./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2c_remove_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version f8e1c903 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/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_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2c_remove_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 6c2ed91303515fb47ae50633bb4ba0c83e07781b13d03a95e0e32251f9fc3016 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-f8e1c90 [2021-11-09 09:52:05,953 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-09 09:52:05,956 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-09 09:52:05,988 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-09 09:52:05,989 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-09 09:52:05,990 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-09 09:52:05,992 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-09 09:52:05,994 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-09 09:52:05,996 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-09 09:52:05,998 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-09 09:52:05,999 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-09 09:52:06,000 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-09 09:52:06,001 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-09 09:52:06,002 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-09 09:52:06,004 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-09 09:52:06,006 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-09 09:52:06,007 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-09 09:52:06,008 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-09 09:52:06,010 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-09 09:52:06,013 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-09 09:52:06,016 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-09 09:52:06,018 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-09 09:52:06,019 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-09 09:52:06,021 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-09 09:52:06,025 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-09 09:52:06,026 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-09 09:52:06,026 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-09 09:52:06,027 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-09 09:52:06,028 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-09 09:52:06,029 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-09 09:52:06,030 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-09 09:52:06,031 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-09 09:52:06,032 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-09 09:52:06,033 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-09 09:52:06,034 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-09 09:52:06,034 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-09 09:52:06,035 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-09 09:52:06,036 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-09 09:52:06,036 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-09 09:52:06,037 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-09 09:52:06,038 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-09 09:52:06,039 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-09 09:52:06,067 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-09 09:52:06,068 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-09 09:52:06,068 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-09 09:52:06,068 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-09 09:52:06,070 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-09 09:52:06,070 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-09 09:52:06,070 INFO L138 SettingsManager]: * Use SBE=true [2021-11-09 09:52:06,070 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-09 09:52:06,071 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-09 09:52:06,071 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-09 09:52:06,071 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-09 09:52:06,071 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-09 09:52:06,072 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-09 09:52:06,072 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-09 09:52:06,072 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-09 09:52:06,072 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-09 09:52:06,073 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-09 09:52:06,073 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-09 09:52:06,073 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-09 09:52:06,073 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-09 09:52:06,074 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-09 09:52:06,074 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-09 09:52:06,074 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-09 09:52:06,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:52:06,075 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-09 09:52:06,075 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-09 09:52:06,075 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-09 09:52:06,075 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-09 09:52:06,075 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-09 09:52:06,076 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_d875ab0e-75df-46b6-abc2-609df98c7719/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c2ed91303515fb47ae50633bb4ba0c83e07781b13d03a95e0e32251f9fc3016 [2021-11-09 09:52:06,372 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-09 09:52:06,399 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-09 09:52:06,402 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-09 09:52:06,403 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-09 09:52:06,405 INFO L275 PluginConnector]: CDTParser initialized [2021-11-09 09:52:06,406 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/../../sv-benchmarks/c/list-simple/dll2c_remove_all.i [2021-11-09 09:52:06,495 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/data/c3e6f0de5/934841548295436f83122df40a60ebb2/FLAGa72a1d7af [2021-11-09 09:52:07,168 INFO L306 CDTParser]: Found 1 translation units. [2021-11-09 09:52:07,169 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/sv-benchmarks/c/list-simple/dll2c_remove_all.i [2021-11-09 09:52:07,194 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/data/c3e6f0de5/934841548295436f83122df40a60ebb2/FLAGa72a1d7af [2021-11-09 09:52:07,443 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/data/c3e6f0de5/934841548295436f83122df40a60ebb2 [2021-11-09 09:52:07,447 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-09 09:52:07,450 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-09 09:52:07,454 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-09 09:52:07,455 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-09 09:52:07,459 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-09 09:52:07,461 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:52:07" (1/1) ... [2021-11-09 09:52:07,463 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76ec63af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:07, skipping insertion in model container [2021-11-09 09:52:07,464 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 09:52:07" (1/1) ... [2021-11-09 09:52:07,473 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-09 09:52:07,537 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-09 09:52:07,966 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_d875ab0e-75df-46b6-abc2-609df98c7719/sv-benchmarks/c/list-simple/dll2c_remove_all.i[24169,24182] [2021-11-09 09:52:07,969 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:52:07,978 INFO L203 MainTranslator]: Completed pre-run [2021-11-09 09:52:08,020 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_d875ab0e-75df-46b6-abc2-609df98c7719/sv-benchmarks/c/list-simple/dll2c_remove_all.i[24169,24182] [2021-11-09 09:52:08,021 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-09 09:52:08,054 INFO L208 MainTranslator]: Completed translation [2021-11-09 09:52:08,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08 WrapperNode [2021-11-09 09:52:08,055 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-09 09:52:08,056 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-09 09:52:08,056 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-09 09:52:08,056 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-09 09:52:08,068 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,069 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,085 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,085 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,103 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,107 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,112 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,118 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-09 09:52:08,119 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-09 09:52:08,119 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-09 09:52:08,119 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-09 09:52:08,120 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (1/1) ... [2021-11-09 09:52:08,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-09 09:52:08,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:08,176 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-09 09:52:08,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-09 09:52:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-09 09:52:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-09 09:52:08,224 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-09 09:52:08,224 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-09 09:52:08,224 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-09 09:52:08,225 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-11-09 09:52:08,225 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-11-09 09:52:08,226 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_create [2021-11-09 09:52:08,226 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_circular_remove_first [2021-11-09 09:52:08,227 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-09 09:52:08,227 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-09 09:52:08,227 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-09 09:52:08,227 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-09 09:52:08,227 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-09 09:52:08,227 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-09 09:52:08,228 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-09 09:52:08,228 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-09 09:52:08,228 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-09 09:52:08,228 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-09 09:52:08,228 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-09 09:52:08,228 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-09 09:52:08,229 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-09 09:52:08,230 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-09 09:52:08,230 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-09 09:52:08,230 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-09 09:52:08,230 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-09 09:52:08,230 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-09 09:52:08,230 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-09 09:52:08,231 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-09 09:52:08,232 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-09 09:52:08,232 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-09 09:52:08,232 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-09 09:52:08,232 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-09 09:52:08,233 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-09 09:52:08,233 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-09 09:52:08,233 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-09 09:52:08,233 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-09 09:52:08,234 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-09 09:52:08,234 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-09 09:52:08,234 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-09 09:52:08,234 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-09 09:52:08,235 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-09 09:52:08,235 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-09 09:52:08,235 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-09 09:52:08,235 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-09 09:52:08,235 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-09 09:52:08,236 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-09 09:52:08,236 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-09 09:52:08,236 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-09 09:52:08,236 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-09 09:52:08,237 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-09 09:52:08,237 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-09 09:52:08,237 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-09 09:52:08,237 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-09 09:52:08,239 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-09 09:52:08,239 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-09 09:52:08,239 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-09 09:52:08,240 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-09 09:52:08,240 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-09 09:52:08,240 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-09 09:52:08,240 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-11-09 09:52:08,240 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-09 09:52:08,240 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-09 09:52:08,241 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-09 09:52:08,241 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-09 09:52:08,241 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-09 09:52:08,241 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-09 09:52:08,242 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-09 09:52:08,242 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-09 09:52:08,242 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-09 09:52:08,242 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-09 09:52:08,243 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-09 09:52:08,244 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-09 09:52:08,245 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-09 09:52:08,245 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-09 09:52:08,245 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-09 09:52:08,245 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-09 09:52:08,245 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-09 09:52:08,245 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-09 09:52:08,246 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-09 09:52:08,246 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-09 09:52:08,246 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-09 09:52:08,246 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-09 09:52:08,247 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-09 09:52:08,247 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-09 09:52:08,247 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-09 09:52:08,248 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-09 09:52:08,248 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-09 09:52:08,248 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-09 09:52:08,248 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-09 09:52:08,248 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-09 09:52:08,248 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-09 09:52:08,249 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-09 09:52:08,249 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-09 09:52:08,249 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-09 09:52:08,249 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-11-09 09:52:08,249 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-11-09 09:52:08,249 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-09 09:52:08,250 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-09 09:52:08,250 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-09 09:52:08,250 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_create [2021-11-09 09:52:08,251 INFO L130 BoogieDeclarations]: Found specification of procedure dll_circular_remove_first [2021-11-09 09:52:08,251 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-09 09:52:08,254 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-09 09:52:08,255 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-09 09:52:08,255 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-09 09:52:08,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-09 09:52:08,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-09 09:52:08,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-09 09:52:08,258 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-09 09:52:08,763 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-11-09 09:52:09,019 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-09 09:52:09,020 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-09 09:52:09,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:52:09 BoogieIcfgContainer [2021-11-09 09:52:09,023 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-09 09:52:09,025 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-09 09:52:09,025 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-09 09:52:09,030 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-09 09:52:09,030 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 09:52:07" (1/3) ... [2021-11-09 09:52:09,031 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@638b0b5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:52:09, skipping insertion in model container [2021-11-09 09:52:09,032 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 09:52:08" (2/3) ... [2021-11-09 09:52:09,032 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@638b0b5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 09:52:09, skipping insertion in model container [2021-11-09 09:52:09,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:52:09" (3/3) ... [2021-11-09 09:52:09,056 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2c_remove_all.i [2021-11-09 09:52:09,063 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-09 09:52:09,064 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 46 error locations. [2021-11-09 09:52:09,124 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-09 09:52:09,131 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 09:52:09,132 INFO L340 AbstractCegarLoop]: Starting to check reachability of 46 error locations. [2021-11-09 09:52:09,153 INFO L276 IsEmpty]: Start isEmpty. Operand has 113 states, 54 states have (on average 2.0) internal successors, (108), 100 states have internal predecessors, (108), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:09,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:52:09,163 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:09,163 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:09,164 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:09,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:09,171 INFO L85 PathProgramCache]: Analyzing trace with hash 474032848, now seen corresponding path program 1 times [2021-11-09 09:52:09,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:09,182 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561608744] [2021-11-09 09:52:09,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:09,184 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:09,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:09,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:09,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:09,440 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 09:52:09,440 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:09,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561608744] [2021-11-09 09:52:09,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561608744] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:09,442 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:09,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:52:09,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729298660] [2021-11-09 09:52:09,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:52:09,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:09,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:52:09,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:52:09,472 INFO L87 Difference]: Start difference. First operand has 113 states, 54 states have (on average 2.0) internal successors, (108), 100 states have internal predecessors, (108), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-09 09:52:09,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:09,784 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2021-11-09 09:52:09,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:52:09,786 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-09 09:52:09,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:09,797 INFO L225 Difference]: With dead ends: 110 [2021-11-09 09:52:09,797 INFO L226 Difference]: Without dead ends: 104 [2021-11-09 09:52:09,799 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:52:09,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-11-09 09:52:09,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2021-11-09 09:52:09,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 51 states have (on average 1.9019607843137254) internal successors, (97), 93 states have internal predecessors, (97), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-09 09:52:09,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2021-11-09 09:52:09,851 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 12 [2021-11-09 09:52:09,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:09,852 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2021-11-09 09:52:09,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-09 09:52:09,852 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2021-11-09 09:52:09,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-09 09:52:09,853 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:09,853 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:09,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-09 09:52:09,854 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:09,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:09,855 INFO L85 PathProgramCache]: Analyzing trace with hash 474032849, now seen corresponding path program 1 times [2021-11-09 09:52:09,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:09,856 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251542258] [2021-11-09 09:52:09,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:09,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:09,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:09,955 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:09,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:09,991 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 09:52:09,991 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:09,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251542258] [2021-11-09 09:52:09,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251542258] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:09,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:09,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-09 09:52:09,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983466412] [2021-11-09 09:52:09,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-09 09:52:09,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:09,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-09 09:52:09,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:52:09,996 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-09 09:52:10,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:10,231 INFO L93 Difference]: Finished difference Result 101 states and 105 transitions. [2021-11-09 09:52:10,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-09 09:52:10,231 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-09 09:52:10,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:10,237 INFO L225 Difference]: With dead ends: 101 [2021-11-09 09:52:10,237 INFO L226 Difference]: Without dead ends: 101 [2021-11-09 09:52:10,239 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-09 09:52:10,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-09 09:52:10,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-11-09 09:52:10,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 51 states have (on average 1.8431372549019607) internal successors, (94), 90 states have internal predecessors, (94), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-09 09:52:10,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 105 transitions. [2021-11-09 09:52:10,280 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 105 transitions. Word has length 12 [2021-11-09 09:52:10,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:10,281 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 105 transitions. [2021-11-09 09:52:10,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-09 09:52:10,281 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 105 transitions. [2021-11-09 09:52:10,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-09 09:52:10,282 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:10,283 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:10,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-09 09:52:10,283 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:10,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:10,284 INFO L85 PathProgramCache]: Analyzing trace with hash 376785391, now seen corresponding path program 1 times [2021-11-09 09:52:10,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:10,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941773554] [2021-11-09 09:52:10,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:10,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:10,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:10,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:10,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:10,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:10,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:10,534 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 09:52:10,535 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:10,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941773554] [2021-11-09 09:52:10,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941773554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:10,535 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:10,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:52:10,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249249067] [2021-11-09 09:52:10,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:52:10,537 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:10,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:52:10,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:52:10,538 INFO L87 Difference]: Start difference. First operand 101 states and 105 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-09 09:52:11,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:11,036 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2021-11-09 09:52:11,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:52:11,038 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-09 09:52:11,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:11,039 INFO L225 Difference]: With dead ends: 112 [2021-11-09 09:52:11,040 INFO L226 Difference]: Without dead ends: 112 [2021-11-09 09:52:11,040 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:52:11,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-09 09:52:11,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 102. [2021-11-09 09:52:11,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 52 states have (on average 1.8269230769230769) internal successors, (95), 91 states have internal predecessors, (95), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-09 09:52:11,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 106 transitions. [2021-11-09 09:52:11,051 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 106 transitions. Word has length 20 [2021-11-09 09:52:11,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:11,052 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 106 transitions. [2021-11-09 09:52:11,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-09 09:52:11,053 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 106 transitions. [2021-11-09 09:52:11,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:52:11,054 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:11,054 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:11,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-09 09:52:11,055 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_circular_createErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:11,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:11,056 INFO L85 PathProgramCache]: Analyzing trace with hash -519186088, now seen corresponding path program 1 times [2021-11-09 09:52:11,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:11,056 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031280066] [2021-11-09 09:52:11,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:11,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:11,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,130 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:11,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:11,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:11,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,227 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:52:11,230 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:11,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031280066] [2021-11-09 09:52:11,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031280066] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:11,236 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:11,236 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:52:11,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529061407] [2021-11-09 09:52:11,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:52:11,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:11,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:52:11,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:52:11,239 INFO L87 Difference]: Start difference. First operand 102 states and 106 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:11,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:11,701 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2021-11-09 09:52:11,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:52:11,701 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-11-09 09:52:11,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:11,704 INFO L225 Difference]: With dead ends: 102 [2021-11-09 09:52:11,704 INFO L226 Difference]: Without dead ends: 102 [2021-11-09 09:52:11,705 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:52:11,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-09 09:52:11,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-11-09 09:52:11,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 52 states have (on average 1.8076923076923077) internal successors, (94), 90 states have internal predecessors, (94), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-09 09:52:11,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 105 transitions. [2021-11-09 09:52:11,714 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 105 transitions. Word has length 30 [2021-11-09 09:52:11,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:11,714 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 105 transitions. [2021-11-09 09:52:11,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 5 states have internal predecessors, (20), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:11,715 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 105 transitions. [2021-11-09 09:52:11,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-09 09:52:11,716 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:11,716 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:11,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-09 09:52:11,717 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting dll_circular_createErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:11,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:11,717 INFO L85 PathProgramCache]: Analyzing trace with hash -519186087, now seen corresponding path program 1 times [2021-11-09 09:52:11,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:11,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038249740] [2021-11-09 09:52:11,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:11,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:11,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:11,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:11,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:11,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:11,929 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:11,929 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:11,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038249740] [2021-11-09 09:52:11,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038249740] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:11,930 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:11,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:52:11,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514962040] [2021-11-09 09:52:11,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:52:11,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:11,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:52:11,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:52:11,932 INFO L87 Difference]: Start difference. First operand 101 states and 105 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:12,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:12,317 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2021-11-09 09:52:12,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:52:12,318 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 30 [2021-11-09 09:52:12,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:12,319 INFO L225 Difference]: With dead ends: 101 [2021-11-09 09:52:12,319 INFO L226 Difference]: Without dead ends: 101 [2021-11-09 09:52:12,320 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:52:12,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-09 09:52:12,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-11-09 09:52:12,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 52 states have (on average 1.7884615384615385) internal successors, (93), 89 states have internal predecessors, (93), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-09 09:52:12,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2021-11-09 09:52:12,328 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 30 [2021-11-09 09:52:12,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:12,329 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2021-11-09 09:52:12,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 5 states have internal predecessors, (22), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:12,329 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2021-11-09 09:52:12,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:52:12,338 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:12,339 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:12,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-09 09:52:12,340 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:12,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:12,341 INFO L85 PathProgramCache]: Analyzing trace with hash -721624359, now seen corresponding path program 1 times [2021-11-09 09:52:12,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:12,341 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600196226] [2021-11-09 09:52:12,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:12,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:12,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:12,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:12,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:12,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:12,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:12,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:12,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:12,626 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:12,626 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:12,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600196226] [2021-11-09 09:52:12,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600196226] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:12,627 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [30781426] [2021-11-09 09:52:12,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:12,627 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:12,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:12,634 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:12,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-09 09:52:12,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:12,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-09 09:52:12,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:12,978 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 09:52:13,286 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 09:52:13,286 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 09:52:13,462 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:52:13,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [30781426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:13,465 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:13,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-11-09 09:52:13,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187145309] [2021-11-09 09:52:13,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-09 09:52:13,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:13,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-09 09:52:13,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:52:13,472 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:14,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:14,182 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2021-11-09 09:52:14,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:52:14,183 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-11-09 09:52:14,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:14,184 INFO L225 Difference]: With dead ends: 108 [2021-11-09 09:52:14,185 INFO L226 Difference]: Without dead ends: 108 [2021-11-09 09:52:14,185 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:52:14,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-09 09:52:14,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 105. [2021-11-09 09:52:14,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 56 states have (on average 1.7678571428571428) internal successors, (99), 93 states have internal predecessors, (99), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:14,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2021-11-09 09:52:14,199 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 32 [2021-11-09 09:52:14,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:14,199 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2021-11-09 09:52:14,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.25) internal successors, (39), 9 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:14,200 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2021-11-09 09:52:14,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-09 09:52:14,204 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:14,204 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:14,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:14,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:14,430 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_circular_createErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:14,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:14,431 INFO L85 PathProgramCache]: Analyzing trace with hash -721624358, now seen corresponding path program 1 times [2021-11-09 09:52:14,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:14,431 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081070455] [2021-11-09 09:52:14,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:14,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:14,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:14,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:14,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:14,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:14,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:14,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:14,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:14,778 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:14,779 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:14,779 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081070455] [2021-11-09 09:52:14,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081070455] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:14,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145940059] [2021-11-09 09:52:14,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:14,780 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:14,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:14,782 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:14,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-09 09:52:14,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:15,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-09 09:52:15,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:15,058 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 09:52:15,068 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 09:52:15,480 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-09 09:52:15,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 22 treesize of output 24 [2021-11-09 09:52:15,491 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:52:15,491 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 21 treesize of output 21 [2021-11-09 09:52:15,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:52:15,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145940059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:15,603 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:15,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2021-11-09 09:52:15,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952729437] [2021-11-09 09:52:15,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:52:15,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:15,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:52:15,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:52:15,607 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:16,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:16,370 INFO L93 Difference]: Finished difference Result 107 states and 113 transitions. [2021-11-09 09:52:16,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:52:16,371 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2021-11-09 09:52:16,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:16,373 INFO L225 Difference]: With dead ends: 107 [2021-11-09 09:52:16,373 INFO L226 Difference]: Without dead ends: 107 [2021-11-09 09:52:16,373 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-11-09 09:52:16,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-09 09:52:16,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2021-11-09 09:52:16,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 56 states have (on average 1.75) internal successors, (98), 93 states have internal predecessors, (98), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:16,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 111 transitions. [2021-11-09 09:52:16,380 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 111 transitions. Word has length 32 [2021-11-09 09:52:16,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:16,381 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 111 transitions. [2021-11-09 09:52:16,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 11 states have internal predecessors, (39), 2 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:16,381 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 111 transitions. [2021-11-09 09:52:16,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-09 09:52:16,383 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:16,383 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:16,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:16,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-09 09:52:16,599 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:16,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:16,599 INFO L85 PathProgramCache]: Analyzing trace with hash -1991120049, now seen corresponding path program 1 times [2021-11-09 09:52:16,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:16,600 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211458947] [2021-11-09 09:52:16,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:16,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:16,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:16,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:16,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:16,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:16,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:16,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:16,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:16,761 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:16,762 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:16,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211458947] [2021-11-09 09:52:16,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211458947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:16,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533446140] [2021-11-09 09:52:16,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:16,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:16,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:16,766 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:16,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-09 09:52:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:16,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-09 09:52:16,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:17,160 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:17,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533446140] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:17,163 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:17,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 8 [2021-11-09 09:52:17,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115628786] [2021-11-09 09:52:17,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:52:17,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:17,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:52:17,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:52:17,166 INFO L87 Difference]: Start difference. First operand 105 states and 111 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-09 09:52:17,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:17,518 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2021-11-09 09:52:17,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:52:17,519 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 34 [2021-11-09 09:52:17,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:17,520 INFO L225 Difference]: With dead ends: 106 [2021-11-09 09:52:17,521 INFO L226 Difference]: Without dead ends: 106 [2021-11-09 09:52:17,521 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:52:17,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-09 09:52:17,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-11-09 09:52:17,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 56 states have (on average 1.7321428571428572) internal successors, (97), 93 states have internal predecessors, (97), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:17,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 110 transitions. [2021-11-09 09:52:17,534 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 110 transitions. Word has length 34 [2021-11-09 09:52:17,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:17,536 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 110 transitions. [2021-11-09 09:52:17,537 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-09 09:52:17,537 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 110 transitions. [2021-11-09 09:52:17,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-09 09:52:17,542 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:17,542 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:17,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:17,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:17,758 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_circular_createErr4REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:17,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:17,758 INFO L85 PathProgramCache]: Analyzing trace with hash -1599960033, now seen corresponding path program 1 times [2021-11-09 09:52:17,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:17,759 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021770553] [2021-11-09 09:52:17,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:17,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:17,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:17,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:17,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:17,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:17,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:17,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:17,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:17,917 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:52:17,917 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:17,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021770553] [2021-11-09 09:52:17,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021770553] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:17,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865073264] [2021-11-09 09:52:17,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:17,918 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:17,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:17,922 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:17,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-09 09:52:18,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:18,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-09 09:52:18,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:18,222 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:52:18,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865073264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:18,222 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:18,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3] total 6 [2021-11-09 09:52:18,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025663144] [2021-11-09 09:52:18,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:52:18,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:18,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:52:18,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:52:18,225 INFO L87 Difference]: Start difference. First operand 105 states and 110 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:18,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:18,606 INFO L93 Difference]: Finished difference Result 110 states and 117 transitions. [2021-11-09 09:52:18,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:52:18,606 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-11-09 09:52:18,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:18,608 INFO L225 Difference]: With dead ends: 110 [2021-11-09 09:52:18,608 INFO L226 Difference]: Without dead ends: 110 [2021-11-09 09:52:18,609 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-09 09:52:18,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-09 09:52:18,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2021-11-09 09:52:18,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 59 states have (on average 1.728813559322034) internal successors, (102), 96 states have internal predecessors, (102), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:18,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 115 transitions. [2021-11-09 09:52:18,615 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 115 transitions. Word has length 35 [2021-11-09 09:52:18,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:18,615 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 115 transitions. [2021-11-09 09:52:18,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:18,616 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 115 transitions. [2021-11-09 09:52:18,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-09 09:52:18,617 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:18,617 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:18,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:18,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:18,838 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_circular_createErr5REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:18,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:18,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1599960032, now seen corresponding path program 1 times [2021-11-09 09:52:18,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:18,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761609138] [2021-11-09 09:52:18,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:18,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:18,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:18,994 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:18,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:19,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:19,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:19,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:19,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:19,102 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:19,102 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:19,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761609138] [2021-11-09 09:52:19,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761609138] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:19,103 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940949776] [2021-11-09 09:52:19,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:19,104 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:19,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:19,106 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:19,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-09 09:52:19,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:19,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-09 09:52:19,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:19,617 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:19,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940949776] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:19,617 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:19,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 14 [2021-11-09 09:52:19,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255380884] [2021-11-09 09:52:19,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:52:19,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:19,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:52:19,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:52:19,619 INFO L87 Difference]: Start difference. First operand 108 states and 115 transitions. Second operand has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:52:20,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:20,129 INFO L93 Difference]: Finished difference Result 115 states and 122 transitions. [2021-11-09 09:52:20,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:52:20,131 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-11-09 09:52:20,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:20,132 INFO L225 Difference]: With dead ends: 115 [2021-11-09 09:52:20,132 INFO L226 Difference]: Without dead ends: 115 [2021-11-09 09:52:20,133 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:52:20,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-09 09:52:20,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 108. [2021-11-09 09:52:20,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 59 states have (on average 1.7118644067796611) internal successors, (101), 96 states have internal predecessors, (101), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:20,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 114 transitions. [2021-11-09 09:52:20,144 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 114 transitions. Word has length 35 [2021-11-09 09:52:20,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:20,145 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 114 transitions. [2021-11-09 09:52:20,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 11 states have internal predecessors, (45), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:52:20,145 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 114 transitions. [2021-11-09 09:52:20,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:52:20,147 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:20,147 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:20,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:20,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-09 09:52:20,370 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_circular_createErr6REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:20,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:20,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1940846539, now seen corresponding path program 1 times [2021-11-09 09:52:20,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:20,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815319201] [2021-11-09 09:52:20,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:20,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:20,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:20,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:20,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:20,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:20,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:20,458 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:20,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:20,495 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:52:20,495 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:20,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815319201] [2021-11-09 09:52:20,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815319201] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:20,496 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:20,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-09 09:52:20,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886703704] [2021-11-09 09:52:20,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:52:20,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:20,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:52:20,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:52:20,503 INFO L87 Difference]: Start difference. First operand 108 states and 114 transitions. Second operand has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:20,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:20,958 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2021-11-09 09:52:20,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:52:20,959 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-11-09 09:52:20,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:20,960 INFO L225 Difference]: With dead ends: 108 [2021-11-09 09:52:20,960 INFO L226 Difference]: Without dead ends: 108 [2021-11-09 09:52:20,961 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:52:20,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-09 09:52:20,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-11-09 09:52:20,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 59 states have (on average 1.694915254237288) internal successors, (100), 95 states have internal predecessors, (100), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:20,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2021-11-09 09:52:20,965 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 36 [2021-11-09 09:52:20,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:20,965 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2021-11-09 09:52:20,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.25) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:20,966 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2021-11-09 09:52:20,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-09 09:52:20,966 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:20,967 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:20,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-09 09:52:20,967 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_circular_createErr7REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:20,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:20,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1940846540, now seen corresponding path program 1 times [2021-11-09 09:52:20,967 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:20,968 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538088083] [2021-11-09 09:52:20,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:20,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:20,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:21,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:21,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:21,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,131 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:21,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:21,132 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538088083] [2021-11-09 09:52:21,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538088083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:21,132 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:21,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-09 09:52:21,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358129803] [2021-11-09 09:52:21,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 09:52:21,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:21,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 09:52:21,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-09 09:52:21,134 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:21,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:21,542 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2021-11-09 09:52:21,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-09 09:52:21,543 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-11-09 09:52:21,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:21,544 INFO L225 Difference]: With dead ends: 106 [2021-11-09 09:52:21,544 INFO L226 Difference]: Without dead ends: 106 [2021-11-09 09:52:21,544 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:52:21,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-09 09:52:21,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2021-11-09 09:52:21,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 59 states have (on average 1.6779661016949152) internal successors, (99), 94 states have internal predecessors, (99), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:21,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 112 transitions. [2021-11-09 09:52:21,549 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 112 transitions. Word has length 36 [2021-11-09 09:52:21,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:21,550 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 112 transitions. [2021-11-09 09:52:21,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-09 09:52:21,550 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 112 transitions. [2021-11-09 09:52:21,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-09 09:52:21,551 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:21,551 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:21,552 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-09 09:52:21,552 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:21,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:21,552 INFO L85 PathProgramCache]: Analyzing trace with hash -1507927114, now seen corresponding path program 1 times [2021-11-09 09:52:21,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:21,553 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861241942] [2021-11-09 09:52:21,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:21,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:21,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:21,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:21,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:21,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:21,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:21,658 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:52:21,658 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:21,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861241942] [2021-11-09 09:52:21,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861241942] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:21,659 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:21,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-09 09:52:21,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451535379] [2021-11-09 09:52:21,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 09:52:21,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:21,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 09:52:21,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-09 09:52:21,661 INFO L87 Difference]: Start difference. First operand 106 states and 112 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:21,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:21,921 INFO L93 Difference]: Finished difference Result 109 states and 116 transitions. [2021-11-09 09:52:21,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:52:21,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 42 [2021-11-09 09:52:21,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:21,923 INFO L225 Difference]: With dead ends: 109 [2021-11-09 09:52:21,924 INFO L226 Difference]: Without dead ends: 109 [2021-11-09 09:52:21,924 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:52:21,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-09 09:52:21,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-11-09 09:52:21,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 60 states have (on average 1.6666666666666667) internal successors, (100), 95 states have internal predecessors, (100), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:21,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 113 transitions. [2021-11-09 09:52:21,930 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 113 transitions. Word has length 42 [2021-11-09 09:52:21,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:21,930 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 113 transitions. [2021-11-09 09:52:21,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 113 transitions. [2021-11-09 09:52:21,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-09 09:52:21,932 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:21,932 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:21,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-09 09:52:21,933 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_circular_remove_firstErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:21,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:21,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1713838971, now seen corresponding path program 1 times [2021-11-09 09:52:21,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:21,934 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212856560] [2021-11-09 09:52:21,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:21,934 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:21,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:22,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:22,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,237 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:22,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,342 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:22,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,533 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:52:22,533 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:22,533 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212856560] [2021-11-09 09:52:22,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212856560] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:22,534 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199564328] [2021-11-09 09:52:22,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:22,534 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:22,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:22,536 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:22,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-09 09:52:22,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:22,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-09 09:52:22,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:22,864 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 09:52:22,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 09:52:23,398 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-11-09 09:52:23,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 24 [2021-11-09 09:52:23,579 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:23,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199564328] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:23,580 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:23,580 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 23 [2021-11-09 09:52:23,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716072744] [2021-11-09 09:52:23,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-09 09:52:23,581 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:23,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-09 09:52:23,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=474, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:52:23,582 INFO L87 Difference]: Start difference. First operand 107 states and 113 transitions. Second operand has 24 states, 22 states have (on average 3.0) internal successors, (66), 19 states have internal predecessors, (66), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:52:25,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:25,482 INFO L93 Difference]: Finished difference Result 150 states and 159 transitions. [2021-11-09 09:52:25,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-09 09:52:25,483 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 3.0) internal successors, (66), 19 states have internal predecessors, (66), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 44 [2021-11-09 09:52:25,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:25,484 INFO L225 Difference]: With dead ends: 150 [2021-11-09 09:52:25,484 INFO L226 Difference]: Without dead ends: 150 [2021-11-09 09:52:25,485 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=200, Invalid=1132, Unknown=0, NotChecked=0, Total=1332 [2021-11-09 09:52:25,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-09 09:52:25,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 112. [2021-11-09 09:52:25,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 67 states have (on average 1.5522388059701493) internal successors, (104), 98 states have internal predecessors, (104), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-09 09:52:25,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2021-11-09 09:52:25,491 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 44 [2021-11-09 09:52:25,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:25,491 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2021-11-09 09:52:25,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 3.0) internal successors, (66), 19 states have internal predecessors, (66), 7 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:52:25,492 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2021-11-09 09:52:25,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-09 09:52:25,494 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:25,494 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:25,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:25,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-09 09:52:25,698 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_circular_remove_firstErr1REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:25,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:25,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1713838970, now seen corresponding path program 1 times [2021-11-09 09:52:25,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:25,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184530990] [2021-11-09 09:52:25,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:25,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:25,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:25,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:25,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:25,826 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:25,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:25,985 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:25,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:26,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:26,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:52:26,202 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:26,202 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184530990] [2021-11-09 09:52:26,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184530990] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:26,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794724402] [2021-11-09 09:52:26,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:26,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:26,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:26,210 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:26,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-09 09:52:26,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:26,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-09 09:52:26,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:26,477 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 09:52:26,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 09:52:26,542 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 09:52:26,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 09:52:26,877 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:52:26,878 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 23 treesize of output 23 [2021-11-09 09:52:27,241 INFO L354 Elim1Store]: treesize reduction 40, result has 27.3 percent of original size [2021-11-09 09:52:27,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 24 treesize of output 32 [2021-11-09 09:52:27,799 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:52:27,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794724402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:27,799 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:27,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 26 [2021-11-09 09:52:27,800 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126984728] [2021-11-09 09:52:27,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-09 09:52:27,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:27,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-09 09:52:27,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2021-11-09 09:52:27,802 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand has 27 states, 24 states have (on average 2.5) internal successors, (60), 20 states have internal predecessors, (60), 8 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:52:30,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:30,084 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2021-11-09 09:52:30,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-09 09:52:30,084 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.5) internal successors, (60), 20 states have internal predecessors, (60), 8 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 44 [2021-11-09 09:52:30,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:30,086 INFO L225 Difference]: With dead ends: 170 [2021-11-09 09:52:30,086 INFO L226 Difference]: Without dead ends: 170 [2021-11-09 09:52:30,087 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=247, Invalid=1475, Unknown=0, NotChecked=0, Total=1722 [2021-11-09 09:52:30,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-09 09:52:30,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 148. [2021-11-09 09:52:30,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 99 states have (on average 1.5656565656565657) internal successors, (155), 131 states have internal predecessors, (155), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (10), 8 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-09 09:52:30,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 175 transitions. [2021-11-09 09:52:30,095 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 175 transitions. Word has length 44 [2021-11-09 09:52:30,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:30,096 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 175 transitions. [2021-11-09 09:52:30,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.5) internal successors, (60), 20 states have internal predecessors, (60), 8 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:52:30,096 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 175 transitions. [2021-11-09 09:52:30,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-09 09:52:30,097 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:30,098 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:30,124 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-09 09:52:30,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-09 09:52:30,302 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_circular_remove_firstErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:30,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:30,302 INFO L85 PathProgramCache]: Analyzing trace with hash -1589400471, now seen corresponding path program 1 times [2021-11-09 09:52:30,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:30,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457103222] [2021-11-09 09:52:30,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:30,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:30,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:30,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:30,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:30,404 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:30,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:30,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:30,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:30,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:30,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:30,514 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:52:30,514 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:30,514 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457103222] [2021-11-09 09:52:30,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457103222] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:30,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:30,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-09 09:52:30,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121964132] [2021-11-09 09:52:30,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:52:30,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:30,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:52:30,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:52:30,517 INFO L87 Difference]: Start difference. First operand 148 states and 175 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:31,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:31,138 INFO L93 Difference]: Finished difference Result 189 states and 227 transitions. [2021-11-09 09:52:31,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:52:31,138 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 45 [2021-11-09 09:52:31,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:31,140 INFO L225 Difference]: With dead ends: 189 [2021-11-09 09:52:31,140 INFO L226 Difference]: Without dead ends: 189 [2021-11-09 09:52:31,140 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=430, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:52:31,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-09 09:52:31,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 153. [2021-11-09 09:52:31,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 103 states have (on average 1.5825242718446602) internal successors, (163), 135 states have internal predecessors, (163), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (11), 8 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-09 09:52:31,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 185 transitions. [2021-11-09 09:52:31,148 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 185 transitions. Word has length 45 [2021-11-09 09:52:31,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:31,148 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 185 transitions. [2021-11-09 09:52:31,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:31,149 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 185 transitions. [2021-11-09 09:52:31,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-09 09:52:31,150 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:31,150 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:31,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-09 09:52:31,150 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_circular_remove_firstErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:31,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:31,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1589400470, now seen corresponding path program 1 times [2021-11-09 09:52:31,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:31,151 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981602384] [2021-11-09 09:52:31,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:31,151 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:31,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:31,261 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:31,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:31,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:31,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:31,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:31,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:31,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:31,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:31,459 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:31,459 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:31,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981602384] [2021-11-09 09:52:31,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981602384] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:31,459 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:31,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-09 09:52:31,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012492156] [2021-11-09 09:52:31,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:52:31,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:31,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:52:31,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:52:31,463 INFO L87 Difference]: Start difference. First operand 153 states and 185 transitions. Second operand has 15 states, 14 states have (on average 2.5) internal successors, (35), 10 states have internal predecessors, (35), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:32,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:32,304 INFO L93 Difference]: Finished difference Result 191 states and 229 transitions. [2021-11-09 09:52:32,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-09 09:52:32,307 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 10 states have internal predecessors, (35), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 45 [2021-11-09 09:52:32,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:32,309 INFO L225 Difference]: With dead ends: 191 [2021-11-09 09:52:32,309 INFO L226 Difference]: Without dead ends: 191 [2021-11-09 09:52:32,309 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2021-11-09 09:52:32,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-09 09:52:32,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 153. [2021-11-09 09:52:32,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 103 states have (on average 1.5631067961165048) internal successors, (161), 135 states have internal predecessors, (161), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (11), 8 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-09 09:52:32,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 183 transitions. [2021-11-09 09:52:32,322 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 183 transitions. Word has length 45 [2021-11-09 09:52:32,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:32,322 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 183 transitions. [2021-11-09 09:52:32,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.5) internal successors, (35), 10 states have internal predecessors, (35), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:32,323 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 183 transitions. [2021-11-09 09:52:32,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-09 09:52:32,324 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:32,324 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:32,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-09 09:52:32,324 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_circular_createErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:32,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:32,325 INFO L85 PathProgramCache]: Analyzing trace with hash 65559817, now seen corresponding path program 1 times [2021-11-09 09:52:32,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:32,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9994596] [2021-11-09 09:52:32,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:32,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:32,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:32,411 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:32,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:32,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-11-09 09:52:32,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:32,440 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-09 09:52:32,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:32,447 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-11-09 09:52:32,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:32,455 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-09 09:52:32,455 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:32,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9994596] [2021-11-09 09:52:32,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9994596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:32,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940180735] [2021-11-09 09:52:32,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:32,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:32,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:32,457 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:32,477 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-09 09:52:32,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:32,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-09 09:52:32,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:32,973 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:52:32,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940180735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:32,973 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:52:32,973 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-09 09:52:32,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749923748] [2021-11-09 09:52:32,974 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 09:52:32,974 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:32,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 09:52:32,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:52:32,975 INFO L87 Difference]: Start difference. First operand 153 states and 183 transitions. Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-09 09:52:33,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:33,036 INFO L93 Difference]: Finished difference Result 95 states and 97 transitions. [2021-11-09 09:52:33,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 09:52:33,037 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 47 [2021-11-09 09:52:33,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:33,038 INFO L225 Difference]: With dead ends: 95 [2021-11-09 09:52:33,038 INFO L226 Difference]: Without dead ends: 95 [2021-11-09 09:52:33,039 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-09 09:52:33,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-09 09:52:33,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-09 09:52:33,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 63 states have (on average 1.3333333333333333) internal successors, (84), 82 states have internal predecessors, (84), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:33,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-11-09 09:52:33,045 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 47 [2021-11-09 09:52:33,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:33,045 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-11-09 09:52:33,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-09 09:52:33,046 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-11-09 09:52:33,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-09 09:52:33,046 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:33,047 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:33,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:33,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-09 09:52:33,270 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_circular_remove_firstErr15REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:33,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:33,270 INFO L85 PathProgramCache]: Analyzing trace with hash -370087074, now seen corresponding path program 1 times [2021-11-09 09:52:33,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:33,271 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940285900] [2021-11-09 09:52:33,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:33,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:33,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:33,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:33,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:33,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,379 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:33,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,386 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:52:33,387 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:33,387 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940285900] [2021-11-09 09:52:33,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940285900] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:33,387 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:33,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-09 09:52:33,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074858767] [2021-11-09 09:52:33,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:52:33,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:33,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:52:33,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:52:33,390 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 7 states, 6 states have (on average 5.5) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:33,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:33,717 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-11-09 09:52:33,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:52:33,718 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.5) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 50 [2021-11-09 09:52:33,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:33,719 INFO L225 Difference]: With dead ends: 94 [2021-11-09 09:52:33,719 INFO L226 Difference]: Without dead ends: 94 [2021-11-09 09:52:33,719 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:52:33,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-09 09:52:33,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-11-09 09:52:33,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 63 states have (on average 1.3174603174603174) internal successors, (83), 81 states have internal predecessors, (83), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:33,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-11-09 09:52:33,723 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 50 [2021-11-09 09:52:33,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:33,723 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-11-09 09:52:33,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.5) internal successors, (33), 5 states have internal predecessors, (33), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:33,724 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-11-09 09:52:33,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-09 09:52:33,724 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:33,724 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:33,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-09 09:52:33,725 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_circular_remove_firstErr16REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:33,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:33,725 INFO L85 PathProgramCache]: Analyzing trace with hash -370087073, now seen corresponding path program 1 times [2021-11-09 09:52:33,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:33,725 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530447158] [2021-11-09 09:52:33,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:33,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:33,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:33,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:33,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:33,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:33,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:34,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:34,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:34,064 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:34,064 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:34,064 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530447158] [2021-11-09 09:52:34,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530447158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:34,065 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:34,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-09 09:52:34,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944807181] [2021-11-09 09:52:34,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-09 09:52:34,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:34,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-09 09:52:34,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-11-09 09:52:34,068 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:34,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:34,853 INFO L93 Difference]: Finished difference Result 112 states and 115 transitions. [2021-11-09 09:52:34,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-09 09:52:34,853 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 50 [2021-11-09 09:52:34,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:34,854 INFO L225 Difference]: With dead ends: 112 [2021-11-09 09:52:34,854 INFO L226 Difference]: Without dead ends: 112 [2021-11-09 09:52:34,855 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-11-09 09:52:34,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-09 09:52:34,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 99. [2021-11-09 09:52:34,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 68 states have (on average 1.3088235294117647) internal successors, (89), 86 states have internal predecessors, (89), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:52:34,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-11-09 09:52:34,859 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 50 [2021-11-09 09:52:34,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:34,859 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-11-09 09:52:34,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:34,859 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-11-09 09:52:34,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-09 09:52:34,860 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:34,860 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:34,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-09 09:52:34,860 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_circular_remove_firstErr8ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:34,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:34,860 INFO L85 PathProgramCache]: Analyzing trace with hash -370100977, now seen corresponding path program 1 times [2021-11-09 09:52:34,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:34,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029895029] [2021-11-09 09:52:34,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:34,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:34,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:34,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:34,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:34,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:35,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:35,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,078 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:35,078 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:35,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029895029] [2021-11-09 09:52:35,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029895029] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:35,078 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:35,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-09 09:52:35,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135329164] [2021-11-09 09:52:35,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:52:35,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:35,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:52:35,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:52:35,080 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 15 states, 14 states have (on average 2.857142857142857) internal successors, (40), 10 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:35,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:35,596 INFO L93 Difference]: Finished difference Result 135 states and 142 transitions. [2021-11-09 09:52:35,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-09 09:52:35,597 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.857142857142857) internal successors, (40), 10 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 50 [2021-11-09 09:52:35,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:35,598 INFO L225 Difference]: With dead ends: 135 [2021-11-09 09:52:35,598 INFO L226 Difference]: Without dead ends: 135 [2021-11-09 09:52:35,598 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:52:35,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-09 09:52:35,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 117. [2021-11-09 09:52:35,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 83 states have (on average 1.3493975903614457) internal successors, (112), 102 states have internal predecessors, (112), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:35,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 130 transitions. [2021-11-09 09:52:35,604 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 130 transitions. Word has length 50 [2021-11-09 09:52:35,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:35,604 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 130 transitions. [2021-11-09 09:52:35,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.857142857142857) internal successors, (40), 10 states have internal predecessors, (40), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:35,605 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 130 transitions. [2021-11-09 09:52:35,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-09 09:52:35,606 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:35,606 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:35,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-09 09:52:35,606 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_circular_remove_firstErr9ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:35,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:35,607 INFO L85 PathProgramCache]: Analyzing trace with hash 1411771755, now seen corresponding path program 1 times [2021-11-09 09:52:35,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:35,607 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734137887] [2021-11-09 09:52:35,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:35,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:35,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:35,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:35,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,778 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:35,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:35,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:35,844 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:35,845 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:35,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734137887] [2021-11-09 09:52:35,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734137887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:35,845 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:35,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-09 09:52:35,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347584121] [2021-11-09 09:52:35,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-09 09:52:35,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:35,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-09 09:52:35,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-11-09 09:52:35,847 INFO L87 Difference]: Start difference. First operand 117 states and 130 transitions. Second operand has 15 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:36,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:36,409 INFO L93 Difference]: Finished difference Result 128 states and 141 transitions. [2021-11-09 09:52:36,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-09 09:52:36,412 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 51 [2021-11-09 09:52:36,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:36,413 INFO L225 Difference]: With dead ends: 128 [2021-11-09 09:52:36,413 INFO L226 Difference]: Without dead ends: 128 [2021-11-09 09:52:36,414 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2021-11-09 09:52:36,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-09 09:52:36,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 120. [2021-11-09 09:52:36,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 86 states have (on average 1.3372093023255813) internal successors, (115), 105 states have internal predecessors, (115), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:36,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 133 transitions. [2021-11-09 09:52:36,419 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 133 transitions. Word has length 51 [2021-11-09 09:52:36,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:36,419 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 133 transitions. [2021-11-09 09:52:36,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.9285714285714284) internal successors, (41), 10 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:36,420 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 133 transitions. [2021-11-09 09:52:36,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-09 09:52:36,420 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:36,421 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:36,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-09 09:52:36,421 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_circular_remove_firstErr17REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:36,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:36,422 INFO L85 PathProgramCache]: Analyzing trace with hash 828610911, now seen corresponding path program 1 times [2021-11-09 09:52:36,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:36,422 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798500313] [2021-11-09 09:52:36,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:36,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:36,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:36,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:36,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:36,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:36,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:36,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:36,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:36,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:36,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:36,957 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:36,957 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:36,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798500313] [2021-11-09 09:52:36,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [798500313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:36,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013979829] [2021-11-09 09:52:36,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:36,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:36,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:36,962 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:36,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-09 09:52:37,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:37,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-09 09:52:37,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:37,384 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 09:52:37,575 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:52:37,576 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 09:52:37,632 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 09:52:37,711 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-09 09:52:37,767 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_circular_create_~head~0.offset] [2021-11-09 09:52:37,768 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:52:37,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2021-11-09 09:52:37,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776922302] [2021-11-09 09:52:37,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-09 09:52:37,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:37,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-09 09:52:37,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=748, Unknown=0, NotChecked=0, Total=812 [2021-11-09 09:52:37,772 INFO L87 Difference]: Start difference. First operand 120 states and 133 transitions. Second operand has 25 states, 24 states have (on average 1.75) internal successors, (42), 19 states have internal predecessors, (42), 3 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:38,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:38,872 INFO L93 Difference]: Finished difference Result 125 states and 138 transitions. [2021-11-09 09:52:38,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-09 09:52:38,873 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.75) internal successors, (42), 19 states have internal predecessors, (42), 3 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 52 [2021-11-09 09:52:38,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:38,874 INFO L225 Difference]: With dead ends: 125 [2021-11-09 09:52:38,874 INFO L226 Difference]: Without dead ends: 125 [2021-11-09 09:52:38,875 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=162, Invalid=1560, Unknown=0, NotChecked=0, Total=1722 [2021-11-09 09:52:38,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-09 09:52:38,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 122. [2021-11-09 09:52:38,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 88 states have (on average 1.3409090909090908) internal successors, (118), 107 states have internal predecessors, (118), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:38,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 136 transitions. [2021-11-09 09:52:38,881 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 136 transitions. Word has length 52 [2021-11-09 09:52:38,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:38,881 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 136 transitions. [2021-11-09 09:52:38,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.75) internal successors, (42), 19 states have internal predecessors, (42), 3 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:38,882 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 136 transitions. [2021-11-09 09:52:38,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-09 09:52:38,882 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:38,883 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:38,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:39,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:39,098 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_circular_remove_firstErr18REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:39,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:39,098 INFO L85 PathProgramCache]: Analyzing trace with hash 828610912, now seen corresponding path program 1 times [2021-11-09 09:52:39,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:39,099 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657696363] [2021-11-09 09:52:39,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:39,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:39,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:39,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:39,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:39,315 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:39,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:39,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:39,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:39,793 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:39,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:39,897 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:39,898 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:39,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657696363] [2021-11-09 09:52:39,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1657696363] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:39,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967560204] [2021-11-09 09:52:39,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:39,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:39,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:39,899 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:39,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-09 09:52:40,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:40,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-09 09:52:40,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:40,287 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 09:52:40,301 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 09:52:40,801 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-09 09:52:40,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 12 treesize of output 14 [2021-11-09 09:52:40,814 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:52:40,814 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 09:52:40,984 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 09:52:40,992 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 09:52:41,134 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 46 [2021-11-09 09:52:41,140 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 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-09 09:52:41,394 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 26 treesize of output 28 [2021-11-09 09:52:41,418 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 26 treesize of output 28 [2021-11-09 09:52:41,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:52:41,540 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:52:41,550 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 09:52:41,551 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 4 case distinctions, treesize of input 99 treesize of output 83 [2021-11-09 09:52:41,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:52:41,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:52:41,569 INFO L354 Elim1Store]: treesize reduction 41, result has 21.2 percent of original size [2021-11-09 09:52:41,570 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 4 case distinctions, treesize of input 95 treesize of output 100 [2021-11-09 09:52:43,149 INFO L354 Elim1Store]: treesize reduction 133, result has 5.7 percent of original size [2021-11-09 09:52:43,149 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 239 treesize of output 115 [2021-11-09 09:52:43,179 INFO L354 Elim1Store]: treesize reduction 118, result has 2.5 percent of original size [2021-11-09 09:52:43,180 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 8 new quantified variables, introduced 15 case distinctions, treesize of input 82 treesize of output 51 [2021-11-09 09:52:43,343 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:52:43,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967560204] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:43,344 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:43,344 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 26] total 49 [2021-11-09 09:52:43,344 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252796687] [2021-11-09 09:52:43,344 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-09 09:52:43,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:43,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-09 09:52:43,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2303, Unknown=0, NotChecked=0, Total=2450 [2021-11-09 09:52:43,346 INFO L87 Difference]: Start difference. First operand 122 states and 136 transitions. Second operand has 50 states, 48 states have (on average 1.7291666666666667) internal successors, (83), 39 states have internal predecessors, (83), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-09 09:52:46,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:46,129 INFO L93 Difference]: Finished difference Result 142 states and 153 transitions. [2021-11-09 09:52:46,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-09 09:52:46,129 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 48 states have (on average 1.7291666666666667) internal successors, (83), 39 states have internal predecessors, (83), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 52 [2021-11-09 09:52:46,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:46,131 INFO L225 Difference]: With dead ends: 142 [2021-11-09 09:52:46,131 INFO L226 Difference]: Without dead ends: 142 [2021-11-09 09:52:46,132 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=335, Invalid=4087, Unknown=0, NotChecked=0, Total=4422 [2021-11-09 09:52:46,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-09 09:52:46,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 134. [2021-11-09 09:52:46,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 98 states have (on average 1.3775510204081634) internal successors, (135), 119 states have internal predecessors, (135), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:46,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 153 transitions. [2021-11-09 09:52:46,137 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 153 transitions. Word has length 52 [2021-11-09 09:52:46,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:46,138 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 153 transitions. [2021-11-09 09:52:46,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 48 states have (on average 1.7291666666666667) internal successors, (83), 39 states have internal predecessors, (83), 6 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-09 09:52:46,138 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 153 transitions. [2021-11-09 09:52:46,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-09 09:52:46,139 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:46,139 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:46,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:46,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-09 09:52:46,346 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_circular_remove_firstErr10ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:46,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:46,347 INFO L85 PathProgramCache]: Analyzing trace with hash 815251601, now seen corresponding path program 1 times [2021-11-09 09:52:46,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:46,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72926981] [2021-11-09 09:52:46,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:46,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:46,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:46,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:46,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:46,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:46,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,456 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:52:46,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:46,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72926981] [2021-11-09 09:52:46,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72926981] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:46,457 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:46,457 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-09 09:52:46,457 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543580112] [2021-11-09 09:52:46,458 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-09 09:52:46,458 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:46,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-09 09:52:46,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-09 09:52:46,459 INFO L87 Difference]: Start difference. First operand 134 states and 153 transitions. Second operand has 7 states, 6 states have (on average 5.833333333333333) internal successors, (35), 5 states have internal predecessors, (35), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:46,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:46,701 INFO L93 Difference]: Finished difference Result 133 states and 150 transitions. [2021-11-09 09:52:46,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:52:46,702 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.833333333333333) internal successors, (35), 5 states have internal predecessors, (35), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 52 [2021-11-09 09:52:46,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:46,706 INFO L225 Difference]: With dead ends: 133 [2021-11-09 09:52:46,706 INFO L226 Difference]: Without dead ends: 133 [2021-11-09 09:52:46,707 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:52:46,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-09 09:52:46,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-11-09 09:52:46,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.346938775510204) internal successors, (132), 118 states have internal predecessors, (132), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:46,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 150 transitions. [2021-11-09 09:52:46,721 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 150 transitions. Word has length 52 [2021-11-09 09:52:46,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:46,723 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 150 transitions. [2021-11-09 09:52:46,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.833333333333333) internal successors, (35), 5 states have internal predecessors, (35), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:46,724 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 150 transitions. [2021-11-09 09:52:46,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-09 09:52:46,725 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:46,725 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:46,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-09 09:52:46,725 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting dll_circular_remove_firstErr20REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:46,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:46,727 INFO L85 PathProgramCache]: Analyzing trace with hash -82865422, now seen corresponding path program 1 times [2021-11-09 09:52:46,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:46,728 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379057581] [2021-11-09 09:52:46,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:46,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:46,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:46,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:46,990 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:47,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:47,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:47,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:47,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:47,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:47,369 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:47,369 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:47,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379057581] [2021-11-09 09:52:47,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379057581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:47,370 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371369755] [2021-11-09 09:52:47,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:47,370 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:47,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:47,371 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:47,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-09 09:52:47,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:47,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-09 09:52:47,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:48,015 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 37 treesize of output 33 [2021-11-09 09:52:48,018 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 36 treesize of output 32 [2021-11-09 09:52:48,549 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-11-09 09:52:48,550 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 87 treesize of output 50 [2021-11-09 09:52:48,564 INFO L354 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2021-11-09 09:52:48,570 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 44 treesize of output 28 [2021-11-09 09:52:48,672 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-09 09:52:48,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371369755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:48,672 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:48,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 14] total 35 [2021-11-09 09:52:48,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708889473] [2021-11-09 09:52:48,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-09 09:52:48,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:48,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-09 09:52:48,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=1170, Unknown=0, NotChecked=0, Total=1260 [2021-11-09 09:52:48,675 INFO L87 Difference]: Start difference. First operand 133 states and 150 transitions. Second operand has 36 states, 34 states have (on average 2.2941176470588234) internal successors, (78), 28 states have internal predecessors, (78), 6 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-09 09:52:50,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:50,862 INFO L93 Difference]: Finished difference Result 139 states and 149 transitions. [2021-11-09 09:52:50,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-09 09:52:50,863 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 2.2941176470588234) internal successors, (78), 28 states have internal predecessors, (78), 6 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) Word has length 53 [2021-11-09 09:52:50,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:50,864 INFO L225 Difference]: With dead ends: 139 [2021-11-09 09:52:50,864 INFO L226 Difference]: Without dead ends: 139 [2021-11-09 09:52:50,866 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=239, Invalid=2517, Unknown=0, NotChecked=0, Total=2756 [2021-11-09 09:52:50,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-11-09 09:52:50,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 133. [2021-11-09 09:52:50,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.336734693877551) internal successors, (131), 118 states have internal predecessors, (131), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:50,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 149 transitions. [2021-11-09 09:52:50,872 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 149 transitions. Word has length 53 [2021-11-09 09:52:50,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:50,873 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 149 transitions. [2021-11-09 09:52:50,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 2.2941176470588234) internal successors, (78), 28 states have internal predecessors, (78), 6 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (7), 6 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-09 09:52:50,873 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 149 transitions. [2021-11-09 09:52:50,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-09 09:52:50,874 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:50,874 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:50,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-09 09:52:51,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:51,086 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_circular_remove_firstErr19REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:51,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:51,086 INFO L85 PathProgramCache]: Analyzing trace with hash -82865423, now seen corresponding path program 1 times [2021-11-09 09:52:51,086 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:51,087 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651724215] [2021-11-09 09:52:51,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:51,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:51,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:51,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:51,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:51,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:51,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:51,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:51,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:51,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:51,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:51,484 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:51,484 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:51,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651724215] [2021-11-09 09:52:51,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651724215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:51,485 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:51,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-11-09 09:52:51,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211773731] [2021-11-09 09:52:51,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-09 09:52:51,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:51,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-09 09:52:51,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:52:51,486 INFO L87 Difference]: Start difference. First operand 133 states and 149 transitions. Second operand has 19 states, 18 states have (on average 2.388888888888889) internal successors, (43), 14 states have internal predecessors, (43), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:52,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:52,351 INFO L93 Difference]: Finished difference Result 133 states and 148 transitions. [2021-11-09 09:52:52,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-09 09:52:52,352 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.388888888888889) internal successors, (43), 14 states have internal predecessors, (43), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 53 [2021-11-09 09:52:52,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:52,354 INFO L225 Difference]: With dead ends: 133 [2021-11-09 09:52:52,354 INFO L226 Difference]: Without dead ends: 133 [2021-11-09 09:52:52,355 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=806, Unknown=0, NotChecked=0, Total=930 [2021-11-09 09:52:52,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-09 09:52:52,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-11-09 09:52:52,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.3265306122448979) internal successors, (130), 118 states have internal predecessors, (130), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:52,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 148 transitions. [2021-11-09 09:52:52,361 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 148 transitions. Word has length 53 [2021-11-09 09:52:52,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:52,361 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 148 transitions. [2021-11-09 09:52:52,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.388888888888889) internal successors, (43), 14 states have internal predecessors, (43), 2 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-09 09:52:52,362 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 148 transitions. [2021-11-09 09:52:52,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-09 09:52:52,362 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:52,363 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:52,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-09 09:52:52,363 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_circular_remove_firstErr11REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:52,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:52,364 INFO L85 PathProgramCache]: Analyzing trace with hash -497003986, now seen corresponding path program 1 times [2021-11-09 09:52:52,364 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:52,364 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654064631] [2021-11-09 09:52:52,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:52,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:52,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:52,499 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:52,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:52,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:52,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:52,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:52,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:52,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:52,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:52,675 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:52,675 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:52,676 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654064631] [2021-11-09 09:52:52,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654064631] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:52:52,676 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:52:52,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-09 09:52:52,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929474092] [2021-11-09 09:52:52,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-09 09:52:52,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:52,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-09 09:52:52,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=270, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:52:52,678 INFO L87 Difference]: Start difference. First operand 133 states and 148 transitions. Second operand has 18 states, 16 states have (on average 2.6875) internal successors, (43), 13 states have internal predecessors, (43), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:53,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:52:53,577 INFO L93 Difference]: Finished difference Result 133 states and 147 transitions. [2021-11-09 09:52:53,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-09 09:52:53,577 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.6875) internal successors, (43), 13 states have internal predecessors, (43), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 53 [2021-11-09 09:52:53,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:52:53,578 INFO L225 Difference]: With dead ends: 133 [2021-11-09 09:52:53,578 INFO L226 Difference]: Without dead ends: 133 [2021-11-09 09:52:53,579 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2021-11-09 09:52:53,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-09 09:52:53,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-11-09 09:52:53,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.316326530612245) internal successors, (129), 118 states have internal predecessors, (129), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:52:53,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 147 transitions. [2021-11-09 09:52:53,584 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 147 transitions. Word has length 53 [2021-11-09 09:52:53,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:52:53,584 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 147 transitions. [2021-11-09 09:52:53,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.6875) internal successors, (43), 13 states have internal predecessors, (43), 3 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:52:53,585 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 147 transitions. [2021-11-09 09:52:53,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-09 09:52:53,585 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:52:53,586 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:52:53,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-09 09:52:53,586 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting dll_circular_remove_firstErr23ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:52:53,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:52:53,587 INFO L85 PathProgramCache]: Analyzing trace with hash 1970710803, now seen corresponding path program 1 times [2021-11-09 09:52:53,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:52:53,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287478049] [2021-11-09 09:52:53,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:53,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:52:53,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:53,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:52:53,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:53,962 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:52:53,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:54,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:52:54,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:54,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:52:54,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:54,695 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:52:54,696 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:52:54,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287478049] [2021-11-09 09:52:54,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287478049] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:54,696 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597176876] [2021-11-09 09:52:54,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:52:54,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:52:54,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:52:54,699 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:52:54,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-09 09:52:55,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:52:55,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-09 09:52:55,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:52:55,197 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 09:52:55,810 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 09:52:55,825 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 09:52:55,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:52:55,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:52:55,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:52:55,969 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:52:56,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:52:56,229 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 73 treesize of output 75 [2021-11-09 09:52:56,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:52:56,234 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 0 case distinctions, treesize of input 69 treesize of output 58 [2021-11-09 09:52:56,423 INFO L354 Elim1Store]: treesize reduction 120, result has 17.8 percent of original size [2021-11-09 09:52:56,423 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 104 treesize of output 109 [2021-11-09 09:52:56,461 INFO L354 Elim1Store]: treesize reduction 148, result has 18.7 percent of original size [2021-11-09 09:52:56,461 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 6 case distinctions, treesize of input 157 treesize of output 125 [2021-11-09 09:52:56,805 INFO L354 Elim1Store]: treesize reduction 22, result has 40.5 percent of original size [2021-11-09 09:52:56,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 32 treesize of output 34 [2021-11-09 09:52:57,558 INFO L354 Elim1Store]: treesize reduction 183, result has 4.2 percent of original size [2021-11-09 09:52:57,559 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 302 treesize of output 112 [2021-11-09 09:52:58,212 INFO L354 Elim1Store]: treesize reduction 303, result has 9.6 percent of original size [2021-11-09 09:52:58,213 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 21 case distinctions, treesize of input 97 treesize of output 85 [2021-11-09 09:52:58,521 INFO L354 Elim1Store]: treesize reduction 200, result has 18.0 percent of original size [2021-11-09 09:52:58,521 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 8 new quantified variables, introduced 15 case distinctions, treesize of input 77 treesize of output 89 [2021-11-09 09:52:59,116 INFO L354 Elim1Store]: treesize reduction 115, result has 22.8 percent of original size [2021-11-09 09:52:59,116 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 88 treesize of output 82 [2021-11-09 09:52:59,181 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:52:59,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597176876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:52:59,187 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:52:59,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 27] total 51 [2021-11-09 09:52:59,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153040500] [2021-11-09 09:52:59,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-09 09:52:59,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:52:59,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-09 09:52:59,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2492, Unknown=0, NotChecked=0, Total=2652 [2021-11-09 09:52:59,191 INFO L87 Difference]: Start difference. First operand 133 states and 147 transitions. Second operand has 52 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 42 states have internal predecessors, (80), 8 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:53:13,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:13,253 INFO L93 Difference]: Finished difference Result 136 states and 146 transitions. [2021-11-09 09:53:13,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-09 09:53:13,253 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 42 states have internal predecessors, (80), 8 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 55 [2021-11-09 09:53:13,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:13,255 INFO L225 Difference]: With dead ends: 136 [2021-11-09 09:53:13,255 INFO L226 Difference]: Without dead ends: 136 [2021-11-09 09:53:13,257 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 34 SyntacticMatches, 5 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=385, Invalid=4871, Unknown=0, NotChecked=0, Total=5256 [2021-11-09 09:53:13,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-09 09:53:13,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 133. [2021-11-09 09:53:13,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.3061224489795917) internal successors, (128), 118 states have internal predecessors, (128), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:53:13,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 146 transitions. [2021-11-09 09:53:13,264 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 146 transitions. Word has length 55 [2021-11-09 09:53:13,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:13,264 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 146 transitions. [2021-11-09 09:53:13,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 42 states have internal predecessors, (80), 8 states have call successors, (11), 6 states have call predecessors, (11), 6 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:53:13,265 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 146 transitions. [2021-11-09 09:53:13,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-09 09:53:13,266 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:13,266 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:13,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-09 09:53:13,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-09 09:53:13,478 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_circular_remove_firstErr24ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:13,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:13,478 INFO L85 PathProgramCache]: Analyzing trace with hash 962492930, now seen corresponding path program 1 times [2021-11-09 09:53:13,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:13,479 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080891478] [2021-11-09 09:53:13,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:13,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:13,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:14,081 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:14,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:14,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:14,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:15,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:15,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:15,854 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:15,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:16,278 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:53:16,278 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:16,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080891478] [2021-11-09 09:53:16,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080891478] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:16,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181921460] [2021-11-09 09:53:16,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:16,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:16,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:53:16,282 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:53:16,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-09 09:53:16,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:16,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-09 09:53:16,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:53:16,925 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 09:53:17,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 09:53:17,499 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:53:17,499 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 09:53:17,653 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 09:53:17,755 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-09 09:53:17,853 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_circular_create_~head~0.offset] [2021-11-09 09:53:17,853 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:53:17,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2021-11-09 09:53:17,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292409885] [2021-11-09 09:53:17,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-09 09:53:17,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:53:17,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-09 09:53:17,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1543, Unknown=0, NotChecked=0, Total=1640 [2021-11-09 09:53:17,855 INFO L87 Difference]: Start difference. First operand 133 states and 146 transitions. Second operand has 29 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 23 states have internal predecessors, (46), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-09 09:53:21,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:21,298 INFO L93 Difference]: Finished difference Result 135 states and 145 transitions. [2021-11-09 09:53:21,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-09 09:53:21,298 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 23 states have internal predecessors, (46), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 56 [2021-11-09 09:53:21,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:21,299 INFO L225 Difference]: With dead ends: 135 [2021-11-09 09:53:21,299 INFO L226 Difference]: Without dead ends: 135 [2021-11-09 09:53:21,300 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=241, Invalid=3065, Unknown=0, NotChecked=0, Total=3306 [2021-11-09 09:53:21,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-09 09:53:21,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-11-09 09:53:21,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.2959183673469388) internal successors, (127), 118 states have internal predecessors, (127), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:53:21,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 145 transitions. [2021-11-09 09:53:21,306 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 145 transitions. Word has length 56 [2021-11-09 09:53:21,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:21,306 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 145 transitions. [2021-11-09 09:53:21,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 23 states have internal predecessors, (46), 5 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-09 09:53:21,307 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 145 transitions. [2021-11-09 09:53:21,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-09 09:53:21,307 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:21,308 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:21,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-09 09:53:21,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:21,521 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting dll_circular_remove_firstErr25ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:21,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:21,521 INFO L85 PathProgramCache]: Analyzing trace with hash -227490059, now seen corresponding path program 1 times [2021-11-09 09:53:21,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:21,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253074327] [2021-11-09 09:53:21,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:21,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:21,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:22,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:22,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:22,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:22,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:23,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:23,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:23,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:23,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:24,003 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:53:24,003 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:24,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253074327] [2021-11-09 09:53:24,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253074327] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:24,004 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065020839] [2021-11-09 09:53:24,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:24,004 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:24,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:53:24,006 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:53:24,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-09 09:53:24,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:24,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-09 09:53:24,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:53:24,811 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 09:53:25,348 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-09 09:53:25,349 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 09:53:25,561 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 09:53:25,683 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 26 [2021-11-09 09:53:25,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:53:25,921 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 09:53:25,922 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 37 treesize of output 39 [2021-11-09 09:53:26,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:53:26,089 INFO L354 Elim1Store]: treesize reduction 88, result has 14.6 percent of original size [2021-11-09 09:53:26,090 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 5 case distinctions, treesize of input 58 treesize of output 57 [2021-11-09 09:53:27,612 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:53:27,648 INFO L354 Elim1Store]: treesize reduction 150, result has 2.0 percent of original size [2021-11-09 09:53:27,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 20 case distinctions, treesize of input 82 treesize of output 43 [2021-11-09 09:53:27,901 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 0 case distinctions, treesize of input 34 treesize of output 29 [2021-11-09 09:53:28,131 INFO L354 Elim1Store]: treesize reduction 40, result has 36.5 percent of original size [2021-11-09 09:53:28,132 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 47 treesize of output 52 [2021-11-09 09:53:28,445 INFO L354 Elim1Store]: treesize reduction 13, result has 48.0 percent of original size [2021-11-09 09:53:28,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 52 [2021-11-09 09:53:28,712 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:53:28,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065020839] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:28,712 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:53:28,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 28] total 57 [2021-11-09 09:53:28,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339705761] [2021-11-09 09:53:28,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-09 09:53:28,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:53:28,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-09 09:53:28,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3154, Unknown=0, NotChecked=0, Total=3306 [2021-11-09 09:53:28,716 INFO L87 Difference]: Start difference. First operand 133 states and 145 transitions. Second operand has 58 states, 54 states have (on average 1.7222222222222223) internal successors, (93), 47 states have internal predecessors, (93), 8 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:53:44,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:44,859 INFO L93 Difference]: Finished difference Result 133 states and 144 transitions. [2021-11-09 09:53:44,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-09 09:53:44,859 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 54 states have (on average 1.7222222222222223) internal successors, (93), 47 states have internal predecessors, (93), 8 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) Word has length 57 [2021-11-09 09:53:44,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:44,861 INFO L225 Difference]: With dead ends: 133 [2021-11-09 09:53:44,861 INFO L226 Difference]: Without dead ends: 133 [2021-11-09 09:53:44,864 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=387, Invalid=6092, Unknown=1, NotChecked=0, Total=6480 [2021-11-09 09:53:44,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-09 09:53:44,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-11-09 09:53:44,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 98 states have (on average 1.2857142857142858) internal successors, (126), 118 states have internal predecessors, (126), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:53:44,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 144 transitions. [2021-11-09 09:53:44,869 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 144 transitions. Word has length 57 [2021-11-09 09:53:44,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:44,870 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 144 transitions. [2021-11-09 09:53:44,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 54 states have (on average 1.7222222222222223) internal successors, (93), 47 states have internal predecessors, (93), 8 states have call successors, (11), 6 states have call predecessors, (11), 7 states have return successors, (7), 7 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-09 09:53:44,870 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 144 transitions. [2021-11-09 09:53:44,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-09 09:53:44,871 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:44,871 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:44,916 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-09 09:53:45,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:45,098 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting dll_circular_remove_firstErr26REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:45,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:45,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1537742949, now seen corresponding path program 1 times [2021-11-09 09:53:45,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:45,099 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891525887] [2021-11-09 09:53:45,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:45,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:45,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,278 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:45,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,299 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,316 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:45,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,322 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:45,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,328 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:53:45,328 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:45,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891525887] [2021-11-09 09:53:45,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891525887] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:53:45,329 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:53:45,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-09 09:53:45,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158375880] [2021-11-09 09:53:45,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-09 09:53:45,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:53:45,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-09 09:53:45,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:53:45,331 INFO L87 Difference]: Start difference. First operand 133 states and 144 transitions. Second operand has 11 states, 10 states have (on average 4.1) internal successors, (41), 8 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:53:45,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:45,793 INFO L93 Difference]: Finished difference Result 132 states and 142 transitions. [2021-11-09 09:53:45,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 09:53:45,793 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 8 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 58 [2021-11-09 09:53:45,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:45,794 INFO L225 Difference]: With dead ends: 132 [2021-11-09 09:53:45,795 INFO L226 Difference]: Without dead ends: 132 [2021-11-09 09:53:45,795 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:53:45,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-09 09:53:45,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2021-11-09 09:53:45,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 98 states have (on average 1.2653061224489797) internal successors, (124), 117 states have internal predecessors, (124), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:53:45,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 142 transitions. [2021-11-09 09:53:45,801 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 142 transitions. Word has length 58 [2021-11-09 09:53:45,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:45,801 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 142 transitions. [2021-11-09 09:53:45,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.1) internal successors, (41), 8 states have internal predecessors, (41), 2 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-09 09:53:45,802 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 142 transitions. [2021-11-09 09:53:45,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-09 09:53:45,803 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:45,803 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:45,803 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-09 09:53:45,803 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting mainErr0REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:45,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:45,804 INFO L85 PathProgramCache]: Analyzing trace with hash -590443483, now seen corresponding path program 1 times [2021-11-09 09:53:45,804 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:45,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149741210] [2021-11-09 09:53:45,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:45,805 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:45,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:45,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,870 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:45,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:45,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:45,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:53:45,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:45,933 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:53:45,934 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:45,934 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149741210] [2021-11-09 09:53:45,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149741210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:53:45,934 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 09:53:45,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-09 09:53:45,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111283837] [2021-11-09 09:53:45,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:53:45,937 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:53:45,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:53:45,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-09 09:53:45,938 INFO L87 Difference]: Start difference. First operand 132 states and 142 transitions. Second operand has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-09 09:53:46,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:46,339 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2021-11-09 09:53:46,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-09 09:53:46,339 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 58 [2021-11-09 09:53:46,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:46,341 INFO L225 Difference]: With dead ends: 130 [2021-11-09 09:53:46,341 INFO L226 Difference]: Without dead ends: 130 [2021-11-09 09:53:46,341 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:53:46,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-09 09:53:46,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2021-11-09 09:53:46,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 98 states have (on average 1.2346938775510203) internal successors, (121), 115 states have internal predecessors, (121), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 6 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:53:46,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 139 transitions. [2021-11-09 09:53:46,347 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 139 transitions. Word has length 58 [2021-11-09 09:53:46,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:46,347 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 139 transitions. [2021-11-09 09:53:46,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-09 09:53:46,347 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 139 transitions. [2021-11-09 09:53:46,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-09 09:53:46,348 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:46,348 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:46,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-09 09:53:46,348 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:46,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:46,349 INFO L85 PathProgramCache]: Analyzing trace with hash -480501944, now seen corresponding path program 1 times [2021-11-09 09:53:46,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:46,349 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085554801] [2021-11-09 09:53:46,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:46,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:46,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:46,436 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:46,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:46,454 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:46,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:46,471 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:46,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:46,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:46,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:46,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:53:46,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:46,501 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:53:46,501 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:46,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085554801] [2021-11-09 09:53:46,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085554801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:46,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425971890] [2021-11-09 09:53:46,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:46,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:46,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:53:46,506 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:53:46,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-09 09:53:47,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:47,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-09 09:53:47,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:53:47,633 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:53:47,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425971890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:47,633 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:53:47,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-11-09 09:53:47,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824547546] [2021-11-09 09:53:47,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-09 09:53:47,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:53:47,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-09 09:53:47,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-11-09 09:53:47,635 INFO L87 Difference]: Start difference. First operand 130 states and 139 transitions. Second operand has 11 states, 11 states have (on average 4.636363636363637) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (11), 4 states have call predecessors, (11), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-09 09:53:47,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:47,847 INFO L93 Difference]: Finished difference Result 134 states and 143 transitions. [2021-11-09 09:53:47,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-09 09:53:47,847 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.636363636363637) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (11), 4 states have call predecessors, (11), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 60 [2021-11-09 09:53:47,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:47,849 INFO L225 Difference]: With dead ends: 134 [2021-11-09 09:53:47,849 INFO L226 Difference]: Without dead ends: 134 [2021-11-09 09:53:47,849 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-11-09 09:53:47,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-09 09:53:47,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-11-09 09:53:47,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 102 states have (on average 1.2254901960784315) internal successors, (125), 117 states have internal predecessors, (125), 8 states have call successors, (8), 8 states have call predecessors, (8), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-09 09:53:47,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 143 transitions. [2021-11-09 09:53:47,854 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 143 transitions. Word has length 60 [2021-11-09 09:53:47,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:47,855 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 143 transitions. [2021-11-09 09:53:47,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.636363636363637) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (11), 4 states have call predecessors, (11), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-09 09:53:47,855 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 143 transitions. [2021-11-09 09:53:47,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-09 09:53:47,856 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:47,856 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:47,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-09 09:53:48,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-09 09:53:48,082 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_circular_remove_firstErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:48,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:48,082 INFO L85 PathProgramCache]: Analyzing trace with hash -2006421094, now seen corresponding path program 1 times [2021-11-09 09:53:48,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:48,082 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567019232] [2021-11-09 09:53:48,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:48,083 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:48,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:48,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:48,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:48,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:48,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:48,378 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:48,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:48,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:48,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:48,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:53:48,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:48,848 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:53:48,848 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:48,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567019232] [2021-11-09 09:53:48,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567019232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:48,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784777541] [2021-11-09 09:53:48,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:48,849 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:48,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:53:48,857 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:53:48,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-09 09:53:49,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:49,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-09 09:53:49,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:53:49,577 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 09:53:49,807 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:53:49,807 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 09:53:49,842 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 09:53:49,888 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-09 09:53:50,023 INFO L354 Elim1Store]: treesize reduction 60, result has 22.1 percent of original size [2021-11-09 09:53:50,024 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 44 treesize of output 37 [2021-11-09 09:53:50,085 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_circular_create_~head~0.offset] [2021-11-09 09:53:50,085 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:53:50,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2021-11-09 09:53:50,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930610048] [2021-11-09 09:53:50,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-09 09:53:50,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:53:50,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-09 09:53:50,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=1239, Unknown=0, NotChecked=0, Total=1332 [2021-11-09 09:53:50,087 INFO L87 Difference]: Start difference. First operand 134 states and 143 transitions. Second operand has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 24 states have internal predecessors, (49), 4 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:53:51,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:53:51,525 INFO L93 Difference]: Finished difference Result 116 states and 117 transitions. [2021-11-09 09:53:51,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-09 09:53:51,525 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 24 states have internal predecessors, (49), 4 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 61 [2021-11-09 09:53:51,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:53:51,526 INFO L225 Difference]: With dead ends: 116 [2021-11-09 09:53:51,527 INFO L226 Difference]: Without dead ends: 109 [2021-11-09 09:53:51,528 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=242, Invalid=2514, Unknown=0, NotChecked=0, Total=2756 [2021-11-09 09:53:51,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-09 09:53:51,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-11-09 09:53:51,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 79 states have (on average 1.2025316455696202) internal successors, (95), 93 states have internal predecessors, (95), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-09 09:53:51,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2021-11-09 09:53:51,532 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 61 [2021-11-09 09:53:51,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:53:51,532 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2021-11-09 09:53:51,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 24 states have internal predecessors, (49), 4 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:53:51,533 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2021-11-09 09:53:51,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-09 09:53:51,534 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:53:51,534 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:53:51,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-09 09:53:51,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:51,754 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting dll_circular_remove_firstErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:53:51,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:53:51,754 INFO L85 PathProgramCache]: Analyzing trace with hash -1824649007, now seen corresponding path program 1 times [2021-11-09 09:53:51,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:53:51,755 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705186357] [2021-11-09 09:53:51,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:51,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:53:51,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:51,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:53:51,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:51,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:53:51,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:52,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:53:52,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:52,336 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:53:52,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:52,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:53:52,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:53,993 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:53:53,993 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:53:53,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705186357] [2021-11-09 09:53:53,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705186357] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:53:53,994 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531696029] [2021-11-09 09:53:53,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:53:53,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:53:53,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:53:53,995 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:53:53,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-09 09:53:54,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:53:54,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-09 09:53:54,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:53:54,780 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 09:53:55,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 09:53:55,202 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:53:55,203 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 09:53:55,339 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 18 treesize of output 14 [2021-11-09 09:53:55,465 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 0 case distinctions, treesize of input 27 treesize of output 26 [2021-11-09 09:53:55,726 INFO L354 Elim1Store]: treesize reduction 60, result has 22.1 percent of original size [2021-11-09 09:53:55,727 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 50 treesize of output 43 [2021-11-09 09:53:55,858 INFO L354 Elim1Store]: treesize reduction 76, result has 18.3 percent of original size [2021-11-09 09:53:55,859 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 55 treesize of output 48 [2021-11-09 09:54:15,586 INFO L354 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2021-11-09 09:54:15,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 16 treesize of output 26 [2021-11-09 09:54:21,462 INFO L354 Elim1Store]: treesize reduction 717, result has 13.5 percent of original size [2021-11-09 09:54:21,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 16 case distinctions, treesize of input 662 treesize of output 334 [2021-11-09 09:54:21,482 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 399 treesize of output 379 [2021-11-09 09:55:19,809 INFO L354 Elim1Store]: treesize reduction 220, result has 20.6 percent of original size [2021-11-09 09:55:19,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 21 case distinctions, treesize of input 197 treesize of output 182 [2021-11-09 09:55:21,835 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:55:21,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531696029] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:55:21,835 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:55:21,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 36] total 70 [2021-11-09 09:55:21,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390458632] [2021-11-09 09:55:21,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-09 09:55:21,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:55:21,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-09 09:55:21,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=4772, Unknown=6, NotChecked=0, Total=4970 [2021-11-09 09:55:21,840 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 71 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 58 states have internal predecessors, (100), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-09 09:56:02,939 WARN L207 SmtUtils]: Spent 14.68 s on a formula simplification. DAG size of input: 139 DAG size of output: 134 [2021-11-09 09:56:34,884 WARN L207 SmtUtils]: Spent 25.01 s on a formula simplification. DAG size of input: 142 DAG size of output: 137 [2021-11-09 09:57:57,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:57:57,173 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2021-11-09 09:57:57,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-09 09:57:57,174 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 58 states have internal predecessors, (100), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) Word has length 66 [2021-11-09 09:57:57,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:57:57,175 INFO L225 Difference]: With dead ends: 130 [2021-11-09 09:57:57,175 INFO L226 Difference]: Without dead ends: 130 [2021-11-09 09:57:57,178 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2307 ImplicationChecksByTransitivity, 139.8s TimeCoverageRelationStatistics Valid=782, Invalid=12543, Unknown=15, NotChecked=0, Total=13340 [2021-11-09 09:57:57,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-09 09:57:57,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 111. [2021-11-09 09:57:57,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 82 states have (on average 1.2073170731707317) internal successors, (99), 96 states have internal predecessors, (99), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-09 09:57:57,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2021-11-09 09:57:57,183 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 66 [2021-11-09 09:57:57,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:57:57,183 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2021-11-09 09:57:57,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 58 states have internal predecessors, (100), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-09 09:57:57,184 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2021-11-09 09:57:57,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-09 09:57:57,185 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:57:57,185 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:57:57,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-09 09:57:57,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:57:57,410 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting dll_circular_remove_firstErr3REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:57:57,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:57:57,410 INFO L85 PathProgramCache]: Analyzing trace with hash -1824649006, now seen corresponding path program 1 times [2021-11-09 09:57:57,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:57:57,410 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198254186] [2021-11-09 09:57:57,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:57:57,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:57:57,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:57:57,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:57:57,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:57:57,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:57:57,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:57:58,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:57:58,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:57:58,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:57:58,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:57:58,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:57:58,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:57:59,350 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:57:59,350 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:57:59,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198254186] [2021-11-09 09:57:59,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198254186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:57:59,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292613654] [2021-11-09 09:57:59,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:57:59,352 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:57:59,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:57:59,370 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:57:59,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-09 09:58:00,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:00,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-09 09:58:00,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:58:00,329 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 09:58:01,180 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:58:01,181 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 09:58:01,440 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 09:58:01,613 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 26 [2021-11-09 09:58:01,924 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 09:58:01,924 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 30 treesize of output 32 [2021-11-09 09:58:02,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:58:02,091 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:58:02,106 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 09:58:02,106 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 4 case distinctions, treesize of input 39 treesize of output 44 [2021-11-09 09:58:04,047 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 31 treesize of output 27 [2021-11-09 09:58:04,056 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 23 treesize of output 19 [2021-11-09 09:58:04,260 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 111 treesize of output 91 [2021-11-09 09:58:04,294 INFO L354 Elim1Store]: treesize reduction 118, result has 2.5 percent of original size [2021-11-09 09:58:04,294 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 8 new quantified variables, introduced 15 case distinctions, treesize of input 91 treesize of output 52 [2021-11-09 09:58:04,789 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 37 treesize of output 29 [2021-11-09 09:58:04,793 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 26 treesize of output 14 [2021-11-09 09:58:04,923 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:58:04,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292613654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:04,924 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:58:04,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 59 [2021-11-09 09:58:04,924 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899553209] [2021-11-09 09:58:04,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-09 09:58:04,925 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:58:04,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-09 09:58:04,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=3368, Unknown=0, NotChecked=0, Total=3540 [2021-11-09 09:58:04,926 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 60 states, 58 states have (on average 1.8448275862068966) internal successors, (107), 47 states have internal predecessors, (107), 8 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-09 09:58:12,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:58:12,431 INFO L93 Difference]: Finished difference Result 133 states and 136 transitions. [2021-11-09 09:58:12,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-09 09:58:12,432 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 58 states have (on average 1.8448275862068966) internal successors, (107), 47 states have internal predecessors, (107), 8 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) Word has length 66 [2021-11-09 09:58:12,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:58:12,433 INFO L225 Difference]: With dead ends: 133 [2021-11-09 09:58:12,433 INFO L226 Difference]: Without dead ends: 133 [2021-11-09 09:58:12,434 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1289 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=445, Invalid=6361, Unknown=0, NotChecked=0, Total=6806 [2021-11-09 09:58:12,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-09 09:58:12,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 123. [2021-11-09 09:58:12,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 92 states have (on average 1.2173913043478262) internal successors, (112), 108 states have internal predecessors, (112), 8 states have call successors, (8), 8 states have call predecessors, (8), 8 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-09 09:58:12,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 129 transitions. [2021-11-09 09:58:12,440 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 129 transitions. Word has length 66 [2021-11-09 09:58:12,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:58:12,440 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 129 transitions. [2021-11-09 09:58:12,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 58 states have (on average 1.8448275862068966) internal successors, (107), 47 states have internal predecessors, (107), 8 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-09 09:58:12,441 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 129 transitions. [2021-11-09 09:58:12,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-09 09:58:12,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:58:12,442 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:58:12,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-09 09:58:12,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:58:12,650 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting dll_circular_remove_firstErr16REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:58:12,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:58:12,650 INFO L85 PathProgramCache]: Analyzing trace with hash 2051868663, now seen corresponding path program 1 times [2021-11-09 09:58:12,650 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:58:12,651 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347752764] [2021-11-09 09:58:12,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:12,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:58:12,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:12,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:58:12,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:12,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:58:12,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:12,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:58:12,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:12,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:58:12,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:13,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:58:13,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:13,179 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:58:13,179 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:58:13,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347752764] [2021-11-09 09:58:13,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347752764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:13,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105304853] [2021-11-09 09:58:13,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:13,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:58:13,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:58:13,181 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:58:13,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-09 09:58:14,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:14,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-09 09:58:14,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:58:14,422 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 30 treesize of output 26 [2021-11-09 09:58:14,426 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 23 treesize of output 19 [2021-11-09 09:58:14,871 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 37 treesize of output 29 [2021-11-09 09:58:14,874 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 26 treesize of output 14 [2021-11-09 09:58:14,882 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-09 09:58:14,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105304853] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:14,883 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:58:14,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 18 [2021-11-09 09:58:14,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710375417] [2021-11-09 09:58:14,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-09 09:58:14,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:58:14,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-09 09:58:14,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2021-11-09 09:58:14,885 INFO L87 Difference]: Start difference. First operand 123 states and 129 transitions. Second operand has 19 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 15 states have internal predecessors, (68), 4 states have call successors, (13), 6 states have call predecessors, (13), 2 states have return successors, (7), 4 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-09 09:58:17,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:58:17,098 INFO L93 Difference]: Finished difference Result 152 states and 162 transitions. [2021-11-09 09:58:17,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-09 09:58:17,099 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 15 states have internal predecessors, (68), 4 states have call successors, (13), 6 states have call predecessors, (13), 2 states have return successors, (7), 4 states have call predecessors, (7), 2 states have call successors, (7) Word has length 71 [2021-11-09 09:58:17,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:58:17,100 INFO L225 Difference]: With dead ends: 152 [2021-11-09 09:58:17,100 INFO L226 Difference]: Without dead ends: 152 [2021-11-09 09:58:17,100 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2021-11-09 09:58:17,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-09 09:58:17,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 134. [2021-11-09 09:58:17,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 102 states have (on average 1.2352941176470589) internal successors, (126), 117 states have internal predecessors, (126), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-09 09:58:17,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2021-11-09 09:58:17,105 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 71 [2021-11-09 09:58:17,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:58:17,106 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2021-11-09 09:58:17,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 15 states have internal predecessors, (68), 4 states have call successors, (13), 6 states have call predecessors, (13), 2 states have return successors, (7), 4 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-09 09:58:17,107 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2021-11-09 09:58:17,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-09 09:58:17,107 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:58:17,108 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:58:17,161 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-09 09:58:17,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-09 09:58:17,334 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting dll_circular_remove_firstErr8ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:58:17,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:58:17,334 INFO L85 PathProgramCache]: Analyzing trace with hash 2051854759, now seen corresponding path program 1 times [2021-11-09 09:58:17,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:58:17,335 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102679757] [2021-11-09 09:58:17,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:17,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:58:17,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:17,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:58:17,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:17,623 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:58:17,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:18,200 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:58:18,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:18,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:58:18,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:18,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:58:18,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:19,377 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:58:19,377 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:58:19,377 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102679757] [2021-11-09 09:58:19,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102679757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:19,377 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107151591] [2021-11-09 09:58:19,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:19,377 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:58:19,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:58:19,379 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:58:19,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-09 09:58:20,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:20,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-09 09:58:20,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:58:20,461 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 09:58:21,268 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:58:21,269 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 09:58:21,521 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 09:58:21,704 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:58:22,089 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-09 09:58:22,090 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 30 treesize of output 32 [2021-11-09 09:58:22,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:58:22,331 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:58:22,354 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 09:58:22,354 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 4 case distinctions, treesize of input 39 treesize of output 44 [2021-11-09 09:58:24,002 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 23 treesize of output 19 [2021-11-09 09:58:24,031 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 81 treesize of output 65 [2021-11-09 09:58:24,063 INFO L354 Elim1Store]: treesize reduction 118, result has 2.5 percent of original size [2021-11-09 09:58:24,063 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 8 new quantified variables, introduced 15 case distinctions, treesize of input 65 treesize of output 38 [2021-11-09 09:58:24,497 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 15 treesize of output 7 [2021-11-09 09:58:24,502 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:58:24,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107151591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:24,502 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:58:24,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 55 [2021-11-09 09:58:24,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857212161] [2021-11-09 09:58:24,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-09 09:58:24,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:58:24,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-09 09:58:24,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=2915, Unknown=0, NotChecked=0, Total=3080 [2021-11-09 09:58:24,505 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand has 56 states, 54 states have (on average 2.0185185185185186) internal successors, (109), 43 states have internal predecessors, (109), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-09 09:58:31,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:58:31,716 INFO L93 Difference]: Finished difference Result 155 states and 163 transitions. [2021-11-09 09:58:31,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-09 09:58:31,717 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 54 states have (on average 2.0185185185185186) internal successors, (109), 43 states have internal predecessors, (109), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) Word has length 71 [2021-11-09 09:58:31,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:58:31,718 INFO L225 Difference]: With dead ends: 155 [2021-11-09 09:58:31,718 INFO L226 Difference]: Without dead ends: 155 [2021-11-09 09:58:31,719 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1662 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=612, Invalid=7220, Unknown=0, NotChecked=0, Total=7832 [2021-11-09 09:58:31,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-09 09:58:31,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 141. [2021-11-09 09:58:31,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 108 states have (on average 1.2314814814814814) internal successors, (133), 124 states have internal predecessors, (133), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-09 09:58:31,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 153 transitions. [2021-11-09 09:58:31,725 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 153 transitions. Word has length 71 [2021-11-09 09:58:31,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:58:31,725 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 153 transitions. [2021-11-09 09:58:31,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 54 states have (on average 2.0185185185185186) internal successors, (109), 43 states have internal predecessors, (109), 8 states have call successors, (13), 8 states have call predecessors, (13), 8 states have return successors, (9), 9 states have call predecessors, (9), 6 states have call successors, (9) [2021-11-09 09:58:31,726 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 153 transitions. [2021-11-09 09:58:31,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-09 09:58:31,727 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:58:31,727 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:58:31,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-09 09:58:31,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-09 09:58:31,942 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting dll_circular_remove_firstErr9ASSERT_VIOLATIONMEMORY_FREE === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:58:31,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:58:31,942 INFO L85 PathProgramCache]: Analyzing trace with hash -817011757, now seen corresponding path program 1 times [2021-11-09 09:58:31,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:58:31,943 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114946131] [2021-11-09 09:58:31,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:31,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:58:31,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:32,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:58:32,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:32,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:58:32,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:32,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:58:32,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:33,176 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:58:33,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:33,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:58:33,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:34,521 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:58:34,521 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:58:34,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114946131] [2021-11-09 09:58:34,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114946131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:34,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666154914] [2021-11-09 09:58:34,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:34,522 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:58:34,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:58:34,523 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:58:34,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-09 09:58:35,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:35,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-09 09:58:35,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:58:35,914 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 09:58:36,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-11-09 09:58:36,532 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:58:36,532 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 09:58:36,841 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 09:58:37,044 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 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-09 09:58:37,216 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [dll_circular_create_~head~0.offset] [2021-11-09 09:58:37,216 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:58:37,216 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2021-11-09 09:58:37,216 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110772170] [2021-11-09 09:58:37,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-09 09:58:37,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:58:37,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-09 09:58:37,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1315, Unknown=0, NotChecked=0, Total=1406 [2021-11-09 09:58:37,218 INFO L87 Difference]: Start difference. First operand 141 states and 153 transitions. Second operand has 31 states, 30 states have (on average 2.0) internal successors, (60), 24 states have internal predecessors, (60), 4 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:58:42,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:58:42,542 INFO L93 Difference]: Finished difference Result 148 states and 158 transitions. [2021-11-09 09:58:42,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-09 09:58:42,542 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.0) internal successors, (60), 24 states have internal predecessors, (60), 4 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 72 [2021-11-09 09:58:42,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:58:42,544 INFO L225 Difference]: With dead ends: 148 [2021-11-09 09:58:42,544 INFO L226 Difference]: Without dead ends: 148 [2021-11-09 09:58:42,545 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=300, Invalid=3240, Unknown=0, NotChecked=0, Total=3540 [2021-11-09 09:58:42,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-09 09:58:42,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2021-11-09 09:58:42,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 108 states have (on average 1.2222222222222223) internal successors, (132), 124 states have internal predecessors, (132), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-09 09:58:42,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2021-11-09 09:58:42,550 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 72 [2021-11-09 09:58:42,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:58:42,551 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2021-11-09 09:58:42,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.0) internal successors, (60), 24 states have internal predecessors, (60), 4 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-09 09:58:42,551 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2021-11-09 09:58:42,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-09 09:58:42,552 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:58:42,552 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:58:42,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-09 09:58:42,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-09 09:58:42,774 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting dll_circular_remove_firstErr17REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:58:42,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:58:42,774 INFO L85 PathProgramCache]: Analyzing trace with hash 455798775, now seen corresponding path program 1 times [2021-11-09 09:58:42,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:58:42,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910536356] [2021-11-09 09:58:42,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:42,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:58:42,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:43,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:58:43,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:43,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:58:43,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:45,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:58:45,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:46,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:58:46,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:47,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:58:47,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:50,234 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-09 09:58:50,234 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:58:50,234 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910536356] [2021-11-09 09:58:50,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910536356] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:50,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337146547] [2021-11-09 09:58:50,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:58:50,235 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:58:50,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:58:50,236 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:58:50,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-09 09:58:51,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:58:51,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-09 09:58:51,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:58:51,445 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 09:58:52,561 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-09 09:58:52,562 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 09:58:52,917 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 09:58:52,939 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 09:58:53,176 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:58:53,188 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:58:53,644 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 26 treesize of output 28 [2021-11-09 09:58:53,670 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 26 treesize of output 28 [2021-11-09 09:58:53,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:58:53,909 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:58:53,925 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 09:58:53,925 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 4 case distinctions, treesize of input 90 treesize of output 78 [2021-11-09 09:58:53,931 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:58:53,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:58:53,955 INFO L354 Elim1Store]: treesize reduction 41, result has 21.2 percent of original size [2021-11-09 09:58:53,956 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 4 case distinctions, treesize of input 86 treesize of output 91 [2021-11-09 09:58:56,792 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 53 treesize of output 35 [2021-11-09 09:58:57,116 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 23 treesize of output 19 [2021-11-09 09:58:57,167 INFO L354 Elim1Store]: treesize reduction 121, result has 22.4 percent of original size [2021-11-09 09:58:57,168 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 71 treesize of output 70 [2021-11-09 09:58:57,476 INFO L354 Elim1Store]: treesize reduction 194, result has 5.4 percent of original size [2021-11-09 09:58:57,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 218 treesize of output 104 [2021-11-09 09:58:57,534 INFO L354 Elim1Store]: treesize reduction 166, result has 4.0 percent of original size [2021-11-09 09:58:57,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 96 treesize of output 64 [2021-11-09 09:58:58,180 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-09 09:58:58,867 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-09 09:58:58,867 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 36 treesize of output 15 [2021-11-09 09:58:58,881 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-09 09:58:58,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337146547] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:58:58,881 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:58:58,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 36] total 73 [2021-11-09 09:58:58,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839377965] [2021-11-09 09:58:58,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-09 09:58:58,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:58:58,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-09 09:58:58,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=5192, Unknown=0, NotChecked=0, Total=5402 [2021-11-09 09:58:58,884 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand has 74 states, 70 states have (on average 1.6571428571428573) internal successors, (116), 61 states have internal predecessors, (116), 10 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-09 09:59:17,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:59:17,073 INFO L93 Difference]: Finished difference Result 147 states and 157 transitions. [2021-11-09 09:59:17,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-09 09:59:17,074 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 70 states have (on average 1.6571428571428573) internal successors, (116), 61 states have internal predecessors, (116), 10 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) Word has length 73 [2021-11-09 09:59:17,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:59:17,075 INFO L225 Difference]: With dead ends: 147 [2021-11-09 09:59:17,075 INFO L226 Difference]: Without dead ends: 147 [2021-11-09 09:59:17,077 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2342 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=791, Invalid=12319, Unknown=0, NotChecked=0, Total=13110 [2021-11-09 09:59:17,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-09 09:59:17,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 145. [2021-11-09 09:59:17,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 112 states have (on average 1.2232142857142858) internal successors, (137), 128 states have internal predecessors, (137), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (11), 7 states have call predecessors, (11), 8 states have call successors, (11) [2021-11-09 09:59:17,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 157 transitions. [2021-11-09 09:59:17,083 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 157 transitions. Word has length 73 [2021-11-09 09:59:17,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:59:17,083 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 157 transitions. [2021-11-09 09:59:17,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 70 states have (on average 1.6571428571428573) internal successors, (116), 61 states have internal predecessors, (116), 10 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-09 09:59:17,084 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 157 transitions. [2021-11-09 09:59:17,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-09 09:59:17,085 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:59:17,085 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 09:59:17,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-09 09:59:17,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:59:17,302 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting dll_circular_remove_firstErr18REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:59:17,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:59:17,302 INFO L85 PathProgramCache]: Analyzing trace with hash 455798776, now seen corresponding path program 1 times [2021-11-09 09:59:17,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:59:17,303 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238896526] [2021-11-09 09:59:17,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:59:17,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:59:17,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:18,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:59:18,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:18,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:59:18,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:19,398 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:59:19,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:19,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:59:19,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:20,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:59:20,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:22,677 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:59:22,677 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:59:22,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238896526] [2021-11-09 09:59:22,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238896526] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:59:22,678 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592527673] [2021-11-09 09:59:22,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:59:22,678 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:59:22,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:59:22,680 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:59:22,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-09 09:59:23,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:23,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 143 conjunts are in the unsatisfiable core [2021-11-09 09:59:23,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:59:24,006 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 09:59:25,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 09:59:25,497 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 09:59:25,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:59:25,743 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:59:25,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:59:25,758 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 09:59:26,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:59:26,264 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 26 treesize of output 28 [2021-11-09 09:59:26,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:59:26,289 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 26 treesize of output 28 [2021-11-09 09:59:26,557 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:59:26,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:59:26,581 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 09:59:26,581 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 4 case distinctions, treesize of input 103 treesize of output 87 [2021-11-09 09:59:26,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 09:59:26,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 09:59:26,609 INFO L354 Elim1Store]: treesize reduction 41, result has 21.2 percent of original size [2021-11-09 09:59:26,610 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 4 case distinctions, treesize of input 99 treesize of output 104 [2021-11-09 09:59:27,242 INFO L354 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2021-11-09 09:59:27,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 28 treesize of output 30 [2021-11-09 09:59:28,832 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 53 treesize of output 35 [2021-11-09 09:59:28,849 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 53 treesize of output 35 [2021-11-09 09:59:29,241 INFO L354 Elim1Store]: treesize reduction 121, result has 22.4 percent of original size [2021-11-09 09:59:29,241 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 71 treesize of output 70 [2021-11-09 09:59:29,280 INFO L354 Elim1Store]: treesize reduction 109, result has 24.3 percent of original size [2021-11-09 09:59:29,280 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 91 treesize of output 58 [2021-11-09 09:59:29,588 INFO L354 Elim1Store]: treesize reduction 194, result has 5.4 percent of original size [2021-11-09 09:59:29,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 269 treesize of output 129 [2021-11-09 09:59:29,638 INFO L354 Elim1Store]: treesize reduction 166, result has 4.0 percent of original size [2021-11-09 09:59:29,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 129 treesize of output 87 [2021-11-09 09:59:31,048 INFO L354 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2021-11-09 09:59:31,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 30 [2021-11-09 09:59:31,282 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-09 09:59:31,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592527673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:59:31,282 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 09:59:31,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 37] total 70 [2021-11-09 09:59:31,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013491612] [2021-11-09 09:59:31,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-09 09:59:31,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:59:31,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-09 09:59:31,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=4639, Unknown=0, NotChecked=0, Total=4830 [2021-11-09 09:59:31,284 INFO L87 Difference]: Start difference. First operand 145 states and 157 transitions. Second operand has 70 states, 68 states have (on average 1.7205882352941178) internal successors, (117), 58 states have internal predecessors, (117), 10 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-09 09:59:48,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:59:48,758 INFO L93 Difference]: Finished difference Result 142 states and 150 transitions. [2021-11-09 09:59:48,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-09 09:59:48,759 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 68 states have (on average 1.7205882352941178) internal successors, (117), 58 states have internal predecessors, (117), 10 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) Word has length 73 [2021-11-09 09:59:48,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:59:48,760 INFO L225 Difference]: With dead ends: 142 [2021-11-09 09:59:48,760 INFO L226 Difference]: Without dead ends: 142 [2021-11-09 09:59:48,761 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2053 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=591, Invalid=10329, Unknown=0, NotChecked=0, Total=10920 [2021-11-09 09:59:48,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-09 09:59:48,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2021-11-09 09:59:48,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 108 states have (on average 1.212962962962963) internal successors, (131), 124 states have internal predecessors, (131), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-09 09:59:48,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 150 transitions. [2021-11-09 09:59:48,766 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 150 transitions. Word has length 73 [2021-11-09 09:59:48,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:59:48,766 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 150 transitions. [2021-11-09 09:59:48,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 68 states have (on average 1.7205882352941178) internal successors, (117), 58 states have internal predecessors, (117), 10 states have call successors, (13), 8 states have call predecessors, (13), 9 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-09 09:59:48,767 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 150 transitions. [2021-11-09 09:59:48,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-09 09:59:48,768 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:59:48,768 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 09:59:48,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-09 09:59:48,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-09 09:59:48,994 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting dll_circular_remove_firstErr11REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:59:48,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:59:48,995 INFO L85 PathProgramCache]: Analyzing trace with hash 830721686, now seen corresponding path program 1 times [2021-11-09 09:59:48,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:59:48,995 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419327805] [2021-11-09 09:59:48,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:59:48,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:59:49,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:49,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:59:49,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:49,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:59:49,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:49,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:59:49,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:49,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:59:49,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:49,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:59:49,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:49,480 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-09 09:59:49,480 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:59:49,480 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419327805] [2021-11-09 09:59:49,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419327805] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:59:49,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419272448] [2021-11-09 09:59:49,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:59:49,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:59:49,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:59:49,482 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:59:49,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-09 09:59:50,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:50,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-09 09:59:50,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 09:59:51,162 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-09 09:59:51,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 19 [2021-11-09 09:59:51,212 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-09 09:59:51,213 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1419272448] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 09:59:51,213 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-09 09:59:51,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 13 [2021-11-09 09:59:51,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991114482] [2021-11-09 09:59:51,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-09 09:59:51,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 09:59:51,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-09 09:59:51,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-11-09 09:59:51,216 INFO L87 Difference]: Start difference. First operand 141 states and 150 transitions. Second operand has 8 states, 7 states have (on average 7.714285714285714) internal successors, (54), 7 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-09 09:59:51,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 09:59:51,639 INFO L93 Difference]: Finished difference Result 140 states and 147 transitions. [2021-11-09 09:59:51,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-09 09:59:51,640 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.714285714285714) internal successors, (54), 7 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 74 [2021-11-09 09:59:51,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 09:59:51,641 INFO L225 Difference]: With dead ends: 140 [2021-11-09 09:59:51,641 INFO L226 Difference]: Without dead ends: 140 [2021-11-09 09:59:51,642 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-11-09 09:59:51,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-09 09:59:51,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2021-11-09 09:59:51,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 108 states have (on average 1.1851851851851851) internal successors, (128), 123 states have internal predecessors, (128), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-09 09:59:51,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 147 transitions. [2021-11-09 09:59:51,648 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 147 transitions. Word has length 74 [2021-11-09 09:59:51,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 09:59:51,648 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 147 transitions. [2021-11-09 09:59:51,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.714285714285714) internal successors, (54), 7 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-09 09:59:51,649 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 147 transitions. [2021-11-09 09:59:51,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-09 09:59:51,650 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 09:59:51,650 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 09:59:51,702 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-09 09:59:51,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-09 09:59:51,878 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 09:59:51,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 09:59:51,878 INFO L85 PathProgramCache]: Analyzing trace with hash 470769120, now seen corresponding path program 1 times [2021-11-09 09:59:51,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 09:59:51,879 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183575876] [2021-11-09 09:59:51,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:59:51,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 09:59:51,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:52,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 09:59:52,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:52,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 09:59:52,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:53,546 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 09:59:53,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:53,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 09:59:53,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:54,169 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 09:59:54,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:58,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-11-09 09:59:58,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 09:59:59,736 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-09 09:59:59,736 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 09:59:59,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [183575876] [2021-11-09 09:59:59,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [183575876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 09:59:59,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1518921271] [2021-11-09 09:59:59,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 09:59:59,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 09:59:59,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 09:59:59,738 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 09:59:59,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-09 10:00:01,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:00:01,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 144 conjunts are in the unsatisfiable core [2021-11-09 10:00:01,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:00:01,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 10:00:02,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-11-09 10:00:03,196 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 10:00:03,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:00:03,494 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 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-09 10:00:03,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:00:03,972 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 26 treesize of output 28 [2021-11-09 10:00:04,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-09 10:00:04,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-09 10:00:04,247 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-09 10:00:04,247 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 4 new quantified variables, introduced 4 case distinctions, treesize of input 81 treesize of output 65 [2021-11-09 10:00:18,069 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 338 treesize of output 334 [2021-11-09 10:00:18,966 INFO L354 Elim1Store]: treesize reduction 657, result has 11.3 percent of original size [2021-11-09 10:00:18,966 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 22 case distinctions, treesize of input 593 treesize of output 285 [2021-11-09 10:00:18,982 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 432 treesize of output 424 [2021-11-09 10:00:48,229 INFO L354 Elim1Store]: treesize reduction 258, result has 1.1 percent of original size [2021-11-09 10:00:48,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 10 new quantified variables, introduced 21 case distinctions, treesize of input 256 treesize of output 128 [2021-11-09 10:00:48,248 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 104 treesize of output 100 [2021-11-09 10:00:49,237 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-09 10:00:49,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1518921271] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:00:49,237 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-09 10:00:49,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 39] total 77 [2021-11-09 10:00:49,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641314015] [2021-11-09 10:00:49,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-09 10:00:49,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:00:49,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-09 10:00:49,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=5719, Unknown=2, NotChecked=0, Total=6006 [2021-11-09 10:00:49,240 INFO L87 Difference]: Start difference. First operand 140 states and 147 transitions. Second operand has 78 states, 76 states have (on average 1.5263157894736843) internal successors, (116), 68 states have internal predecessors, (116), 10 states have call successors, (13), 6 states have call predecessors, (13), 9 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-09 10:01:38,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:01:38,455 INFO L93 Difference]: Finished difference Result 148 states and 157 transitions. [2021-11-09 10:01:38,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-09 10:01:38,456 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 76 states have (on average 1.5263157894736843) internal successors, (116), 68 states have internal predecessors, (116), 10 states have call successors, (13), 6 states have call predecessors, (13), 9 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) Word has length 81 [2021-11-09 10:01:38,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:01:38,458 INFO L225 Difference]: With dead ends: 148 [2021-11-09 10:01:38,458 INFO L226 Difference]: Without dead ends: 147 [2021-11-09 10:01:38,459 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2844 ImplicationChecksByTransitivity, 43.4s TimeCoverageRelationStatistics Valid=560, Invalid=9334, Unknown=6, NotChecked=0, Total=9900 [2021-11-09 10:01:38,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-09 10:01:38,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2021-11-09 10:01:38,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 112 states have (on average 1.1875) internal successors, (133), 126 states have internal predecessors, (133), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-09 10:01:38,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 152 transitions. [2021-11-09 10:01:38,465 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 152 transitions. Word has length 81 [2021-11-09 10:01:38,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:01:38,466 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 152 transitions. [2021-11-09 10:01:38,466 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 76 states have (on average 1.5263157894736843) internal successors, (116), 68 states have internal predecessors, (116), 10 states have call successors, (13), 6 states have call predecessors, (13), 9 states have return successors, (11), 11 states have call predecessors, (11), 10 states have call successors, (11) [2021-11-09 10:01:38,466 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 152 transitions. [2021-11-09 10:01:38,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-09 10:01:38,467 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:01:38,467 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 10:01:38,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-09 10:01:38,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:01:38,682 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 10:01:38,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:01:38,682 INFO L85 PathProgramCache]: Analyzing trace with hash 470769055, now seen corresponding path program 1 times [2021-11-09 10:01:38,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:01:38,682 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739818072] [2021-11-09 10:01:38,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:01:38,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:01:38,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:38,832 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 10:01:38,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:38,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 10:01:38,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:38,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 10:01:38,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:38,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 10:01:38,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:38,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 10:01:38,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:38,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-11-09 10:01:38,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:39,011 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-09 10:01:39,012 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:01:39,012 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739818072] [2021-11-09 10:01:39,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739818072] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:01:39,012 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-09 10:01:39,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-09 10:01:39,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491912305] [2021-11-09 10:01:39,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-09 10:01:39,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:01:39,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-09 10:01:39,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-09 10:01:39,014 INFO L87 Difference]: Start difference. First operand 144 states and 152 transitions. Second operand has 9 states, 9 states have (on average 6.666666666666667) internal successors, (60), 6 states have internal predecessors, (60), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-09 10:01:39,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:01:39,996 INFO L93 Difference]: Finished difference Result 153 states and 157 transitions. [2021-11-09 10:01:39,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-09 10:01:39,997 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.666666666666667) internal successors, (60), 6 states have internal predecessors, (60), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 81 [2021-11-09 10:01:39,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:01:39,998 INFO L225 Difference]: With dead ends: 153 [2021-11-09 10:01:39,998 INFO L226 Difference]: Without dead ends: 151 [2021-11-09 10:01:39,998 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2021-11-09 10:01:39,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-09 10:01:40,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 144. [2021-11-09 10:01:40,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 112 states have (on average 1.1785714285714286) internal successors, (132), 126 states have internal predecessors, (132), 9 states have call successors, (9), 9 states have call predecessors, (9), 9 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-09 10:01:40,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 151 transitions. [2021-11-09 10:01:40,003 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 151 transitions. Word has length 81 [2021-11-09 10:01:40,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:01:40,004 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 151 transitions. [2021-11-09 10:01:40,004 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.666666666666667) internal successors, (60), 6 states have internal predecessors, (60), 1 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-09 10:01:40,004 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 151 transitions. [2021-11-09 10:01:40,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-09 10:01:40,005 INFO L505 BasicCegarLoop]: Found error trace [2021-11-09 10:01:40,005 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:01:40,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-09 10:01:40,006 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting dll_circular_remove_firstErr2REQUIRES_VIOLATION === [dll_circular_createErr0REQUIRES_VIOLATION, dll_circular_createErr1REQUIRES_VIOLATION, dll_circular_createErr2REQUIRES_VIOLATION (and 43 more)] === [2021-11-09 10:01:40,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-09 10:01:40,006 INFO L85 PathProgramCache]: Analyzing trace with hash 1713178114, now seen corresponding path program 1 times [2021-11-09 10:01:40,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-09 10:01:40,007 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462406447] [2021-11-09 10:01:40,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:01:40,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-09 10:01:40,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-09 10:01:40,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-11-09 10:01:40,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-09 10:01:40,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,235 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-09 10:01:40,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-11-09 10:01:40,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-11-09 10:01:40,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:40,289 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-09 10:01:40,290 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-09 10:01:40,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462406447] [2021-11-09 10:01:40,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462406447] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-09 10:01:40,290 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986918275] [2021-11-09 10:01:40,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-09 10:01:40,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:01:40,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 [2021-11-09 10:01:40,291 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-09 10:01:40,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-09 10:01:41,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-09 10:01:41,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 470 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-09 10:01:41,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-09 10:01:42,115 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-09 10:01:42,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986918275] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-09 10:01:42,116 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-09 10:01:42,116 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2021-11-09 10:01:42,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640186493] [2021-11-09 10:01:42,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-09 10:01:42,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-09 10:01:42,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-09 10:01:42,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-09 10:01:42,117 INFO L87 Difference]: Start difference. First operand 144 states and 151 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-09 10:01:42,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-09 10:01:42,153 INFO L93 Difference]: Finished difference Result 78 states and 77 transitions. [2021-11-09 10:01:42,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-09 10:01:42,154 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 82 [2021-11-09 10:01:42,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-09 10:01:42,154 INFO L225 Difference]: With dead ends: 78 [2021-11-09 10:01:42,154 INFO L226 Difference]: Without dead ends: 0 [2021-11-09 10:01:42,154 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-09 10:01:42,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-09 10:01:42,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-09 10:01:42,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 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 10:01:42,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-09 10:01:42,155 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 82 [2021-11-09 10:01:42,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-09 10:01:42,155 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-09 10:01:42,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-09 10:01:42,155 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-09 10:01:42,155 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-09 10:01:42,157 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr0REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr1REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr2REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr3REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr4REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr5REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr6REQUIRES_VIOLATION [2021-11-09 10:01:42,158 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_createErr7REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr0REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr1REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr2REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr3REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr4REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr5REQUIRES_VIOLATION [2021-11-09 10:01:42,159 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr0REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr1REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr2REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr3REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr4REQUIRES_VIOLATION [2021-11-09 10:01:42,160 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr5REQUIRES_VIOLATION [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr6REQUIRES_VIOLATION [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr7REQUIRES_VIOLATION [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr8ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr9ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr10ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr11REQUIRES_VIOLATION [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr12REQUIRES_VIOLATION [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr13REQUIRES_VIOLATION [2021-11-09 10:01:42,161 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr14REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr15REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr16REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr17REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr18REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr19REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr20REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr21REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr22REQUIRES_VIOLATION [2021-11-09 10:01:42,162 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr23ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 10:01:42,163 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr24ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 10:01:42,163 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr25ASSERT_VIOLATIONMEMORY_FREE [2021-11-09 10:01:42,163 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr26REQUIRES_VIOLATION [2021-11-09 10:01:42,163 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_circular_remove_firstErr27REQUIRES_VIOLATION [2021-11-09 10:01:42,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-09 10:01:42,374 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-09 10:01:42,377 INFO L731 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-09 10:01:42,379 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-09 10:01:42,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.11 10:01:42 BoogieIcfgContainer [2021-11-09 10:01:42,391 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-09 10:01:42,392 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-09 10:01:42,392 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-09 10:01:42,393 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-09 10:01:42,393 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 09:52:09" (3/4) ... [2021-11-09 10:01:42,396 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-09 10:01:42,410 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure reach_error [2021-11-09 10:01:42,411 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_circular_remove_first [2021-11-09 10:01:42,411 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-11-09 10:01:42,411 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure myexit [2021-11-09 10:01:42,411 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-11-09 10:01:42,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-11-09 10:01:42,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-11-09 10:01:42,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_circular_create [2021-11-09 10:01:42,412 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2021-11-09 10:01:42,424 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 17 nodes and edges [2021-11-09 10:01:42,425 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-11-09 10:01:42,425 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-11-09 10:01:42,425 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-09 10:01:42,491 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/witness.graphml [2021-11-09 10:01:42,491 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-09 10:01:42,492 INFO L168 Benchmark]: Toolchain (without parser) took 575041.60 ms. Allocated memory was 100.7 MB in the beginning and 352.3 MB in the end (delta: 251.7 MB). Free memory was 59.1 MB in the beginning and 90.1 MB in the end (delta: -31.0 MB). Peak memory consumption was 219.8 MB. Max. memory is 16.1 GB. [2021-11-09 10:01:42,492 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 100.7 MB. Free memory is still 76.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-09 10:01:42,492 INFO L168 Benchmark]: CACSL2BoogieTranslator took 600.60 ms. Allocated memory is still 100.7 MB. Free memory was 58.9 MB in the beginning and 69.2 MB in the end (delta: -10.3 MB). Peak memory consumption was 8.7 MB. Max. memory is 16.1 GB. [2021-11-09 10:01:42,493 INFO L168 Benchmark]: Boogie Preprocessor took 62.52 ms. Allocated memory is still 100.7 MB. Free memory was 69.2 MB in the beginning and 66.2 MB in the end (delta: 3.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-09 10:01:42,493 INFO L168 Benchmark]: RCFGBuilder took 904.03 ms. Allocated memory is still 100.7 MB. Free memory was 66.2 MB in the beginning and 40.9 MB in the end (delta: 25.3 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2021-11-09 10:01:42,494 INFO L168 Benchmark]: TraceAbstraction took 573366.24 ms. Allocated memory was 100.7 MB in the beginning and 352.3 MB in the end (delta: 251.7 MB). Free memory was 40.3 MB in the beginning and 94.3 MB in the end (delta: -53.9 MB). Peak memory consumption was 200.6 MB. Max. memory is 16.1 GB. [2021-11-09 10:01:42,494 INFO L168 Benchmark]: Witness Printer took 98.92 ms. Allocated memory is still 352.3 MB. Free memory was 94.3 MB in the beginning and 90.1 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-11-09 10:01:42,498 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 100.7 MB. Free memory is still 76.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 600.60 ms. Allocated memory is still 100.7 MB. Free memory was 58.9 MB in the beginning and 69.2 MB in the end (delta: -10.3 MB). Peak memory consumption was 8.7 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 62.52 ms. Allocated memory is still 100.7 MB. Free memory was 69.2 MB in the beginning and 66.2 MB in the end (delta: 3.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 904.03 ms. Allocated memory is still 100.7 MB. Free memory was 66.2 MB in the beginning and 40.9 MB in the end (delta: 25.3 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 573366.24 ms. Allocated memory was 100.7 MB in the beginning and 352.3 MB in the end (delta: 251.7 MB). Free memory was 40.3 MB in the beginning and 94.3 MB in the end (delta: -53.9 MB). Peak memory consumption was 200.6 MB. Max. memory is 16.1 GB. * Witness Printer took 98.92 ms. Allocated memory is still 352.3 MB. Free memory was 94.3 MB in the beginning and 90.1 MB in the end (delta: 4.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 590]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 590]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 592]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 597]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 597]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 598]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 598]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 580]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 581]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 582]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 623]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 623]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 627]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 614]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 602]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 602]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 602]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 602]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 603]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 603]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 604]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 604]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 604]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 605]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 607]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 607]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 607]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 607]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 608]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 608]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 609]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 610]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 610]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 610]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 611]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 611]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 123 locations, 46 error locations. Started 1 CEGAR loops. OverallTime: 573.2s, OverallIterations: 46, TraceHistogramMax: 3, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 321.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 2265 SDtfs, 7377 SDslu, 13840 SDs, 0 SdLazy, 49990 SolverSat, 1585 SolverUnsat, 43 SolverUnknown, 0 SolverNotchecked, 128.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2911 GetRequests, 1299 SyntacticMatches, 43 SemanticMatches, 1569 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18372 ImplicationChecksByTransitivity, 283.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=153occurred in iteration=16, InterpolantAutomatonStates: 847, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 46 MinimizatonAttempts, 308 StatesRemovedByMinimization, 32 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.7s SatisfiabilityAnalysisTime, 221.7s InterpolantComputationTime, 3579 NumberOfCodeBlocks, 3579 NumberOfCodeBlocksAsserted, 68 NumberOfCheckSat, 3511 ConstructedInterpolants, 152 QuantifiedInterpolants, 69919 SizeOfPredicates, 337 NumberOfNonLiveVariables, 7675 ConjunctsInSsa, 1272 ConjunctsInUnsatCore, 68 InterpolantComputations, 23 PerfectInterpolantSequences, 480/838 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 46 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-11-09 10:01:42,713 WARN L435 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2021-11-09 10:01:42,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d875ab0e-75df-46b6-abc2-609df98c7719/bin/uautomizer-IVEQpCNsaX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE