difference. First operand 77 states and 103 transitions. Second operand has 42 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 41 states have internal predecessors, (77), 11 states have call successors, (11), 4 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-02 21:08:09,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:08:09,591 INFO L93 Difference]: Finished difference Result 193 states and 267 transitions. [2022-11-02 21:08:09,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-02 21:08:09,592 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 41 states have internal predecessors, (77), 11 states have call successors, (11), 4 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) Word has length 43 [2022-11-02 21:08:09,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:08:09,594 INFO L225 Difference]: With dead ends: 193 [2022-11-02 21:08:09,594 INFO L226 Difference]: Without dead ends: 143 [2022-11-02 21:08:09,595 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=358, Invalid=3050, Unknown=14, NotChecked=0, Total=3422 [2022-11-02 21:08:09,596 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 174 mSDsluCounter, 839 mSDsCounter, 0 mSdLazyCounter, 849 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 889 SdHoareTripleChecker+Invalid, 1144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 849 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 175 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-02 21:08:09,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 889 Invalid, 1144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 849 Invalid, 0 Unknown, 175 Unchecked, 1.2s Time] [2022-11-02 21:08:09,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-02 21:08:09,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 109. [2022-11-02 21:08:09,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 88 states have internal predecessors, (103), 15 states have call successors, (15), 7 states have call predecessors, (15), 14 states have return successors, (29), 13 states have call predecessors, (29), 14 states have call successors, (29) [2022-11-02 21:08:09,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 147 transitions. [2022-11-02 21:08:09,617 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 147 transitions. Word has length 43 [2022-11-02 21:08:09,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:08:09,618 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 147 transitions. [2022-11-02 21:08:09,618 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 39 states have (on average 1.9743589743589745) internal successors, (77), 41 states have internal predecessors, (77), 11 states have call successors, (11), 4 states have call predecessors, (11), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-02 21:08:09,618 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 147 transitions. [2022-11-02 21:08:09,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-02 21:08:09,619 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:08:09,619 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 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] [2022-11-02 21:08:09,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-02 21:08:09,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-02 21:08:09,845 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:08:09,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:08:09,845 INFO L85 PathProgramCache]: Analyzing trace with hash -13848694, now seen corresponding path program 1 times [2022-11-02 21:08:09,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:08:09,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88592826] [2022-11-02 21:08:09,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:08:09,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:08:09,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:10,120 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:08:10,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:10,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:10,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:10,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:08:10,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:10,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:10,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:10,141 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-02 21:08:10,141 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:08:10,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88592826] [2022-11-02 21:08:10,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88592826] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:08:10,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300927969] [2022-11-02 21:08:10,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:08:10,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:08:10,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:08:10,145 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:08:10,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-02 21:08:10,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:10,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 43 conjunts are in the unsatisfiable core [2022-11-02 21:08:10,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:08:10,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:08:10,390 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:08:10,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:08:10,396 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-02 21:08:10,648 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 24 treesize of output 12 [2022-11-02 21:08:10,673 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-02 21:08:10,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:08:10,751 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:08:10,896 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:08:10,897 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 29 [2022-11-02 21:08:10,900 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 30 treesize of output 22 [2022-11-02 21:08:10,908 INFO L390 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 5 treesize of output 3 [2022-11-02 21:08:10,994 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-02 21:08:10,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300927969] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:08:10,995 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:08:10,995 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 23 [2022-11-02 21:08:10,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966055329] [2022-11-02 21:08:10,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:08:10,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-02 21:08:10,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:08:11,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-02 21:08:11,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-11-02 21:08:11,001 INFO L87 Difference]: Start difference. First operand 109 states and 147 transitions. Second operand has 23 states, 23 states have (on average 2.608695652173913) internal successors, (60), 23 states have internal predecessors, (60), 6 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-02 21:08:12,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:08:12,106 INFO L93 Difference]: Finished difference Result 240 states and 327 transitions. [2022-11-02 21:08:12,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-02 21:08:12,107 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.608695652173913) internal successors, (60), 23 states have internal predecessors, (60), 6 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 43 [2022-11-02 21:08:12,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:08:12,108 INFO L225 Difference]: With dead ends: 240 [2022-11-02 21:08:12,109 INFO L226 Difference]: Without dead ends: 194 [2022-11-02 21:08:12,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=285, Invalid=1047, Unknown=0, NotChecked=0, Total=1332 [2022-11-02 21:08:12,110 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 161 mSDsluCounter, 701 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-02 21:08:12,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [164 Valid, 790 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 410 Invalid, 0 Unknown, 51 Unchecked, 0.4s Time] [2022-11-02 21:08:12,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2022-11-02 21:08:12,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 167. [2022-11-02 21:08:12,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 124 states have (on average 1.282258064516129) internal successors, (159), 132 states have internal predecessors, (159), 24 states have call successors, (24), 14 states have call predecessors, (24), 18 states have return successors, (42), 20 states have call predecessors, (42), 22 states have call successors, (42) [2022-11-02 21:08:12,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 225 transitions. [2022-11-02 21:08:12,148 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 225 transitions. Word has length 43 [2022-11-02 21:08:12,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:08:12,148 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 225 transitions. [2022-11-02 21:08:12,148 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.608695652173913) internal successors, (60), 23 states have internal predecessors, (60), 6 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2022-11-02 21:08:12,149 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 225 transitions. [2022-11-02 21:08:12,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-02 21:08:12,150 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:08:12,150 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:08:12,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-02 21:08:12,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:08:12,366 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:08:12,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:08:12,367 INFO L85 PathProgramCache]: Analyzing trace with hash 828672736, now seen corresponding path program 1 times [2022-11-02 21:08:12,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:08:12,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976593868] [2022-11-02 21:08:12,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:08:12,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:08:12,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:12,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:08:12,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:12,569 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:12,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:12,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:08:12,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:12,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:12,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:12,610 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-02 21:08:12,610 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:08:12,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976593868] [2022-11-02 21:08:12,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976593868] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:08:12,611 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:08:12,611 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-02 21:08:12,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720753749] [2022-11-02 21:08:12,611 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:08:12,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-02 21:08:12,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:08:12,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-02 21:08:12,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-02 21:08:12,614 INFO L87 Difference]: Start difference. First operand 167 states and 225 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-02 21:08:12,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:08:12,725 INFO L93 Difference]: Finished difference Result 203 states and 275 transitions. [2022-11-02 21:08:12,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-02 21:08:12,726 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 44 [2022-11-02 21:08:12,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:08:12,727 INFO L225 Difference]: With dead ends: 203 [2022-11-02 21:08:12,727 INFO L226 Difference]: Without dead ends: 201 [2022-11-02 21:08:12,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-02 21:08:12,730 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 7 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-02 21:08:12,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 324 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-02 21:08:12,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-11-02 21:08:12,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 182. [2022-11-02 21:08:12,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 134 states have (on average 1.2611940298507462) internal successors, (169), 142 states have internal predecessors, (169), 26 states have call successors, (26), 16 states have call predecessors, (26), 21 states have return successors, (53), 23 states have call predecessors, (53), 24 states have call successors, (53) [2022-11-02 21:08:12,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 248 transitions. [2022-11-02 21:08:12,774 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 248 transitions. Word has length 44 [2022-11-02 21:08:12,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:08:12,774 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 248 transitions. [2022-11-02 21:08:12,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2022-11-02 21:08:12,775 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 248 transitions. [2022-11-02 21:08:12,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-02 21:08:12,777 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:08:12,777 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:08:12,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-02 21:08:12,777 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:08:12,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:08:12,778 INFO L85 PathProgramCache]: Analyzing trace with hash 1865771786, now seen corresponding path program 1 times [2022-11-02 21:08:12,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:08:12,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824844106] [2022-11-02 21:08:12,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:08:12,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:08:12,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:12,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:08:12,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:13,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:13,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:13,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:08:13,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:13,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2022-11-02 21:08:13,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:13,021 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-02 21:08:13,022 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:08:13,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824844106] [2022-11-02 21:08:13,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824844106] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:08:13,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898187787] [2022-11-02 21:08:13,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:08:13,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:08:13,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:08:13,024 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:08:13,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-02 21:08:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:13,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-02 21:08:13,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:08:13,280 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-02 21:08:13,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:08:13,348 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-02 21:08:13,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898187787] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:08:13,348 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:08:13,349 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-02 21:08:13,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084515] [2022-11-02 21:08:13,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:08:13,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-02 21:08:13,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:08:13,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-02 21:08:13,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-11-02 21:08:13,351 INFO L87 Difference]: Start difference. First operand 182 states and 248 transitions. Second operand has 12 states, 12 states have (on average 5.583333333333333) internal successors, (67), 12 states have internal predecessors, (67), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-02 21:08:13,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:08:13,626 INFO L93 Difference]: Finished difference Result 243 states and 321 transitions. [2022-11-02 21:08:13,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-02 21:08:13,627 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.583333333333333) internal successors, (67), 12 states have internal predecessors, (67), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 46 [2022-11-02 21:08:13,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:08:13,628 INFO L225 Difference]: With dead ends: 243 [2022-11-02 21:08:13,628 INFO L226 Difference]: Without dead ends: 177 [2022-11-02 21:08:13,629 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2022-11-02 21:08:13,630 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 69 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-02 21:08:13,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 199 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-02 21:08:13,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2022-11-02 21:08:13,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 132. [2022-11-02 21:08:13,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 99 states have (on average 1.2525252525252526) internal successors, (124), 104 states have internal predecessors, (124), 15 states have call successors, (15), 12 states have call predecessors, (15), 17 states have return successors, (34), 15 states have call predecessors, (34), 14 states have call successors, (34) [2022-11-02 21:08:13,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 173 transitions. [2022-11-02 21:08:13,654 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 173 transitions. Word has length 46 [2022-11-02 21:08:13,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:08:13,654 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 173 transitions. [2022-11-02 21:08:13,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 5.583333333333333) internal successors, (67), 12 states have internal predecessors, (67), 5 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-02 21:08:13,655 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 173 transitions. [2022-11-02 21:08:13,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-02 21:08:13,656 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:08:13,656 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1] [2022-11-02 21:08:13,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-02 21:08:13,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:08:13,877 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:08:13,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:08:13,877 INFO L85 PathProgramCache]: Analyzing trace with hash 604583819, now seen corresponding path program 2 times [2022-11-02 21:08:13,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:08:13,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324089073] [2022-11-02 21:08:13,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:08:13,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:08:13,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:14,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:08:14,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:14,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:14,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:14,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:08:14,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:14,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:14,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:14,820 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:08:14,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:08:14,822 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2022-11-02 21:08:14,822 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:08:14,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324089073] [2022-11-02 21:08:14,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324089073] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:08:14,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994769675] [2022-11-02 21:08:14,823 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-11-02 21:08:14,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:08:14,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:08:14,825 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:08:14,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-02 21:08:15,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-11-02 21:08:15,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-02 21:08:15,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-02 21:08:15,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:08:15,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:08:15,058 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:08:15,072 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-02 21:08:15,072 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-11-02 21:08:15,081 INFO L390 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 5 treesize of output 3 [2022-11-02 21:08:15,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:08:15,087 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:08:15,102 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-02 21:08:15,103 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 20 [2022-11-02 21:08:15,109 INFO L390 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 5 treesize of output 3 [2022-11-02 21:08:15,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:08:15,509 INFO L356 Elim1Store]: treesize reduction 56, result has 35.6 percent of original size [2022-11-02 21:08:15,510 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 80 [2022-11-02 21:08:15,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:08:15,550 INFO L356 Elim1Store]: treesize reduction 46, result has 35.2 percent of original size [2022-11-02 21:08:15,550 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 84 treesize of output 79 [2022-11-02 21:08:35,922 WARN L234 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 43 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:08:47,865 WARN L234 SmtUtils]: Spent 6.04s on a formula simplification that was a NOOP. DAG size: 46 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:08:54,038 WARN L234 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 43 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:09:00,285 WARN L234 SmtUtils]: Spent 6.04s on a formula simplification that was a NOOP. DAG size: 48 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:09:00,604 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 36 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-02 21:09:00,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:09:00,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994769675] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:00,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-02 21:09:00,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 22] total 33 [2022-11-02 21:09:00,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733590056] [2022-11-02 21:09:00,806 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-02 21:09:00,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-02 21:09:00,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:09:00,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-02 21:09:00,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=996, Unknown=8, NotChecked=0, Total=1122 [2022-11-02 21:09:00,808 INFO L87 Difference]: Start difference. First operand 132 states and 173 transitions. Second operand has 33 states, 29 states have (on average 1.8620689655172413) internal successors, (54), 31 states have internal predecessors, (54), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-02 21:09:14,584 WARN L234 SmtUtils]: Spent 6.03s on a formula simplification that was a NOOP. DAG size: 49 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:09:27,861 WARN L234 SmtUtils]: Spent 8.36s on a formula simplification. DAG size of input: 65 DAG size of output: 59 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:09:28,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:09:28,113 INFO L93 Difference]: Finished difference Result 207 states and 268 transitions. [2022-11-02 21:09:28,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-02 21:09:28,114 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 29 states have (on average 1.8620689655172413) internal successors, (54), 31 states have internal predecessors, (54), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) Word has length 50 [2022-11-02 21:09:28,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:09:28,115 INFO L225 Difference]: With dead ends: 207 [2022-11-02 21:09:28,115 INFO L226 Difference]: Without dead ends: 148 [2022-11-02 21:09:28,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 71.5s TimeCoverageRelationStatistics Valid=284, Invalid=2055, Unknown=13, NotChecked=0, Total=2352 [2022-11-02 21:09:28,117 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 52 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 673 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 317 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-02 21:09:28,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 587 Invalid, 673 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 328 Invalid, 0 Unknown, 317 Unchecked, 0.5s Time] [2022-11-02 21:09:28,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-11-02 21:09:28,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 142. [2022-11-02 21:09:28,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 108 states have (on average 1.2407407407407407) internal successors, (134), 113 states have internal predecessors, (134), 16 states have call successors, (16), 13 states have call predecessors, (16), 17 states have return successors, (35), 15 states have call predecessors, (35), 15 states have call successors, (35) [2022-11-02 21:09:28,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 185 transitions. [2022-11-02 21:09:28,140 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 185 transitions. Word has length 50 [2022-11-02 21:09:28,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:09:28,140 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 185 transitions. [2022-11-02 21:09:28,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 29 states have (on average 1.8620689655172413) internal successors, (54), 31 states have internal predecessors, (54), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-11-02 21:09:28,141 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 185 transitions. [2022-11-02 21:09:28,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-02 21:09:28,142 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:09:28,142 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 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] [2022-11-02 21:09:28,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-02 21:09:28,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-02 21:09:28,357 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:09:28,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:09:28,357 INFO L85 PathProgramCache]: Analyzing trace with hash -2065761268, now seen corresponding path program 1 times [2022-11-02 21:09:28,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:09:28,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076397728] [2022-11-02 21:09:28,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:28,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:09:28,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:28,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-11-02 21:09:28,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:28,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:28,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:28,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2022-11-02 21:09:28,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:28,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:28,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:28,987 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-02 21:09:28,987 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:09:28,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076397728] [2022-11-02 21:09:28,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076397728] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:28,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488008322] [2022-11-02 21:09:28,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:28,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:28,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:09:28,989 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:09:29,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-02 21:09:29,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:29,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-02 21:09:29,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:09:29,253 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-02 21:09:29,352 INFO L356 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-02 21:09:29,353 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2022-11-02 21:09:29,402 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-02 21:09:29,402 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-02 21:09:29,462 INFO L356 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2022-11-02 21:09:29,463 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 78 [2022-11-02 21:09:29,470 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 10 treesize of output 9 [2022-11-02 21:09:29,478 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 16 treesize of output 15 [2022-11-02 21:09:29,521 INFO L356 Elim1Store]: treesize reduction 35, result has 2.8 percent of original size [2022-11-02 21:09:29,521 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 102 treesize of output 46 [2022-11-02 21:09:29,525 INFO L390 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 30 treesize of output 18 [2022-11-02 21:09:29,633 WARN L855 $PredicateComparison]: unable to prove that (exists ((v_DerPreprocessor_3 (Array Int Int)) (|v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_13| Int) (v_DerPreprocessor_4 (Array Int Int))) (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_13|) 4))) (and (= (select v_DerPreprocessor_4 4) .cse0) (= (select (store (store (store (store |c_#memory_$Pointer$.base| .cse0 v_DerPreprocessor_3) |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_13| v_DerPreprocessor_4) .cse0 v_DerPreprocessor_3) |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_13| v_DerPreprocessor_4) .cse0) v_DerPreprocessor_3)))) is different from true [2022-11-02 21:09:29,932 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 11 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-02 21:09:29,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:09:30,000 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:09:30,168 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:09:30,469 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:09:30,518 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:09:30,518 INFO L390 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 124 treesize of output 127 [2022-11-02 21:09:30,524 INFO L390 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 136 treesize of output 128 [2022-11-02 21:09:30,530 INFO L390 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 128 treesize of output 124 [2022-11-02 21:09:30,598 INFO L390 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 8 treesize of output 4 [2022-11-02 21:09:30,610 INFO L390 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 22 treesize of output 18 [2022-11-02 21:09:30,990 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-02 21:09:30,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488008322] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:09:30,990 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:09:30,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 13] total 32 [2022-11-02 21:09:30,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559659028] [2022-11-02 21:09:30,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:09:30,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-02 21:09:30,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:09:30,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-02 21:09:30,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=839, Unknown=2, NotChecked=58, Total=992 [2022-11-02 21:09:30,992 INFO L87 Difference]: Start difference. First operand 142 states and 185 transitions. Second operand has 32 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-02 21:09:32,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:09:32,187 INFO L93 Difference]: Finished difference Result 282 states and 374 transitions. [2022-11-02 21:09:32,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-02 21:09:32,188 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) Word has length 49 [2022-11-02 21:09:32,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:09:32,190 INFO L225 Difference]: With dead ends: 282 [2022-11-02 21:09:32,190 INFO L226 Difference]: Without dead ends: 201 [2022-11-02 21:09:32,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=284, Invalid=2065, Unknown=7, NotChecked=94, Total=2450 [2022-11-02 21:09:32,192 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 144 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 315 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-02 21:09:32,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 569 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 429 Invalid, 0 Unknown, 315 Unchecked, 0.4s Time] [2022-11-02 21:09:32,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2022-11-02 21:09:32,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 152. [2022-11-02 21:09:32,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 117 states have (on average 1.264957264957265) internal successors, (148), 122 states have internal predecessors, (148), 16 states have call successors, (16), 13 states have call predecessors, (16), 18 states have return successors, (36), 16 states have call predecessors, (36), 15 states have call successors, (36) [2022-11-02 21:09:32,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 200 transitions. [2022-11-02 21:09:32,223 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 200 transitions. Word has length 49 [2022-11-02 21:09:32,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:09:32,223 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 200 transitions. [2022-11-02 21:09:32,224 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 2.6333333333333333) internal successors, (79), 31 states have internal predecessors, (79), 7 states have call successors, (10), 3 states have call predecessors, (10), 6 states have return successors, (9), 5 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-02 21:09:32,224 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 200 transitions. [2022-11-02 21:09:32,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-02 21:09:32,225 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:09:32,225 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1, 1, 1] [2022-11-02 21:09:32,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-02 21:09:32,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-02 21:09:32,429 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:09:32,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:09:32,429 INFO L85 PathProgramCache]: Analyzing trace with hash 1255123037, now seen corresponding path program 1 times [2022-11-02 21:09:32,429 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:09:32,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887585994] [2022-11-02 21:09:32,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:32,430 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:09:32,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2022-11-02 21:09:32,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,615 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:32,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2022-11-02 21:09:32,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:32,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:32,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,636 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2022-11-02 21:09:32,636 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:09:32,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887585994] [2022-11-02 21:09:32,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887585994] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:32,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792955972] [2022-11-02 21:09:32,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:32,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:32,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:09:32,638 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:09:32,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-02 21:09:32,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:32,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 61 conjunts are in the unsatisfiable core [2022-11-02 21:09:32,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:09:32,882 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-02 21:09:32,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:32,907 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:32,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:32,912 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-02 21:09:32,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:32,921 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:32,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:32,928 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-02 21:09:33,003 INFO L356 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-02 21:09:33,003 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-02 21:09:33,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:33,063 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-02 21:09:33,063 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 27 [2022-11-02 21:09:33,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:33,085 INFO L356 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-02 21:09:33,086 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 27 [2022-11-02 21:09:33,271 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-11-02 21:09:33,274 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 7 [2022-11-02 21:09:33,298 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 32 proven. 5 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-02 21:09:33,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:09:33,386 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 4 [2022-11-02 21:09:33,547 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_ULTIMATE.start_main_~x~0#1.offset| 4))) (and (forall ((v_ArrVal_1314 (Array Int Int)) (v_ArrVal_1312 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~n~0#1.base| v_ArrVal_1314) |c_ULTIMATE.start_main_~tail~0#1.base| v_ArrVal_1312) |c_ULTIMATE.start_main_~x~0#1.base|) .cse0) 0)) (forall ((v_ArrVal_1313 (Array Int Int)) (v_ArrVal_1311 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~n~0#1.base| v_ArrVal_1311) |c_ULTIMATE.start_main_~tail~0#1.base| v_ArrVal_1313) |c_ULTIMATE.start_main_~x~0#1.base|) .cse0) 0)))) is different from false [2022-11-02 21:09:33,697 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:09:33,697 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 37 [2022-11-02 21:09:33,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 276 treesize of output 258 [2022-11-02 21:09:33,714 INFO L390 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 130 treesize of output 122 [2022-11-02 21:09:33,719 INFO L390 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 230 treesize of output 198 [2022-11-02 21:09:33,724 INFO L390 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 198 treesize of output 182 [2022-11-02 21:09:33,763 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:09:33,763 INFO L390 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 31 treesize of output 37 [2022-11-02 21:09:33,767 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-02 21:09:33,769 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 140 treesize of output 122 [2022-11-02 21:09:33,783 INFO L390 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 24 treesize of output 16 [2022-11-02 21:09:33,824 INFO L390 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 [2022-11-02 21:09:33,861 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 52 trivial. 1 not checked. [2022-11-02 21:09:33,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792955972] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:09:33,862 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:09:33,862 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 9] total 21 [2022-11-02 21:09:33,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810655713] [2022-11-02 21:09:33,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:09:33,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-02 21:09:33,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:09:33,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-02 21:09:33,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=326, Unknown=3, NotChecked=36, Total=420 [2022-11-02 21:09:33,866 INFO L87 Difference]: Start difference. First operand 152 states and 200 transitions. Second operand has 21 states, 21 states have (on average 3.0952380952380953) internal successors, (65), 19 states have internal predecessors, (65), 5 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-02 21:09:34,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:09:34,485 INFO L93 Difference]: Finished difference Result 245 states and 319 transitions. [2022-11-02 21:09:34,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-02 21:09:34,487 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0952380952380953) internal successors, (65), 19 states have internal predecessors, (65), 5 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) Word has length 54 [2022-11-02 21:09:34,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:09:34,488 INFO L225 Difference]: With dead ends: 245 [2022-11-02 21:09:34,488 INFO L226 Difference]: Without dead ends: 145 [2022-11-02 21:09:34,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=170, Invalid=823, Unknown=3, NotChecked=60, Total=1056 [2022-11-02 21:09:34,489 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 53 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 587 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 162 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-02 21:09:34,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 587 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 218 Invalid, 0 Unknown, 162 Unchecked, 0.2s Time] [2022-11-02 21:09:34,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2022-11-02 21:09:34,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 124. [2022-11-02 21:09:34,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 95 states have (on average 1.2421052631578948) internal successors, (118), 99 states have internal predecessors, (118), 14 states have call successors, (14), 11 states have call predecessors, (14), 14 states have return successors, (22), 13 states have call predecessors, (22), 13 states have call successors, (22) [2022-11-02 21:09:34,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 154 transitions. [2022-11-02 21:09:34,523 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 154 transitions. Word has length 54 [2022-11-02 21:09:34,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:09:34,523 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 154 transitions. [2022-11-02 21:09:34,525 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.0952380952380953) internal successors, (65), 19 states have internal predecessors, (65), 5 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (9), 7 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-02 21:09:34,526 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 154 transitions. [2022-11-02 21:09:34,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-02 21:09:34,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:09:34,527 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:09:34,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-02 21:09:34,740 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-02 21:09:34,741 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:09:34,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:09:34,741 INFO L85 PathProgramCache]: Analyzing trace with hash -664222695, now seen corresponding path program 1 times [2022-11-02 21:09:34,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:09:34,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548489878] [2022-11-02 21:09:34,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:34,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:09:34,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:09:35,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:35,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:09:35,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-02 21:09:35,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-02 21:09:35,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,709 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-02 21:09:35,710 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:09:35,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548489878] [2022-11-02 21:09:35,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548489878] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:35,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185352982] [2022-11-02 21:09:35,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:35,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:35,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:09:35,712 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:09:35,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-02 21:09:35,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:35,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-02 21:09:35,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:09:36,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:36,021 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:36,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:36,030 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:36,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:36,038 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:09:36,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:36,045 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 18 [2022-11-02 21:09:36,548 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-02 21:09:36,549 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2022-11-02 21:09:36,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:36,555 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-02 21:09:36,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:36,941 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 12 [2022-11-02 21:09:36,960 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 7 [2022-11-02 21:09:37,001 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-02 21:09:37,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:09:37,123 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_remove_~x#1.base|) |c_ULTIMATE.start_remove_~x#1.offset|)) (.cse1 (+ |c_ULTIMATE.start_main_~x~0#1.offset| 4))) (and (forall ((v_ArrVal_1433 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1433) |c_ULTIMATE.start_main_~x~0#1.base|) .cse1) 0)) (forall ((v_ArrVal_1432 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1432) |c_ULTIMATE.start_main_~x~0#1.base|) .cse1) 0)))) is different from false [2022-11-02 21:09:37,156 WARN L833 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~x~0#1.base|) |c_ULTIMATE.start_main_~x~0#1.offset|)) (.cse1 (+ |c_ULTIMATE.start_main_~x~0#1.offset| 4))) (and (forall ((v_ArrVal_1432 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1432) |c_ULTIMATE.start_main_~x~0#1.base|) .cse1) 0)) (forall ((v_ArrVal_1433 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1433) |c_ULTIMATE.start_main_~x~0#1.base|) .cse1) 0)))) is different from false [2022-11-02 21:09:37,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1185352982] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:37,181 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-02 21:09:37,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9] total 20 [2022-11-02 21:09:37,182 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068106760] [2022-11-02 21:09:37,182 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-02 21:09:37,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-02 21:09:37,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:09:37,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-02 21:09:37,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=402, Unknown=2, NotChecked=82, Total=552 [2022-11-02 21:09:37,183 INFO L87 Difference]: Start difference. First operand 124 states and 154 transitions. Second operand has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 6 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-02 21:09:39,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:09:39,530 INFO L93 Difference]: Finished difference Result 193 states and 240 transitions. [2022-11-02 21:09:39,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-02 21:09:39,531 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 6 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) Word has length 53 [2022-11-02 21:09:39,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:09:39,532 INFO L225 Difference]: With dead ends: 193 [2022-11-02 21:09:39,533 INFO L226 Difference]: Without dead ends: 168 [2022-11-02 21:09:39,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=329, Invalid=1317, Unknown=2, NotChecked=158, Total=1806 [2022-11-02 21:09:39,535 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 182 mSDsluCounter, 420 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 700 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 55 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-02 21:09:39,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 474 Invalid, 700 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 514 Invalid, 0 Unknown, 55 Unchecked, 0.7s Time] [2022-11-02 21:09:39,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-11-02 21:09:39,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 124. [2022-11-02 21:09:39,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 95 states have (on average 1.231578947368421) internal successors, (117), 99 states have internal predecessors, (117), 14 states have call successors, (14), 11 states have call predecessors, (14), 14 states have return successors, (22), 13 states have call predecessors, (22), 13 states have call successors, (22) [2022-11-02 21:09:39,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 153 transitions. [2022-11-02 21:09:39,571 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 153 transitions. Word has length 53 [2022-11-02 21:09:39,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:09:39,571 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 153 transitions. [2022-11-02 21:09:39,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.3) internal successors, (66), 20 states have internal predecessors, (66), 6 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2022-11-02 21:09:39,572 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 153 transitions. [2022-11-02 21:09:39,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-02 21:09:39,573 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:09:39,573 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:09:39,615 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-02 21:09:39,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-02 21:09:39,778 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:09:39,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:09:39,778 INFO L85 PathProgramCache]: Analyzing trace with hash -1675339945, now seen corresponding path program 1 times [2022-11-02 21:09:39,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:09:39,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366861175] [2022-11-02 21:09:39,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:39,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:09:39,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:40,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:09:40,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:40,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:40,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:40,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:09:40,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:40,710 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-02 21:09:40,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:40,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-02 21:09:40,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:40,794 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-02 21:09:40,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:09:40,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366861175] [2022-11-02 21:09:40,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366861175] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:40,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552123593] [2022-11-02 21:09:40,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:40,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:40,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:09:40,797 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:09:40,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-02 21:09:41,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:41,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 95 conjunts are in the unsatisfiable core [2022-11-02 21:09:41,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:09:41,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:41,188 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:41,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:41,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:09:41,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:41,209 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:41,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:41,217 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:09:42,023 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-02 21:09:42,024 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 51 [2022-11-02 21:09:42,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:42,037 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 42 [2022-11-02 21:09:43,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:43,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:43,019 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-02 21:09:43,028 INFO L356 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-02 21:09:43,028 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 43 [2022-11-02 21:09:43,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:43,034 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 16 [2022-11-02 21:09:43,411 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-02 21:09:43,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:09:53,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552123593] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:53,076 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-02 21:09:53,076 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19] total 31 [2022-11-02 21:09:53,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046688784] [2022-11-02 21:09:53,077 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-02 21:09:53,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-02 21:09:53,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:09:53,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-02 21:09:53,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1469, Unknown=5, NotChecked=0, Total=1640 [2022-11-02 21:09:53,079 INFO L87 Difference]: Start difference. First operand 124 states and 153 transitions. Second operand has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 9 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-02 21:09:54,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:09:54,540 INFO L93 Difference]: Finished difference Result 159 states and 199 transitions. [2022-11-02 21:09:54,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-02 21:09:54,541 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 9 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) Word has length 53 [2022-11-02 21:09:54,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:09:54,543 INFO L225 Difference]: With dead ends: 159 [2022-11-02 21:09:54,543 INFO L226 Difference]: Without dead ends: 150 [2022-11-02 21:09:54,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 74 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=374, Invalid=2701, Unknown=5, NotChecked=0, Total=3080 [2022-11-02 21:09:54,545 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 89 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 530 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 204 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-02 21:09:54,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 530 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 383 Invalid, 0 Unknown, 204 Unchecked, 0.5s Time] [2022-11-02 21:09:54,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-11-02 21:09:54,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 143. [2022-11-02 21:09:54,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 109 states have (on average 1.2110091743119267) internal successors, (132), 114 states have internal predecessors, (132), 17 states have call successors, (17), 13 states have call predecessors, (17), 16 states have return successors, (30), 15 states have call predecessors, (30), 16 states have call successors, (30) [2022-11-02 21:09:54,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 179 transitions. [2022-11-02 21:09:54,583 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 179 transitions. Word has length 53 [2022-11-02 21:09:54,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:09:54,583 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 179 transitions. [2022-11-02 21:09:54,583 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 9 states have call successors, (11), 5 states have call predecessors, (11), 6 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2022-11-02 21:09:54,584 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 179 transitions. [2022-11-02 21:09:54,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-02 21:09:54,585 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:09:54,585 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:09:54,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-02 21:09:54,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:54,793 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:09:54,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:09:54,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1417174507, now seen corresponding path program 1 times [2022-11-02 21:09:54,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:09:54,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808651404] [2022-11-02 21:09:54,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:54,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:09:54,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:09:55,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,316 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:55,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,319 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:09:55,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-02 21:09:55,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-02 21:09:55,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,330 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-02 21:09:55,330 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:09:55,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808651404] [2022-11-02 21:09:55,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808651404] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:55,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576873761] [2022-11-02 21:09:55,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:55,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:55,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:09:55,333 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:09:55,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-02 21:09:55,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:55,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-02 21:09:55,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:09:55,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:55,632 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:55,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:55,637 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:09:55,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:55,652 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:09:55,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:55,658 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:09:56,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:56,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 10 [2022-11-02 21:09:56,241 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-02 21:09:56,241 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 36 [2022-11-02 21:09:56,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:09:56,659 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:09:56,660 INFO L390 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 1 case distinctions, treesize of input 34 treesize of output 16 [2022-11-02 21:09:56,701 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-02 21:09:56,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:09:57,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576873761] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:57,026 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-02 21:09:57,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2022-11-02 21:09:57,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33940079] [2022-11-02 21:09:57,026 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-02 21:09:57,027 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-02 21:09:57,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:09:57,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-02 21:09:57,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2022-11-02 21:09:57,028 INFO L87 Difference]: Start difference. First operand 143 states and 179 transitions. Second operand has 26 states, 26 states have (on average 2.730769230769231) internal successors, (71), 26 states have internal predecessors, (71), 7 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-02 21:09:58,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:09:58,704 INFO L93 Difference]: Finished difference Result 168 states and 205 transitions. [2022-11-02 21:09:58,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-02 21:09:58,704 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.730769230769231) internal successors, (71), 26 states have internal predecessors, (71), 7 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 53 [2022-11-02 21:09:58,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:09:58,705 INFO L225 Difference]: With dead ends: 168 [2022-11-02 21:09:58,706 INFO L226 Difference]: Without dead ends: 143 [2022-11-02 21:09:58,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 82 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=317, Invalid=2335, Unknown=0, NotChecked=0, Total=2652 [2022-11-02 21:09:58,707 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 92 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 80 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-02 21:09:58,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 442 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 402 Invalid, 0 Unknown, 80 Unchecked, 0.4s Time] [2022-11-02 21:09:58,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-02 21:09:58,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2022-11-02 21:09:58,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 108 states have (on average 1.1944444444444444) internal successors, (129), 112 states have internal predecessors, (129), 16 states have call successors, (16), 13 states have call predecessors, (16), 16 states have return successors, (27), 15 states have call predecessors, (27), 15 states have call successors, (27) [2022-11-02 21:09:58,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 172 transitions. [2022-11-02 21:09:58,752 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 172 transitions. Word has length 53 [2022-11-02 21:09:58,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:09:58,753 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 172 transitions. [2022-11-02 21:09:58,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.730769230769231) internal successors, (71), 26 states have internal predecessors, (71), 7 states have call successors, (11), 4 states have call predecessors, (11), 5 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-02 21:09:58,753 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 172 transitions. [2022-11-02 21:09:58,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-02 21:09:58,754 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:09:58,754 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 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, 1] [2022-11-02 21:09:58,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-02 21:09:58,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:58,969 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:09:58,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:09:58,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1149281501, now seen corresponding path program 1 times [2022-11-02 21:09:58,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:09:58,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142794966] [2022-11-02 21:09:58,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:58,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:09:59,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2022-11-02 21:09:59,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,539 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:59,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:59,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2022-11-02 21:09:59,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:09:59,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,551 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-11-02 21:09:59,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:09:59,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142794966] [2022-11-02 21:09:59,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142794966] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:09:59,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443445162] [2022-11-02 21:09:59,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:09:59,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:09:59,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:09:59,561 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:09:59,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-02 21:09:59,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:09:59,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 115 conjunts are in the unsatisfiable core [2022-11-02 21:09:59,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:09:59,959 INFO L356 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2022-11-02 21:09:59,959 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 78 [2022-11-02 21:09:59,970 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2022-11-02 21:09:59,976 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 9 [2022-11-02 21:10:00,027 INFO L390 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 7 treesize of output 3 [2022-11-02 21:10:00,049 INFO L356 Elim1Store]: treesize reduction 13, result has 38.1 percent of original size [2022-11-02 21:10:00,049 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 40 treesize of output 21 [2022-11-02 21:10:00,057 INFO L390 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 7 treesize of output 3 [2022-11-02 21:10:01,168 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 27 proven. 36 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-02 21:10:01,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:10:01,907 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 60 treesize of output 42 [2022-11-02 21:10:02,541 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-02 21:10:02,541 INFO L390 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 70 treesize of output 57 [2022-11-02 21:10:02,712 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 2 proven. 37 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-02 21:10:02,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443445162] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-02 21:10:02,713 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-02 21:10:02,713 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 22, 18] total 48 [2022-11-02 21:10:02,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648547410] [2022-11-02 21:10:02,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-02 21:10:02,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-02 21:10:02,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:10:02,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-02 21:10:02,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2073, Unknown=0, NotChecked=0, Total=2256 [2022-11-02 21:10:02,715 INFO L87 Difference]: Start difference. First operand 141 states and 172 transitions. Second operand has 48 states, 42 states have (on average 2.5952380952380953) internal successors, (109), 46 states have internal predecessors, (109), 12 states have call successors, (14), 4 states have call predecessors, (14), 11 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2022-11-02 21:10:05,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:10:05,281 INFO L93 Difference]: Finished difference Result 220 states and 266 transitions. [2022-11-02 21:10:05,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-02 21:10:05,282 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 42 states have (on average 2.5952380952380953) internal successors, (109), 46 states have internal predecessors, (109), 12 states have call successors, (14), 4 states have call predecessors, (14), 11 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) Word has length 59 [2022-11-02 21:10:05,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:10:05,285 INFO L225 Difference]: With dead ends: 220 [2022-11-02 21:10:05,285 INFO L226 Difference]: Without dead ends: 178 [2022-11-02 21:10:05,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=558, Invalid=5604, Unknown=0, NotChecked=0, Total=6162 [2022-11-02 21:10:05,288 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 175 mSDsluCounter, 733 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 783 SdHoareTripleChecker+Invalid, 792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-02 21:10:05,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 783 Invalid, 792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 595 Invalid, 0 Unknown, 103 Unchecked, 0.7s Time] [2022-11-02 21:10:05,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-11-02 21:10:05,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 79. [2022-11-02 21:10:05,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 60 states have (on average 1.1333333333333333) internal successors, (68), 61 states have internal predecessors, (68), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2022-11-02 21:10:05,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2022-11-02 21:10:05,311 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 59 [2022-11-02 21:10:05,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:10:05,311 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2022-11-02 21:10:05,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 42 states have (on average 2.5952380952380953) internal successors, (109), 46 states have internal predecessors, (109), 12 states have call successors, (14), 4 states have call predecessors, (14), 11 states have return successors, (13), 11 states have call predecessors, (13), 12 states have call successors, (13) [2022-11-02 21:10:05,312 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2022-11-02 21:10:05,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-11-02 21:10:05,312 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:10:05,313 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1] [2022-11-02 21:10:05,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-02 21:10:05,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:10:05,521 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:10:05,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:10:05,521 INFO L85 PathProgramCache]: Analyzing trace with hash -160259518, now seen corresponding path program 2 times [2022-11-02 21:10:05,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:10:05,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256134514] [2022-11-02 21:10:05,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:10:05,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:10:05,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:10:05,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:05,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:10:05,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-02 21:10:05,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-02 21:10:05,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:05,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:05,678 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-02 21:10:05,678 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:10:05,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256134514] [2022-11-02 21:10:05,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256134514] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-02 21:10:05,679 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-02 21:10:05,679 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-02 21:10:05,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964334184] [2022-11-02 21:10:05,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-02 21:10:05,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-02 21:10:05,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:10:05,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-02 21:10:05,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-02 21:10:05,681 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand has 7 states, 6 states have (on average 6.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-02 21:10:05,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:10:05,738 INFO L93 Difference]: Finished difference Result 89 states and 99 transitions. [2022-11-02 21:10:05,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-02 21:10:05,741 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 6.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 1 states have call successors, (6) Word has length 59 [2022-11-02 21:10:05,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:10:05,741 INFO L225 Difference]: With dead ends: 89 [2022-11-02 21:10:05,742 INFO L226 Difference]: Without dead ends: 79 [2022-11-02 21:10:05,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-11-02 21:10:05,744 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 1 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-02 21:10:05,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 242 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-02 21:10:05,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-02 21:10:05,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-11-02 21:10:05,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 61 states have internal predecessors, (67), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (12), 8 states have call predecessors, (12), 8 states have call successors, (12) [2022-11-02 21:10:05,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 88 transitions. [2022-11-02 21:10:05,767 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 88 transitions. Word has length 59 [2022-11-02 21:10:05,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:10:05,768 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 88 transitions. [2022-11-02 21:10:05,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 6.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 3 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-02 21:10:05,768 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 88 transitions. [2022-11-02 21:10:05,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-02 21:10:05,769 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:10:05,769 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 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] [2022-11-02 21:10:05,769 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-11-02 21:10:05,769 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:10:05,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:10:05,769 INFO L85 PathProgramCache]: Analyzing trace with hash -1055504788, now seen corresponding path program 3 times [2022-11-02 21:10:05,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:10:05,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784869621] [2022-11-02 21:10:05,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:10:05,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:10:05,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:10:06,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:06,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:10:06,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-02 21:10:06,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-02 21:10:06,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:06,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:06,868 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 26 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-02 21:10:06,868 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:10:06,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784869621] [2022-11-02 21:10:06,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784869621] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:10:06,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313039494] [2022-11-02 21:10:06,869 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-02 21:10:06,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:10:06,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:10:06,870 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:10:06,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-02 21:10:07,230 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-02 21:10:07,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-02 21:10:07,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 107 conjunts are in the unsatisfiable core [2022-11-02 21:10:07,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:10:07,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:07,312 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:10:07,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:07,320 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:10:07,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:07,336 INFO L390 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2022-11-02 21:10:07,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:07,341 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 23 [2022-11-02 21:10:07,943 INFO L356 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-02 21:10:07,943 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 51 [2022-11-02 21:10:07,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:07,955 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 42 [2022-11-02 21:10:08,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:08,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:08,595 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-02 21:10:08,606 INFO L356 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-02 21:10:08,606 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 75 treesize of output 60 [2022-11-02 21:10:08,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:08,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-02 21:10:08,619 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 44 [2022-11-02 21:10:09,392 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 41 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-02 21:10:09,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:10:10,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313039494] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:10:10,469 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-02 21:10:10,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 31 [2022-11-02 21:10:10,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214785430] [2022-11-02 21:10:10,470 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-02 21:10:10,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-02 21:10:10,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:10:10,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-02 21:10:10,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1303, Unknown=0, NotChecked=0, Total=1482 [2022-11-02 21:10:10,472 INFO L87 Difference]: Start difference. First operand 79 states and 88 transitions. Second operand has 31 states, 29 states have (on average 2.793103448275862) internal successors, (81), 30 states have internal predecessors, (81), 11 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (12), 9 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-02 21:10:11,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-02 21:10:11,228 INFO L93 Difference]: Finished difference Result 130 states and 142 transitions. [2022-11-02 21:10:11,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-02 21:10:11,229 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.793103448275862) internal successors, (81), 30 states have internal predecessors, (81), 11 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (12), 9 states have call predecessors, (12), 10 states have call successors, (12) Word has length 60 [2022-11-02 21:10:11,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-02 21:10:11,230 INFO L225 Difference]: With dead ends: 130 [2022-11-02 21:10:11,230 INFO L226 Difference]: Without dead ends: 125 [2022-11-02 21:10:11,231 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 93 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=314, Invalid=2442, Unknown=0, NotChecked=0, Total=2756 [2022-11-02 21:10:11,232 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 109 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 539 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-02 21:10:11,232 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 539 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 179 Invalid, 0 Unknown, 65 Unchecked, 0.2s Time] [2022-11-02 21:10:11,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-02 21:10:11,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2022-11-02 21:10:11,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 92 states have (on average 1.0869565217391304) internal successors, (100), 93 states have internal predecessors, (100), 13 states have call successors, (13), 13 states have call predecessors, (13), 14 states have return successors, (18), 13 states have call predecessors, (18), 12 states have call successors, (18) [2022-11-02 21:10:11,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 131 transitions. [2022-11-02 21:10:11,265 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 131 transitions. Word has length 60 [2022-11-02 21:10:11,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-02 21:10:11,265 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 131 transitions. [2022-11-02 21:10:11,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.793103448275862) internal successors, (81), 30 states have internal predecessors, (81), 11 states have call successors, (13), 5 states have call predecessors, (13), 7 states have return successors, (12), 9 states have call predecessors, (12), 10 states have call successors, (12) [2022-11-02 21:10:11,266 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 131 transitions. [2022-11-02 21:10:11,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-02 21:10:11,266 INFO L187 NwaCegarLoop]: Found error trace [2022-11-02 21:10:11,266 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-02 21:10:11,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-02 21:10:11,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-02 21:10:11,481 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-02 21:10:11,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-02 21:10:11,481 INFO L85 PathProgramCache]: Analyzing trace with hash 1013838843, now seen corresponding path program 4 times [2022-11-02 21:10:11,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-11-02 21:10:11,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527612051] [2022-11-02 21:10:11,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-02 21:10:11,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-02 21:10:11,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-11-02 21:10:12,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:12,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2022-11-02 21:10:12,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-11-02 21:10:12,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,257 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2022-11-02 21:10:12,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:12,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2022-11-02 21:10:12,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-02 21:10:12,432 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 32 proven. 10 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-02 21:10:12,433 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-11-02 21:10:12,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527612051] [2022-11-02 21:10:12,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [527612051] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:10:12,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300269215] [2022-11-02 21:10:12,433 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-02 21:10:12,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-02 21:10:12,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 [2022-11-02 21:10:12,435 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-02 21:10:12,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fef09c87-c526-4cdc-9a86-b0f72fe91a7a/bin/uautomizer-Dbtcem3rbc/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-02 21:10:12,700 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-02 21:10:12,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-02 21:10:12,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 153 conjunts are in the unsatisfiable core [2022-11-02 21:10:12,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-02 21:10:12,763 INFO L356 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2022-11-02 21:10:12,764 INFO L390 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 2 case distinctions, treesize of input 39 treesize of output 36 [2022-11-02 21:10:12,799 INFO L356 Elim1Store]: treesize reduction 76, result has 36.1 percent of original size [2022-11-02 21:10:12,800 INFO L390 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 2 case distinctions, treesize of input 63 treesize of output 52 [2022-11-02 21:10:15,850 INFO L356 Elim1Store]: treesize reduction 219, result has 22.1 percent of original size [2022-11-02 21:10:15,850 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 182 treesize of output 165 [2022-11-02 21:10:15,924 INFO L356 Elim1Store]: treesize reduction 171, result has 20.5 percent of original size [2022-11-02 21:10:15,924 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 151 treesize of output 131 [2022-11-02 21:10:26,661 WARN L234 SmtUtils]: Spent 10.18s on a formula simplification. DAG size of input: 62 DAG size of output: 38 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-02 21:10:28,040 INFO L356 Elim1Store]: treesize reduction 56, result has 35.6 percent of original size [2022-11-02 21:10:28,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 136 treesize of output 131 [2022-11-02 21:10:28,081 INFO L356 Elim1Store]: treesize reduction 58, result has 33.3 percent of original size [2022-11-02 21:10:28,082 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 119 treesize of output 112 [2022-11-02 21:10:31,490 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 21 proven. 52 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-02 21:10:31,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-02 21:11:28,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300269215] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-02 21:11:28,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-02 21:11:28,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 20] total 32 [2022-11-02 21:11:28,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361872659] [2022-11-02 21:11:28,510 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-02 21:11:28,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-02 21:11:28,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-11-02 21:11:28,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-02 21:11:28,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1456, Unknown=16, NotChecked=0, Total=1640 [2022-11-02 21:11:28,512 INFO L87 Difference]: Start difference. First operand 120 states and 131 transitions. Second operand has 32 states, 29 states have (on average 3.0) internal successors, (87), 31 states have internal predecessors, (87), 13 states have call successors, (15), 5 states have call predecessors, (15), 9 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14)