./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF --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 06e8f3b5d2ce31d1088d1852191b4960da9738d8116cb1cbdca2e60a833578cb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 05:36:22,303 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 05:36:22,306 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 05:36:22,351 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 05:36:22,351 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 05:36:22,353 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 05:36:22,355 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 05:36:22,357 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 05:36:22,359 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 05:36:22,361 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 05:36:22,362 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 05:36:22,363 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 05:36:22,364 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 05:36:22,367 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 05:36:22,369 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 05:36:22,372 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 05:36:22,374 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 05:36:22,382 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 05:36:22,387 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 05:36:22,390 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 05:36:22,392 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 05:36:22,396 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 05:36:22,400 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 05:36:22,401 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 05:36:22,405 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 05:36:22,405 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 05:36:22,405 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 05:36:22,407 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 05:36:22,407 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 05:36:22,408 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 05:36:22,409 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 05:36:22,410 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 05:36:22,411 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 05:36:22,412 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 05:36:22,413 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 05:36:22,413 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 05:36:22,414 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 05:36:22,415 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 05:36:22,425 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 05:36:22,426 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 05:36:22,427 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 05:36:22,428 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-20 05:36:22,464 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 05:36:22,465 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 05:36:22,465 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 05:36:22,465 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 05:36:22,466 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 05:36:22,466 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 05:36:22,467 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 05:36:22,467 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 05:36:22,468 INFO L138 SettingsManager]: * Use SBE=true [2021-11-20 05:36:22,468 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 05:36:22,468 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 05:36:22,468 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 05:36:22,469 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 05:36:22,469 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 05:36:22,469 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 05:36:22,469 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 05:36:22,470 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 05:36:22,470 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 05:36:22,470 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 05:36:22,470 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 05:36:22,471 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 05:36:22,471 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 05:36:22,471 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-20 05:36:22,471 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 05:36:22,472 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 05:36:22,472 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 05:36:22,472 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 05:36:22,472 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 05:36:22,473 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-20 05:36:22,473 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 05:36:22,473 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-20 05:36:22,473 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-20 05:36:22,474 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 05:36:22,474 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 05:36:22,474 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_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 06e8f3b5d2ce31d1088d1852191b4960da9738d8116cb1cbdca2e60a833578cb [2021-11-20 05:36:22,755 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 05:36:22,784 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 05:36:22,787 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 05:36:22,788 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 05:36:22,789 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 05:36:22,791 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/../../sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound50.c [2021-11-20 05:36:22,882 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/data/2c3a71097/25a01043e4be46daaaf8990eb1bab435/FLAG9c0206e09 [2021-11-20 05:36:23,362 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 05:36:23,362 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound50.c [2021-11-20 05:36:23,374 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/data/2c3a71097/25a01043e4be46daaaf8990eb1bab435/FLAG9c0206e09 [2021-11-20 05:36:23,742 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/data/2c3a71097/25a01043e4be46daaaf8990eb1bab435 [2021-11-20 05:36:23,745 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 05:36:23,747 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 05:36:23,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 05:36:23,749 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 05:36:23,761 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 05:36:23,762 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 05:36:23" (1/1) ... [2021-11-20 05:36:23,762 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40bab1a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:23, skipping insertion in model container [2021-11-20 05:36:23,763 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 05:36:23" (1/1) ... [2021-11-20 05:36:23,770 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 05:36:23,785 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 05:36:23,947 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_5f3a2866-780f-4853-9a53-2b889acd643a/sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound50.c[537,550] [2021-11-20 05:36:23,967 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 05:36:23,977 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 05:36:24,002 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_5f3a2866-780f-4853-9a53-2b889acd643a/sv-benchmarks/c/nla-digbench-scaling/prodbin-ll_unwindbound50.c[537,550] [2021-11-20 05:36:24,021 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 05:36:24,037 INFO L208 MainTranslator]: Completed translation [2021-11-20 05:36:24,038 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24 WrapperNode [2021-11-20 05:36:24,038 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 05:36:24,039 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 05:36:24,040 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 05:36:24,040 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 05:36:24,048 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,055 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,079 INFO L137 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 48 [2021-11-20 05:36:24,079 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 05:36:24,080 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 05:36:24,080 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 05:36:24,081 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 05:36:24,089 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,089 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,100 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,100 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,109 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,117 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,119 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,122 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 05:36:24,127 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 05:36:24,127 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 05:36:24,128 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 05:36:24,130 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (1/1) ... [2021-11-20 05:36:24,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 05:36:24,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:36:24,169 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 05:36:24,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 05:36:24,231 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 05:36:24,231 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 05:36:24,232 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 05:36:24,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 05:36:24,232 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-20 05:36:24,232 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-20 05:36:24,301 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 05:36:24,303 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 05:36:24,418 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 05:36:24,425 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 05:36:24,425 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 05:36:24,427 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 05:36:24 BoogieIcfgContainer [2021-11-20 05:36:24,427 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 05:36:24,429 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 05:36:24,429 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 05:36:24,433 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 05:36:24,433 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 05:36:23" (1/3) ... [2021-11-20 05:36:24,434 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54c99b8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 05:36:24, skipping insertion in model container [2021-11-20 05:36:24,434 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:36:24" (2/3) ... [2021-11-20 05:36:24,435 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54c99b8c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 05:36:24, skipping insertion in model container [2021-11-20 05:36:24,435 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 05:36:24" (3/3) ... [2021-11-20 05:36:24,436 INFO L111 eAbstractionObserver]: Analyzing ICFG prodbin-ll_unwindbound50.c [2021-11-20 05:36:24,442 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 05:36:24,442 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 05:36:24,492 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 05:36:24,500 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 05:36:24,500 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 05:36:24,517 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:24,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 05:36:24,522 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:24,523 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:24,523 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:24,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:24,529 INFO L85 PathProgramCache]: Analyzing trace with hash -572597424, now seen corresponding path program 1 times [2021-11-20 05:36:24,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:24,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96934656] [2021-11-20 05:36:24,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:24,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:24,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:24,663 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:24,664 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:36:24,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96934656] [2021-11-20 05:36:24,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96934656] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 05:36:24,665 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 05:36:24,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 05:36:24,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179494730] [2021-11-20 05:36:24,668 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 05:36:24,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 05:36:24,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:36:24,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 05:36:24,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 05:36:24,722 INFO L87 Difference]: Start difference. First operand has 21 states, 16 states have (on average 1.4375) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 05:36:24,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:36:24,741 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-11-20 05:36:24,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 05:36:24,743 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-20 05:36:24,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:36:24,751 INFO L225 Difference]: With dead ends: 39 [2021-11-20 05:36:24,751 INFO L226 Difference]: Without dead ends: 17 [2021-11-20 05:36:24,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 05:36:24,768 INFO L933 BasicCegarLoop]: 24 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, 24 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 [2021-11-20 05:36:24,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 05:36:24,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-20 05:36:24,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-20 05:36:24,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 05:36:24,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-20 05:36:24,805 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 9 [2021-11-20 05:36:24,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:36:24,806 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-20 05:36:24,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 05:36:24,807 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-20 05:36:24,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 05:36:24,807 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:24,808 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:24,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 05:36:24,808 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:24,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:24,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1986366499, now seen corresponding path program 1 times [2021-11-20 05:36:24,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:24,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278001814] [2021-11-20 05:36:24,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:24,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:24,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:24,878 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:24,879 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:36:24,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278001814] [2021-11-20 05:36:24,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278001814] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 05:36:24,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 05:36:24,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 05:36:24,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068737515] [2021-11-20 05:36:24,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 05:36:24,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 05:36:24,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:36:24,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 05:36:24,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 05:36:24,896 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 05:36:24,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:36:24,927 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2021-11-20 05:36:24,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 05:36:24,928 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 05:36:24,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:36:24,928 INFO L225 Difference]: With dead ends: 26 [2021-11-20 05:36:24,929 INFO L226 Difference]: Without dead ends: 19 [2021-11-20 05:36:24,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 05:36:24,931 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 05:36:24,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 05:36:24,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-20 05:36:24,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-20 05:36:24,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 05:36:24,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-20 05:36:24,943 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 10 [2021-11-20 05:36:24,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:36:24,943 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-20 05:36:24,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 05:36:24,944 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-20 05:36:24,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 05:36:24,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:24,945 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:24,945 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 05:36:24,945 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:24,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:24,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1984579039, now seen corresponding path program 1 times [2021-11-20 05:36:24,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:24,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32302712] [2021-11-20 05:36:24,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:24,953 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:24,968 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:36:24,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [91474036] [2021-11-20 05:36:24,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:24,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:24,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:36:24,972 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:36:25,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 05:36:25,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:25,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 05:36:25,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:36:25,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:25,184 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 05:36:25,184 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:36:25,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32302712] [2021-11-20 05:36:25,185 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:36:25,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91474036] [2021-11-20 05:36:25,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91474036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 05:36:25,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 05:36:25,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 05:36:25,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872185680] [2021-11-20 05:36:25,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 05:36:25,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 05:36:25,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:36:25,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 05:36:25,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 05:36:25,188 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 05:36:25,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:36:25,256 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-11-20 05:36:25,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 05:36:25,257 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 05:36:25,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:36:25,259 INFO L225 Difference]: With dead ends: 30 [2021-11-20 05:36:25,261 INFO L226 Difference]: Without dead ends: 28 [2021-11-20 05:36:25,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 05:36:25,263 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 05:36:25,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 51 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 05:36:25,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-20 05:36:25,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2021-11-20 05:36:25,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:25,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-11-20 05:36:25,278 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 10 [2021-11-20 05:36:25,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:36:25,278 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-11-20 05:36:25,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 05:36:25,279 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-11-20 05:36:25,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 05:36:25,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:25,282 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:25,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 05:36:25,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:25,507 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:25,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:25,508 INFO L85 PathProgramCache]: Analyzing trace with hash 845350648, now seen corresponding path program 1 times [2021-11-20 05:36:25,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:25,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766306893] [2021-11-20 05:36:25,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:25,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:25,522 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:36:25,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [975547977] [2021-11-20 05:36:25,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:25,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:25,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:36:25,528 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:36:25,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 05:36:25,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:25,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 05:36:25,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:36:25,664 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:25,664 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 05:36:25,665 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:36:25,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766306893] [2021-11-20 05:36:25,665 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:36:25,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975547977] [2021-11-20 05:36:25,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975547977] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 05:36:25,666 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 05:36:25,666 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 05:36:25,667 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214374955] [2021-11-20 05:36:25,667 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 05:36:25,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 05:36:25,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:36:25,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 05:36:25,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 05:36:25,669 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 05:36:25,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:36:25,730 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-11-20 05:36:25,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 05:36:25,731 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 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 16 [2021-11-20 05:36:25,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:36:25,732 INFO L225 Difference]: With dead ends: 34 [2021-11-20 05:36:25,732 INFO L226 Difference]: Without dead ends: 27 [2021-11-20 05:36:25,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-20 05:36:25,734 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 05:36:25,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 44 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 05:36:25,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-20 05:36:25,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2021-11-20 05:36:25,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:25,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-11-20 05:36:25,741 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 16 [2021-11-20 05:36:25,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:36:25,742 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-11-20 05:36:25,742 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-20 05:36:25,742 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-11-20 05:36:25,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 05:36:25,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:25,743 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:25,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 05:36:25,963 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:25,964 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:25,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:25,964 INFO L85 PathProgramCache]: Analyzing trace with hash 905454657, now seen corresponding path program 1 times [2021-11-20 05:36:25,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:25,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757304336] [2021-11-20 05:36:25,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:25,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:25,975 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:36:25,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [463350785] [2021-11-20 05:36:25,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:25,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:25,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:36:25,977 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:36:25,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 05:36:26,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:26,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 05:36:26,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:36:26,123 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:26,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:36:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:26,209 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:36:26,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757304336] [2021-11-20 05:36:26,209 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:36:26,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463350785] [2021-11-20 05:36:26,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463350785] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:36:26,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:36:26,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-11-20 05:36:26,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512865728] [2021-11-20 05:36:26,211 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:36:26,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 05:36:26,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:36:26,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 05:36:26,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-20 05:36:26,214 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:26,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:36:26,286 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-20 05:36:26,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 05:36:26,286 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-20 05:36:26,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:36:26,288 INFO L225 Difference]: With dead ends: 62 [2021-11-20 05:36:26,288 INFO L226 Difference]: Without dead ends: 55 [2021-11-20 05:36:26,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-20 05:36:26,290 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 33 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 05:36:26,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 83 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 05:36:26,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-20 05:36:26,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2021-11-20 05:36:26,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 42 states have internal predecessors, (50), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-20 05:36:26,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-20 05:36:26,300 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 20 [2021-11-20 05:36:26,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:36:26,301 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-20 05:36:26,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:26,301 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-20 05:36:26,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 05:36:26,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:26,302 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:26,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 05:36:26,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:26,527 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:26,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:26,528 INFO L85 PathProgramCache]: Analyzing trace with hash 907242117, now seen corresponding path program 1 times [2021-11-20 05:36:26,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:26,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534397241] [2021-11-20 05:36:26,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:26,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:26,539 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:36:26,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1623785864] [2021-11-20 05:36:26,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:26,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:26,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:36:26,542 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:36:26,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 05:36:26,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:26,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 05:36:26,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:36:29,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:29,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:36:38,990 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:36:38,991 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:36:38,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534397241] [2021-11-20 05:36:38,991 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:36:38,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623785864] [2021-11-20 05:36:38,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623785864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:36:38,991 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:36:38,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2021-11-20 05:36:38,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367459779] [2021-11-20 05:36:38,992 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:36:38,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 05:36:38,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:36:38,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 05:36:38,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=166, Unknown=4, NotChecked=0, Total=210 [2021-11-20 05:36:38,994 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:41,006 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:36:46,415 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:36:56,197 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:36:58,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:36:58,020 INFO L93 Difference]: Finished difference Result 87 states and 102 transitions. [2021-11-20 05:36:58,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 05:36:58,021 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-20 05:36:58,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:36:58,024 INFO L225 Difference]: With dead ends: 87 [2021-11-20 05:36:58,024 INFO L226 Difference]: Without dead ends: 85 [2021-11-20 05:36:58,025 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=102, Invalid=445, Unknown=5, NotChecked=0, Total=552 [2021-11-20 05:36:58,026 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 36 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 20 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.4s IncrementalHoareTripleChecker+Time [2021-11-20 05:36:58,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 113 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 148 Invalid, 3 Unknown, 0 Unchecked, 8.4s Time] [2021-11-20 05:36:58,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-20 05:36:58,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 80. [2021-11-20 05:36:58,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 67 states have internal predecessors, (76), 10 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 05:36:58,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 93 transitions. [2021-11-20 05:36:58,043 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 93 transitions. Word has length 20 [2021-11-20 05:36:58,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:36:58,043 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 93 transitions. [2021-11-20 05:36:58,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:36:58,044 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 93 transitions. [2021-11-20 05:36:58,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 05:36:58,045 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:36:58,045 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:36:58,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 05:36:58,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:58,265 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:36:58,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:36:58,266 INFO L85 PathProgramCache]: Analyzing trace with hash 97895491, now seen corresponding path program 1 times [2021-11-20 05:36:58,266 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:36:58,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825487334] [2021-11-20 05:36:58,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:58,266 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:36:58,274 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:36:58,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1695396876] [2021-11-20 05:36:58,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:36:58,274 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:36:58,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:36:58,275 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:36:58,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 05:36:58,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:36:58,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 05:36:58,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:37:04,574 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:37:04,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:37:05,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:37:05,867 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:37:05,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825487334] [2021-11-20 05:37:05,867 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:37:05,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695396876] [2021-11-20 05:37:05,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695396876] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:37:05,867 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:37:05,867 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 18 [2021-11-20 05:37:05,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845665275] [2021-11-20 05:37:05,868 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:37:05,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 05:37:05,868 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:37:05,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 05:37:05,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-20 05:37:05,870 INFO L87 Difference]: Start difference. First operand 80 states and 93 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:37:06,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:37:06,934 INFO L93 Difference]: Finished difference Result 115 states and 130 transitions. [2021-11-20 05:37:06,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 05:37:06,935 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-20 05:37:06,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:37:06,937 INFO L225 Difference]: With dead ends: 115 [2021-11-20 05:37:06,937 INFO L226 Difference]: Without dead ends: 104 [2021-11-20 05:37:06,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=174, Invalid=582, Unknown=0, NotChecked=0, Total=756 [2021-11-20 05:37:06,939 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 62 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 05:37:06,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 106 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 05:37:06,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-20 05:37:06,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 83. [2021-11-20 05:37:06,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 66 states have (on average 1.196969696969697) internal successors, (79), 68 states have internal predecessors, (79), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 05:37:06,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 95 transitions. [2021-11-20 05:37:06,953 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 95 transitions. Word has length 20 [2021-11-20 05:37:06,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:37:06,953 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 95 transitions. [2021-11-20 05:37:06,954 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-20 05:37:06,954 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 95 transitions. [2021-11-20 05:37:06,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 05:37:06,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:37:06,955 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:37:06,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 05:37:07,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:37:07,183 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:37:07,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:37:07,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1470880860, now seen corresponding path program 1 times [2021-11-20 05:37:07,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:37:07,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848509685] [2021-11-20 05:37:07,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:37:07,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:37:07,194 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:37:07,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1566228866] [2021-11-20 05:37:07,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:37:07,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:37:07,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:37:07,195 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:37:07,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 05:37:07,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:37:07,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 05:37:07,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:37:07,365 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 05:37:07,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:37:07,488 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 05:37:07,489 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:37:07,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848509685] [2021-11-20 05:37:07,489 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:37:07,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1566228866] [2021-11-20 05:37:07,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1566228866] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:37:07,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:37:07,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-11-20 05:37:07,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764869518] [2021-11-20 05:37:07,492 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:37:07,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 05:37:07,492 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:37:07,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 05:37:07,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-20 05:37:07,494 INFO L87 Difference]: Start difference. First operand 83 states and 95 transitions. Second operand has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 05:37:09,503 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:37:09,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:37:09,597 INFO L93 Difference]: Finished difference Result 92 states and 103 transitions. [2021-11-20 05:37:09,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 05:37:09,597 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-11-20 05:37:09,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:37:09,599 INFO L225 Difference]: With dead ends: 92 [2021-11-20 05:37:09,599 INFO L226 Difference]: Without dead ends: 82 [2021-11-20 05:37:09,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-20 05:37:09,601 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 22 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-20 05:37:09,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 51 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-20 05:37:09,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-20 05:37:09,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 80. [2021-11-20 05:37:09,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 64 states have (on average 1.140625) internal successors, (73), 66 states have internal predecessors, (73), 8 states have call successors, (8), 7 states have call predecessors, (8), 7 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 05:37:09,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 88 transitions. [2021-11-20 05:37:09,636 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 88 transitions. Word has length 26 [2021-11-20 05:37:09,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:37:09,637 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 88 transitions. [2021-11-20 05:37:09,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (3), 3 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-20 05:37:09,637 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 88 transitions. [2021-11-20 05:37:09,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 05:37:09,639 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:37:09,639 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:37:09,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 05:37:09,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:37:09,867 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:37:09,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:37:09,868 INFO L85 PathProgramCache]: Analyzing trace with hash -158147061, now seen corresponding path program 1 times [2021-11-20 05:37:09,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:37:09,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370397975] [2021-11-20 05:37:09,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:37:09,868 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:37:09,876 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:37:09,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [484190461] [2021-11-20 05:37:09,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:37:09,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:37:09,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:37:09,878 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:37:09,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 05:37:09,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 05:37:09,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 05:37:09,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:37:18,304 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 05:37:18,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:37:25,767 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 05:37:25,767 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:37:25,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370397975] [2021-11-20 05:37:25,768 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:37:25,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484190461] [2021-11-20 05:37:25,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484190461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:37:25,768 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:37:25,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11] total 24 [2021-11-20 05:37:25,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811991646] [2021-11-20 05:37:25,769 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:37:25,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-20 05:37:25,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:37:25,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-20 05:37:25,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2021-11-20 05:37:25,771 INFO L87 Difference]: Start difference. First operand 80 states and 88 transitions. Second operand has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 22 states have internal predecessors, (47), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-20 05:37:29,333 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:37:35,689 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:37:38,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:37:38,436 INFO L93 Difference]: Finished difference Result 125 states and 141 transitions. [2021-11-20 05:37:38,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 05:37:38,437 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 22 states have internal predecessors, (47), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 40 [2021-11-20 05:37:38,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:37:38,438 INFO L225 Difference]: With dead ends: 125 [2021-11-20 05:37:38,438 INFO L226 Difference]: Without dead ends: 123 [2021-11-20 05:37:38,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=190, Invalid=866, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 05:37:38,440 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 39 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 26 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 260 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2021-11-20 05:37:38,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 260 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 234 Invalid, 1 Unknown, 86 Unchecked, 5.8s Time] [2021-11-20 05:37:38,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-20 05:37:38,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 103. [2021-11-20 05:37:38,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 83 states have (on average 1.1566265060240963) internal successors, (96), 86 states have internal predecessors, (96), 11 states have call successors, (11), 8 states have call predecessors, (11), 8 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-11-20 05:37:38,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 117 transitions. [2021-11-20 05:37:38,466 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 117 transitions. Word has length 40 [2021-11-20 05:37:38,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:37:38,466 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 117 transitions. [2021-11-20 05:37:38,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 22 states have internal predecessors, (47), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-20 05:37:38,467 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 117 transitions. [2021-11-20 05:37:38,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 05:37:38,470 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:37:38,470 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:37:38,496 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 05:37:38,675 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-20 05:37:38,678 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:37:38,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:37:38,679 INFO L85 PathProgramCache]: Analyzing trace with hash -957536403, now seen corresponding path program 2 times [2021-11-20 05:37:38,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:37:38,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102131759] [2021-11-20 05:37:38,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:37:38,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:37:38,688 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:37:38,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6184589] [2021-11-20 05:37:38,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 05:37:38,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:37:38,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:37:38,695 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:37:38,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 05:37:38,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 05:37:38,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 05:37:38,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 05:37:38,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:37:38,944 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 8 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 05:37:38,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:37:39,124 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-20 05:37:39,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:37:39,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102131759] [2021-11-20 05:37:39,124 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:37:39,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6184589] [2021-11-20 05:37:39,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6184589] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:37:39,124 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:37:39,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2021-11-20 05:37:39,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943108172] [2021-11-20 05:37:39,125 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:37:39,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 05:37:39,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:37:39,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 05:37:39,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-11-20 05:37:39,126 INFO L87 Difference]: Start difference. First operand 103 states and 117 transitions. Second operand has 14 states, 14 states have (on average 5.0) internal successors, (70), 14 states have internal predecessors, (70), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-20 05:37:39,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:37:39,316 INFO L93 Difference]: Finished difference Result 307 states and 362 transitions. [2021-11-20 05:37:39,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 05:37:39,316 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 5.0) internal successors, (70), 14 states have internal predecessors, (70), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 50 [2021-11-20 05:37:39,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:37:39,320 INFO L225 Difference]: With dead ends: 307 [2021-11-20 05:37:39,321 INFO L226 Difference]: Without dead ends: 300 [2021-11-20 05:37:39,322 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2021-11-20 05:37:39,322 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 160 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 05:37:39,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 162 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 05:37:39,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 300 states. [2021-11-20 05:37:39,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 300 to 290. [2021-11-20 05:37:39,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 230 states have (on average 1.1304347826086956) internal successors, (260), 244 states have internal predecessors, (260), 34 states have call successors, (34), 25 states have call predecessors, (34), 25 states have return successors, (33), 20 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-20 05:37:39,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 327 transitions. [2021-11-20 05:37:39,371 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 327 transitions. Word has length 50 [2021-11-20 05:37:39,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:37:39,371 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 327 transitions. [2021-11-20 05:37:39,372 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 5.0) internal successors, (70), 14 states have internal predecessors, (70), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-20 05:37:39,372 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 327 transitions. [2021-11-20 05:37:39,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 05:37:39,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:37:39,374 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 05:37:39,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 05:37:39,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 05:37:39,599 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:37:39,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:37:39,600 INFO L85 PathProgramCache]: Analyzing trace with hash -493632277, now seen corresponding path program 2 times [2021-11-20 05:37:39,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:37:39,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902795426] [2021-11-20 05:37:39,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:37:39,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:37:39,612 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:37:39,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [641908463] [2021-11-20 05:37:39,620 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 05:37:39,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:37:39,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:37:39,621 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:37:39,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 05:37:39,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 05:37:39,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 05:37:39,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 05:37:39,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:37:52,381 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 12 proven. 56 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 05:37:52,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:38:12,802 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 42 proven. 18 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-20 05:38:12,802 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:38:12,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902795426] [2021-11-20 05:38:12,802 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:38:12,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641908463] [2021-11-20 05:38:12,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641908463] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:38:12,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:38:12,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13] total 26 [2021-11-20 05:38:12,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718151311] [2021-11-20 05:38:12,803 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:38:12,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 05:38:12,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:38:12,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 05:38:12,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=532, Unknown=3, NotChecked=0, Total=650 [2021-11-20 05:38:12,805 INFO L87 Difference]: Start difference. First operand 290 states and 327 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 05:38:27,297 WARN L227 SmtUtils]: Spent 11.99s on a formula simplification. DAG size of input: 102 DAG size of output: 36 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 05:38:29,310 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:38:30,917 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:38:31,992 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:38:59,075 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-11-20 05:39:07,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:39:07,770 INFO L93 Difference]: Finished difference Result 408 states and 472 transitions. [2021-11-20 05:39:07,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 05:39:07,771 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 50 [2021-11-20 05:39:07,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:39:07,775 INFO L225 Difference]: With dead ends: 408 [2021-11-20 05:39:07,775 INFO L226 Difference]: Without dead ends: 406 [2021-11-20 05:39:07,777 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 62.3s TimeCoverageRelationStatistics Valid=415, Invalid=1740, Unknown=7, NotChecked=0, Total=2162 [2021-11-20 05:39:07,778 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 114 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 94 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.8s IncrementalHoareTripleChecker+Time [2021-11-20 05:39:07,778 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 218 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 373 Invalid, 1 Unknown, 0 Unchecked, 10.8s Time] [2021-11-20 05:39:07,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-20 05:39:07,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 403. [2021-11-20 05:39:07,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 322 states have (on average 1.1335403726708075) internal successors, (365), 338 states have internal predecessors, (365), 49 states have call successors, (49), 31 states have call predecessors, (49), 31 states have return successors, (48), 33 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-20 05:39:07,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 462 transitions. [2021-11-20 05:39:07,825 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 462 transitions. Word has length 50 [2021-11-20 05:39:07,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:39:07,825 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 462 transitions. [2021-11-20 05:39:07,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-20 05:39:07,826 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 462 transitions. [2021-11-20 05:39:07,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 05:39:07,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:39:07,829 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 05:39:07,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 05:39:08,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 05:39:08,043 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:39:08,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:39:08,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1494161103, now seen corresponding path program 3 times [2021-11-20 05:39:08,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:39:08,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791045750] [2021-11-20 05:39:08,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:39:08,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:39:08,056 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:39:08,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [572358277] [2021-11-20 05:39:08,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 05:39:08,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:39:08,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:39:08,059 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:39:08,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 05:39:08,131 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 05:39:08,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 05:39:08,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 05:39:08,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 05:39:09,646 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 75 proven. 14 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 05:39:09,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 05:39:10,764 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 69 proven. 23 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-20 05:39:10,764 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-20 05:39:10,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791045750] [2021-11-20 05:39:10,765 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-20 05:39:10,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572358277] [2021-11-20 05:39:10,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572358277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 05:39:10,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 05:39:10,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-20 05:39:10,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412925542] [2021-11-20 05:39:10,766 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 05:39:10,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 05:39:10,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-20 05:39:10,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 05:39:10,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-11-20 05:39:10,768 INFO L87 Difference]: Start difference. First operand 403 states and 462 transitions. Second operand has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 21 states have internal predecessors, (57), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-20 05:39:11,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 05:39:11,905 INFO L93 Difference]: Finished difference Result 478 states and 545 transitions. [2021-11-20 05:39:11,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 05:39:11,905 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 21 states have internal predecessors, (57), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 60 [2021-11-20 05:39:11,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 05:39:11,909 INFO L225 Difference]: With dead ends: 478 [2021-11-20 05:39:11,910 INFO L226 Difference]: Without dead ends: 476 [2021-11-20 05:39:11,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 98 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=166, Invalid=590, Unknown=0, NotChecked=0, Total=756 [2021-11-20 05:39:11,912 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 30 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 05:39:11,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 192 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 05:39:11,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2021-11-20 05:39:11,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 202. [2021-11-20 05:39:11,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 162 states have (on average 1.154320987654321) internal successors, (187), 163 states have internal predecessors, (187), 20 states have call successors, (20), 19 states have call predecessors, (20), 19 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-20 05:39:11,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 226 transitions. [2021-11-20 05:39:11,938 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 226 transitions. Word has length 60 [2021-11-20 05:39:11,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 05:39:11,938 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 226 transitions. [2021-11-20 05:39:11,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.590909090909091) internal successors, (57), 21 states have internal predecessors, (57), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-20 05:39:11,939 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 226 transitions. [2021-11-20 05:39:11,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-20 05:39:11,940 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 05:39:11,940 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1] [2021-11-20 05:39:11,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 05:39:12,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:39:12,143 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 05:39:12,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 05:39:12,144 INFO L85 PathProgramCache]: Analyzing trace with hash 722276717, now seen corresponding path program 2 times [2021-11-20 05:39:12,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-20 05:39:12,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454877530] [2021-11-20 05:39:12,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 05:39:12,144 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 05:39:12,150 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-20 05:39:12,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [766249354] [2021-11-20 05:39:12,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-20 05:39:12,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 05:39:12,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 [2021-11-20 05:39:12,161 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 05:39:12,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5f3a2866-780f-4853-9a53-2b889acd643a/bin/uautomizer-DQz5hQGWxF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 05:39:12,227 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-20 05:39:12,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 05:39:12,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-20 05:39:12,232 INFO L286 TraceCheckSpWp]: Computing forward predicates...