./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f8e1c903 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX --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 fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 10:50:28,884 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 10:50:28,886 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 10:50:28,928 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 10:50:28,933 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 10:50:28,934 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 10:50:28,937 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 10:50:28,940 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 10:50:28,943 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 10:50:28,949 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 10:50:28,951 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 10:50:28,956 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 10:50:28,957 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 10:50:28,969 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 10:50:28,973 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 10:50:28,980 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 10:50:28,982 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 10:50:28,985 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 10:50:28,990 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 10:50:28,996 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 10:50:29,003 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 10:50:29,005 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 10:50:29,008 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 10:50:29,010 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 10:50:29,014 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 10:50:29,015 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 10:50:29,015 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 10:50:29,017 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 10:50:29,018 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 10:50:29,019 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 10:50:29,020 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 10:50:29,021 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 10:50:29,022 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 10:50:29,023 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 10:50:29,025 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 10:50:29,025 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 10:50:29,027 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 10:50:29,027 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 10:50:29,028 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 10:50:29,029 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 10:50:29,030 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 10:50:29,031 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-11-09 10:50:29,066 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 10:50:29,071 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 10:50:29,072 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 10:50:29,072 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 10:50:29,074 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 10:50:29,075 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 10:50:29,075 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 10:50:29,075 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 10:50:29,076 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 10:50:29,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-09 10:50:29,078 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 10:50:29,078 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 10:50:29,078 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-09 10:50:29,079 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 10:50:29,079 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-09 10:50:29,079 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 10:50:29,080 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-09 10:50:29,080 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 10:50:29,080 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-09 10:50:29,081 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 10:50:29,081 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 10:50:29,081 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 10:50:29,082 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 10:50:29,082 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 10:50:29,082 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 10:50:29,083 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-09 10:50:29,083 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-09 10:50:29,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-09 10:50:29,084 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-09 10:50:29,086 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-09 10:50:29,087 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-09 10:50:29,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 10:50:29,088 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_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 [2021-11-09 10:50:29,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 10:50:29,445 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 10:50:29,449 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 10:50:29,451 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 10:50:29,452 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 10:50:29,453 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2021-11-09 10:50:29,553 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/69f560bfe/9e6976d691714b8ea0cce9dbd00d76df/FLAG8a89d9639 [2021-11-09 10:50:30,261 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 10:50:30,262 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2021-11-09 10:50:30,282 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/69f560bfe/9e6976d691714b8ea0cce9dbd00d76df/FLAG8a89d9639 [2021-11-09 10:50:30,514 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/69f560bfe/9e6976d691714b8ea0cce9dbd00d76df [2021-11-09 10:50:30,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 10:50:30,519 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-09 10:50:30,521 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 10:50:30,521 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 10:50:30,526 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 10:50:30,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 10:50:30" (1/1) ... [2021-11-09 10:50:30,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@790869a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:30, skipping insertion in model container [2021-11-09 10:50:30,529 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 10:50:30" (1/1) ... [2021-11-09 10:50:30,538 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 10:50:30,596 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 10:50:31,048 WARN L228 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_1b18acee-b5d4-441e-81a1-240965b77fa0/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i[24987,25000] [2021-11-09 10:50:31,061 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 10:50:31,078 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 10:50:31,168 WARN L228 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_1b18acee-b5d4-441e-81a1-240965b77fa0/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i[24987,25000] [2021-11-09 10:50:31,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 10:50:31,208 INFO L208 MainTranslator]: Completed translation [2021-11-09 10:50:31,209 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31 WrapperNode [2021-11-09 10:50:31,209 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 10:50:31,211 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-09 10:50:31,211 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-09 10:50:31,211 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-09 10:50:31,221 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,239 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,279 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-09 10:50:31,280 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 10:50:31,280 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 10:50:31,281 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 10:50:31,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,298 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,299 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,310 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,342 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,345 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,350 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 10:50:31,351 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 10:50:31,352 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 10:50:31,352 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 10:50:31,353 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (1/1) ... [2021-11-09 10:50:31,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 10:50:31,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:31,400 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 10:50:31,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 10:50:31,457 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-09 10:50:31,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-09 10:50:31,457 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-09 10:50:31,457 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-09 10:50:31,457 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-09 10:50:31,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-09 10:50:31,458 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-09 10:50:31,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 10:50:31,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 10:50:31,965 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 10:50:31,965 INFO L299 CfgBuilder]: Removed 27 assume(true) statements. [2021-11-09 10:50:31,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 10:50:31 BoogieIcfgContainer [2021-11-09 10:50:31,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 10:50:31,970 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 10:50:31,971 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 10:50:31,975 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 10:50:31,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 10:50:30" (1/3) ... [2021-11-09 10:50:31,976 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28e89353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 10:50:31, skipping insertion in model container [2021-11-09 10:50:31,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 10:50:31" (2/3) ... [2021-11-09 10:50:31,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28e89353 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 10:50:31, skipping insertion in model container [2021-11-09 10:50:31,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 10:50:31" (3/3) ... [2021-11-09 10:50:31,979 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2021-11-09 10:50:31,986 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 10:50:31,986 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-09 10:50:32,060 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 10:50:32,068 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-09 10:50:32,081 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-09 10:50:32,107 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 42 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-09 10:50:32,135 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:32,135 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:32,136 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:32,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:32,143 INFO L85 PathProgramCache]: Analyzing trace with hash 1882208553, now seen corresponding path program 1 times [2021-11-09 10:50:32,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:32,156 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021238564] [2021-11-09 10:50:32,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:32,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:32,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:50:32,353 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:32,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021238564] [2021-11-09 10:50:32,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021238564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:50:32,355 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 10:50:32,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-09 10:50:32,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672918582] [2021-11-09 10:50:32,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-09 10:50:32,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:32,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-09 10:50:32,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-09 10:50:32,385 INFO L87 Difference]: Start difference. First operand has 43 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 42 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:32,411 INFO L93 Difference]: Finished difference Result 84 states and 134 transitions. [2021-11-09 10:50:32,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-09 10:50:32,414 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-09 10:50:32,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:32,425 INFO L225 Difference]: With dead ends: 84 [2021-11-09 10:50:32,426 INFO L226 Difference]: Without dead ends: 33 [2021-11-09 10:50:32,429 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-09 10:50:32,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-09 10:50:32,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-09 10:50:32,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2021-11-09 10:50:32,474 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 7 [2021-11-09 10:50:32,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:32,475 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2021-11-09 10:50:32,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,476 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2021-11-09 10:50:32,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-09 10:50:32,477 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:32,477 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:32,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-09 10:50:32,478 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:32,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:32,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1810173915, now seen corresponding path program 1 times [2021-11-09 10:50:32,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:32,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099774527] [2021-11-09 10:50:32,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:32,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:32,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:32,579 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:50:32,579 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:32,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099774527] [2021-11-09 10:50:32,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099774527] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:50:32,581 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 10:50:32,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 10:50:32,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581887516] [2021-11-09 10:50:32,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-09 10:50:32,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:32,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-09 10:50:32,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 10:50:32,600 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:32,692 INFO L93 Difference]: Finished difference Result 64 states and 86 transitions. [2021-11-09 10:50:32,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-09 10:50:32,694 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-09 10:50:32,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:32,696 INFO L225 Difference]: With dead ends: 64 [2021-11-09 10:50:32,696 INFO L226 Difference]: Without dead ends: 51 [2021-11-09 10:50:32,698 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-09 10:50:32,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-09 10:50:32,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 34. [2021-11-09 10:50:32,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 33 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2021-11-09 10:50:32,715 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 7 [2021-11-09 10:50:32,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:32,716 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2021-11-09 10:50:32,717 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,717 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2021-11-09 10:50:32,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 10:50:32,719 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:32,720 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:32,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-09 10:50:32,720 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:32,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:32,724 INFO L85 PathProgramCache]: Analyzing trace with hash -176325417, now seen corresponding path program 1 times [2021-11-09 10:50:32,724 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:32,725 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442716935] [2021-11-09 10:50:32,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:32,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:32,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:32,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 10:50:32,838 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:32,838 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442716935] [2021-11-09 10:50:32,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442716935] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:50:32,839 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 10:50:32,839 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-09 10:50:32,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680490340] [2021-11-09 10:50:32,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 10:50:32,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:32,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 10:50:32,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 10:50:32,843 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:32,951 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2021-11-09 10:50:32,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 10:50:32,952 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-09 10:50:32,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:32,955 INFO L225 Difference]: With dead ends: 62 [2021-11-09 10:50:32,955 INFO L226 Difference]: Without dead ends: 46 [2021-11-09 10:50:32,956 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-09 10:50:32,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-09 10:50:32,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-11-09 10:50:32,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.3513513513513513) internal successors, (50), 37 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2021-11-09 10:50:32,975 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 12 [2021-11-09 10:50:32,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:32,975 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2021-11-09 10:50:32,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:32,976 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2021-11-09 10:50:32,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-09 10:50:32,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:32,977 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:32,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-09 10:50:32,978 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:32,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:32,978 INFO L85 PathProgramCache]: Analyzing trace with hash -254202918, now seen corresponding path program 1 times [2021-11-09 10:50:32,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:32,979 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058845092] [2021-11-09 10:50:32,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:32,980 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:33,227 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:50:33,227 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:33,228 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058845092] [2021-11-09 10:50:33,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058845092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:50:33,228 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 10:50:33,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-09 10:50:33,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436505099] [2021-11-09 10:50:33,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-09 10:50:33,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:33,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-09 10:50:33,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-09 10:50:33,232 INFO L87 Difference]: Start difference. First operand 38 states and 50 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:33,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:33,346 INFO L93 Difference]: Finished difference Result 94 states and 124 transitions. [2021-11-09 10:50:33,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 10:50:33,347 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-09 10:50:33,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:33,348 INFO L225 Difference]: With dead ends: 94 [2021-11-09 10:50:33,348 INFO L226 Difference]: Without dead ends: 63 [2021-11-09 10:50:33,349 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-09 10:50:33,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-09 10:50:33,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 59. [2021-11-09 10:50:33,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:33,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 78 transitions. [2021-11-09 10:50:33,361 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 78 transitions. Word has length 23 [2021-11-09 10:50:33,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:33,361 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 78 transitions. [2021-11-09 10:50:33,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:33,362 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 78 transitions. [2021-11-09 10:50:33,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-09 10:50:33,364 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:33,364 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:33,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-09 10:50:33,365 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:33,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:33,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1546151472, now seen corresponding path program 1 times [2021-11-09 10:50:33,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:33,366 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386052408] [2021-11-09 10:50:33,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:33,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:33,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:33,470 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-09 10:50:33,470 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:33,471 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386052408] [2021-11-09 10:50:33,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386052408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:33,471 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30040603] [2021-11-09 10:50:33,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:33,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:33,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:33,478 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:33,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-09 10:50:33,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:33,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-09 10:50:33,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:33,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:50:33,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30040603] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:33,768 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:50:33,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 8 [2021-11-09 10:50:33,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125461342] [2021-11-09 10:50:33,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 10:50:33,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:33,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 10:50:33,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-09 10:50:33,772 INFO L87 Difference]: Start difference. First operand 59 states and 78 transitions. Second operand has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:34,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:34,062 INFO L93 Difference]: Finished difference Result 162 states and 213 transitions. [2021-11-09 10:50:34,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 10:50:34,063 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-09 10:50:34,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:34,065 INFO L225 Difference]: With dead ends: 162 [2021-11-09 10:50:34,065 INFO L226 Difference]: Without dead ends: 114 [2021-11-09 10:50:34,066 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2021-11-09 10:50:34,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-09 10:50:34,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 68. [2021-11-09 10:50:34,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.2985074626865671) internal successors, (87), 67 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:34,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 87 transitions. [2021-11-09 10:50:34,079 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 87 transitions. Word has length 26 [2021-11-09 10:50:34,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:34,080 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 87 transitions. [2021-11-09 10:50:34,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:34,080 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 87 transitions. [2021-11-09 10:50:34,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 10:50:34,082 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:34,082 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:34,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-09 10:50:34,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:34,297 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:34,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:34,297 INFO L85 PathProgramCache]: Analyzing trace with hash -770683882, now seen corresponding path program 2 times [2021-11-09 10:50:34,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:34,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180465207] [2021-11-09 10:50:34,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:34,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:34,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:34,423 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 10:50:34,423 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:34,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180465207] [2021-11-09 10:50:34,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180465207] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:34,428 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092660121] [2021-11-09 10:50:34,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 10:50:34,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:34,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:34,433 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:34,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-09 10:50:34,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-09 10:50:34,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:50:34,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-09 10:50:34,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:34,924 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-09 10:50:34,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092660121] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:50:34,924 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-09 10:50:34,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-09 10:50:34,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368756997] [2021-11-09 10:50:34,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 10:50:34,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:34,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 10:50:34,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-09 10:50:34,929 INFO L87 Difference]: Start difference. First operand 68 states and 87 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:34,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:34,986 INFO L93 Difference]: Finished difference Result 83 states and 105 transitions. [2021-11-09 10:50:34,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 10:50:34,987 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-09 10:50:34,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:34,988 INFO L225 Difference]: With dead ends: 83 [2021-11-09 10:50:34,988 INFO L226 Difference]: Without dead ends: 81 [2021-11-09 10:50:34,990 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-09 10:50:34,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-09 10:50:35,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 70. [2021-11-09 10:50:35,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.289855072463768) internal successors, (89), 69 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:35,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 89 transitions. [2021-11-09 10:50:35,012 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 89 transitions. Word has length 34 [2021-11-09 10:50:35,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:35,013 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 89 transitions. [2021-11-09 10:50:35,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:35,013 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 89 transitions. [2021-11-09 10:50:35,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-09 10:50:35,015 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:35,015 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:35,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-09 10:50:35,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:35,217 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:35,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:35,217 INFO L85 PathProgramCache]: Analyzing trace with hash -2123237744, now seen corresponding path program 1 times [2021-11-09 10:50:35,217 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:35,218 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693873520] [2021-11-09 10:50:35,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:35,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:35,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:35,336 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 10:50:35,337 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:35,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693873520] [2021-11-09 10:50:35,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693873520] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:35,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804872565] [2021-11-09 10:50:35,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:35,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:35,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:35,341 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:35,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-09 10:50:35,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:35,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-09 10:50:35,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:35,709 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 13 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:50:35,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804872565] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:35,710 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:50:35,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8] total 11 [2021-11-09 10:50:35,711 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757338932] [2021-11-09 10:50:35,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-09 10:50:35,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:35,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-09 10:50:35,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-09 10:50:35,715 INFO L87 Difference]: Start difference. First operand 70 states and 89 transitions. Second operand has 11 states, 11 states have (on average 5.909090909090909) internal successors, (65), 11 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:36,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:36,180 INFO L93 Difference]: Finished difference Result 205 states and 262 transitions. [2021-11-09 10:50:36,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-09 10:50:36,181 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.909090909090909) internal successors, (65), 11 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-09 10:50:36,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:36,183 INFO L225 Difference]: With dead ends: 205 [2021-11-09 10:50:36,184 INFO L226 Difference]: Without dead ends: 168 [2021-11-09 10:50:36,185 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=172, Invalid=380, Unknown=0, NotChecked=0, Total=552 [2021-11-09 10:50:36,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-09 10:50:36,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 114. [2021-11-09 10:50:36,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.2654867256637168) internal successors, (143), 113 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:36,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 143 transitions. [2021-11-09 10:50:36,228 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 143 transitions. Word has length 41 [2021-11-09 10:50:36,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:36,229 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 143 transitions. [2021-11-09 10:50:36,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 5.909090909090909) internal successors, (65), 11 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:36,229 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 143 transitions. [2021-11-09 10:50:36,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-09 10:50:36,236 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:36,236 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:36,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-09 10:50:36,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:36,457 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:36,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:36,458 INFO L85 PathProgramCache]: Analyzing trace with hash -1388929204, now seen corresponding path program 2 times [2021-11-09 10:50:36,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:36,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920315974] [2021-11-09 10:50:36,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:36,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:36,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:36,588 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 10:50:36,588 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:36,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920315974] [2021-11-09 10:50:36,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [920315974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:36,594 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786623098] [2021-11-09 10:50:36,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 10:50:36,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:36,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:36,601 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:36,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-09 10:50:36,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 10:50:36,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:50:36,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-09 10:50:36,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:36,927 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 10:50:36,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786623098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:36,928 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:50:36,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-09 10:50:36,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739495363] [2021-11-09 10:50:36,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 10:50:36,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:36,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 10:50:36,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-11-09 10:50:36,931 INFO L87 Difference]: Start difference. First operand 114 states and 143 transitions. Second operand has 12 states, 12 states have (on average 4.25) internal successors, (51), 12 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:37,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:37,192 INFO L93 Difference]: Finished difference Result 217 states and 269 transitions. [2021-11-09 10:50:37,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-09 10:50:37,194 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.25) internal successors, (51), 12 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-09 10:50:37,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:37,195 INFO L225 Difference]: With dead ends: 217 [2021-11-09 10:50:37,196 INFO L226 Difference]: Without dead ends: 119 [2021-11-09 10:50:37,200 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=114, Invalid=228, Unknown=0, NotChecked=0, Total=342 [2021-11-09 10:50:37,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-09 10:50:37,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 117. [2021-11-09 10:50:37,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.2586206896551724) internal successors, (146), 116 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:37,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 146 transitions. [2021-11-09 10:50:37,217 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 146 transitions. Word has length 46 [2021-11-09 10:50:37,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:37,220 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 146 transitions. [2021-11-09 10:50:37,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.25) internal successors, (51), 12 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:37,220 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 146 transitions. [2021-11-09 10:50:37,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-09 10:50:37,226 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:37,226 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:37,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-09 10:50:37,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-09 10:50:37,441 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:37,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:37,442 INFO L85 PathProgramCache]: Analyzing trace with hash -1728220938, now seen corresponding path program 3 times [2021-11-09 10:50:37,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:37,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813706277] [2021-11-09 10:50:37,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:37,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:37,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:37,583 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:50:37,584 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:37,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813706277] [2021-11-09 10:50:37,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813706277] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:37,584 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521684273] [2021-11-09 10:50:37,585 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 10:50:37,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:37,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:37,593 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:37,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-09 10:50:37,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-09 10:50:37,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:50:37,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-09 10:50:37,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:37,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:50:38,037 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 10:50:38,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-09 10:50:38,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 38 [2021-11-09 10:50:38,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 35 [2021-11-09 10:50:38,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 49 [2021-11-09 10:50:38,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 38 [2021-11-09 10:50:38,900 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:50:38,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 58 treesize of output 60 [2021-11-09 10:50:38,933 INFO L354 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2021-11-09 10:50:38,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 67 treesize of output 69 [2021-11-09 10:50:39,640 INFO L354 Elim1Store]: treesize reduction 52, result has 5.5 percent of original size [2021-11-09 10:50:39,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 97 treesize of output 57 [2021-11-09 10:50:39,659 INFO L354 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2021-11-09 10:50:39,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 45 treesize of output 31 [2021-11-09 10:50:39,714 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 5 proven. 14 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 10:50:39,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521684273] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:39,715 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:50:39,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 20 [2021-11-09 10:50:39,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738071753] [2021-11-09 10:50:39,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-09 10:50:39,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:39,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-09 10:50:39,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2021-11-09 10:50:39,719 INFO L87 Difference]: Start difference. First operand 117 states and 146 transitions. Second operand has 20 states, 20 states have (on average 3.95) internal successors, (79), 20 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:46,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:46,019 INFO L93 Difference]: Finished difference Result 367 states and 456 transitions. [2021-11-09 10:50:46,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-09 10:50:46,019 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.95) internal successors, (79), 20 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-09 10:50:46,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:46,023 INFO L225 Difference]: With dead ends: 367 [2021-11-09 10:50:46,023 INFO L226 Difference]: Without dead ends: 316 [2021-11-09 10:50:46,027 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=1028, Invalid=4522, Unknown=0, NotChecked=0, Total=5550 [2021-11-09 10:50:46,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-11-09 10:50:46,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 164. [2021-11-09 10:50:46,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 163 states have (on average 1.2760736196319018) internal successors, (208), 163 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:46,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 208 transitions. [2021-11-09 10:50:46,065 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 208 transitions. Word has length 49 [2021-11-09 10:50:46,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:46,066 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 208 transitions. [2021-11-09 10:50:46,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.95) internal successors, (79), 20 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:46,066 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 208 transitions. [2021-11-09 10:50:46,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-09 10:50:46,085 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:46,085 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:46,118 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-09 10:50:46,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:46,297 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:46,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:46,298 INFO L85 PathProgramCache]: Analyzing trace with hash 1242542659, now seen corresponding path program 1 times [2021-11-09 10:50:46,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:46,298 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865744488] [2021-11-09 10:50:46,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:46,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:46,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:46,459 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 10:50:46,460 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:46,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865744488] [2021-11-09 10:50:46,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865744488] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:46,465 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544946054] [2021-11-09 10:50:46,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:46,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:46,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:46,467 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:46,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-09 10:50:46,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:46,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-09 10:50:46,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:46,894 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 22 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-09 10:50:46,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544946054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:46,895 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:50:46,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-11-09 10:50:46,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148298598] [2021-11-09 10:50:46,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-09 10:50:46,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:46,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-09 10:50:46,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-09 10:50:46,897 INFO L87 Difference]: Start difference. First operand 164 states and 208 transitions. Second operand has 10 states, 10 states have (on average 5.2) internal successors, (52), 10 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:47,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:47,183 INFO L93 Difference]: Finished difference Result 360 states and 459 transitions. [2021-11-09 10:50:47,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 10:50:47,184 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 10 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-09 10:50:47,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:47,186 INFO L225 Difference]: With dead ends: 360 [2021-11-09 10:50:47,187 INFO L226 Difference]: Without dead ends: 243 [2021-11-09 10:50:47,188 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2021-11-09 10:50:47,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-09 10:50:47,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 167. [2021-11-09 10:50:47,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.2710843373493976) internal successors, (211), 166 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:47,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 211 transitions. [2021-11-09 10:50:47,226 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 211 transitions. Word has length 50 [2021-11-09 10:50:47,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:47,227 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 211 transitions. [2021-11-09 10:50:47,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 10 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:47,227 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 211 transitions. [2021-11-09 10:50:47,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-09 10:50:47,228 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:47,228 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:47,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-09 10:50:47,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-09 10:50:47,446 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:47,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:47,446 INFO L85 PathProgramCache]: Analyzing trace with hash 272815509, now seen corresponding path program 2 times [2021-11-09 10:50:47,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:47,446 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420716783] [2021-11-09 10:50:47,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:47,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:47,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:48,234 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-09 10:50:48,235 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:48,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420716783] [2021-11-09 10:50:48,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420716783] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:48,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123177386] [2021-11-09 10:50:48,235 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 10:50:48,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:48,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:48,239 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:48,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-09 10:50:48,501 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 10:50:48,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:50:48,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-09 10:50:48,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:50:48,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:50:48,642 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 10:50:48,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-09 10:50:48,845 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-09 10:50:48,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2021-11-09 10:50:49,195 INFO L354 Elim1Store]: treesize reduction 70, result has 28.6 percent of original size [2021-11-09 10:50:49,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 35 treesize of output 53 [2021-11-09 10:50:49,634 INFO L354 Elim1Store]: treesize reduction 40, result has 29.8 percent of original size [2021-11-09 10:50:49,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 38 treesize of output 44 [2021-11-09 10:50:49,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 24 [2021-11-09 10:50:50,223 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:50:50,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 46 [2021-11-09 10:50:50,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 15 [2021-11-09 10:50:50,417 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 10:50:50,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 48 [2021-11-09 10:50:50,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2021-11-09 10:50:50,596 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-09 10:50:50,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 112 treesize of output 88 [2021-11-09 10:50:50,611 INFO L354 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2021-11-09 10:50:50,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 149 treesize of output 151 [2021-11-09 10:50:51,791 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-09 10:50:51,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 159 treesize of output 129 [2021-11-09 10:50:51,927 INFO L354 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2021-11-09 10:50:51,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 111 treesize of output 45 [2021-11-09 10:50:51,948 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 10:50:51,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123177386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:51,948 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:50:51,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 29 [2021-11-09 10:50:51,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612012563] [2021-11-09 10:50:51,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-09 10:50:51,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:50:51,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-09 10:50:51,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=737, Unknown=0, NotChecked=0, Total=812 [2021-11-09 10:50:51,951 INFO L87 Difference]: Start difference. First operand 167 states and 211 transitions. Second operand has 29 states, 29 states have (on average 2.5517241379310347) internal successors, (74), 29 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:57,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:50:57,599 INFO L93 Difference]: Finished difference Result 294 states and 361 transitions. [2021-11-09 10:50:57,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-09 10:50:57,600 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5517241379310347) internal successors, (74), 29 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-09 10:50:57,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:50:57,602 INFO L225 Difference]: With dead ends: 294 [2021-11-09 10:50:57,602 INFO L226 Difference]: Without dead ends: 244 [2021-11-09 10:50:57,604 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=640, Invalid=2116, Unknown=0, NotChecked=0, Total=2756 [2021-11-09 10:50:57,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-09 10:50:57,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 169. [2021-11-09 10:50:57,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 168 states have (on average 1.2678571428571428) internal successors, (213), 168 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:57,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 213 transitions. [2021-11-09 10:50:57,660 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 213 transitions. Word has length 50 [2021-11-09 10:50:57,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:50:57,661 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 213 transitions. [2021-11-09 10:50:57,661 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.5517241379310347) internal successors, (74), 29 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:50:57,662 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 213 transitions. [2021-11-09 10:50:57,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-09 10:50:57,663 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:50:57,663 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:50:57,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-09 10:50:57,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-09 10:50:57,877 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:50:57,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:50:57,878 INFO L85 PathProgramCache]: Analyzing trace with hash -2034085866, now seen corresponding path program 3 times [2021-11-09 10:50:57,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:50:57,878 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263900887] [2021-11-09 10:50:57,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:50:57,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:50:57,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:50:59,370 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 10:50:59,370 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:50:59,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263900887] [2021-11-09 10:50:59,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263900887] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:50:59,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53043670] [2021-11-09 10:50:59,371 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 10:50:59,371 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:50:59,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:50:59,373 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:50:59,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-09 10:50:59,959 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-09 10:50:59,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:50:59,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-09 10:50:59,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:51:00,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:51:00,254 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-09 10:51:00,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2021-11-09 10:51:00,559 INFO L354 Elim1Store]: treesize reduction 44, result has 30.2 percent of original size [2021-11-09 10:51:00,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 22 treesize of output 33 [2021-11-09 10:51:00,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-09 10:51:00,999 INFO L354 Elim1Store]: treesize reduction 24, result has 41.5 percent of original size [2021-11-09 10:51:00,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 25 treesize of output 29 [2021-11-09 10:51:01,247 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:51:01,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 39 [2021-11-09 10:51:01,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:51:01,643 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-09 10:51:01,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 96 treesize of output 77 [2021-11-09 10:51:01,666 INFO L354 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2021-11-09 10:51:01,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 125 treesize of output 128 [2021-11-09 10:51:01,916 INFO L354 Elim1Store]: treesize reduction 41, result has 21.2 percent of original size [2021-11-09 10:51:01,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 127 treesize of output 125 [2021-11-09 10:51:01,958 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-11-09 10:51:01,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 116 treesize of output 75 [2021-11-09 10:51:02,218 INFO L354 Elim1Store]: treesize reduction 92, result has 22.0 percent of original size [2021-11-09 10:51:02,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 13 case distinctions, treesize of input 143 treesize of output 109 [2021-11-09 10:51:02,246 INFO L354 Elim1Store]: treesize reduction 88, result has 23.5 percent of original size [2021-11-09 10:51:02,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 189 treesize of output 194 [2021-11-09 10:51:04,029 INFO L354 Elim1Store]: treesize reduction 178, result has 3.8 percent of original size [2021-11-09 10:51:04,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 9 new quantified variables, introduced 15 case distinctions, treesize of input 255 treesize of output 200 [2021-11-09 10:51:04,243 INFO L354 Elim1Store]: treesize reduction 32, result has 34.7 percent of original size [2021-11-09 10:51:04,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 10 case distinctions, treesize of input 160 treesize of output 61 [2021-11-09 10:51:04,276 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 22 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-09 10:51:04,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53043670] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:04,276 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:51:04,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 33 [2021-11-09 10:51:04,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975717885] [2021-11-09 10:51:04,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-09 10:51:04,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:51:04,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-09 10:51:04,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=974, Unknown=0, NotChecked=0, Total=1056 [2021-11-09 10:51:04,281 INFO L87 Difference]: Start difference. First operand 169 states and 213 transitions. Second operand has 33 states, 33 states have (on average 2.303030303030303) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:28,497 WARN L207 SmtUtils]: Spent 8.58 s on a formula simplification. DAG size of input: 301 DAG size of output: 238 [2021-11-09 10:51:41,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:51:41,267 INFO L93 Difference]: Finished difference Result 341 states and 425 transitions. [2021-11-09 10:51:41,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-09 10:51:41,268 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.303030303030303) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-09 10:51:41,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:51:41,271 INFO L225 Difference]: With dead ends: 341 [2021-11-09 10:51:41,271 INFO L226 Difference]: Without dead ends: 289 [2021-11-09 10:51:41,274 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=740, Invalid=2682, Unknown=0, NotChecked=0, Total=3422 [2021-11-09 10:51:41,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-09 10:51:41,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 171. [2021-11-09 10:51:41,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.2647058823529411) internal successors, (215), 170 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:41,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 215 transitions. [2021-11-09 10:51:41,377 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 215 transitions. Word has length 51 [2021-11-09 10:51:41,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:51:41,377 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 215 transitions. [2021-11-09 10:51:41,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.303030303030303) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:41,378 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 215 transitions. [2021-11-09 10:51:41,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-09 10:51:41,379 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:51:41,379 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:51:41,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-09 10:51:41,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:41,596 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:51:41,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:51:41,596 INFO L85 PathProgramCache]: Analyzing trace with hash 384528066, now seen corresponding path program 1 times [2021-11-09 10:51:41,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:51:41,597 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183986577] [2021-11-09 10:51:41,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:51:41,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:51:41,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:42,072 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 10:51:42,073 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:51:42,073 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183986577] [2021-11-09 10:51:42,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183986577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:42,073 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117233330] [2021-11-09 10:51:42,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:51:42,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:42,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:51:42,076 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:51:42,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-09 10:51:42,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:42,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-09 10:51:42,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:51:43,153 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:51:43,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-09 10:51:43,170 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:51:43,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-09 10:51:43,417 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:51:43,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-09 10:51:43,432 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:51:43,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-09 10:51:43,504 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [ULTIMATE.start_sll_create_~new_head~0.base] [2021-11-09 10:51:43,505 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-09 10:51:43,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-11-09 10:51:43,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939085025] [2021-11-09 10:51:43,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 10:51:43,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:51:43,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 10:51:43,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-11-09 10:51:43,507 INFO L87 Difference]: Start difference. First operand 171 states and 215 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:43,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:51:43,947 INFO L93 Difference]: Finished difference Result 453 states and 563 transitions. [2021-11-09 10:51:43,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 10:51:43,948 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-09 10:51:43,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:51:43,952 INFO L225 Difference]: With dead ends: 453 [2021-11-09 10:51:43,952 INFO L226 Difference]: Without dead ends: 298 [2021-11-09 10:51:43,953 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 10 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2021-11-09 10:51:43,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-09 10:51:44,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 225. [2021-11-09 10:51:44,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.2142857142857142) internal successors, (272), 224 states have internal predecessors, (272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:44,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 272 transitions. [2021-11-09 10:51:44,046 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 272 transitions. Word has length 52 [2021-11-09 10:51:44,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:51:44,048 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 272 transitions. [2021-11-09 10:51:44,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 9 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:44,049 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 272 transitions. [2021-11-09 10:51:44,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-09 10:51:44,050 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:51:44,050 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:51:44,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-09 10:51:44,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-09 10:51:44,277 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:51:44,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:51:44,278 INFO L85 PathProgramCache]: Analyzing trace with hash -533584459, now seen corresponding path program 4 times [2021-11-09 10:51:44,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:51:44,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226116205] [2021-11-09 10:51:44,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:51:44,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:51:44,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:44,504 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-09 10:51:44,504 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:51:44,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226116205] [2021-11-09 10:51:44,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226116205] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:44,505 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623143693] [2021-11-09 10:51:44,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 10:51:44,505 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:44,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:51:44,509 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:51:44,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-09 10:51:45,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 10:51:45,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:51:45,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-09 10:51:45,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:51:45,716 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-09 10:51:45,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623143693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:45,717 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:51:45,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2021-11-09 10:51:45,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987640312] [2021-11-09 10:51:45,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-09 10:51:45,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:51:45,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-09 10:51:45,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-09 10:51:45,720 INFO L87 Difference]: Start difference. First operand 225 states and 272 transitions. Second operand has 16 states, 16 states have (on average 3.6875) internal successors, (59), 16 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:46,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:51:46,513 INFO L93 Difference]: Finished difference Result 371 states and 460 transitions. [2021-11-09 10:51:46,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-09 10:51:46,514 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 16 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-09 10:51:46,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:51:46,517 INFO L225 Difference]: With dead ends: 371 [2021-11-09 10:51:46,517 INFO L226 Difference]: Without dead ends: 317 [2021-11-09 10:51:46,518 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=160, Invalid=652, Unknown=0, NotChecked=0, Total=812 [2021-11-09 10:51:46,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-09 10:51:46,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 250. [2021-11-09 10:51:46,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 249 states have (on average 1.2289156626506024) internal successors, (306), 249 states have internal predecessors, (306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:46,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 306 transitions. [2021-11-09 10:51:46,640 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 306 transitions. Word has length 52 [2021-11-09 10:51:46,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:51:46,641 INFO L470 AbstractCegarLoop]: Abstraction has 250 states and 306 transitions. [2021-11-09 10:51:46,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.6875) internal successors, (59), 16 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:46,641 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 306 transitions. [2021-11-09 10:51:46,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-09 10:51:46,642 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:51:46,643 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1] [2021-11-09 10:51:46,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-09 10:51:46,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:46,861 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:51:46,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:51:46,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1262681098, now seen corresponding path program 5 times [2021-11-09 10:51:46,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:51:46,862 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459251601] [2021-11-09 10:51:46,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:51:46,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:51:46,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:47,146 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-09 10:51:47,147 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:51:47,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459251601] [2021-11-09 10:51:47,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459251601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:47,147 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022792662] [2021-11-09 10:51:47,147 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-09 10:51:47,147 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:47,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:51:47,148 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:51:47,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-09 10:51:48,052 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-09 10:51:48,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:51:48,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-09 10:51:48,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:51:48,822 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 10:51:48,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022792662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:48,823 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:51:48,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 26 [2021-11-09 10:51:48,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765691805] [2021-11-09 10:51:48,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-09 10:51:48,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:51:48,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-09 10:51:48,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2021-11-09 10:51:48,826 INFO L87 Difference]: Start difference. First operand 250 states and 306 transitions. Second operand has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 26 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:50,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:51:50,719 INFO L93 Difference]: Finished difference Result 379 states and 476 transitions. [2021-11-09 10:51:50,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-09 10:51:50,720 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 26 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-09 10:51:50,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:51:50,722 INFO L225 Difference]: With dead ends: 379 [2021-11-09 10:51:50,722 INFO L226 Difference]: Without dead ends: 326 [2021-11-09 10:51:50,723 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=363, Invalid=2187, Unknown=0, NotChecked=0, Total=2550 [2021-11-09 10:51:50,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-11-09 10:51:50,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 241. [2021-11-09 10:51:50,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.2208333333333334) internal successors, (293), 240 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:50,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 293 transitions. [2021-11-09 10:51:50,834 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 293 transitions. Word has length 53 [2021-11-09 10:51:50,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:51:50,834 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 293 transitions. [2021-11-09 10:51:50,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.1538461538461537) internal successors, (82), 26 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:50,835 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 293 transitions. [2021-11-09 10:51:50,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-09 10:51:50,836 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:51:50,836 INFO L513 BasicCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1] [2021-11-09 10:51:50,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-09 10:51:51,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-09 10:51:51,061 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:51:51,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:51:51,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1905126869, now seen corresponding path program 6 times [2021-11-09 10:51:51,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:51:51,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469021064] [2021-11-09 10:51:51,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:51:51,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:51:51,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:51,368 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-09 10:51:51,368 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:51:51,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469021064] [2021-11-09 10:51:51,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469021064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:51,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923452053] [2021-11-09 10:51:51,369 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-09 10:51:51,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:51,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:51:51,370 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:51:51,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-09 10:51:52,322 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-09 10:51:52,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:51:52,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-09 10:51:52,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:51:52,813 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-09 10:51:52,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923452053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:52,814 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:51:52,814 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 13 [2021-11-09 10:51:52,814 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493125283] [2021-11-09 10:51:52,815 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 10:51:52,815 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:51:52,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 10:51:52,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-09 10:51:52,817 INFO L87 Difference]: Start difference. First operand 241 states and 293 transitions. Second operand has 13 states, 13 states have (on average 4.153846153846154) internal successors, (54), 13 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:53,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:51:53,470 INFO L93 Difference]: Finished difference Result 334 states and 413 transitions. [2021-11-09 10:51:53,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-09 10:51:53,471 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.153846153846154) internal successors, (54), 13 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-09 10:51:53,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:51:53,473 INFO L225 Difference]: With dead ends: 334 [2021-11-09 10:51:53,474 INFO L226 Difference]: Without dead ends: 287 [2021-11-09 10:51:53,474 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-11-09 10:51:53,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-09 10:51:53,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 251. [2021-11-09 10:51:53,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.22) internal successors, (305), 250 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:53,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 305 transitions. [2021-11-09 10:51:53,606 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 305 transitions. Word has length 54 [2021-11-09 10:51:53,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:51:53,606 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 305 transitions. [2021-11-09 10:51:53,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 4.153846153846154) internal successors, (54), 13 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:51:53,607 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 305 transitions. [2021-11-09 10:51:53,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-09 10:51:53,608 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:51:53,609 INFO L513 BasicCegarLoop]: trace histogram [6, 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, 1, 1, 1, 1, 1, 1] [2021-11-09 10:51:53,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-09 10:51:53,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-09 10:51:53,833 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:51:53,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:51:53,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1322926038, now seen corresponding path program 7 times [2021-11-09 10:51:53,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:51:53,834 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814721654] [2021-11-09 10:51:53,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:51:53,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:51:53,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:55,804 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 14 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-09 10:51:55,805 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:51:55,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814721654] [2021-11-09 10:51:55,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1814721654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:51:55,805 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768285331] [2021-11-09 10:51:55,805 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-09 10:51:55,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:51:55,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:51:55,806 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:51:55,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-09 10:51:56,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:51:56,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-09 10:51:56,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:51:56,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:51:56,713 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 10:51:56,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-09 10:51:56,994 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-09 10:51:56,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2021-11-09 10:51:57,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:51:57,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:51:57,485 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-09 10:51:57,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 27 treesize of output 45 [2021-11-09 10:51:57,897 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:51:57,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 53 [2021-11-09 10:51:57,913 INFO L354 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2021-11-09 10:51:57,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 67 treesize of output 66 [2021-11-09 10:51:58,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:51:58,138 INFO L354 Elim1Store]: treesize reduction 16, result has 56.8 percent of original size [2021-11-09 10:51:58,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 30 treesize of output 36 [2021-11-09 10:51:58,469 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-09 10:51:58,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 92 treesize of output 81 [2021-11-09 10:51:58,515 INFO L354 Elim1Store]: treesize reduction 88, result has 23.5 percent of original size [2021-11-09 10:51:58,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 121 treesize of output 123 [2021-11-09 10:51:59,009 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-09 10:51:59,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 133 treesize of output 108 [2021-11-09 10:51:59,046 INFO L354 Elim1Store]: treesize reduction 192, result has 19.3 percent of original size [2021-11-09 10:51:59,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 170 treesize of output 179 [2021-11-09 10:51:59,345 INFO L354 Elim1Store]: treesize reduction 96, result has 18.6 percent of original size [2021-11-09 10:51:59,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 12 case distinctions, treesize of input 184 treesize of output 121 [2021-11-09 10:51:59,403 INFO L354 Elim1Store]: treesize reduction 240, result has 16.1 percent of original size [2021-11-09 10:51:59,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 2 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 173 treesize of output 177 [2021-11-09 10:51:59,742 INFO L354 Elim1Store]: treesize reduction 144, result has 16.8 percent of original size [2021-11-09 10:51:59,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 9 new quantified variables, introduced 19 case distinctions, treesize of input 195 treesize of output 135 [2021-11-09 10:51:59,788 INFO L354 Elim1Store]: treesize reduction 352, result has 16.4 percent of original size [2021-11-09 10:51:59,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 241 treesize of output 252 [2021-11-09 10:52:02,245 INFO L354 Elim1Store]: treesize reduction 450, result has 7.6 percent of original size [2021-11-09 10:52:02,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 1 disjoint index pairs (out of 45 index pairs), introduced 20 new quantified variables, introduced 45 case distinctions, treesize of input 495 treesize of output 205 [2021-11-09 10:52:02,399 INFO L354 Elim1Store]: treesize reduction 408, result has 3.1 percent of original size [2021-11-09 10:52:02,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 1 disjoint index pairs (out of 45 index pairs), introduced 14 new quantified variables, introduced 45 case distinctions, treesize of input 115 treesize of output 95 [2021-11-09 10:52:02,433 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-09 10:52:02,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768285331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:52:02,434 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:52:02,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 37 [2021-11-09 10:52:02,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620218436] [2021-11-09 10:52:02,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-09 10:52:02,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:52:02,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-09 10:52:02,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1235, Unknown=0, NotChecked=0, Total=1332 [2021-11-09 10:52:02,438 INFO L87 Difference]: Start difference. First operand 251 states and 305 transitions. Second operand has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 37 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:10,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:53:10,514 INFO L93 Difference]: Finished difference Result 436 states and 536 transitions. [2021-11-09 10:53:10,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-09 10:53:10,515 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 37 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-09 10:53:10,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:53:10,517 INFO L225 Difference]: With dead ends: 436 [2021-11-09 10:53:10,518 INFO L226 Difference]: Without dead ends: 365 [2021-11-09 10:53:10,520 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 40.5s TimeCoverageRelationStatistics Valid=499, Invalid=3155, Unknown=6, NotChecked=0, Total=3660 [2021-11-09 10:53:10,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-11-09 10:53:10,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 289. [2021-11-09 10:53:10,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.2256944444444444) internal successors, (353), 288 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:10,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 353 transitions. [2021-11-09 10:53:10,684 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 353 transitions. Word has length 55 [2021-11-09 10:53:10,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:53:10,684 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 353 transitions. [2021-11-09 10:53:10,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 37 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:10,685 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 353 transitions. [2021-11-09 10:53:10,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-09 10:53:10,686 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:53:10,686 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:53:10,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-09 10:53:10,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-09 10:53:10,901 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:53:10,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:53:10,901 INFO L85 PathProgramCache]: Analyzing trace with hash 1677557224, now seen corresponding path program 1 times [2021-11-09 10:53:10,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:53:10,902 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518385945] [2021-11-09 10:53:10,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:53:10,902 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:53:10,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:53:11,118 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-09 10:53:11,118 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:53:11,119 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518385945] [2021-11-09 10:53:11,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518385945] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:53:11,119 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [452005542] [2021-11-09 10:53:11,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:53:11,119 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:53:11,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:53:11,121 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:53:11,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-09 10:53:12,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:53:12,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-09 10:53:12,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:53:12,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:53:12,244 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 10:53:12,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-11-09 10:53:12,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:53:12,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:53:12,565 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 10:53:12,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-09 10:53:12,579 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-09 10:53:12,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2021-11-09 10:53:13,166 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-09 10:53:13,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 36 [2021-11-09 10:53:13,170 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-09 10:53:13,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 17 [2021-11-09 10:53:13,194 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-09 10:53:13,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [452005542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:53:13,194 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:53:13,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2021-11-09 10:53:13,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320078819] [2021-11-09 10:53:13,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 10:53:13,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:53:13,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 10:53:13,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-11-09 10:53:13,196 INFO L87 Difference]: Start difference. First operand 289 states and 353 transitions. Second operand has 15 states, 15 states have (on average 4.733333333333333) internal successors, (71), 15 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:13,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:53:13,643 INFO L93 Difference]: Finished difference Result 350 states and 425 transitions. [2021-11-09 10:53:13,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 10:53:13,643 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.733333333333333) internal successors, (71), 15 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-09 10:53:13,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:53:13,646 INFO L225 Difference]: With dead ends: 350 [2021-11-09 10:53:13,646 INFO L226 Difference]: Without dead ends: 298 [2021-11-09 10:53:13,647 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=122, Invalid=340, Unknown=0, NotChecked=0, Total=462 [2021-11-09 10:53:13,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-09 10:53:13,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 279. [2021-11-09 10:53:13,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.2194244604316546) internal successors, (339), 278 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:13,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 339 transitions. [2021-11-09 10:53:13,783 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 339 transitions. Word has length 57 [2021-11-09 10:53:13,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:53:13,784 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 339 transitions. [2021-11-09 10:53:13,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 4.733333333333333) internal successors, (71), 15 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:13,784 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 339 transitions. [2021-11-09 10:53:13,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-09 10:53:13,786 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:53:13,786 INFO L513 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 3, 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] [2021-11-09 10:53:13,835 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-09 10:53:14,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-09 10:53:14,001 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:53:14,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:53:14,002 INFO L85 PathProgramCache]: Analyzing trace with hash -1495529620, now seen corresponding path program 8 times [2021-11-09 10:53:14,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:53:14,002 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455628602] [2021-11-09 10:53:14,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:53:14,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:53:14,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:53:14,137 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 18 proven. 31 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-09 10:53:14,137 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:53:14,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455628602] [2021-11-09 10:53:14,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455628602] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:53:14,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903752203] [2021-11-09 10:53:14,138 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 10:53:14,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:53:14,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:53:14,139 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:53:14,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-09 10:53:15,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-09 10:53:15,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:53:15,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-09 10:53:15,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:53:15,686 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-09 10:53:15,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1903752203] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:53:15,686 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:53:15,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-11-09 10:53:15,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273916055] [2021-11-09 10:53:15,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 10:53:15,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:53:15,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 10:53:15,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-09 10:53:15,689 INFO L87 Difference]: Start difference. First operand 279 states and 339 transitions. Second operand has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 12 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:16,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:53:16,273 INFO L93 Difference]: Finished difference Result 549 states and 672 transitions. [2021-11-09 10:53:16,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-09 10:53:16,274 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 12 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-09 10:53:16,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:53:16,277 INFO L225 Difference]: With dead ends: 549 [2021-11-09 10:53:16,278 INFO L226 Difference]: Without dead ends: 429 [2021-11-09 10:53:16,278 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=127, Invalid=293, Unknown=0, NotChecked=0, Total=420 [2021-11-09 10:53:16,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 429 states. [2021-11-09 10:53:16,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 429 to 285. [2021-11-09 10:53:16,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.2147887323943662) internal successors, (345), 284 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:16,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 345 transitions. [2021-11-09 10:53:16,385 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 345 transitions. Word has length 58 [2021-11-09 10:53:16,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:53:16,385 INFO L470 AbstractCegarLoop]: Abstraction has 285 states and 345 transitions. [2021-11-09 10:53:16,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.916666666666667) internal successors, (59), 12 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:53:16,386 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 345 transitions. [2021-11-09 10:53:16,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-09 10:53:16,387 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:53:16,387 INFO L513 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 4, 3, 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] [2021-11-09 10:53:16,420 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-09 10:53:16,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:53:16,593 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:53:16,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:53:16,594 INFO L85 PathProgramCache]: Analyzing trace with hash -868456886, now seen corresponding path program 9 times [2021-11-09 10:53:16,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:53:16,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386510060] [2021-11-09 10:53:16,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:53:16,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:53:16,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:53:22,308 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 10:53:22,308 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:53:22,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386510060] [2021-11-09 10:53:22,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386510060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:53:22,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15966133] [2021-11-09 10:53:22,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-09 10:53:22,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:53:22,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:53:22,310 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:53:22,314 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-09 10:53:23,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-09 10:53:23,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:53:23,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-09 10:53:23,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:53:23,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:53:23,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:23,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-09 10:53:24,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:24,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:24,054 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 10:53:24,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 29 [2021-11-09 10:53:24,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:53:24,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:53:24,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:24,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:24,606 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-09 10:53:24,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 27 treesize of output 45 [2021-11-09 10:53:24,949 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:53:24,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 52 [2021-11-09 10:53:24,964 INFO L354 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2021-11-09 10:53:24,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 65 [2021-11-09 10:53:25,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:25,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:25,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:25,215 INFO L354 Elim1Store]: treesize reduction 66, result has 35.3 percent of original size [2021-11-09 10:53:25,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 61 [2021-11-09 10:53:25,814 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-09 10:53:25,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 109 treesize of output 90 [2021-11-09 10:53:25,852 INFO L354 Elim1Store]: treesize reduction 88, result has 23.5 percent of original size [2021-11-09 10:53:25,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 150 treesize of output 152 [2021-11-09 10:53:26,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:26,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:26,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:26,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:26,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:53:26,266 INFO L354 Elim1Store]: treesize reduction 16, result has 64.4 percent of original size [2021-11-09 10:53:26,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 11 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 4 case distinctions, treesize of input 43 treesize of output 47 [2021-11-09 10:53:26,715 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-09 10:53:26,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 173 treesize of output 116 [2021-11-09 10:53:26,755 INFO L354 Elim1Store]: treesize reduction 192, result has 19.3 percent of original size [2021-11-09 10:53:26,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 230 treesize of output 235 [2021-11-09 10:53:27,653 INFO L354 Elim1Store]: treesize reduction 112, result has 20.6 percent of original size [2021-11-09 10:53:27,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 243 treesize of output 144 [2021-11-09 10:53:27,707 INFO L354 Elim1Store]: treesize reduction 352, result has 16.4 percent of original size [2021-11-09 10:53:27,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 312 treesize of output 324 [2021-11-09 10:53:28,089 INFO L354 Elim1Store]: treesize reduction 424, result has 14.0 percent of original size [2021-11-09 10:53:28,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 18 case distinctions, treesize of input 334 treesize of output 341 [2021-11-09 10:53:28,140 INFO L354 Elim1Store]: treesize reduction 144, result has 16.8 percent of original size [2021-11-09 10:53:28,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 18 case distinctions, treesize of input 323 treesize of output 150 [2021-11-09 10:53:28,565 INFO L354 Elim1Store]: treesize reduction 160, result has 18.4 percent of original size [2021-11-09 10:53:28,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 10 new quantified variables, introduced 20 case distinctions, treesize of input 339 treesize of output 173 [2021-11-09 10:53:28,657 INFO L354 Elim1Store]: treesize reduction 580, result has 14.2 percent of original size [2021-11-09 10:53:28,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 20 case distinctions, treesize of input 436 treesize of output 450 [2021-11-09 10:53:32,879 INFO L354 Elim1Store]: treesize reduction 667, result has 7.2 percent of original size [2021-11-09 10:53:32,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 1 disjoint index pairs (out of 66 index pairs), introduced 25 new quantified variables, introduced 66 case distinctions, treesize of input 950 treesize of output 278 [2021-11-09 10:53:33,067 INFO L354 Elim1Store]: treesize reduction 621, result has 2.5 percent of original size [2021-11-09 10:53:33,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 1 disjoint index pairs (out of 66 index pairs), introduced 17 new quantified variables, introduced 66 case distinctions, treesize of input 154 treesize of output 132 [2021-11-09 10:53:33,165 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 10 proven. 50 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 10:53:33,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15966133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:53:33,166 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:53:33,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23] total 45 [2021-11-09 10:53:33,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820253598] [2021-11-09 10:53:33,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-09 10:53:33,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:53:33,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-09 10:53:33,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1837, Unknown=0, NotChecked=0, Total=1980 [2021-11-09 10:53:33,169 INFO L87 Difference]: Start difference. First operand 285 states and 345 transitions. Second operand has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:54:48,000 WARN L207 SmtUtils]: Spent 6.85 s on a formula simplification. DAG size of input: 432 DAG size of output: 404 [2021-11-09 10:56:47,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:56:47,783 INFO L93 Difference]: Finished difference Result 436 states and 519 transitions. [2021-11-09 10:56:47,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-09 10:56:47,784 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-09 10:56:47,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:56:47,786 INFO L225 Difference]: With dead ends: 436 [2021-11-09 10:56:47,786 INFO L226 Difference]: Without dead ends: 408 [2021-11-09 10:56:47,788 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 92.5s TimeCoverageRelationStatistics Valid=627, Invalid=4319, Unknown=24, NotChecked=0, Total=4970 [2021-11-09 10:56:47,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2021-11-09 10:56:47,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 358. [2021-11-09 10:56:47,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 358 states, 357 states have (on average 1.2128851540616246) internal successors, (433), 357 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:56:47,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 433 transitions. [2021-11-09 10:56:47,957 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 433 transitions. Word has length 58 [2021-11-09 10:56:47,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:56:47,958 INFO L470 AbstractCegarLoop]: Abstraction has 358 states and 433 transitions. [2021-11-09 10:56:47,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 45 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:56:47,958 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 433 transitions. [2021-11-09 10:56:47,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-09 10:56:47,959 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:56:47,960 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 3, 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] [2021-11-09 10:56:47,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-09 10:56:48,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-09 10:56:48,161 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 10:56:48,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:56:48,161 INFO L85 PathProgramCache]: Analyzing trace with hash -1824783146, now seen corresponding path program 10 times [2021-11-09 10:56:48,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:56:48,161 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705873373] [2021-11-09 10:56:48,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:56:48,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:56:48,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:56:53,456 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 3 proven. 67 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-09 10:56:53,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:56:53,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705873373] [2021-11-09 10:56:53,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705873373] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:56:53,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676903644] [2021-11-09 10:56:53,457 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-09 10:56:53,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:56:53,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:56:53,458 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:56:53,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-09 10:56:54,977 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-09 10:56:54,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 10:56:54,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-09 10:56:54,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:56:55,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-09 10:56:55,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:56:55,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-09 10:56:55,775 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 10:56:55,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-11-09 10:56:56,048 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 10:56:56,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 48 [2021-11-09 10:56:56,063 INFO L354 Elim1Store]: treesize reduction 29, result has 27.5 percent of original size [2021-11-09 10:56:56,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 57 [2021-11-09 10:56:56,312 INFO L354 Elim1Store]: treesize reduction 48, result has 36.0 percent of original size [2021-11-09 10:56:56,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 41 [2021-11-09 10:56:56,716 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-09 10:56:56,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 96 treesize of output 81 [2021-11-09 10:56:56,740 INFO L354 Elim1Store]: treesize reduction 88, result has 23.5 percent of original size [2021-11-09 10:56:56,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 129 treesize of output 131 [2021-11-09 10:56:57,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:56:57,088 INFO L354 Elim1Store]: treesize reduction 90, result has 36.6 percent of original size [2021-11-09 10:56:57,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 69 [2021-11-09 10:56:57,612 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-09 10:56:57,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 171 treesize of output 114 [2021-11-09 10:56:57,655 INFO L354 Elim1Store]: treesize reduction 192, result has 19.3 percent of original size [2021-11-09 10:56:57,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 228 treesize of output 233 [2021-11-09 10:56:58,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:56:58,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:56:58,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:56:58,152 INFO L354 Elim1Store]: treesize reduction 16, result has 71.9 percent of original size [2021-11-09 10:56:58,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 50 treesize of output 56 [2021-11-09 10:56:58,662 INFO L354 Elim1Store]: treesize reduction 112, result has 20.6 percent of original size [2021-11-09 10:56:58,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 238 treesize of output 135 [2021-11-09 10:56:58,716 INFO L354 Elim1Store]: treesize reduction 352, result has 16.4 percent of original size [2021-11-09 10:56:58,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 303 treesize of output 311 [2021-11-09 10:56:59,765 INFO L354 Elim1Store]: treesize reduction 120, result has 38.8 percent of original size [2021-11-09 10:56:59,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 9 new quantified variables, introduced 15 case distinctions, treesize of input 296 treesize of output 195 [2021-11-09 10:56:59,858 INFO L354 Elim1Store]: treesize reduction 188, result has 17.5 percent of original size [2021-11-09 10:56:59,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 205 treesize of output 220 [2021-11-09 10:57:04,200 INFO L354 Elim1Store]: treesize reduction 200, result has 15.3 percent of original size [2021-11-09 10:57:04,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 25 case distinctions, treesize of input 227 treesize of output 212 [2021-11-09 10:57:04,299 INFO L354 Elim1Store]: treesize reduction 232, result has 14.7 percent of original size [2021-11-09 10:57:04,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 25 case distinctions, treesize of input 216 treesize of output 226 [2021-11-09 10:57:08,344 INFO L354 Elim1Store]: treesize reduction 216, result has 16.6 percent of original size [2021-11-09 10:57:08,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 27 case distinctions, treesize of input 232 treesize of output 224 [2021-11-09 10:57:08,455 INFO L354 Elim1Store]: treesize reduction 312, result has 15.0 percent of original size [2021-11-09 10:57:08,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 27 case distinctions, treesize of input 285 treesize of output 302 [2021-11-09 10:58:48,953 INFO L354 Elim1Store]: treesize reduction 1678, result has 1.1 percent of original size [2021-11-09 10:58:48,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 1 disjoint index pairs (out of 91 index pairs), introduced 25 new quantified variables, introduced 91 case distinctions, treesize of input 2287 treesize of output 492 [2021-11-09 10:58:49,375 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 6 proven. 64 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-09 10:58:49,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676903644] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:58:49,376 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:58:49,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 51 [2021-11-09 10:58:49,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188230817] [2021-11-09 10:58:49,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-09 10:58:49,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:58:49,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-09 10:58:49,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2395, Unknown=0, NotChecked=0, Total=2550 [2021-11-09 10:58:49,379 INFO L87 Difference]: Start difference. First operand 358 states and 433 transitions. Second operand has 51 states, 51 states have (on average 1.9411764705882353) internal successors, (99), 51 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 10:59:33,141 WARN L207 SmtUtils]: Spent 5.89 s on a formula simplification. DAG size of input: 378 DAG size of output: 305 [2021-11-09 11:00:01,179 WARN L207 SmtUtils]: Spent 17.23 s on a formula simplification. DAG size of input: 460 DAG size of output: 424 [2021-11-09 11:01:06,372 WARN L207 SmtUtils]: Spent 45.63 s on a formula simplification. DAG size of input: 504 DAG size of output: 468 [2021-11-09 11:02:52,931 WARN L207 SmtUtils]: Spent 1.53 m on a formula simplification. DAG size of input: 513 DAG size of output: 477 [2021-11-09 11:03:23,043 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-09 11:03:23,049 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 101 [2021-11-09 11:03:23,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-09 11:03:23,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 11:03:23,248 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:158) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.pop(Scriptor.java:139) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.pop(DiffWrapperScript.java:99) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.pop(WrapperScript.java:153) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.pop(HistoryRecordingScript.java:117) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.pop(ManagedScript.java:129) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.unAssertPostcondition(IncrementalHoareTripleChecker.java:662) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.clearAssertionStack(IncrementalHoareTripleChecker.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.releaseLock(IncrementalHoareTripleChecker.java:281) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ProtectiveHoareTripleChecker.releaseLock(ProtectiveHoareTripleChecker.java:93) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.EfficientHoareTripleChecker.releaseLock(EfficientHoareTripleChecker.java:162) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.releaseLock(CachingHoareTripleChecker.java:201) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.switchToReadonlyMode(AbstractInterpolantAutomaton.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:886) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:783) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Broken pipe at java.base/java.io.FileOutputStream.writeBytes(Native Method) at java.base/java.io.FileOutputStream.write(FileOutputStream.java:354) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:156) ... 35 more [2021-11-09 11:03:23,254 INFO L168 Benchmark]: Toolchain (without parser) took 772735.07 ms. Allocated memory was 90.2 MB in the beginning and 415.2 MB in the end (delta: 325.1 MB). Free memory was 57.7 MB in the beginning and 180.7 MB in the end (delta: -123.0 MB). Peak memory consumption was 200.6 MB. Max. memory is 16.1 GB. [2021-11-09 11:03:23,254 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 90.2 MB. Free memory is still 48.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-09 11:03:23,255 INFO L168 Benchmark]: CACSL2BoogieTranslator took 688.83 ms. Allocated memory is still 90.2 MB. Free memory was 57.5 MB in the beginning and 60.2 MB in the end (delta: -2.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-09 11:03:23,255 INFO L168 Benchmark]: Boogie Procedure Inliner took 68.72 ms. Allocated memory is still 90.2 MB. Free memory was 60.2 MB in the beginning and 57.8 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-09 11:03:23,255 INFO L168 Benchmark]: Boogie Preprocessor took 70.27 ms. Allocated memory is still 90.2 MB. Free memory was 57.8 MB in the beginning and 56.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-09 11:03:23,255 INFO L168 Benchmark]: RCFGBuilder took 617.01 ms. Allocated memory is still 90.2 MB. Free memory was 56.1 MB in the beginning and 40.7 MB in the end (delta: 15.4 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-11-09 11:03:23,256 INFO L168 Benchmark]: TraceAbstraction took 771282.88 ms. Allocated memory was 90.2 MB in the beginning and 415.2 MB in the end (delta: 325.1 MB). Free memory was 40.0 MB in the beginning and 180.7 MB in the end (delta: -140.7 MB). Peak memory consumption was 186.4 MB. Max. memory is 16.1 GB. [2021-11-09 11:03:23,257 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 90.2 MB. Free memory is still 48.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 688.83 ms. Allocated memory is still 90.2 MB. Free memory was 57.5 MB in the beginning and 60.2 MB in the end (delta: -2.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 68.72 ms. Allocated memory is still 90.2 MB. Free memory was 60.2 MB in the beginning and 57.8 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 70.27 ms. Allocated memory is still 90.2 MB. Free memory was 57.8 MB in the beginning and 56.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 617.01 ms. Allocated memory is still 90.2 MB. Free memory was 56.1 MB in the beginning and 40.7 MB in the end (delta: 15.4 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 771282.88 ms. Allocated memory was 90.2 MB in the beginning and 415.2 MB in the end (delta: 325.1 MB). Free memory was 40.0 MB in the beginning and 180.7 MB in the end (delta: -140.7 MB). Peak memory consumption was 186.4 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken: de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX --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 fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 11:03:26,258 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 11:03:26,261 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 11:03:26,307 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 11:03:26,308 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 11:03:26,310 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 11:03:26,312 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 11:03:26,316 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 11:03:26,319 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 11:03:26,321 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 11:03:26,323 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 11:03:26,325 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 11:03:26,326 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 11:03:26,328 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 11:03:26,331 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 11:03:26,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 11:03:26,335 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 11:03:26,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 11:03:26,352 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 11:03:26,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 11:03:26,359 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 11:03:26,372 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 11:03:26,376 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 11:03:26,378 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 11:03:26,388 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 11:03:26,394 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 11:03:26,395 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 11:03:26,396 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 11:03:26,402 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 11:03:26,404 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 11:03:26,406 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 11:03:26,407 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 11:03:26,409 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 11:03:26,411 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 11:03:26,414 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 11:03:26,415 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 11:03:26,416 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 11:03:26,416 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 11:03:26,417 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 11:03:26,419 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 11:03:26,421 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 11:03:26,422 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2021-11-09 11:03:26,488 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 11:03:26,488 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 11:03:26,489 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 11:03:26,489 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 11:03:26,491 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 11:03:26,491 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 11:03:26,492 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 11:03:26,492 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 11:03:26,492 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 11:03:26,492 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 11:03:26,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 11:03:26,497 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-09 11:03:26,497 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 11:03:26,498 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-09 11:03:26,498 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-09 11:03:26,498 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-09 11:03:26,499 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 11:03:26,499 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-09 11:03:26,499 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 11:03:26,500 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-09 11:03:26,500 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 11:03:26,501 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 11:03:26,501 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 11:03:26,502 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 11:03:26,502 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 11:03:26,503 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 11:03:26,503 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-09 11:03:26,503 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-11-09 11:03:26,504 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-09 11:03:26,504 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-11-09 11:03:26,504 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-11-09 11:03:26,505 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-09 11:03:26,505 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 11:03:26,506 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-09 11:03:26,506 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 [2021-11-09 11:03:27,085 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 11:03:27,112 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 11:03:27,123 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 11:03:27,125 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 11:03:27,126 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 11:03:27,128 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2021-11-09 11:03:27,246 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/49ef54f7a/c284245d9cba433eb50d601cbf466d9f/FLAGac2eec51b [2021-11-09 11:03:27,969 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 11:03:27,970 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2021-11-09 11:03:27,992 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/49ef54f7a/c284245d9cba433eb50d601cbf466d9f/FLAGac2eec51b [2021-11-09 11:03:28,207 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/data/49ef54f7a/c284245d9cba433eb50d601cbf466d9f [2021-11-09 11:03:28,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 11:03:28,227 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-09 11:03:28,232 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 11:03:28,232 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 11:03:28,238 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 11:03:28,240 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 11:03:28" (1/1) ... [2021-11-09 11:03:28,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cd7fd07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:28, skipping insertion in model container [2021-11-09 11:03:28,245 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 11:03:28" (1/1) ... [2021-11-09 11:03:28,255 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 11:03:28,337 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 11:03:28,892 WARN L228 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_1b18acee-b5d4-441e-81a1-240965b77fa0/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i[24987,25000] [2021-11-09 11:03:28,904 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 11:03:28,936 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 11:03:29,035 WARN L228 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_1b18acee-b5d4-441e-81a1-240965b77fa0/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i[24987,25000] [2021-11-09 11:03:29,037 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 11:03:29,120 INFO L208 MainTranslator]: Completed translation [2021-11-09 11:03:29,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29 WrapperNode [2021-11-09 11:03:29,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 11:03:29,122 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-09 11:03:29,123 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-09 11:03:29,123 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-09 11:03:29,131 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,158 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,196 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-09 11:03:29,197 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 11:03:29,198 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 11:03:29,198 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 11:03:29,209 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,210 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,217 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,217 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,233 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,241 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,246 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,254 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 11:03:29,255 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 11:03:29,255 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 11:03:29,256 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 11:03:29,257 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (1/1) ... [2021-11-09 11:03:29,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 11:03:29,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 11:03:29,298 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 11:03:29,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 11:03:29,378 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-09 11:03:29,378 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-09 11:03:29,378 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-09 11:03:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-09 11:03:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-09 11:03:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-09 11:03:29,379 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-09 11:03:29,380 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 11:03:29,382 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 11:03:30,232 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 11:03:30,232 INFO L299 CfgBuilder]: Removed 27 assume(true) statements. [2021-11-09 11:03:30,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 11:03:30 BoogieIcfgContainer [2021-11-09 11:03:30,236 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 11:03:30,239 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 11:03:30,239 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 11:03:30,242 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 11:03:30,242 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 11:03:28" (1/3) ... [2021-11-09 11:03:30,243 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30f1c31d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 11:03:30, skipping insertion in model container [2021-11-09 11:03:30,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 11:03:29" (2/3) ... [2021-11-09 11:03:30,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30f1c31d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 11:03:30, skipping insertion in model container [2021-11-09 11:03:30,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 11:03:30" (3/3) ... [2021-11-09 11:03:30,247 INFO L111 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2021-11-09 11:03:30,255 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 11:03:30,256 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-09 11:03:30,329 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 11:03:30,338 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-09 11:03:30,339 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-09 11:03:30,360 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 40 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:30,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-09 11:03:30,367 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:30,368 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:30,369 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 11:03:30,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 11:03:30,377 INFO L85 PathProgramCache]: Analyzing trace with hash 1809958427, now seen corresponding path program 1 times [2021-11-09 11:03:30,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-09 11:03:30,395 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [972866429] [2021-11-09 11:03:30,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 11:03:30,397 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-09 11:03:30,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat [2021-11-09 11:03:30,401 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-09 11:03:30,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-09 11:03:30,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 11:03:30,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-09 11:03:30,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 11:03:30,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 11:03:30,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-09 11:03:30,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 11:03:30,795 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-09 11:03:30,796 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [972866429] [2021-11-09 11:03:30,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [972866429] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-09 11:03:30,797 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-09 11:03:30,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-09 11:03:30,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19859248] [2021-11-09 11:03:30,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 11:03:30,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-09 11:03:30,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 11:03:30,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-09 11:03:30,836 INFO L87 Difference]: Start difference. First operand has 41 states, 39 states have (on average 1.6666666666666667) internal successors, (65), 40 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:31,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 11:03:31,018 INFO L93 Difference]: Finished difference Result 102 states and 163 transitions. [2021-11-09 11:03:31,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 11:03:31,022 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-09 11:03:31,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 11:03:31,034 INFO L225 Difference]: With dead ends: 102 [2021-11-09 11:03:31,035 INFO L226 Difference]: Without dead ends: 51 [2021-11-09 11:03:31,039 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-09 11:03:31,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-09 11:03:31,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2021-11-09 11:03:31,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 47 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:31,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 62 transitions. [2021-11-09 11:03:31,093 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 62 transitions. Word has length 7 [2021-11-09 11:03:31,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 11:03:31,094 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 62 transitions. [2021-11-09 11:03:31,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:31,095 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 62 transitions. [2021-11-09 11:03:31,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-09 11:03:31,096 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:31,097 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:31,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-09 11:03:31,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 [2021-11-09 11:03:31,316 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 11:03:31,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 11:03:31,318 INFO L85 PathProgramCache]: Analyzing trace with hash -2138568261, now seen corresponding path program 1 times [2021-11-09 11:03:31,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-09 11:03:31,320 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1906152131] [2021-11-09 11:03:31,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 11:03:31,321 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-09 11:03:31,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat [2021-11-09 11:03:31,327 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-09 11:03:31,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-09 11:03:31,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 11:03:31,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-09 11:03:31,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 11:03:31,808 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 11:03:31,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-09 11:03:32,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 11:03:32,014 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-09 11:03:32,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1906152131] [2021-11-09 11:03:32,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1906152131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-09 11:03:32,015 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 11:03:32,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-11-09 11:03:32,016 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209620827] [2021-11-09 11:03:32,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 11:03:32,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-09 11:03:32,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 11:03:32,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-09 11:03:32,024 INFO L87 Difference]: Start difference. First operand 48 states and 62 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:32,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 11:03:32,424 INFO L93 Difference]: Finished difference Result 98 states and 126 transitions. [2021-11-09 11:03:32,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 11:03:32,425 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-09 11:03:32,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 11:03:32,428 INFO L225 Difference]: With dead ends: 98 [2021-11-09 11:03:32,428 INFO L226 Difference]: Without dead ends: 85 [2021-11-09 11:03:32,434 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2021-11-09 11:03:32,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-09 11:03:32,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2021-11-09 11:03:32,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2878787878787878) internal successors, (85), 66 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:32,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2021-11-09 11:03:32,470 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 13 [2021-11-09 11:03:32,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 11:03:32,472 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2021-11-09 11:03:32,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:32,473 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2021-11-09 11:03:32,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-09 11:03:32,478 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:32,478 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:32,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-09 11:03:32,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 [2021-11-09 11:03:32,697 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 11:03:32,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 11:03:32,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1628394054, now seen corresponding path program 2 times [2021-11-09 11:03:32,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-09 11:03:32,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [930225802] [2021-11-09 11:03:32,700 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 11:03:32,700 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-09 11:03:32,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat [2021-11-09 11:03:32,712 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-09 11:03:32,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-09 11:03:32,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-09 11:03:32,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 11:03:32,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-09 11:03:32,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 11:03:33,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-09 11:03:33,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2021-11-09 11:03:33,212 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 11:03:33,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-09 11:03:33,425 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 11:03:33,425 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-09 11:03:33,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [930225802] [2021-11-09 11:03:33,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [930225802] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-09 11:03:33,427 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-09 11:03:33,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-09 11:03:33,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86338167] [2021-11-09 11:03:33,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 11:03:33,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-09 11:03:33,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 11:03:33,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 11:03:33,443 INFO L87 Difference]: Start difference. First operand 67 states and 85 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:33,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 11:03:33,668 INFO L93 Difference]: Finished difference Result 116 states and 146 transitions. [2021-11-09 11:03:33,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 11:03:33,670 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-09 11:03:33,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 11:03:33,673 INFO L225 Difference]: With dead ends: 116 [2021-11-09 11:03:33,673 INFO L226 Difference]: Without dead ends: 97 [2021-11-09 11:03:33,674 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-09 11:03:33,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-09 11:03:33,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 74. [2021-11-09 11:03:33,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 73 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:33,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 94 transitions. [2021-11-09 11:03:33,709 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 94 transitions. Word has length 16 [2021-11-09 11:03:33,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 11:03:33,710 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 94 transitions. [2021-11-09 11:03:33,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:33,711 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 94 transitions. [2021-11-09 11:03:33,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-09 11:03:33,714 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:33,715 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:33,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-09 11:03:33,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 [2021-11-09 11:03:33,938 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 11:03:33,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 11:03:33,939 INFO L85 PathProgramCache]: Analyzing trace with hash -936050399, now seen corresponding path program 1 times [2021-11-09 11:03:33,940 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-09 11:03:33,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1639415084] [2021-11-09 11:03:33,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 11:03:33,942 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-09 11:03:33,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat [2021-11-09 11:03:33,943 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-09 11:03:33,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-09 11:03:34,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 11:03:34,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-09 11:03:34,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 11:03:34,293 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 11:03:34,293 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-09 11:03:34,516 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 11:03:34,517 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-09 11:03:34,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1639415084] [2021-11-09 11:03:34,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1639415084] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-09 11:03:34,517 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 11:03:34,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-09 11:03:34,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244646263] [2021-11-09 11:03:34,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 11:03:34,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-09 11:03:34,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 11:03:34,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-09 11:03:34,520 INFO L87 Difference]: Start difference. First operand 74 states and 94 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:36,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 11:03:36,493 INFO L93 Difference]: Finished difference Result 419 states and 544 transitions. [2021-11-09 11:03:36,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-09 11:03:36,495 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-09 11:03:36,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 11:03:36,501 INFO L225 Difference]: With dead ends: 419 [2021-11-09 11:03:36,502 INFO L226 Difference]: Without dead ends: 355 [2021-11-09 11:03:36,504 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=279, Invalid=713, Unknown=0, NotChecked=0, Total=992 [2021-11-09 11:03:36,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2021-11-09 11:03:36,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 165. [2021-11-09 11:03:36,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.2865853658536586) internal successors, (211), 164 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:36,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 211 transitions. [2021-11-09 11:03:36,549 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 211 transitions. Word has length 25 [2021-11-09 11:03:36,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 11:03:36,549 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 211 transitions. [2021-11-09 11:03:36,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:36,550 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 211 transitions. [2021-11-09 11:03:36,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-09 11:03:36,553 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:36,553 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:36,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-09 11:03:36,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 [2021-11-09 11:03:36,775 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 11:03:36,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 11:03:36,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1795097602, now seen corresponding path program 1 times [2021-11-09 11:03:36,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-09 11:03:36,777 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1717697893] [2021-11-09 11:03:36,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 11:03:36,778 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-09 11:03:36,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat [2021-11-09 11:03:36,779 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-09 11:03:36,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-09 11:03:36,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 11:03:36,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-09 11:03:36,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 11:03:37,157 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 11:03:37,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-09 11:03:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 11:03:37,426 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-09 11:03:37,426 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1717697893] [2021-11-09 11:03:37,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1717697893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-09 11:03:37,427 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 11:03:37,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-11-09 11:03:37,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857209470] [2021-11-09 11:03:37,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-09 11:03:37,428 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-09 11:03:37,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-09 11:03:37,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-09 11:03:37,430 INFO L87 Difference]: Start difference. First operand 165 states and 211 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 12 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:39,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 11:03:39,426 INFO L93 Difference]: Finished difference Result 444 states and 572 transitions. [2021-11-09 11:03:39,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-09 11:03:39,428 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 12 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-09 11:03:39,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 11:03:39,431 INFO L225 Difference]: With dead ends: 444 [2021-11-09 11:03:39,432 INFO L226 Difference]: Without dead ends: 301 [2021-11-09 11:03:39,434 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=286, Invalid=770, Unknown=0, NotChecked=0, Total=1056 [2021-11-09 11:03:39,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-11-09 11:03:39,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 180. [2021-11-09 11:03:39,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 179 states have (on average 1.2625698324022345) internal successors, (226), 179 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:39,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 226 transitions. [2021-11-09 11:03:39,472 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 226 transitions. Word has length 28 [2021-11-09 11:03:39,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 11:03:39,473 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 226 transitions. [2021-11-09 11:03:39,473 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 12 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:39,474 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 226 transitions. [2021-11-09 11:03:39,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-09 11:03:39,477 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:39,477 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:39,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-09 11:03:39,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 [2021-11-09 11:03:39,701 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-09 11:03:39,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 11:03:39,701 INFO L85 PathProgramCache]: Analyzing trace with hash 1139729665, now seen corresponding path program 2 times [2021-11-09 11:03:39,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-09 11:03:39,702 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1430767502] [2021-11-09 11:03:39,703 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-09 11:03:39,703 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-09 11:03:39,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat [2021-11-09 11:03:39,705 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-09 11:03:39,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-09 11:03:39,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-09 11:03:39,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-09 11:03:39,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-09 11:03:39,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 11:03:40,230 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 11:03:40,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-09 11:03:40,434 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-09 11:03:40,434 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-09 11:03:40,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1430767502] [2021-11-09 11:03:40,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1430767502] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-09 11:03:40,435 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-09 11:03:40,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-09 11:03:40,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189998554] [2021-11-09 11:03:40,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 11:03:40,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-09 11:03:40,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 11:03:40,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-09 11:03:40,437 INFO L87 Difference]: Start difference. First operand 180 states and 226 transitions. Second operand has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:40,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 11:03:40,586 INFO L93 Difference]: Finished difference Result 196 states and 243 transitions. [2021-11-09 11:03:40,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-09 11:03:40,588 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-09 11:03:40,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 11:03:40,590 INFO L225 Difference]: With dead ends: 196 [2021-11-09 11:03:40,590 INFO L226 Difference]: Without dead ends: 194 [2021-11-09 11:03:40,591 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-09 11:03:40,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-09 11:03:40,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 178. [2021-11-09 11:03:40,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.2598870056497176) internal successors, (223), 177 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:40,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 223 transitions. [2021-11-09 11:03:40,634 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 223 transitions. Word has length 31 [2021-11-09 11:03:40,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 11:03:40,635 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 223 transitions. [2021-11-09 11:03:40,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.0) internal successors, (42), 6 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-09 11:03:40,635 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 223 transitions. [2021-11-09 11:03:40,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-09 11:03:40,639 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 11:03:40,639 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 11:03:40,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1b18acee-b5d4-441e-81a1-240965b77fa0/bin/uautomizer-IVEQpCNsaX/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0