./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-12-06 21:58:35,758 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-06 21:58:35,760 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-06 21:58:35,791 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-06 21:58:35,792 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-06 21:58:35,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-06 21:58:35,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-06 21:58:35,795 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-06 21:58:35,797 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-06 21:58:35,798 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-06 21:58:35,798 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-06 21:58:35,799 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-06 21:58:35,800 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-06 21:58:35,801 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-06 21:58:35,802 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-06 21:58:35,803 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-06 21:58:35,804 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-06 21:58:35,804 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-06 21:58:35,806 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-06 21:58:35,808 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-06 21:58:35,809 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-06 21:58:35,810 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-06 21:58:35,811 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-06 21:58:35,812 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-06 21:58:35,815 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-06 21:58:35,815 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-06 21:58:35,815 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-06 21:58:35,816 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-06 21:58:35,816 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-06 21:58:35,817 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-06 21:58:35,817 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-06 21:58:35,818 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-06 21:58:35,819 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-06 21:58:35,819 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-06 21:58:35,820 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-06 21:58:35,820 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-06 21:58:35,821 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-06 21:58:35,821 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-06 21:58:35,821 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-06 21:58:35,821 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-06 21:58:35,822 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-06 21:58:35,822 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-06 21:58:35,839 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-06 21:58:35,839 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-06 21:58:35,839 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-06 21:58:35,839 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-06 21:58:35,840 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-06 21:58:35,840 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-06 21:58:35,840 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-06 21:58:35,840 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * Use SBE=true [2021-12-06 21:58:35,841 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-06 21:58:35,841 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-06 21:58:35,842 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-06 21:58:35,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-06 21:58:35,842 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-06 21:58:35,843 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-06 21:58:35,843 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_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1aca3c96522e618238f11f200c96e0ec490e756d4e04895bd2a51f9a4ff85af1 [2021-12-06 21:58:36,017 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-06 21:58:36,036 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-06 21:58:36,038 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-06 21:58:36,039 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-06 21:58:36,040 INFO L275 PluginConnector]: CDTParser initialized [2021-12-06 21:58:36,041 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/../../sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2021-12-06 21:58:36,081 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/data/be52b44dd/906d8d02c31e48b8ab0f8fce21048228/FLAG1b9002d38 [2021-12-06 21:58:36,425 INFO L306 CDTParser]: Found 1 translation units. [2021-12-06 21:58:36,425 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c [2021-12-06 21:58:36,430 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/data/be52b44dd/906d8d02c31e48b8ab0f8fce21048228/FLAG1b9002d38 [2021-12-06 21:58:36,861 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/data/be52b44dd/906d8d02c31e48b8ab0f8fce21048228 [2021-12-06 21:58:36,864 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-06 21:58:36,866 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-06 21:58:36,867 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-06 21:58:36,868 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-06 21:58:36,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-06 21:58:36,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 09:58:36" (1/1) ... [2021-12-06 21:58:36,873 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3090560c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:36, skipping insertion in model container [2021-12-06 21:58:36,873 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.12 09:58:36" (1/1) ... [2021-12-06 21:58:36,879 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-06 21:58:36,889 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-06 21:58:36,999 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_2191254e-33f3-4cd8-8d2e-4f3134864be9/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2021-12-06 21:58:37,016 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-06 21:58:37,023 INFO L203 MainTranslator]: Completed pre-run [2021-12-06 21:58:37,032 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_2191254e-33f3-4cd8-8d2e-4f3134864be9/sv-benchmarks/c/nla-digbench-scaling/egcd3-ll_valuebound5.c[490,503] [2021-12-06 21:58:37,041 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-06 21:58:37,051 INFO L208 MainTranslator]: Completed translation [2021-12-06 21:58:37,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37 WrapperNode [2021-12-06 21:58:37,051 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-06 21:58:37,052 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-06 21:58:37,052 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-06 21:58:37,052 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-06 21:58:37,057 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,062 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,076 INFO L137 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 80 [2021-12-06 21:58:37,076 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-06 21:58:37,077 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-06 21:58:37,077 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-06 21:58:37,077 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-06 21:58:37,083 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,083 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,085 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,085 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,087 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,090 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,091 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-06 21:58:37,093 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-06 21:58:37,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-06 21:58:37,093 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-06 21:58:37,094 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (1/1) ... [2021-12-06 21:58:37,100 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-06 21:58:37,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:37,118 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-06 21:58:37,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-06 21:58:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-06 21:58:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-12-06 21:58:37,147 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-12-06 21:58:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-06 21:58:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-06 21:58:37,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-06 21:58:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-06 21:58:37,148 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-06 21:58:37,195 INFO L236 CfgBuilder]: Building ICFG [2021-12-06 21:58:37,197 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-06 21:58:37,293 INFO L277 CfgBuilder]: Performing block encoding [2021-12-06 21:58:37,298 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-06 21:58:37,298 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-12-06 21:58:37,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 09:58:37 BoogieIcfgContainer [2021-12-06 21:58:37,300 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-06 21:58:37,301 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-06 21:58:37,301 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-06 21:58:37,304 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-06 21:58:37,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.12 09:58:36" (1/3) ... [2021-12-06 21:58:37,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b34edcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.12 09:58:37, skipping insertion in model container [2021-12-06 21:58:37,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.12 09:58:37" (2/3) ... [2021-12-06 21:58:37,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b34edcf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.12 09:58:37, skipping insertion in model container [2021-12-06 21:58:37,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.12 09:58:37" (3/3) ... [2021-12-06 21:58:37,308 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd3-ll_valuebound5.c [2021-12-06 21:58:37,313 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-06 21:58:37,313 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-06 21:58:37,354 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-06 21:58:37,360 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-06 21:58:37,360 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-06 21:58:37,373 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-12-06 21:58:37,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-12-06 21:58:37,377 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:37,378 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:37,378 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:37,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:37,382 INFO L85 PathProgramCache]: Analyzing trace with hash 872320404, now seen corresponding path program 1 times [2021-12-06 21:58:37,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:37,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256340525] [2021-12-06 21:58:37,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:37,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:37,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:37,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-06 21:58:37,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:37,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-06 21:58:37,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:37,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-06 21:58:37,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:37,511 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-12-06 21:58:37,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:37,523 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:37,524 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:37,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256340525] [2021-12-06 21:58:37,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256340525] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:37,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:37,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-12-06 21:58:37,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979560516] [2021-12-06 21:58:37,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:37,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-12-06 21:58:37,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:37,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-12-06 21:58:37,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-06 21:58:37,551 INFO L87 Difference]: Start difference. First operand has 35 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-06 21:58:37,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:37,568 INFO L93 Difference]: Finished difference Result 67 states and 109 transitions. [2021-12-06 21:58:37,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-12-06 21:58:37,570 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-12-06 21:58:37,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:37,576 INFO L225 Difference]: With dead ends: 67 [2021-12-06 21:58:37,576 INFO L226 Difference]: Without dead ends: 31 [2021-12-06 21:58:37,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-12-06 21:58:37,581 INFO L933 BasicCegarLoop]: 44 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, 44 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 [2021-12-06 21:58:37,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:37,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-12-06 21:58:37,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-12-06 21:58:37,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-06 21:58:37,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2021-12-06 21:58:37,610 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 29 [2021-12-06 21:58:37,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:37,611 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2021-12-06 21:58:37,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-06 21:58:37,611 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2021-12-06 21:58:37,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-12-06 21:58:37,613 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:37,613 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:37,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-06 21:58:37,613 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:37,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:37,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1714405113, now seen corresponding path program 1 times [2021-12-06 21:58:37,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:37,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213243936] [2021-12-06 21:58:37,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:37,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:37,636 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:37,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [961002041] [2021-12-06 21:58:37,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:37,637 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:37,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:37,638 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:37,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-06 21:58:37,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:37,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-06 21:58:37,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:37,783 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-06 21:58:37,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:58:37,784 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:37,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213243936] [2021-12-06 21:58:37,784 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:37,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961002041] [2021-12-06 21:58:37,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961002041] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:37,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:37,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-12-06 21:58:37,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871133023] [2021-12-06 21:58:37,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:37,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 21:58:37,786 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:37,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 21:58:37,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:58:37,787 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:37,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:37,857 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-12-06 21:58:37,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:58:37,858 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 30 [2021-12-06 21:58:37,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:37,859 INFO L225 Difference]: With dead ends: 50 [2021-12-06 21:58:37,859 INFO L226 Difference]: Without dead ends: 43 [2021-12-06 21:58:37,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-12-06 21:58:37,862 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 31 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:37,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 135 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:37,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-12-06 21:58:37,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2021-12-06 21:58:37,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 22 states have internal predecessors, (25), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-12-06 21:58:37,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2021-12-06 21:58:37,874 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 30 [2021-12-06 21:58:37,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:37,875 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2021-12-06 21:58:37,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:37,875 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2021-12-06 21:58:37,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-12-06 21:58:37,876 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:37,876 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:37,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-06 21:58:38,077 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:38,078 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:38,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:38,081 INFO L85 PathProgramCache]: Analyzing trace with hash -1825736765, now seen corresponding path program 1 times [2021-12-06 21:58:38,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:38,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976955459] [2021-12-06 21:58:38,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:38,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:38,142 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:38,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1187819904] [2021-12-06 21:58:38,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:38,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:38,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:38,147 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:38,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-06 21:58:38,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:38,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-06 21:58:38,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:38,383 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:38,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:58:38,383 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:38,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976955459] [2021-12-06 21:58:38,383 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:38,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187819904] [2021-12-06 21:58:38,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187819904] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:38,384 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:38,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:58:38,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115974150] [2021-12-06 21:58:38,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:38,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:58:38,384 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:38,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:58:38,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:58:38,385 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:38,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:38,419 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2021-12-06 21:58:38,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-06 21:58:38,419 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 33 [2021-12-06 21:58:38,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:38,421 INFO L225 Difference]: With dead ends: 49 [2021-12-06 21:58:38,421 INFO L226 Difference]: Without dead ends: 47 [2021-12-06 21:58:38,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:58:38,422 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 9 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:38,423 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 146 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:38,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-12-06 21:58:38,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-12-06 21:58:38,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-12-06 21:58:38,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions. [2021-12-06 21:58:38,433 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 33 [2021-12-06 21:58:38,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:38,434 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 60 transitions. [2021-12-06 21:58:38,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:38,434 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions. [2021-12-06 21:58:38,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-12-06 21:58:38,435 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:38,436 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:38,455 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-12-06 21:58:38,636 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-12-06 21:58:38,638 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:38,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:38,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1547103247, now seen corresponding path program 1 times [2021-12-06 21:58:38,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:38,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386475326] [2021-12-06 21:58:38,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:38,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:38,696 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:38,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [952959269] [2021-12-06 21:58:38,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:38,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:38,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:38,700 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:38,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-12-06 21:58:38,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:38,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-06 21:58:38,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:38,860 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-06 21:58:38,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:58:38,938 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-12-06 21:58:38,938 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:38,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386475326] [2021-12-06 21:58:38,938 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:38,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952959269] [2021-12-06 21:58:38,939 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952959269] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:58:38,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:58:38,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-12-06 21:58:38,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511297832] [2021-12-06 21:58:38,940 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 21:58:38,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-12-06 21:58:38,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:38,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-12-06 21:58:38,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-12-06 21:58:38,941 INFO L87 Difference]: Start difference. First operand 46 states and 60 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-06 21:58:39,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:39,047 INFO L93 Difference]: Finished difference Result 99 states and 139 transitions. [2021-12-06 21:58:39,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-06 21:58:39,048 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-12-06 21:58:39,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:39,049 INFO L225 Difference]: With dead ends: 99 [2021-12-06 21:58:39,049 INFO L226 Difference]: Without dead ends: 92 [2021-12-06 21:58:39,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2021-12-06 21:58:39,051 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 60 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:39,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 224 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:58:39,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-12-06 21:58:39,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 67. [2021-12-06 21:58:39,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 47 states have internal predecessors, (58), 17 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-06 21:58:39,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 91 transitions. [2021-12-06 21:58:39,064 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 91 transitions. Word has length 35 [2021-12-06 21:58:39,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:39,064 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 91 transitions. [2021-12-06 21:58:39,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-12-06 21:58:39,064 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 91 transitions. [2021-12-06 21:58:39,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-06 21:58:39,065 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:39,065 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:39,084 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-12-06 21:58:39,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:39,267 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:39,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:39,269 INFO L85 PathProgramCache]: Analyzing trace with hash -720434099, now seen corresponding path program 1 times [2021-12-06 21:58:39,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:39,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865261197] [2021-12-06 21:58:39,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:39,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:39,320 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:39,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1519300342] [2021-12-06 21:58:39,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:39,321 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:39,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:39,324 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:39,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-12-06 21:58:39,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:39,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 9 conjunts are in the unsatisfiable core [2021-12-06 21:58:39,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:39,483 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:39,483 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:58:39,483 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:39,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865261197] [2021-12-06 21:58:39,483 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:39,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519300342] [2021-12-06 21:58:39,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519300342] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:39,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:39,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:58:39,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659706665] [2021-12-06 21:58:39,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:39,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:58:39,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:39,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:58:39,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:58:39,485 INFO L87 Difference]: Start difference. First operand 67 states and 91 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-06 21:58:39,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:39,514 INFO L93 Difference]: Finished difference Result 75 states and 98 transitions. [2021-12-06 21:58:39,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-06 21:58:39,514 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2021-12-06 21:58:39,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:39,515 INFO L225 Difference]: With dead ends: 75 [2021-12-06 21:58:39,515 INFO L226 Difference]: Without dead ends: 73 [2021-12-06 21:58:39,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:58:39,516 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 9 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 142 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 [2021-12-06 21:58:39,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 142 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:39,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-12-06 21:58:39,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2021-12-06 21:58:39,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 50 states have internal predecessors, (61), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-12-06 21:58:39,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 94 transitions. [2021-12-06 21:58:39,526 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 94 transitions. Word has length 38 [2021-12-06 21:58:39,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:39,527 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 94 transitions. [2021-12-06 21:58:39,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-06 21:58:39,527 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 94 transitions. [2021-12-06 21:58:39,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-12-06 21:58:39,528 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:39,528 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:39,547 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-12-06 21:58:39,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:39,730 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:39,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:39,731 INFO L85 PathProgramCache]: Analyzing trace with hash -376152117, now seen corresponding path program 1 times [2021-12-06 21:58:39,732 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:39,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368840414] [2021-12-06 21:58:39,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:39,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:39,777 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:39,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1513778948] [2021-12-06 21:58:39,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:39,778 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:39,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:39,780 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:39,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-12-06 21:58:39,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:39,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 19 conjunts are in the unsatisfiable core [2021-12-06 21:58:39,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:39,927 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:39,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:58:40,080 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:40,080 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:40,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368840414] [2021-12-06 21:58:40,080 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:40,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513778948] [2021-12-06 21:58:40,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513778948] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:58:40,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:58:40,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2021-12-06 21:58:40,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396159157] [2021-12-06 21:58:40,081 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 21:58:40,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-06 21:58:40,081 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:40,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-06 21:58:40,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-12-06 21:58:40,082 INFO L87 Difference]: Start difference. First operand 71 states and 94 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:40,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:40,121 INFO L93 Difference]: Finished difference Result 95 states and 125 transitions. [2021-12-06 21:58:40,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:58:40,122 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 38 [2021-12-06 21:58:40,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:40,125 INFO L225 Difference]: With dead ends: 95 [2021-12-06 21:58:40,125 INFO L226 Difference]: Without dead ends: 93 [2021-12-06 21:58:40,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-12-06 21:58:40,126 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 13 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:40,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 262 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 31 Unchecked, 0.0s Time] [2021-12-06 21:58:40,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-12-06 21:58:40,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2021-12-06 21:58:40,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 63 states have internal predecessors, (77), 21 states have call successors, (21), 5 states have call predecessors, (21), 5 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-12-06 21:58:40,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 118 transitions. [2021-12-06 21:58:40,143 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 118 transitions. Word has length 38 [2021-12-06 21:58:40,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:40,143 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 118 transitions. [2021-12-06 21:58:40,143 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:40,143 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 118 transitions. [2021-12-06 21:58:40,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-06 21:58:40,145 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:40,145 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:40,165 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-12-06 21:58:40,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-12-06 21:58:40,347 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:40,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:40,349 INFO L85 PathProgramCache]: Analyzing trace with hash 279172547, now seen corresponding path program 1 times [2021-12-06 21:58:40,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:40,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140798052] [2021-12-06 21:58:40,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:40,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:40,386 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:40,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1145566348] [2021-12-06 21:58:40,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:40,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:40,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:40,391 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:40,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-12-06 21:58:40,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:40,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-06 21:58:40,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:40,552 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-12-06 21:58:40,553 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:58:40,553 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:40,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140798052] [2021-12-06 21:58:40,553 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:40,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1145566348] [2021-12-06 21:58:40,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1145566348] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:40,553 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:40,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:58:40,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748200860] [2021-12-06 21:58:40,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:40,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:58:40,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:40,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:58:40,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:58:40,554 INFO L87 Difference]: Start difference. First operand 89 states and 118 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-06 21:58:40,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:40,588 INFO L93 Difference]: Finished difference Result 126 states and 175 transitions. [2021-12-06 21:58:40,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-06 21:58:40,589 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2021-12-06 21:58:40,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:40,591 INFO L225 Difference]: With dead ends: 126 [2021-12-06 21:58:40,591 INFO L226 Difference]: Without dead ends: 124 [2021-12-06 21:58:40,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:58:40,592 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 8 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:40,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 135 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:40,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-12-06 21:58:40,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 119. [2021-12-06 21:58:40,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 75 states have (on average 1.2666666666666666) internal successors, (95), 76 states have internal predecessors, (95), 37 states have call successors, (37), 6 states have call predecessors, (37), 6 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-12-06 21:58:40,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 168 transitions. [2021-12-06 21:58:40,613 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 168 transitions. Word has length 43 [2021-12-06 21:58:40,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:40,614 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 168 transitions. [2021-12-06 21:58:40,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-12-06 21:58:40,614 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 168 transitions. [2021-12-06 21:58:40,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-06 21:58:40,616 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:40,616 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:40,636 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-12-06 21:58:40,818 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-12-06 21:58:40,819 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:40,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:40,820 INFO L85 PathProgramCache]: Analyzing trace with hash -2141198011, now seen corresponding path program 1 times [2021-12-06 21:58:40,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:40,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072280789] [2021-12-06 21:58:40,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:40,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:40,853 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:40,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [340592521] [2021-12-06 21:58:40,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:40,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:40,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:40,857 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:40,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-12-06 21:58:40,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:40,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-06 21:58:40,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:41,085 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:41,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:58:41,119 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:41,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072280789] [2021-12-06 21:58:41,119 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:41,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340592521] [2021-12-06 21:58:41,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340592521] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 21:58:41,120 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 21:58:41,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-12-06 21:58:41,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764180541] [2021-12-06 21:58:41,120 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 21:58:41,120 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-12-06 21:58:41,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:41,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-12-06 21:58:41,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-12-06 21:58:41,121 INFO L87 Difference]: Start difference. First operand 119 states and 168 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-06 21:58:41,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:41,220 INFO L93 Difference]: Finished difference Result 133 states and 180 transitions. [2021-12-06 21:58:41,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-12-06 21:58:41,220 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 43 [2021-12-06 21:58:41,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:41,222 INFO L225 Difference]: With dead ends: 133 [2021-12-06 21:58:41,222 INFO L226 Difference]: Without dead ends: 131 [2021-12-06 21:58:41,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-12-06 21:58:41,223 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 27 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:41,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 242 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-06 21:58:41,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-12-06 21:58:41,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 127. [2021-12-06 21:58:41,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 81 states have (on average 1.2469135802469136) internal successors, (101), 82 states have internal predecessors, (101), 37 states have call successors, (37), 8 states have call predecessors, (37), 8 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-12-06 21:58:41,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 174 transitions. [2021-12-06 21:58:41,243 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 174 transitions. Word has length 43 [2021-12-06 21:58:41,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:41,244 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 174 transitions. [2021-12-06 21:58:41,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-06 21:58:41,244 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 174 transitions. [2021-12-06 21:58:41,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-12-06 21:58:41,245 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:41,245 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:41,265 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-12-06 21:58:41,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:41,447 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:41,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:41,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1796916029, now seen corresponding path program 2 times [2021-12-06 21:58:41,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:41,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150115595] [2021-12-06 21:58:41,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:41,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:41,482 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:41,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1178552888] [2021-12-06 21:58:41,483 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:58:41,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:41,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:41,486 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:41,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-12-06 21:58:41,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:58:41,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:58:41,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 5 conjunts are in the unsatisfiable core [2021-12-06 21:58:41,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:41,647 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-12-06 21:58:41,647 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:58:41,647 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:41,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150115595] [2021-12-06 21:58:41,647 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:41,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178552888] [2021-12-06 21:58:41,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178552888] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:41,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:41,648 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:58:41,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587905644] [2021-12-06 21:58:41,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:41,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:58:41,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:41,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:58:41,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:58:41,649 INFO L87 Difference]: Start difference. First operand 127 states and 174 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:41,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:41,702 INFO L93 Difference]: Finished difference Result 166 states and 226 transitions. [2021-12-06 21:58:41,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:58:41,702 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 43 [2021-12-06 21:58:41,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:41,703 INFO L225 Difference]: With dead ends: 166 [2021-12-06 21:58:41,708 INFO L226 Difference]: Without dead ends: 110 [2021-12-06 21:58:41,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-12-06 21:58:41,710 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 18 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:41,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 164 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:41,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-12-06 21:58:41,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2021-12-06 21:58:41,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 64 states have (on average 1.1875) internal successors, (76), 65 states have internal predecessors, (76), 29 states have call successors, (29), 8 states have call predecessors, (29), 8 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2021-12-06 21:58:41,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 133 transitions. [2021-12-06 21:58:41,719 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 133 transitions. Word has length 43 [2021-12-06 21:58:41,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:41,719 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 133 transitions. [2021-12-06 21:58:41,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-12-06 21:58:41,719 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 133 transitions. [2021-12-06 21:58:41,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-06 21:58:41,720 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:41,720 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:41,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-12-06 21:58:41,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:41,921 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:41,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:41,921 INFO L85 PathProgramCache]: Analyzing trace with hash -1189241395, now seen corresponding path program 1 times [2021-12-06 21:58:41,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:41,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700593887] [2021-12-06 21:58:41,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:41,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:41,932 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:41,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1563558806] [2021-12-06 21:58:41,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:41,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:41,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:41,933 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:41,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-12-06 21:58:41,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:41,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2021-12-06 21:58:41,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:42,022 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-06 21:58:42,023 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:58:42,023 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:42,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700593887] [2021-12-06 21:58:42,023 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:42,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563558806] [2021-12-06 21:58:42,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563558806] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:58:42,023 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:58:42,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:58:42,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098111029] [2021-12-06 21:58:42,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:58:42,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:58:42,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:42,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:58:42,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:58:42,024 INFO L87 Difference]: Start difference. First operand 102 states and 133 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-06 21:58:42,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:42,062 INFO L93 Difference]: Finished difference Result 154 states and 217 transitions. [2021-12-06 21:58:42,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-06 21:58:42,062 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 48 [2021-12-06 21:58:42,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:42,063 INFO L225 Difference]: With dead ends: 154 [2021-12-06 21:58:42,064 INFO L226 Difference]: Without dead ends: 152 [2021-12-06 21:58:42,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:58:42,064 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 9 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:42,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 146 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:58:42,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-12-06 21:58:42,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 136. [2021-12-06 21:58:42,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 73 states have (on average 1.1643835616438356) internal successors, (85), 80 states have internal predecessors, (85), 53 states have call successors, (53), 9 states have call predecessors, (53), 9 states have return successors, (52), 46 states have call predecessors, (52), 52 states have call successors, (52) [2021-12-06 21:58:42,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 190 transitions. [2021-12-06 21:58:42,079 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 190 transitions. Word has length 48 [2021-12-06 21:58:42,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:42,079 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 190 transitions. [2021-12-06 21:58:42,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-12-06 21:58:42,079 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 190 transitions. [2021-12-06 21:58:42,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-12-06 21:58:42,080 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:42,080 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:42,100 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-12-06 21:58:42,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-12-06 21:58:42,282 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:42,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:42,283 INFO L85 PathProgramCache]: Analyzing trace with hash -828341661, now seen corresponding path program 1 times [2021-12-06 21:58:42,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:42,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321084264] [2021-12-06 21:58:42,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:42,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:42,314 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:42,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [301130910] [2021-12-06 21:58:42,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:42,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:42,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:42,318 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:42,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-12-06 21:58:42,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:42,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 57 conjunts are in the unsatisfiable core [2021-12-06 21:58:42,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:58:42,857 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-06 21:58:42,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:58:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 15 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-12-06 21:58:49,716 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:58:49,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321084264] [2021-12-06 21:58:49,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:58:49,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301130910] [2021-12-06 21:58:49,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301130910] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:58:49,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:58:49,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 23 [2021-12-06 21:58:49,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232870913] [2021-12-06 21:58:49,717 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 21:58:49,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-12-06 21:58:49,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:58:49,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-12-06 21:58:49,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=417, Unknown=1, NotChecked=0, Total=506 [2021-12-06 21:58:49,719 INFO L87 Difference]: Start difference. First operand 136 states and 190 transitions. Second operand has 23 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-12-06 21:58:59,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:58:59,547 INFO L93 Difference]: Finished difference Result 310 states and 449 transitions. [2021-12-06 21:58:59,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-12-06 21:58:59,547 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 60 [2021-12-06 21:58:59,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:58:59,549 INFO L225 Difference]: With dead ends: 310 [2021-12-06 21:58:59,549 INFO L226 Difference]: Without dead ends: 241 [2021-12-06 21:58:59,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=548, Invalid=2207, Unknown=1, NotChecked=0, Total=2756 [2021-12-06 21:58:59,551 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 127 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 778 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 1044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 778 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-12-06 21:58:59,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 392 Invalid, 1044 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 778 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-12-06 21:58:59,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-12-06 21:58:59,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 199. [2021-12-06 21:58:59,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 114 states have (on average 1.1754385964912282) internal successors, (134), 121 states have internal predecessors, (134), 73 states have call successors, (73), 11 states have call predecessors, (73), 11 states have return successors, (72), 66 states have call predecessors, (72), 72 states have call successors, (72) [2021-12-06 21:58:59,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 279 transitions. [2021-12-06 21:58:59,583 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 279 transitions. Word has length 60 [2021-12-06 21:58:59,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:58:59,583 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 279 transitions. [2021-12-06 21:58:59,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 20 states have (on average 2.15) internal successors, (43), 20 states have internal predecessors, (43), 6 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-12-06 21:58:59,583 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 279 transitions. [2021-12-06 21:58:59,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-12-06 21:58:59,584 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:58:59,584 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:58:59,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-12-06 21:58:59,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-12-06 21:58:59,786 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:58:59,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:58:59,787 INFO L85 PathProgramCache]: Analyzing trace with hash 1607561902, now seen corresponding path program 1 times [2021-12-06 21:58:59,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:58:59,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115122952] [2021-12-06 21:58:59,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:59,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:58:59,822 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:58:59,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1763275638] [2021-12-06 21:58:59,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:58:59,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:58:59,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:58:59,825 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:58:59,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-12-06 21:58:59,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:58:59,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 26 conjunts are in the unsatisfiable core [2021-12-06 21:58:59,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:59:00,042 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-12-06 21:59:00,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:59:00,177 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-12-06 21:59:00,178 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:59:00,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115122952] [2021-12-06 21:59:00,178 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:59:00,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1763275638] [2021-12-06 21:59:00,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1763275638] provided 1 perfect and 1 imperfect interpolant sequences [2021-12-06 21:59:00,178 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-06 21:59:00,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12] total 14 [2021-12-06 21:59:00,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524761978] [2021-12-06 21:59:00,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:59:00,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-12-06 21:59:00,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:00,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-12-06 21:59:00,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2021-12-06 21:59:00,179 INFO L87 Difference]: Start difference. First operand 199 states and 279 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-12-06 21:59:00,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:59:00,237 INFO L93 Difference]: Finished difference Result 205 states and 284 transitions. [2021-12-06 21:59:00,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-12-06 21:59:00,238 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 70 [2021-12-06 21:59:00,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:59:00,239 INFO L225 Difference]: With dead ends: 205 [2021-12-06 21:59:00,240 INFO L226 Difference]: Without dead ends: 203 [2021-12-06 21:59:00,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-12-06 21:59:00,241 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 13 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:59:00,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 129 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:59:00,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2021-12-06 21:59:00,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2021-12-06 21:59:00,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 117 states have (on average 1.170940170940171) internal successors, (137), 124 states have internal predecessors, (137), 73 states have call successors, (73), 12 states have call predecessors, (73), 12 states have return successors, (72), 66 states have call predecessors, (72), 72 states have call successors, (72) [2021-12-06 21:59:00,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 282 transitions. [2021-12-06 21:59:00,278 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 282 transitions. Word has length 70 [2021-12-06 21:59:00,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:59:00,278 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 282 transitions. [2021-12-06 21:59:00,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-12-06 21:59:00,278 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 282 transitions. [2021-12-06 21:59:00,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-12-06 21:59:00,280 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:59:00,280 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:59:00,299 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-12-06 21:59:00,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-12-06 21:59:00,481 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:59:00,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:59:00,482 INFO L85 PathProgramCache]: Analyzing trace with hash -1439093215, now seen corresponding path program 1 times [2021-12-06 21:59:00,482 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:59:00,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918940243] [2021-12-06 21:59:00,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:00,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:59:00,510 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:59:00,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [171675011] [2021-12-06 21:59:00,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:00,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:59:00,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:59:00,514 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:59:00,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-12-06 21:59:00,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:00,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 44 conjunts are in the unsatisfiable core [2021-12-06 21:59:00,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:59:00,819 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-12-06 21:59:00,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:59:00,921 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 25 proven. 9 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-12-06 21:59:00,921 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:59:00,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918940243] [2021-12-06 21:59:00,921 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:59:00,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171675011] [2021-12-06 21:59:00,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171675011] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:59:00,921 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:59:00,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2021-12-06 21:59:00,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573841923] [2021-12-06 21:59:00,922 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 21:59:00,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-12-06 21:59:00,922 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:00,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-12-06 21:59:00,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-12-06 21:59:00,923 INFO L87 Difference]: Start difference. First operand 203 states and 282 transitions. Second operand has 13 states, 13 states have (on average 4.230769230769231) internal successors, (55), 12 states have internal predecessors, (55), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-12-06 21:59:01,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:59:01,287 INFO L93 Difference]: Finished difference Result 250 states and 347 transitions. [2021-12-06 21:59:01,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-12-06 21:59:01,288 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.230769230769231) internal successors, (55), 12 states have internal predecessors, (55), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 68 [2021-12-06 21:59:01,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:59:01,290 INFO L225 Difference]: With dead ends: 250 [2021-12-06 21:59:01,290 INFO L226 Difference]: Without dead ends: 248 [2021-12-06 21:59:01,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2021-12-06 21:59:01,290 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 59 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-06 21:59:01,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 348 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-06 21:59:01,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2021-12-06 21:59:01,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 211. [2021-12-06 21:59:01,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 123 states have (on average 1.1626016260162602) internal successors, (143), 130 states have internal predecessors, (143), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 66 states have call predecessors, (72), 72 states have call successors, (72) [2021-12-06 21:59:01,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 288 transitions. [2021-12-06 21:59:01,322 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 288 transitions. Word has length 68 [2021-12-06 21:59:01,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:59:01,322 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 288 transitions. [2021-12-06 21:59:01,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.230769230769231) internal successors, (55), 12 states have internal predecessors, (55), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-12-06 21:59:01,323 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 288 transitions. [2021-12-06 21:59:01,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-06 21:59:01,323 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:59:01,323 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:59:01,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2021-12-06 21:59:01,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:59:01,525 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:59:01,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:59:01,526 INFO L85 PathProgramCache]: Analyzing trace with hash 798002477, now seen corresponding path program 2 times [2021-12-06 21:59:01,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:59:01,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370033808] [2021-12-06 21:59:01,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:01,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:59:01,553 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:59:01,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1296224044] [2021-12-06 21:59:01,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 21:59:01,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:59:01,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:59:01,557 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:59:01,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-12-06 21:59:01,605 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 21:59:01,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:59:01,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 4 conjunts are in the unsatisfiable core [2021-12-06 21:59:01,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:59:01,659 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-12-06 21:59:01,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-06 21:59:01,659 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:59:01,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370033808] [2021-12-06 21:59:01,659 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:59:01,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296224044] [2021-12-06 21:59:01,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296224044] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-06 21:59:01,659 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-06 21:59:01,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-06 21:59:01,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759214225] [2021-12-06 21:59:01,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-06 21:59:01,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-06 21:59:01,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:01,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-06 21:59:01,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-12-06 21:59:01,660 INFO L87 Difference]: Start difference. First operand 211 states and 288 transitions. Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-12-06 21:59:01,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:59:01,719 INFO L93 Difference]: Finished difference Result 363 states and 496 transitions. [2021-12-06 21:59:01,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-06 21:59:01,720 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 73 [2021-12-06 21:59:01,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:59:01,721 INFO L225 Difference]: With dead ends: 363 [2021-12-06 21:59:01,721 INFO L226 Difference]: Without dead ends: 231 [2021-12-06 21:59:01,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-12-06 21:59:01,722 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 3 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-06 21:59:01,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 132 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-06 21:59:01,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-12-06 21:59:01,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 220. [2021-12-06 21:59:01,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 132 states have (on average 1.1818181818181819) internal successors, (156), 133 states have internal predecessors, (156), 73 states have call successors, (73), 14 states have call predecessors, (73), 14 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2021-12-06 21:59:01,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 301 transitions. [2021-12-06 21:59:01,753 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 301 transitions. Word has length 73 [2021-12-06 21:59:01,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:59:01,753 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 301 transitions. [2021-12-06 21:59:01,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-12-06 21:59:01,753 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 301 transitions. [2021-12-06 21:59:01,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-12-06 21:59:01,754 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:59:01,754 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:59:01,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-12-06 21:59:01,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-12-06 21:59:01,955 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:59:01,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:59:01,955 INFO L85 PathProgramCache]: Analyzing trace with hash -1622368081, now seen corresponding path program 3 times [2021-12-06 21:59:01,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:59:01,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513799323] [2021-12-06 21:59:01,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:01,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:59:01,962 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:59:01,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1373659751] [2021-12-06 21:59:01,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 21:59:01,962 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:59:01,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:59:01,963 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:59:01,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-12-06 21:59:02,000 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-12-06 21:59:02,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 21:59:02,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 64 conjunts are in the unsatisfiable core [2021-12-06 21:59:02,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:59:02,370 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 21 proven. 23 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-12-06 21:59:02,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:59:05,849 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-12-06 21:59:05,849 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:59:05,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513799323] [2021-12-06 21:59:05,849 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:59:05,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373659751] [2021-12-06 21:59:05,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373659751] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:59:05,850 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:59:05,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-12-06 21:59:05,850 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366754669] [2021-12-06 21:59:05,850 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 21:59:05,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-12-06 21:59:05,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:05,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-12-06 21:59:05,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=393, Unknown=1, NotChecked=0, Total=462 [2021-12-06 21:59:05,851 INFO L87 Difference]: Start difference. First operand 220 states and 301 transitions. Second operand has 22 states, 20 states have (on average 2.9) internal successors, (58), 19 states have internal predecessors, (58), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-12-06 21:59:10,286 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:11,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 21:59:11,403 INFO L93 Difference]: Finished difference Result 278 states and 380 transitions. [2021-12-06 21:59:11,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-06 21:59:11,404 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 2.9) internal successors, (58), 19 states have internal predecessors, (58), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 73 [2021-12-06 21:59:11,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 21:59:11,406 INFO L225 Difference]: With dead ends: 278 [2021-12-06 21:59:11,406 INFO L226 Difference]: Without dead ends: 274 [2021-12-06 21:59:11,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=305, Invalid=1334, Unknown=1, NotChecked=0, Total=1640 [2021-12-06 21:59:11,407 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 131 mSDsluCounter, 469 mSDsCounter, 0 mSdLazyCounter, 613 mSolverCounterSat, 216 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 510 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 613 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-12-06 21:59:11,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 510 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 613 Invalid, 1 Unknown, 0 Unchecked, 4.5s Time] [2021-12-06 21:59:11,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-12-06 21:59:11,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 222. [2021-12-06 21:59:11,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 134 states have (on average 1.171641791044776) internal successors, (157), 134 states have internal predecessors, (157), 73 states have call successors, (73), 15 states have call predecessors, (73), 14 states have return successors, (72), 72 states have call predecessors, (72), 72 states have call successors, (72) [2021-12-06 21:59:11,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 302 transitions. [2021-12-06 21:59:11,448 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 302 transitions. Word has length 73 [2021-12-06 21:59:11,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 21:59:11,448 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 302 transitions. [2021-12-06 21:59:11,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 2.9) internal successors, (58), 19 states have internal predecessors, (58), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-12-06 21:59:11,449 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 302 transitions. [2021-12-06 21:59:11,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-12-06 21:59:11,449 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 21:59:11,450 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 21:59:11,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-12-06 21:59:11,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-12-06 21:59:11,651 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 21:59:11,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 21:59:11,652 INFO L85 PathProgramCache]: Analyzing trace with hash 160585404, now seen corresponding path program 1 times [2021-12-06 21:59:11,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 21:59:11,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108323776] [2021-12-06 21:59:11,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:11,653 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 21:59:11,679 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 21:59:11,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [998743682] [2021-12-06 21:59:11,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 21:59:11,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 21:59:11,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 21:59:11,682 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 21:59:11,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-12-06 21:59:11,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 21:59:11,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 85 conjunts are in the unsatisfiable core [2021-12-06 21:59:11,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 21:59:12,285 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 51 proven. 32 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-12-06 21:59:12,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 21:59:15,464 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 61 proven. 17 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2021-12-06 21:59:15,465 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 21:59:15,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108323776] [2021-12-06 21:59:15,465 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 21:59:15,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998743682] [2021-12-06 21:59:15,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998743682] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 21:59:15,465 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 21:59:15,465 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 27 [2021-12-06 21:59:15,465 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662071919] [2021-12-06 21:59:15,465 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 21:59:15,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-06 21:59:15,466 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 21:59:15,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-06 21:59:15,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2021-12-06 21:59:15,466 INFO L87 Difference]: Start difference. First operand 222 states and 302 transitions. Second operand has 27 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-12-06 21:59:24,294 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:27,104 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:32,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:35,451 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:40,577 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:42,139 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:44,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:52,338 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:54,833 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:57,795 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 21:59:59,861 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:00:03,907 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:00:12,643 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:00:14,729 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:00:16,928 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:00:18,336 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.12s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:00:20,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:20,595 INFO L93 Difference]: Finished difference Result 395 states and 546 transitions. [2021-12-06 22:00:20,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-12-06 22:00:20,595 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) Word has length 87 [2021-12-06 22:00:20,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:20,598 INFO L225 Difference]: With dead ends: 395 [2021-12-06 22:00:20,598 INFO L226 Difference]: Without dead ends: 389 [2021-12-06 22:00:20,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 159 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1780 ImplicationChecksByTransitivity, 22.5s TimeCoverageRelationStatistics Valid=1056, Invalid=5264, Unknown=0, NotChecked=0, Total=6320 [2021-12-06 22:00:20,600 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 198 mSDsluCounter, 817 mSDsCounter, 0 mSdLazyCounter, 1854 mSolverCounterSat, 481 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 879 SdHoareTripleChecker+Invalid, 2347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 481 IncrementalHoareTripleChecker+Valid, 1854 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 44.3s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:20,600 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 879 Invalid, 2347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [481 Valid, 1854 Invalid, 12 Unknown, 0 Unchecked, 44.3s Time] [2021-12-06 22:00:20,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-12-06 22:00:20,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 320. [2021-12-06 22:00:20,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 186 states have (on average 1.1935483870967742) internal successors, (222), 186 states have internal predecessors, (222), 113 states have call successors, (113), 21 states have call predecessors, (113), 20 states have return successors, (112), 112 states have call predecessors, (112), 112 states have call successors, (112) [2021-12-06 22:00:20,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 447 transitions. [2021-12-06 22:00:20,682 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 447 transitions. Word has length 87 [2021-12-06 22:00:20,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:20,682 INFO L470 AbstractCegarLoop]: Abstraction has 320 states and 447 transitions. [2021-12-06 22:00:20,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 2.5454545454545454) internal successors, (56), 23 states have internal predecessors, (56), 11 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 8 states have call predecessors, (20), 9 states have call successors, (20) [2021-12-06 22:00:20,683 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 447 transitions. [2021-12-06 22:00:20,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-12-06 22:00:20,684 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:20,684 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:00:20,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-12-06 22:00:20,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-12-06 22:00:20,885 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:20,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:20,887 INFO L85 PathProgramCache]: Analyzing trace with hash -1330396859, now seen corresponding path program 2 times [2021-12-06 22:00:20,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:20,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773015951] [2021-12-06 22:00:20,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:20,888 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:20,915 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:00:20,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1187700719] [2021-12-06 22:00:20,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 22:00:20,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:20,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:20,918 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:20,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-12-06 22:00:20,994 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 22:00:20,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:00:20,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 10 conjunts are in the unsatisfiable core [2021-12-06 22:00:20,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:21,089 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 38 proven. 16 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-12-06 22:00:21,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:21,173 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 38 proven. 16 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-12-06 22:00:21,173 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:21,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773015951] [2021-12-06 22:00:21,174 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:00:21,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187700719] [2021-12-06 22:00:21,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187700719] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:00:21,174 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 22:00:21,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-12-06 22:00:21,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596127788] [2021-12-06 22:00:21,174 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 22:00:21,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-06 22:00:21,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:21,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-06 22:00:21,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-12-06 22:00:21,175 INFO L87 Difference]: Start difference. First operand 320 states and 447 transitions. Second operand has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-12-06 22:00:21,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:00:21,720 INFO L93 Difference]: Finished difference Result 422 states and 591 transitions. [2021-12-06 22:00:21,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-12-06 22:00:21,721 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 95 [2021-12-06 22:00:21,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:00:21,723 INFO L225 Difference]: With dead ends: 422 [2021-12-06 22:00:21,723 INFO L226 Difference]: Without dead ends: 417 [2021-12-06 22:00:21,723 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=189, Invalid=623, Unknown=0, NotChecked=0, Total=812 [2021-12-06 22:00:21,724 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 65 mSDsluCounter, 370 mSDsCounter, 0 mSdLazyCounter, 361 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 361 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-12-06 22:00:21,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 457 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 361 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-12-06 22:00:21,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2021-12-06 22:00:21,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 306. [2021-12-06 22:00:21,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 176 states have (on average 1.1988636363636365) internal successors, (211), 176 states have internal predecessors, (211), 109 states have call successors, (109), 21 states have call predecessors, (109), 20 states have return successors, (108), 108 states have call predecessors, (108), 108 states have call successors, (108) [2021-12-06 22:00:21,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 428 transitions. [2021-12-06 22:00:21,803 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 428 transitions. Word has length 95 [2021-12-06 22:00:21,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:00:21,803 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 428 transitions. [2021-12-06 22:00:21,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-12-06 22:00:21,803 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 428 transitions. [2021-12-06 22:00:21,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-12-06 22:00:21,805 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:00:21,805 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:00:21,824 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-12-06 22:00:22,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-12-06 22:00:22,005 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:00:22,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:00:22,006 INFO L85 PathProgramCache]: Analyzing trace with hash 1192369783, now seen corresponding path program 2 times [2021-12-06 22:00:22,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:00:22,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703178252] [2021-12-06 22:00:22,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:00:22,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:00:22,013 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:00:22,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [37540628] [2021-12-06 22:00:22,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 22:00:22,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:00:22,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:00:22,014 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:00:22,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-12-06 22:00:22,063 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 22:00:22,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:00:22,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 104 conjunts are in the unsatisfiable core [2021-12-06 22:00:22,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:00:24,050 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 118 proven. 123 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-12-06 22:00:24,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:00:37,384 INFO L134 CoverageAnalysis]: Checked inductivity of 592 backedges. 126 proven. 104 refuted. 0 times theorem prover too weak. 362 trivial. 0 not checked. [2021-12-06 22:00:37,385 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:00:37,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703178252] [2021-12-06 22:00:37,385 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:00:37,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37540628] [2021-12-06 22:00:37,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37540628] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:00:37,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 22:00:37,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 20] total 39 [2021-12-06 22:00:37,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144913558] [2021-12-06 22:00:37,385 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 22:00:37,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-12-06 22:00:37,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:00:37,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-12-06 22:00:37,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1235, Unknown=0, NotChecked=0, Total=1482 [2021-12-06 22:00:37,387 INFO L87 Difference]: Start difference. First operand 306 states and 428 transitions. Second operand has 39 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 31 states have internal predecessors, (73), 15 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (39), 14 states have call predecessors, (39), 13 states have call successors, (39) [2021-12-06 22:01:07,390 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:01:15,254 WARN L227 SmtUtils]: Spent 6.08s on a formula simplification. DAG size of input: 115 DAG size of output: 109 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:01:24,234 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:01:45,539 WARN L227 SmtUtils]: Spent 6.76s on a formula simplification. DAG size of input: 108 DAG size of output: 102 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:01:52,887 WARN L227 SmtUtils]: Spent 7.06s on a formula simplification. DAG size of input: 107 DAG size of output: 101 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:02:01,979 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:02:11,991 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:02:14,028 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:02:16,307 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:02:22,021 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:02:35,296 WARN L227 SmtUtils]: Spent 11.36s on a formula simplification. DAG size of input: 119 DAG size of output: 113 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:02:51,780 WARN L227 SmtUtils]: Spent 9.73s on a formula simplification. DAG size of input: 116 DAG size of output: 110 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:03:08,198 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:11,815 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:13,827 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:16,062 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:18,376 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:27,450 WARN L227 SmtUtils]: Spent 5.51s on a formula simplification. DAG size of input: 116 DAG size of output: 110 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:03:34,928 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:37,084 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:03:38,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:03:38,680 INFO L93 Difference]: Finished difference Result 572 states and 810 transitions. [2021-12-06 22:03:38,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-12-06 22:03:38,681 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 31 states have internal predecessors, (73), 15 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (39), 14 states have call predecessors, (39), 13 states have call successors, (39) Word has length 134 [2021-12-06 22:03:38,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:03:38,683 INFO L225 Difference]: With dead ends: 572 [2021-12-06 22:03:38,683 INFO L226 Difference]: Without dead ends: 475 [2021-12-06 22:03:38,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 245 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3419 ImplicationChecksByTransitivity, 129.0s TimeCoverageRelationStatistics Valid=2224, Invalid=9766, Unknown=0, NotChecked=0, Total=11990 [2021-12-06 22:03:38,687 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 271 mSDsluCounter, 860 mSDsCounter, 0 mSdLazyCounter, 2626 mSolverCounterSat, 853 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 907 SdHoareTripleChecker+Invalid, 3490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 853 IncrementalHoareTripleChecker+Valid, 2626 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 59.1s IncrementalHoareTripleChecker+Time [2021-12-06 22:03:38,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 907 Invalid, 3490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [853 Valid, 2626 Invalid, 11 Unknown, 0 Unchecked, 59.1s Time] [2021-12-06 22:03:38,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-12-06 22:03:38,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 354. [2021-12-06 22:03:38,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 354 states, 201 states have (on average 1.2039800995024876) internal successors, (242), 201 states have internal predecessors, (242), 129 states have call successors, (129), 24 states have call predecessors, (129), 23 states have return successors, (128), 128 states have call predecessors, (128), 128 states have call successors, (128) [2021-12-06 22:03:38,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 354 states to 354 states and 499 transitions. [2021-12-06 22:03:38,819 INFO L78 Accepts]: Start accepts. Automaton has 354 states and 499 transitions. Word has length 134 [2021-12-06 22:03:38,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:03:38,819 INFO L470 AbstractCegarLoop]: Abstraction has 354 states and 499 transitions. [2021-12-06 22:03:38,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 31 states have internal predecessors, (73), 15 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (39), 14 states have call predecessors, (39), 13 states have call successors, (39) [2021-12-06 22:03:38,819 INFO L276 IsEmpty]: Start isEmpty. Operand 354 states and 499 transitions. [2021-12-06 22:03:38,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-12-06 22:03:38,821 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:03:38,821 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:03:38,841 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-12-06 22:03:39,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-12-06 22:03:39,022 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:03:39,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:03:39,022 INFO L85 PathProgramCache]: Analyzing trace with hash 54025799, now seen corresponding path program 3 times [2021-12-06 22:03:39,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:03:39,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450693392] [2021-12-06 22:03:39,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:03:39,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:03:39,031 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:03:39,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1480436327] [2021-12-06 22:03:39,031 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 22:03:39,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:03:39,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:03:39,032 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:03:39,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-12-06 22:03:39,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-06 22:03:39,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:03:39,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 95 conjunts are in the unsatisfiable core [2021-12-06 22:03:39,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:03:40,354 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-12-06 22:03:40,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:03:47,223 INFO L134 CoverageAnalysis]: Checked inductivity of 608 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-12-06 22:03:47,224 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:03:47,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450693392] [2021-12-06 22:03:47,224 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:03:47,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1480436327] [2021-12-06 22:03:47,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1480436327] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:03:47,224 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 22:03:47,224 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23] total 40 [2021-12-06 22:03:47,224 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094094194] [2021-12-06 22:03:47,224 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 22:03:47,225 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-12-06 22:03:47,225 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:03:47,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-12-06 22:03:47,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1358, Unknown=0, NotChecked=0, Total=1560 [2021-12-06 22:03:47,226 INFO L87 Difference]: Start difference. First operand 354 states and 499 transitions. Second operand has 40 states, 37 states have (on average 2.189189189189189) internal successors, (81), 36 states have internal predecessors, (81), 13 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (39), 12 states have call predecessors, (39), 11 states have call successors, (39) [2021-12-06 22:04:09,645 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:04:18,095 WARN L227 SmtUtils]: Spent 5.93s on a formula simplification. DAG size of input: 110 DAG size of output: 106 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:04:20,376 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:04:25,775 WARN L227 SmtUtils]: Spent 5.29s on a formula simplification that was a NOOP. DAG size: 90 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:04:36,222 WARN L227 SmtUtils]: Spent 7.40s on a formula simplification that was a NOOP. DAG size: 115 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:04:41,501 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:04:42,950 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:05:10,609 WARN L227 SmtUtils]: Spent 8.56s on a formula simplification. DAG size of input: 119 DAG size of output: 115 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:05:17,439 WARN L227 SmtUtils]: Spent 5.92s on a formula simplification. DAG size of input: 109 DAG size of output: 105 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:05:19,453 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:05:21,087 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:05:26,662 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:05:28,468 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:05:39,919 WARN L227 SmtUtils]: Spent 11.23s on a formula simplification that was a NOOP. DAG size: 124 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:05:48,948 WARN L227 SmtUtils]: Spent 6.93s on a formula simplification that was a NOOP. DAG size: 109 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:06:03,337 WARN L227 SmtUtils]: Spent 7.02s on a formula simplification that was a NOOP. DAG size: 96 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:06:29,313 WARN L227 SmtUtils]: Spent 5.29s on a formula simplification. DAG size of input: 118 DAG size of output: 114 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:06:46,840 WARN L227 SmtUtils]: Spent 13.55s on a formula simplification that was a NOOP. DAG size: 129 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:06:54,454 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:07:12,689 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:08:12,921 WARN L227 SmtUtils]: Spent 27.66s on a formula simplification. DAG size of input: 132 DAG size of output: 131 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:08:21,481 WARN L227 SmtUtils]: Spent 5.56s on a formula simplification that was a NOOP. DAG size: 116 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:08:33,704 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:08:35,723 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:08:37,754 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.30s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:08:58,858 WARN L227 SmtUtils]: Spent 6.26s on a formula simplification. DAG size of input: 110 DAG size of output: 106 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:09:10,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:09:10,885 INFO L93 Difference]: Finished difference Result 845 states and 1257 transitions. [2021-12-06 22:09:10,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-12-06 22:09:10,886 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 37 states have (on average 2.189189189189189) internal successors, (81), 36 states have internal predecessors, (81), 13 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (39), 12 states have call predecessors, (39), 11 states have call successors, (39) Word has length 139 [2021-12-06 22:09:10,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:09:10,890 INFO L225 Difference]: With dead ends: 845 [2021-12-06 22:09:10,890 INFO L226 Difference]: Without dead ends: 839 [2021-12-06 22:09:10,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 7007 ImplicationChecksByTransitivity, 226.6s TimeCoverageRelationStatistics Valid=3193, Invalid=19759, Unknown=0, NotChecked=0, Total=22952 [2021-12-06 22:09:10,897 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 426 mSDsluCounter, 1943 mSDsCounter, 0 mSdLazyCounter, 3568 mSolverCounterSat, 1448 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 101.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 2142 SdHoareTripleChecker+Invalid, 5029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1448 IncrementalHoareTripleChecker+Valid, 3568 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 8 IncrementalHoareTripleChecker+Unchecked, 102.9s IncrementalHoareTripleChecker+Time [2021-12-06 22:09:10,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [430 Valid, 2142 Invalid, 5029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1448 Valid, 3568 Invalid, 5 Unknown, 8 Unchecked, 102.9s Time] [2021-12-06 22:09:10,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2021-12-06 22:09:11,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 562. [2021-12-06 22:09:11,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 562 states, 320 states have (on average 1.225) internal successors, (392), 320 states have internal predecessors, (392), 213 states have call successors, (213), 29 states have call predecessors, (213), 28 states have return successors, (212), 212 states have call predecessors, (212), 212 states have call successors, (212) [2021-12-06 22:09:11,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 562 states to 562 states and 817 transitions. [2021-12-06 22:09:11,188 INFO L78 Accepts]: Start accepts. Automaton has 562 states and 817 transitions. Word has length 139 [2021-12-06 22:09:11,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:09:11,188 INFO L470 AbstractCegarLoop]: Abstraction has 562 states and 817 transitions. [2021-12-06 22:09:11,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 37 states have (on average 2.189189189189189) internal successors, (81), 36 states have internal predecessors, (81), 13 states have call successors, (40), 2 states have call predecessors, (40), 2 states have return successors, (39), 12 states have call predecessors, (39), 11 states have call successors, (39) [2021-12-06 22:09:11,189 INFO L276 IsEmpty]: Start isEmpty. Operand 562 states and 817 transitions. [2021-12-06 22:09:11,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-12-06 22:09:11,191 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:09:11,191 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:09:11,211 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-12-06 22:09:11,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:11,391 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:09:11,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:09:11,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1917326542, now seen corresponding path program 4 times [2021-12-06 22:09:11,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:09:11,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434067141] [2021-12-06 22:09:11,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:09:11,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:09:11,399 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:09:11,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1690709528] [2021-12-06 22:09:11,399 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-06 22:09:11,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:11,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:09:11,400 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:09:11,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-12-06 22:09:11,458 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-06 22:09:11,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:09:11,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 107 conjunts are in the unsatisfiable core [2021-12-06 22:09:11,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:09:13,176 INFO L134 CoverageAnalysis]: Checked inductivity of 620 backedges. 133 proven. 127 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-12-06 22:09:13,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:09:15,742 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:09:15,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434067141] [2021-12-06 22:09:15,742 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:09:15,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690709528] [2021-12-06 22:09:15,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690709528] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:09:15,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 22:09:15,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-12-06 22:09:15,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519410840] [2021-12-06 22:09:15,743 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 22:09:15,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-12-06 22:09:15,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:09:15,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-12-06 22:09:15,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=831, Unknown=0, NotChecked=0, Total=930 [2021-12-06 22:09:15,744 INFO L87 Difference]: Start difference. First operand 562 states and 817 transitions. Second operand has 24 states, 22 states have (on average 2.272727272727273) internal successors, (50), 22 states have internal predecessors, (50), 9 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2021-12-06 22:09:18,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:09:18,951 INFO L93 Difference]: Finished difference Result 689 states and 992 transitions. [2021-12-06 22:09:18,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-06 22:09:18,952 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.272727272727273) internal successors, (50), 22 states have internal predecessors, (50), 9 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) Word has length 142 [2021-12-06 22:09:18,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:09:18,955 INFO L225 Difference]: With dead ends: 689 [2021-12-06 22:09:18,955 INFO L226 Difference]: Without dead ends: 684 [2021-12-06 22:09:18,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=169, Invalid=1471, Unknown=0, NotChecked=0, Total=1640 [2021-12-06 22:09:18,956 INFO L933 BasicCegarLoop]: 64 mSDtfsCounter, 88 mSDsluCounter, 883 mSDsCounter, 0 mSdLazyCounter, 1571 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 947 SdHoareTripleChecker+Invalid, 1665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 1571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-12-06 22:09:18,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 947 Invalid, 1665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 1571 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-12-06 22:09:18,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 684 states. [2021-12-06 22:09:19,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 684 to 649. [2021-12-06 22:09:19,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 649 states, 363 states have (on average 1.2314049586776858) internal successors, (447), 363 states have internal predecessors, (447), 253 states have call successors, (253), 33 states have call predecessors, (253), 32 states have return successors, (252), 252 states have call predecessors, (252), 252 states have call successors, (252) [2021-12-06 22:09:19,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 649 states to 649 states and 952 transitions. [2021-12-06 22:09:19,304 INFO L78 Accepts]: Start accepts. Automaton has 649 states and 952 transitions. Word has length 142 [2021-12-06 22:09:19,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:09:19,305 INFO L470 AbstractCegarLoop]: Abstraction has 649 states and 952 transitions. [2021-12-06 22:09:19,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.272727272727273) internal successors, (50), 22 states have internal predecessors, (50), 9 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (20), 7 states have call predecessors, (20), 8 states have call successors, (20) [2021-12-06 22:09:19,305 INFO L276 IsEmpty]: Start isEmpty. Operand 649 states and 952 transitions. [2021-12-06 22:09:19,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-12-06 22:09:19,307 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:09:19,307 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:09:19,326 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-12-06 22:09:19,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:19,508 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:09:19,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:09:19,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1557127312, now seen corresponding path program 5 times [2021-12-06 22:09:19,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:09:19,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370982699] [2021-12-06 22:09:19,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:09:19,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:09:19,533 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:09:19,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [95235515] [2021-12-06 22:09:19,533 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-06 22:09:19,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:19,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:09:19,534 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:09:19,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-12-06 22:09:19,596 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-12-06 22:09:19,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:09:19,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-06 22:09:19,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:09:20,067 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 58 proven. 71 refuted. 0 times theorem prover too weak. 775 trivial. 0 not checked. [2021-12-06 22:09:20,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:09:20,777 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 52 proven. 77 refuted. 0 times theorem prover too weak. 775 trivial. 0 not checked. [2021-12-06 22:09:20,777 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:09:20,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370982699] [2021-12-06 22:09:20,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:09:20,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95235515] [2021-12-06 22:09:20,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95235515] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:09:20,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 22:09:20,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2021-12-06 22:09:20,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455099324] [2021-12-06 22:09:20,778 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 22:09:20,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-12-06 22:09:20,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:09:20,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-12-06 22:09:20,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2021-12-06 22:09:20,779 INFO L87 Difference]: Start difference. First operand 649 states and 952 transitions. Second operand has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 27 states have internal predecessors, (70), 14 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 12 states have call predecessors, (48), 13 states have call successors, (48) [2021-12-06 22:09:27,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:09:27,446 INFO L93 Difference]: Finished difference Result 981 states and 1469 transitions. [2021-12-06 22:09:27,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-12-06 22:09:27,448 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 27 states have internal predecessors, (70), 14 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 12 states have call predecessors, (48), 13 states have call successors, (48) Word has length 156 [2021-12-06 22:09:27,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:09:27,452 INFO L225 Difference]: With dead ends: 981 [2021-12-06 22:09:27,452 INFO L226 Difference]: Without dead ends: 832 [2021-12-06 22:09:27,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=973, Invalid=5833, Unknown=0, NotChecked=0, Total=6806 [2021-12-06 22:09:27,455 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 251 mSDsluCounter, 1136 mSDsCounter, 0 mSdLazyCounter, 1300 mSolverCounterSat, 719 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 1307 SdHoareTripleChecker+Invalid, 2019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 719 IncrementalHoareTripleChecker+Valid, 1300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-12-06 22:09:27,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 1307 Invalid, 2019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [719 Valid, 1300 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-12-06 22:09:27,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2021-12-06 22:09:27,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 755. [2021-12-06 22:09:27,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 417 states have (on average 1.2326139088729018) internal successors, (514), 417 states have internal predecessors, (514), 305 states have call successors, (305), 33 states have call predecessors, (305), 32 states have return successors, (304), 304 states have call predecessors, (304), 304 states have call successors, (304) [2021-12-06 22:09:27,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 1123 transitions. [2021-12-06 22:09:27,892 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 1123 transitions. Word has length 156 [2021-12-06 22:09:27,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:09:27,892 INFO L470 AbstractCegarLoop]: Abstraction has 755 states and 1123 transitions. [2021-12-06 22:09:27,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 27 states have internal predecessors, (70), 14 states have call successors, (48), 2 states have call predecessors, (48), 2 states have return successors, (48), 12 states have call predecessors, (48), 13 states have call successors, (48) [2021-12-06 22:09:27,893 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 1123 transitions. [2021-12-06 22:09:27,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-12-06 22:09:27,895 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:09:27,895 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:09:27,915 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-12-06 22:09:28,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:28,096 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:09:28,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:09:28,096 INFO L85 PathProgramCache]: Analyzing trace with hash 314529541, now seen corresponding path program 6 times [2021-12-06 22:09:28,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:09:28,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147265559] [2021-12-06 22:09:28,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:09:28,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:09:28,103 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:09:28,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2147164045] [2021-12-06 22:09:28,103 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-06 22:09:28,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:28,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:09:28,104 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:09:28,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-12-06 22:09:28,268 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-12-06 22:09:28,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:09:28,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 30 conjunts are in the unsatisfiable core [2021-12-06 22:09:28,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:09:28,761 INFO L134 CoverageAnalysis]: Checked inductivity of 914 backedges. 329 proven. 58 refuted. 0 times theorem prover too weak. 527 trivial. 0 not checked. [2021-12-06 22:09:28,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:09:30,427 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:09:30,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147265559] [2021-12-06 22:09:30,427 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:09:30,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2147164045] [2021-12-06 22:09:30,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2147164045] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:09:30,428 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 22:09:30,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-12-06 22:09:30,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222985747] [2021-12-06 22:09:30,428 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 22:09:30,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-06 22:09:30,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:09:30,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-06 22:09:30,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=882, Unknown=0, NotChecked=0, Total=992 [2021-12-06 22:09:30,429 INFO L87 Difference]: Start difference. First operand 755 states and 1123 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:09:31,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:09:31,973 INFO L93 Difference]: Finished difference Result 899 states and 1330 transitions. [2021-12-06 22:09:31,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-06 22:09:31,974 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) Word has length 159 [2021-12-06 22:09:31,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:09:31,978 INFO L225 Difference]: With dead ends: 899 [2021-12-06 22:09:31,978 INFO L226 Difference]: Without dead ends: 738 [2021-12-06 22:09:31,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 265 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=339, Invalid=2013, Unknown=0, NotChecked=0, Total=2352 [2021-12-06 22:09:31,979 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 81 mSDsluCounter, 709 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-06 22:09:31,979 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 791 Invalid, 711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-06 22:09:31,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 738 states. [2021-12-06 22:09:32,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 738 to 719. [2021-12-06 22:09:32,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 719 states, 397 states have (on average 1.2267002518891688) internal successors, (487), 397 states have internal predecessors, (487), 289 states have call successors, (289), 33 states have call predecessors, (289), 32 states have return successors, (288), 288 states have call predecessors, (288), 288 states have call successors, (288) [2021-12-06 22:09:32,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 719 states to 719 states and 1064 transitions. [2021-12-06 22:09:32,402 INFO L78 Accepts]: Start accepts. Automaton has 719 states and 1064 transitions. Word has length 159 [2021-12-06 22:09:32,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:09:32,402 INFO L470 AbstractCegarLoop]: Abstraction has 719 states and 1064 transitions. [2021-12-06 22:09:32,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:09:32,402 INFO L276 IsEmpty]: Start isEmpty. Operand 719 states and 1064 transitions. [2021-12-06 22:09:32,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-12-06 22:09:32,406 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:09:32,407 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:09:32,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2021-12-06 22:09:32,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:32,608 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:09:32,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:09:32,609 INFO L85 PathProgramCache]: Analyzing trace with hash -310353223, now seen corresponding path program 7 times [2021-12-06 22:09:32,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:09:32,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132627667] [2021-12-06 22:09:32,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:09:32,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:09:32,630 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:09:32,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [851437532] [2021-12-06 22:09:32,630 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-12-06 22:09:32,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:32,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:09:32,632 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:09:32,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-12-06 22:09:32,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-06 22:09:32,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 21 conjunts are in the unsatisfiable core [2021-12-06 22:09:32,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:09:33,177 INFO L134 CoverageAnalysis]: Checked inductivity of 932 backedges. 344 proven. 61 refuted. 0 times theorem prover too weak. 527 trivial. 0 not checked. [2021-12-06 22:09:33,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:09:34,762 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:09:34,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132627667] [2021-12-06 22:09:34,762 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:09:34,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851437532] [2021-12-06 22:09:34,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851437532] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:09:34,762 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 22:09:34,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-12-06 22:09:34,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831916492] [2021-12-06 22:09:34,763 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 22:09:34,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-12-06 22:09:34,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:09:34,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-12-06 22:09:34,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2021-12-06 22:09:34,763 INFO L87 Difference]: Start difference. First operand 719 states and 1064 transitions. Second operand has 18 states, 18 states have (on average 3.0) internal successors, (54), 18 states have internal predecessors, (54), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:09:36,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:09:36,736 INFO L93 Difference]: Finished difference Result 941 states and 1389 transitions. [2021-12-06 22:09:36,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-06 22:09:36,737 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 18 states have internal predecessors, (54), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) Word has length 164 [2021-12-06 22:09:36,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:09:36,741 INFO L225 Difference]: With dead ends: 941 [2021-12-06 22:09:36,741 INFO L226 Difference]: Without dead ends: 839 [2021-12-06 22:09:36,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=520, Invalid=2450, Unknown=0, NotChecked=0, Total=2970 [2021-12-06 22:09:36,742 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 109 mSDsluCounter, 659 mSDsCounter, 0 mSdLazyCounter, 668 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-06 22:09:36,742 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 756 Invalid, 898 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 668 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-06 22:09:36,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 839 states. [2021-12-06 22:09:37,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 839 to 816. [2021-12-06 22:09:37,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 816 states, 450 states have (on average 1.228888888888889) internal successors, (553), 450 states have internal predecessors, (553), 333 states have call successors, (333), 33 states have call predecessors, (333), 32 states have return successors, (332), 332 states have call predecessors, (332), 332 states have call successors, (332) [2021-12-06 22:09:37,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 816 states to 816 states and 1218 transitions. [2021-12-06 22:09:37,210 INFO L78 Accepts]: Start accepts. Automaton has 816 states and 1218 transitions. Word has length 164 [2021-12-06 22:09:37,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:09:37,210 INFO L470 AbstractCegarLoop]: Abstraction has 816 states and 1218 transitions. [2021-12-06 22:09:37,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.0) internal successors, (54), 18 states have internal predecessors, (54), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 6 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:09:37,210 INFO L276 IsEmpty]: Start isEmpty. Operand 816 states and 1218 transitions. [2021-12-06 22:09:37,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-12-06 22:09:37,213 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:09:37,213 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:09:37,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-12-06 22:09:37,414 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-12-06 22:09:37,414 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:09:37,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:09:37,415 INFO L85 PathProgramCache]: Analyzing trace with hash -207117020, now seen corresponding path program 8 times [2021-12-06 22:09:37,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:09:37,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138682299] [2021-12-06 22:09:37,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:09:37,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:09:37,441 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:09:37,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [781261607] [2021-12-06 22:09:37,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-12-06 22:09:37,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:37,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:09:37,445 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:09:37,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-12-06 22:09:37,509 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-12-06 22:09:37,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:09:37,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 23 conjunts are in the unsatisfiable core [2021-12-06 22:09:37,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:09:38,116 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 368 proven. 77 refuted. 0 times theorem prover too weak. 527 trivial. 0 not checked. [2021-12-06 22:09:38,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:09:46,955 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:09:46,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138682299] [2021-12-06 22:09:46,956 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:09:46,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781261607] [2021-12-06 22:09:46,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781261607] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:09:46,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 22:09:46,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-12-06 22:09:46,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346153038] [2021-12-06 22:09:46,956 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 22:09:46,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-12-06 22:09:46,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:09:46,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-12-06 22:09:46,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1190, Unknown=2, NotChecked=0, Total=1332 [2021-12-06 22:09:46,957 INFO L87 Difference]: Start difference. First operand 816 states and 1218 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:09:48,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:09:48,796 INFO L93 Difference]: Finished difference Result 1259 states and 1882 transitions. [2021-12-06 22:09:48,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-12-06 22:09:48,797 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 172 [2021-12-06 22:09:48,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:09:48,802 INFO L225 Difference]: With dead ends: 1259 [2021-12-06 22:09:48,802 INFO L226 Difference]: Without dead ends: 1128 [2021-12-06 22:09:48,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 284 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=556, Invalid=2522, Unknown=2, NotChecked=0, Total=3080 [2021-12-06 22:09:48,804 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 106 mSDsluCounter, 430 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 232 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 232 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-12-06 22:09:48,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 520 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [232 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-12-06 22:09:48,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1128 states. [2021-12-06 22:09:49,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1128 to 854. [2021-12-06 22:09:49,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 854 states, 468 states have (on average 1.2307692307692308) internal successors, (576), 468 states have internal predecessors, (576), 353 states have call successors, (353), 33 states have call predecessors, (353), 32 states have return successors, (352), 352 states have call predecessors, (352), 352 states have call successors, (352) [2021-12-06 22:09:49,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 854 states to 854 states and 1281 transitions. [2021-12-06 22:09:49,319 INFO L78 Accepts]: Start accepts. Automaton has 854 states and 1281 transitions. Word has length 172 [2021-12-06 22:09:49,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:09:49,319 INFO L470 AbstractCegarLoop]: Abstraction has 854 states and 1281 transitions. [2021-12-06 22:09:49,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 19 states have internal predecessors, (62), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:09:49,320 INFO L276 IsEmpty]: Start isEmpty. Operand 854 states and 1281 transitions. [2021-12-06 22:09:49,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-12-06 22:09:49,322 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:09:49,322 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:09:49,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-12-06 22:09:49,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-12-06 22:09:49,524 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:09:49,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:09:49,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1594478596, now seen corresponding path program 9 times [2021-12-06 22:09:49,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:09:49,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533706155] [2021-12-06 22:09:49,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:09:49,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:09:49,551 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:09:49,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1683685689] [2021-12-06 22:09:49,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-12-06 22:09:49,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:09:49,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:09:49,554 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:09:49,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-12-06 22:09:49,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-12-06 22:09:49,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:09:49,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 89 conjunts are in the unsatisfiable core [2021-12-06 22:09:49,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:10:07,238 WARN L227 SmtUtils]: Spent 9.57s on a formula simplification that was a NOOP. DAG size: 71 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:10:32,090 WARN L227 SmtUtils]: Spent 5.05s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:10:35,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 145 proven. 149 refuted. 0 times theorem prover too weak. 1002 trivial. 0 not checked. [2021-12-06 22:10:35,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:11:02,152 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:11:02,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533706155] [2021-12-06 22:11:02,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:11:02,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683685689] [2021-12-06 22:11:02,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683685689] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:11:02,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 22:11:02,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-12-06 22:11:02,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758303838] [2021-12-06 22:11:02,152 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 22:11:02,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-12-06 22:11:02,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:11:02,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-12-06 22:11:02,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=738, Unknown=10, NotChecked=0, Total=870 [2021-12-06 22:11:02,153 INFO L87 Difference]: Start difference. First operand 854 states and 1281 transitions. Second operand has 21 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 6 states have call successors, (24) [2021-12-06 22:11:21,475 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:23,718 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:26,869 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:29,343 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:30,870 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:33,435 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:35,441 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:37,446 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:40,265 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:43,121 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:45,142 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:49,844 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:51,703 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.22s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:11:55,520 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2021-12-06 22:12:21,757 WARN L227 SmtUtils]: Spent 16.47s on a formula simplification. DAG size of input: 81 DAG size of output: 72 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-12-06 22:12:22,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:12:22,207 INFO L93 Difference]: Finished difference Result 1090 states and 1627 transitions. [2021-12-06 22:12:22,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-12-06 22:12:22,209 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 6 states have call successors, (24) Word has length 181 [2021-12-06 22:12:22,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:12:22,215 INFO L225 Difference]: With dead ends: 1090 [2021-12-06 22:12:22,215 INFO L226 Difference]: Without dead ends: 1085 [2021-12-06 22:12:22,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 210 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 87.9s TimeCoverageRelationStatistics Valid=264, Invalid=1614, Unknown=14, NotChecked=0, Total=1892 [2021-12-06 22:12:22,216 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 89 mSDsluCounter, 810 mSDsCounter, 0 mSdLazyCounter, 1424 mSolverCounterSat, 121 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 40.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 876 SdHoareTripleChecker+Invalid, 1555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 1424 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 40.5s IncrementalHoareTripleChecker+Time [2021-12-06 22:12:22,216 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 876 Invalid, 1555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 1424 Invalid, 10 Unknown, 0 Unchecked, 40.5s Time] [2021-12-06 22:12:22,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1085 states. [2021-12-06 22:12:22,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1085 to 1044. [2021-12-06 22:12:22,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1044 states, 564 states have (on average 1.2411347517730495) internal successors, (700), 564 states have internal predecessors, (700), 441 states have call successors, (441), 39 states have call predecessors, (441), 38 states have return successors, (440), 440 states have call predecessors, (440), 440 states have call successors, (440) [2021-12-06 22:12:22,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1044 states to 1044 states and 1581 transitions. [2021-12-06 22:12:22,869 INFO L78 Accepts]: Start accepts. Automaton has 1044 states and 1581 transitions. Word has length 181 [2021-12-06 22:12:22,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:12:22,870 INFO L470 AbstractCegarLoop]: Abstraction has 1044 states and 1581 transitions. [2021-12-06 22:12:22,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.4) internal successors, (48), 20 states have internal predecessors, (48), 7 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 6 states have call successors, (24) [2021-12-06 22:12:22,870 INFO L276 IsEmpty]: Start isEmpty. Operand 1044 states and 1581 transitions. [2021-12-06 22:12:22,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-12-06 22:12:22,874 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:12:22,874 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:12:22,894 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-12-06 22:12:23,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-12-06 22:12:23,075 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:12:23,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:12:23,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1365573721, now seen corresponding path program 10 times [2021-12-06 22:12:23,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:12:23,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933023967] [2021-12-06 22:12:23,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:12:23,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:12:23,081 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:12:23,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [864160698] [2021-12-06 22:12:23,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-12-06 22:12:23,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:12:23,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:12:23,082 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:12:23,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-12-06 22:12:23,124 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-12-06 22:12:23,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:12:23,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 20 conjunts are in the unsatisfiable core [2021-12-06 22:12:23,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:12:23,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1309 backedges. 410 proven. 92 refuted. 0 times theorem prover too weak. 807 trivial. 0 not checked. [2021-12-06 22:12:23,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:12:25,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1309 backedges. 110 proven. 80 refuted. 0 times theorem prover too weak. 1119 trivial. 0 not checked. [2021-12-06 22:12:25,005 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:12:25,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933023967] [2021-12-06 22:12:25,005 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:12:25,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864160698] [2021-12-06 22:12:25,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864160698] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-06 22:12:25,005 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-12-06 22:12:25,005 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 33 [2021-12-06 22:12:25,005 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194573528] [2021-12-06 22:12:25,005 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-12-06 22:12:25,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-12-06 22:12:25,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:12:25,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-12-06 22:12:25,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=925, Unknown=0, NotChecked=0, Total=1056 [2021-12-06 22:12:25,007 INFO L87 Difference]: Start difference. First operand 1044 states and 1581 transitions. Second operand has 33 states, 33 states have (on average 2.606060606060606) internal successors, (86), 33 states have internal predecessors, (86), 14 states have call successors, (56), 2 states have call predecessors, (56), 3 states have return successors, (56), 13 states have call predecessors, (56), 14 states have call successors, (56) [2021-12-06 22:12:32,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:12:32,659 INFO L93 Difference]: Finished difference Result 1634 states and 2486 transitions. [2021-12-06 22:12:32,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-12-06 22:12:32,661 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.606060606060606) internal successors, (86), 33 states have internal predecessors, (86), 14 states have call successors, (56), 2 states have call predecessors, (56), 3 states have return successors, (56), 13 states have call predecessors, (56), 14 states have call successors, (56) Word has length 184 [2021-12-06 22:12:32,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:12:32,667 INFO L225 Difference]: With dead ends: 1634 [2021-12-06 22:12:32,667 INFO L226 Difference]: Without dead ends: 1304 [2021-12-06 22:12:32,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1144, Invalid=6338, Unknown=0, NotChecked=0, Total=7482 [2021-12-06 22:12:32,669 INFO L933 BasicCegarLoop]: 149 mSDtfsCounter, 241 mSDsluCounter, 1330 mSDsCounter, 0 mSdLazyCounter, 1786 mSolverCounterSat, 608 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 1479 SdHoareTripleChecker+Invalid, 2394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 608 IncrementalHoareTripleChecker+Valid, 1786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-12-06 22:12:32,669 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 1479 Invalid, 2394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [608 Valid, 1786 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2021-12-06 22:12:32,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1304 states. [2021-12-06 22:12:33,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1304 to 1158. [2021-12-06 22:12:33,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1158 states, 638 states have (on average 1.2241379310344827) internal successors, (781), 638 states have internal predecessors, (781), 481 states have call successors, (481), 39 states have call predecessors, (481), 38 states have return successors, (480), 480 states have call predecessors, (480), 480 states have call successors, (480) [2021-12-06 22:12:33,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1158 states to 1158 states and 1742 transitions. [2021-12-06 22:12:33,434 INFO L78 Accepts]: Start accepts. Automaton has 1158 states and 1742 transitions. Word has length 184 [2021-12-06 22:12:33,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:12:33,434 INFO L470 AbstractCegarLoop]: Abstraction has 1158 states and 1742 transitions. [2021-12-06 22:12:33,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.606060606060606) internal successors, (86), 33 states have internal predecessors, (86), 14 states have call successors, (56), 2 states have call predecessors, (56), 3 states have return successors, (56), 13 states have call predecessors, (56), 14 states have call successors, (56) [2021-12-06 22:12:33,434 INFO L276 IsEmpty]: Start isEmpty. Operand 1158 states and 1742 transitions. [2021-12-06 22:12:33,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-12-06 22:12:33,438 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:12:33,438 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:12:33,457 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-12-06 22:12:33,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-12-06 22:12:33,639 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:12:33,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:12:33,640 INFO L85 PathProgramCache]: Analyzing trace with hash 270474124, now seen corresponding path program 11 times [2021-12-06 22:12:33,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:12:33,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919944451] [2021-12-06 22:12:33,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:12:33,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:12:33,664 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:12:33,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1519094263] [2021-12-06 22:12:33,665 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-12-06 22:12:33,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:12:33,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:12:33,668 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:12:33,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-12-06 22:12:33,838 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-12-06 22:12:33,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:12:33,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 24 conjunts are in the unsatisfiable core [2021-12-06 22:12:33,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-06 22:12:34,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1314 backedges. 645 proven. 37 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2021-12-06 22:12:34,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-06 22:12:52,987 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-06 22:12:52,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919944451] [2021-12-06 22:12:52,987 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-12-06 22:12:52,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519094263] [2021-12-06 22:12:52,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519094263] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-06 22:12:52,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-12-06 22:12:52,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-12-06 22:12:52,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787664617] [2021-12-06 22:12:52,988 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-12-06 22:12:52,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-12-06 22:12:52,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-06 22:12:52,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-12-06 22:12:52,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=667, Unknown=6, NotChecked=0, Total=756 [2021-12-06 22:12:52,988 INFO L87 Difference]: Start difference. First operand 1158 states and 1742 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:12:55,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-06 22:12:55,751 INFO L93 Difference]: Finished difference Result 1455 states and 2160 transitions. [2021-12-06 22:12:55,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-12-06 22:12:55,752 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) Word has length 186 [2021-12-06 22:12:55,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-06 22:12:55,758 INFO L225 Difference]: With dead ends: 1455 [2021-12-06 22:12:55,758 INFO L226 Difference]: Without dead ends: 1214 [2021-12-06 22:12:55,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 323 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=608, Invalid=2248, Unknown=6, NotChecked=0, Total=2862 [2021-12-06 22:12:55,759 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 100 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-12-06 22:12:55,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 708 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-12-06 22:12:55,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1214 states. [2021-12-06 22:12:56,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1214 to 1148. [2021-12-06 22:12:56,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1148 states, 634 states have (on average 1.2113564668769716) internal successors, (768), 637 states have internal predecessors, (768), 476 states have call successors, (476), 38 states have call predecessors, (476), 37 states have return successors, (475), 472 states have call predecessors, (475), 475 states have call successors, (475) [2021-12-06 22:12:56,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1148 states to 1148 states and 1719 transitions. [2021-12-06 22:12:56,526 INFO L78 Accepts]: Start accepts. Automaton has 1148 states and 1719 transitions. Word has length 186 [2021-12-06 22:12:56,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-06 22:12:56,527 INFO L470 AbstractCegarLoop]: Abstraction has 1148 states and 1719 transitions. [2021-12-06 22:12:56,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 15 states have internal predecessors, (52), 7 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (24), 7 states have call predecessors, (24), 7 states have call successors, (24) [2021-12-06 22:12:56,527 INFO L276 IsEmpty]: Start isEmpty. Operand 1148 states and 1719 transitions. [2021-12-06 22:12:56,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-12-06 22:12:56,530 INFO L506 BasicCegarLoop]: Found error trace [2021-12-06 22:12:56,530 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-12-06 22:12:56,550 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-12-06 22:12:56,731 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:12:56,731 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-06 22:12:56,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-06 22:12:56,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1802949980, now seen corresponding path program 12 times [2021-12-06 22:12:56,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-06 22:12:56,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947887414] [2021-12-06 22:12:56,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-06 22:12:56,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-06 22:12:56,757 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-12-06 22:12:56,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [982991666] [2021-12-06 22:12:56,757 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-12-06 22:12:56,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-06 22:12:56,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 [2021-12-06 22:12:56,760 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-06 22:12:56,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2191254e-33f3-4cd8-8d2e-4f3134864be9/bin/uautomizer-DrprNOufMa/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-12-06 22:13:17,042 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-12-06 22:13:17,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-12-06 22:13:17,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 77 conjunts are in the unsatisfiable core [2021-12-06 22:13:17,051 INFO L286 TraceCheckSpWp]: Computing forward predicates...