./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt --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 0ce920e15f46d58ceba7fe374bfd0d01be2609b3 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 00:40:54,778 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 00:40:54,789 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 00:40:54,852 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 00:40:54,853 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 00:40:54,857 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 00:40:54,859 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 00:40:54,863 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 00:40:54,866 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 00:40:54,875 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 00:40:54,876 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 00:40:54,878 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 00:40:54,880 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 00:40:54,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 00:40:54,887 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 00:40:54,896 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 00:40:54,898 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 00:40:54,900 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 00:40:54,902 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 00:40:54,910 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 00:40:54,913 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 00:40:54,914 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 00:40:54,918 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 00:40:54,919 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 00:40:54,930 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 00:40:54,931 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 00:40:54,931 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 00:40:54,934 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 00:40:54,934 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 00:40:54,936 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 00:40:54,937 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 00:40:54,938 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 00:40:54,940 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 00:40:54,941 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 00:40:54,943 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 00:40:54,943 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 00:40:54,944 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 00:40:54,945 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 00:40:54,945 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 00:40:54,946 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 00:40:54,947 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 00:40:54,948 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-13 00:40:54,993 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 00:40:54,994 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 00:40:54,995 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-13 00:40:55,001 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-13 00:40:55,003 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 00:40:55,003 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 00:40:55,004 INFO L138 SettingsManager]: * Use SBE=true [2021-10-13 00:40:55,004 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 00:40:55,004 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 00:40:55,005 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 00:40:55,006 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 00:40:55,006 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 00:40:55,006 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 00:40:55,006 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 00:40:55,007 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 00:40:55,007 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 00:40:55,007 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 00:40:55,007 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 00:40:55,008 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 00:40:55,008 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 00:40:55,008 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 00:40:55,008 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 00:40:55,009 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 00:40:55,009 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:40:55,009 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 00:40:55,009 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 00:40:55,010 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-13 00:40:55,010 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 00:40:55,010 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 00:40:55,012 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_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0ce920e15f46d58ceba7fe374bfd0d01be2609b3 [2021-10-13 00:40:55,292 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 00:40:55,315 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 00:40:55,317 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 00:40:55,319 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 00:40:55,319 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 00:40:55,320 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-10-13 00:40:55,423 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/data/e241909b7/c403e592dea64c149236b91bea5cfb09/FLAG8d53fce57 [2021-10-13 00:40:56,030 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 00:40:56,031 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2021-10-13 00:40:56,057 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/data/e241909b7/c403e592dea64c149236b91bea5cfb09/FLAG8d53fce57 [2021-10-13 00:40:56,298 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/data/e241909b7/c403e592dea64c149236b91bea5cfb09 [2021-10-13 00:40:56,300 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 00:40:56,302 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-13 00:40:56,304 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 00:40:56,304 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 00:40:56,311 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 00:40:56,312 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,314 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@593b3ea5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56, skipping insertion in model container [2021-10-13 00:40:56,314 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,321 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 00:40:56,381 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 00:40:56,730 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_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-10-13 00:40:56,732 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:40:56,749 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 00:40:56,840 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_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2021-10-13 00:40:56,843 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 00:40:56,882 INFO L208 MainTranslator]: Completed translation [2021-10-13 00:40:56,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56 WrapperNode [2021-10-13 00:40:56,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 00:40:56,884 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 00:40:56,884 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 00:40:56,884 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 00:40:56,897 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,898 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,914 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,935 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,941 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,951 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,970 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 00:40:56,971 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 00:40:56,971 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 00:40:56,971 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 00:40:56,975 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (1/1) ... [2021-10-13 00:40:56,993 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 00:40:57,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:40:57,026 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 00:40:57,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 00:40:57,066 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-13 00:40:57,066 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 00:40:57,066 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-10-13 00:40:57,067 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-13 00:40:57,067 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-13 00:40:57,067 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2021-10-13 00:40:57,067 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2021-10-13 00:40:57,068 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_create [2021-10-13 00:40:57,068 INFO L138 BoogieDeclarations]: Found implementation of procedure dll_remove_last [2021-10-13 00:40:57,068 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-13 00:40:57,068 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-13 00:40:57,068 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-13 00:40:57,069 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-13 00:40:57,070 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-13 00:40:57,071 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-13 00:40:57,072 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-13 00:40:57,072 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-13 00:40:57,072 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-13 00:40:57,072 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-13 00:40:57,072 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-13 00:40:57,072 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-13 00:40:57,073 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-13 00:40:57,073 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-13 00:40:57,073 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-13 00:40:57,073 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-13 00:40:57,073 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-13 00:40:57,074 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-13 00:40:57,074 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-13 00:40:57,074 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-13 00:40:57,074 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-13 00:40:57,074 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-13 00:40:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-13 00:40:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-13 00:40:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-13 00:40:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-13 00:40:57,075 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-13 00:40:57,076 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-13 00:40:57,076 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-13 00:40:57,076 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-13 00:40:57,076 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-13 00:40:57,076 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-13 00:40:57,077 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-13 00:40:57,077 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-13 00:40:57,077 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-13 00:40:57,077 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-13 00:40:57,077 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2021-10-13 00:40:57,078 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-13 00:40:57,078 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-13 00:40:57,078 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-13 00:40:57,078 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-13 00:40:57,078 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-13 00:40:57,079 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-13 00:40:57,079 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-13 00:40:57,079 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-13 00:40:57,079 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-13 00:40:57,079 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-13 00:40:57,079 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-13 00:40:57,080 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-13 00:40:57,080 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-13 00:40:57,080 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-13 00:40:57,080 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-13 00:40:57,080 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-13 00:40:57,081 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-13 00:40:57,081 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-13 00:40:57,081 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-13 00:40:57,081 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-13 00:40:57,081 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-13 00:40:57,082 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-13 00:40:57,082 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-13 00:40:57,082 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-13 00:40:57,082 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-13 00:40:57,082 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-13 00:40:57,082 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-13 00:40:57,083 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-13 00:40:57,083 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-13 00:40:57,083 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-13 00:40:57,083 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-13 00:40:57,083 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-13 00:40:57,084 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-13 00:40:57,084 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-13 00:40:57,084 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-13 00:40:57,084 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-13 00:40:57,084 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-13 00:40:57,085 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-13 00:40:57,085 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-13 00:40:57,085 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-13 00:40:57,085 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-13 00:40:57,085 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-13 00:40:57,085 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-13 00:40:57,086 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-13 00:40:57,086 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-13 00:40:57,086 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-13 00:40:57,086 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-13 00:40:57,086 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2021-10-13 00:40:57,087 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2021-10-13 00:40:57,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 00:40:57,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-13 00:40:57,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 00:40:57,087 INFO L130 BoogieDeclarations]: Found specification of procedure dll_create [2021-10-13 00:40:57,088 INFO L130 BoogieDeclarations]: Found specification of procedure dll_remove_last [2021-10-13 00:40:57,088 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-13 00:40:57,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 00:40:57,088 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-13 00:40:57,088 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-10-13 00:40:57,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-13 00:40:57,089 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 00:40:57,089 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 00:40:57,089 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 00:40:57,374 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2021-10-13 00:40:57,858 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 00:40:57,859 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-10-13 00:40:57,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:40:57 BoogieIcfgContainer [2021-10-13 00:40:57,863 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 00:40:57,865 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 00:40:57,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 00:40:57,868 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 00:40:57,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 12:40:56" (1/3) ... [2021-10-13 00:40:57,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ccae0fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:40:57, skipping insertion in model container [2021-10-13 00:40:57,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 12:40:56" (2/3) ... [2021-10-13 00:40:57,870 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ccae0fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 12:40:57, skipping insertion in model container [2021-10-13 00:40:57,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:40:57" (3/3) ... [2021-10-13 00:40:57,871 INFO L111 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2021-10-13 00:40:57,877 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 00:40:57,878 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 40 error locations. [2021-10-13 00:40:57,930 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 00:40:57,937 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, mConcurrency=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 [2021-10-13 00:40:57,937 INFO L340 AbstractCegarLoop]: Starting to check reachability of 40 error locations. [2021-10-13 00:40:57,957 INFO L276 IsEmpty]: Start isEmpty. Operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:40:57,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 00:40:57,966 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:40:57,967 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:40:57,967 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting dll_createErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:40:57,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:40:57,974 INFO L82 PathProgramCache]: Analyzing trace with hash -961704470, now seen corresponding path program 1 times [2021-10-13 00:40:57,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:40:57,986 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867153879] [2021-10-13 00:40:57,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:40:57,987 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:40:58,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:58,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:40:58,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:58,270 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:40:58,271 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:40:58,271 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867153879] [2021-10-13 00:40:58,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867153879] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:40:58,272 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:40:58,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 00:40:58,274 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512965470] [2021-10-13 00:40:58,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:40:58,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:40:58,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:40:58,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:40:58,305 INFO L87 Difference]: Start difference. First operand has 88 states, 44 states have (on average 2.0) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:40:58,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:40:58,620 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2021-10-13 00:40:58,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:40:58,622 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-13 00:40:58,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:40:58,633 INFO L225 Difference]: With dead ends: 89 [2021-10-13 00:40:58,633 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 00:40:58,635 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:40:58,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 00:40:58,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 79. [2021-10-13 00:40:58,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 41 states have (on average 1.853658536585366) internal successors, (76), 71 states have internal predecessors, (76), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:40:58,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2021-10-13 00:40:58,685 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 11 [2021-10-13 00:40:58,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:40:58,686 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2021-10-13 00:40:58,686 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:40:58,686 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2021-10-13 00:40:58,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 00:40:58,687 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:40:58,687 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:40:58,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 00:40:58,688 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting dll_createErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:40:58,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:40:58,690 INFO L82 PathProgramCache]: Analyzing trace with hash -961704469, now seen corresponding path program 1 times [2021-10-13 00:40:58,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:40:58,692 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730311554] [2021-10-13 00:40:58,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:40:58,692 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:40:58,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:58,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:40:58,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:58,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:40:58,824 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:40:58,824 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730311554] [2021-10-13 00:40:58,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730311554] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:40:58,824 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:40:58,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 00:40:58,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273339701] [2021-10-13 00:40:58,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:40:58,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:40:58,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:40:58,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:40:58,831 INFO L87 Difference]: Start difference. First operand 79 states and 83 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:40:59,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:40:59,030 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-10-13 00:40:59,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:40:59,031 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-13 00:40:59,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:40:59,035 INFO L225 Difference]: With dead ends: 80 [2021-10-13 00:40:59,036 INFO L226 Difference]: Without dead ends: 80 [2021-10-13 00:40:59,037 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.9ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:40:59,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-13 00:40:59,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-10-13 00:40:59,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 68 states have internal predecessors, (73), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:40:59,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2021-10-13 00:40:59,061 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 11 [2021-10-13 00:40:59,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:40:59,062 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2021-10-13 00:40:59,062 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, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:40:59,062 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2021-10-13 00:40:59,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-13 00:40:59,063 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:40:59,063 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:40:59,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 00:40:59,064 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:40:59,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:40:59,064 INFO L82 PathProgramCache]: Analyzing trace with hash 950899493, now seen corresponding path program 1 times [2021-10-13 00:40:59,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:40:59,065 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618290826] [2021-10-13 00:40:59,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:40:59,065 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:40:59,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:40:59,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:40:59,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:40:59,233 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:40:59,233 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618290826] [2021-10-13 00:40:59,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618290826] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:40:59,235 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:40:59,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:40:59,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947992888] [2021-10-13 00:40:59,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:40:59,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:40:59,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:40:59,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:40:59,244 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:40:59,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:40:59,603 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-10-13 00:40:59,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:40:59,604 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 15 [2021-10-13 00:40:59,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:40:59,605 INFO L225 Difference]: With dead ends: 89 [2021-10-13 00:40:59,605 INFO L226 Difference]: Without dead ends: 86 [2021-10-13 00:40:59,606 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 124.0ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:40:59,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-10-13 00:40:59,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2021-10-13 00:40:59,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 42 states have (on average 1.7619047619047619) internal successors, (74), 69 states have internal predecessors, (74), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:40:59,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2021-10-13 00:40:59,613 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 15 [2021-10-13 00:40:59,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:40:59,613 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2021-10-13 00:40:59,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:40:59,614 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2021-10-13 00:40:59,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-13 00:40:59,614 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:40:59,615 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:40:59,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-13 00:40:59,615 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:40:59,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:40:59,616 INFO L82 PathProgramCache]: Analyzing trace with hash 2016813486, now seen corresponding path program 1 times [2021-10-13 00:40:59,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:40:59,616 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361440037] [2021-10-13 00:40:59,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:40:59,617 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:40:59,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:40:59,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:40:59,704 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:40:59,704 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361440037] [2021-10-13 00:40:59,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361440037] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:40:59,705 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:40:59,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-13 00:40:59,706 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905933826] [2021-10-13 00:40:59,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:40:59,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:40:59,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:40:59,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 00:40:59,708 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:40:59,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:40:59,870 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-10-13 00:40:59,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 00:40:59,871 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-10-13 00:40:59,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:40:59,872 INFO L225 Difference]: With dead ends: 83 [2021-10-13 00:40:59,872 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 00:40:59,873 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 00:40:59,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 00:40:59,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-10-13 00:40:59,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 47 states have (on average 1.6808510638297873) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:40:59,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-10-13 00:40:59,879 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 15 [2021-10-13 00:40:59,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:40:59,879 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-10-13 00:40:59,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-13 00:40:59,880 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-10-13 00:40:59,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 00:40:59,880 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:40:59,880 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:40:59,881 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-13 00:40:59,881 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:40:59,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:40:59,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1092107051, now seen corresponding path program 1 times [2021-10-13 00:40:59,882 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:40:59,882 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015285502] [2021-10-13 00:40:59,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:40:59,882 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:40:59,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:40:59,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:40:59,949 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:40:59,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:00,005 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:00,006 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:00,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015285502] [2021-10-13 00:41:00,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015285502] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:00,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011319900] [2021-10-13 00:41:00,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:00,007 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:00,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:00,014 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:00,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 00:41:00,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:00,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:41:00,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:00,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:00,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011319900] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:00,277 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:00,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2021-10-13 00:41:00,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830397599] [2021-10-13 00:41:00,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 00:41:00,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:00,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 00:41:00,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-10-13 00:41:00,279 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:00,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:00,604 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2021-10-13 00:41:00,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:41:00,605 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-10-13 00:41:00,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:00,606 INFO L225 Difference]: With dead ends: 96 [2021-10-13 00:41:00,606 INFO L226 Difference]: Without dead ends: 93 [2021-10-13 00:41:00,606 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 112.7ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-10-13 00:41:00,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-10-13 00:41:00,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 84. [2021-10-13 00:41:00,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 49 states have (on average 1.653061224489796) internal successors, (81), 76 states have internal predecessors, (81), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:00,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2021-10-13 00:41:00,613 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 22 [2021-10-13 00:41:00,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:00,613 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2021-10-13 00:41:00,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:00,613 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2021-10-13 00:41:00,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 00:41:00,614 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:00,614 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:41:00,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:00,815 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:00,815 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting dll_createErr6REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:00,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:00,816 INFO L82 PathProgramCache]: Analyzing trace with hash -26193058, now seen corresponding path program 1 times [2021-10-13 00:41:00,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:00,816 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006362001] [2021-10-13 00:41:00,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:00,816 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:00,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:00,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:00,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:00,985 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:00,985 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:00,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006362001] [2021-10-13 00:41:00,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006362001] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:00,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634566138] [2021-10-13 00:41:00,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:00,987 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:00,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:00,992 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:01,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-13 00:41:01,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:01,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 00:41:01,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:01,223 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 [2021-10-13 00:41:01,277 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-10-13 00:41:01,278 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 [2021-10-13 00:41:01,577 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:01,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634566138] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:01,578 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:01,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-10-13 00:41:01,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698531759] [2021-10-13 00:41:01,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:41:01,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:01,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:41:01,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:41:01,580 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-10-13 00:41:01,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:01,779 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2021-10-13 00:41:01,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:41:01,780 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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 22 [2021-10-13 00:41:01,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:01,781 INFO L225 Difference]: With dead ends: 83 [2021-10-13 00:41:01,781 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 00:41:01,782 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 61.3ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:41:01,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 00:41:01,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-10-13 00:41:01,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 49 states have (on average 1.6326530612244898) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:01,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-10-13 00:41:01,795 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 22 [2021-10-13 00:41:01,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:01,796 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-10-13 00:41:01,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 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) [2021-10-13 00:41:01,796 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-10-13 00:41:01,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 00:41:01,797 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:01,797 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:41:01,827 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-10-13 00:41:02,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:02,009 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting dll_createErr7REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:02,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:02,010 INFO L82 PathProgramCache]: Analyzing trace with hash -26193057, now seen corresponding path program 1 times [2021-10-13 00:41:02,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:02,010 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788634241] [2021-10-13 00:41:02,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:02,011 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:02,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:02,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:02,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:02,113 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:02,113 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:02,113 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788634241] [2021-10-13 00:41:02,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788634241] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:02,114 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315562887] [2021-10-13 00:41:02,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:02,114 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:02,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:02,127 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:02,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-13 00:41:02,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:02,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 00:41:02,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:02,326 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 [2021-10-13 00:41:02,496 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:41:02,497 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 [2021-10-13 00:41:02,517 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:41:02,517 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 [2021-10-13 00:41:02,681 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:02,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315562887] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:02,682 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:02,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2021-10-13 00:41:02,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581737862] [2021-10-13 00:41:02,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:41:02,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:02,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:41:02,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:41:02,688 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 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) [2021-10-13 00:41:03,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:03,061 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2021-10-13 00:41:03,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:41:03,062 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 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 22 [2021-10-13 00:41:03,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:03,063 INFO L225 Difference]: With dead ends: 82 [2021-10-13 00:41:03,063 INFO L226 Difference]: Without dead ends: 82 [2021-10-13 00:41:03,063 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 165.4ms TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:03,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-10-13 00:41:03,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-10-13 00:41:03,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 49 states have (on average 1.6122448979591837) internal successors, (79), 74 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:03,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2021-10-13 00:41:03,069 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 22 [2021-10-13 00:41:03,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:03,070 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2021-10-13 00:41:03,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 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) [2021-10-13 00:41:03,070 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2021-10-13 00:41:03,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-10-13 00:41:03,071 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:03,071 INFO L512 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] [2021-10-13 00:41:03,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:03,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-10-13 00:41:03,272 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:03,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:03,273 INFO L82 PathProgramCache]: Analyzing trace with hash 668159269, now seen corresponding path program 2 times [2021-10-13 00:41:03,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:03,273 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708748703] [2021-10-13 00:41:03,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:03,273 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:03,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:03,317 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:03,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:03,331 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:03,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:03,364 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:03,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:03,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708748703] [2021-10-13 00:41:03,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708748703] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:03,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110524094] [2021-10-13 00:41:03,365 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 00:41:03,365 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:03,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:03,366 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:03,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-13 00:41:03,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-13 00:41:03,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 00:41:03,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 00:41:03,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:03,620 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:03,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110524094] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:03,620 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 00:41:03,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-10-13 00:41:03,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127978822] [2021-10-13 00:41:03,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 00:41:03,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:03,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 00:41:03,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:41:03,622 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:41:03,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:03,642 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-10-13 00:41:03,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 00:41:03,643 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-10-13 00:41:03,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:03,646 INFO L225 Difference]: With dead ends: 85 [2021-10-13 00:41:03,646 INFO L226 Difference]: Without dead ends: 85 [2021-10-13 00:41:03,646 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.2ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:41:03,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-10-13 00:41:03,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-10-13 00:41:03,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.6) internal successors, (80), 75 states have internal predecessors, (80), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:03,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 87 transitions. [2021-10-13 00:41:03,664 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 87 transitions. Word has length 29 [2021-10-13 00:41:03,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:03,665 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 87 transitions. [2021-10-13 00:41:03,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:41:03,665 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 87 transitions. [2021-10-13 00:41:03,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-10-13 00:41:03,667 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:03,667 INFO L512 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] [2021-10-13 00:41:03,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:03,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-10-13 00:41:03,887 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:03,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:03,888 INFO L82 PathProgramCache]: Analyzing trace with hash -2143918591, now seen corresponding path program 1 times [2021-10-13 00:41:03,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:03,888 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259559983] [2021-10-13 00:41:03,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:03,888 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:03,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:03,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:03,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:03,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:03,986 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:03,986 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:03,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259559983] [2021-10-13 00:41:03,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259559983] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:03,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458007287] [2021-10-13 00:41:03,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:03,988 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:03,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:03,999 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:04,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-13 00:41:04,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:04,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 00:41:04,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:04,290 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:04,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458007287] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:04,291 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:04,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 6 [2021-10-13 00:41:04,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45297395] [2021-10-13 00:41:04,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:41:04,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:04,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:41:04,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-10-13 00:41:04,292 INFO L87 Difference]: Start difference. First operand 83 states and 87 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:04,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:04,502 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-10-13 00:41:04,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 00:41:04,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2021-10-13 00:41:04,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:04,504 INFO L225 Difference]: With dead ends: 83 [2021-10-13 00:41:04,504 INFO L226 Difference]: Without dead ends: 83 [2021-10-13 00:41:04,504 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 50.3ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:41:04,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-10-13 00:41:04,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-10-13 00:41:04,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 50 states have (on average 1.58) internal successors, (79), 75 states have internal predecessors, (79), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:04,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2021-10-13 00:41:04,507 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 31 [2021-10-13 00:41:04,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:04,508 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2021-10-13 00:41:04,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:04,508 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2021-10-13 00:41:04,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-13 00:41:04,509 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:04,509 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:04,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:04,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:04,710 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:04,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:04,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1187913315, now seen corresponding path program 1 times [2021-10-13 00:41:04,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:04,710 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401242709] [2021-10-13 00:41:04,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:04,711 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:04,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:04,784 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:04,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:04,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:04,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:05,114 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:05,115 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:05,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401242709] [2021-10-13 00:41:05,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401242709] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:05,116 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024326656] [2021-10-13 00:41:05,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:05,116 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:05,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:05,117 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:05,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-10-13 00:41:05,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:05,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 00:41:05,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:05,336 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 [2021-10-13 00:41:05,371 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 [2021-10-13 00:41:05,825 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-13 00:41:05,825 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 20 treesize of output 24 [2021-10-13 00:41:05,999 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:05,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024326656] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:05,999 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:05,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18 [2021-10-13 00:41:06,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389107724] [2021-10-13 00:41:06,000 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-13 00:41:06,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:06,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-13 00:41:06,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-10-13 00:41:06,001 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:07,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:07,371 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2021-10-13 00:41:07,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-13 00:41:07,372 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 32 [2021-10-13 00:41:07,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:07,373 INFO L225 Difference]: With dead ends: 132 [2021-10-13 00:41:07,373 INFO L226 Difference]: Without dead ends: 132 [2021-10-13 00:41:07,374 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 686.8ms TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2021-10-13 00:41:07,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-10-13 00:41:07,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 97. [2021-10-13 00:41:07,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 64 states have (on average 1.453125) internal successors, (93), 87 states have internal predecessors, (93), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:41:07,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 103 transitions. [2021-10-13 00:41:07,381 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 103 transitions. Word has length 32 [2021-10-13 00:41:07,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:07,381 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 103 transitions. [2021-10-13 00:41:07,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.0) internal successors, (51), 15 states have internal predecessors, (51), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:07,382 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 103 transitions. [2021-10-13 00:41:07,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-10-13 00:41:07,389 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:07,389 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:07,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:07,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:07,606 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting dll_remove_lastErr1REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:07,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:07,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1187913314, now seen corresponding path program 1 times [2021-10-13 00:41:07,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:07,607 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942161398] [2021-10-13 00:41:07,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:07,607 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:07,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:07,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:07,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:07,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:07,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:08,028 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:08,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:08,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942161398] [2021-10-13 00:41:08,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942161398] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:08,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598668290] [2021-10-13 00:41:08,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:08,029 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:08,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:08,035 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:08,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-10-13 00:41:08,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:08,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-13 00:41:08,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:08,290 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 [2021-10-13 00:41:08,316 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 [2021-10-13 00:41:08,883 INFO L354 Elim1Store]: treesize reduction 44, result has 20.0 percent of original size [2021-10-13 00:41:08,884 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 29 [2021-10-13 00:41:09,074 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:09,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598668290] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:09,075 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:09,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 17 [2021-10-13 00:41:09,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010324584] [2021-10-13 00:41:09,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-13 00:41:09,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:09,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-13 00:41:09,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:41:09,077 INFO L87 Difference]: Start difference. First operand 97 states and 103 transitions. Second operand has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:10,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:10,119 INFO L93 Difference]: Finished difference Result 142 states and 150 transitions. [2021-10-13 00:41:10,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 00:41:10,120 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 32 [2021-10-13 00:41:10,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:10,122 INFO L225 Difference]: With dead ends: 142 [2021-10-13 00:41:10,122 INFO L226 Difference]: Without dead ends: 142 [2021-10-13 00:41:10,122 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 584.9ms TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2021-10-13 00:41:10,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-10-13 00:41:10,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 122. [2021-10-13 00:41:10,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 87 states have (on average 1.5517241379310345) internal successors, (135), 110 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-13 00:41:10,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 147 transitions. [2021-10-13 00:41:10,128 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 147 transitions. Word has length 32 [2021-10-13 00:41:10,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:10,129 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 147 transitions. [2021-10-13 00:41:10,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.125) internal successors, (50), 14 states have internal predecessors, (50), 4 states have call successors, (7), 6 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:10,129 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 147 transitions. [2021-10-13 00:41:10,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-10-13 00:41:10,132 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:10,133 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:10,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:10,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-10-13 00:41:10,359 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:10,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:10,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1829392906, now seen corresponding path program 1 times [2021-10-13 00:41:10,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:10,360 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398994163] [2021-10-13 00:41:10,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:10,361 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:10,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:10,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:10,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:10,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:10,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:10,563 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 00:41:10,563 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:10,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398994163] [2021-10-13 00:41:10,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398994163] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:10,564 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:10,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-13 00:41:10,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271156687] [2021-10-13 00:41:10,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 00:41:10,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:10,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 00:41:10,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:10,566 INFO L87 Difference]: Start difference. First operand 122 states and 147 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:11,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:11,141 INFO L93 Difference]: Finished difference Result 165 states and 205 transitions. [2021-10-13 00:41:11,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 00:41:11,141 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-10-13 00:41:11,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:11,143 INFO L225 Difference]: With dead ends: 165 [2021-10-13 00:41:11,143 INFO L226 Difference]: Without dead ends: 165 [2021-10-13 00:41:11,144 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 232.2ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-10-13 00:41:11,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-10-13 00:41:11,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 127. [2021-10-13 00:41:11,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 114 states have internal predecessors, (143), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:41:11,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 157 transitions. [2021-10-13 00:41:11,150 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 157 transitions. Word has length 33 [2021-10-13 00:41:11,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:11,151 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 157 transitions. [2021-10-13 00:41:11,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:11,151 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 157 transitions. [2021-10-13 00:41:11,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-10-13 00:41:11,152 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:11,152 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:11,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-13 00:41:11,153 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:11,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:11,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1829392907, now seen corresponding path program 1 times [2021-10-13 00:41:11,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:11,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468159208] [2021-10-13 00:41:11,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:11,154 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:11,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:11,267 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:11,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:11,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:11,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:11,367 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:11,367 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:11,367 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468159208] [2021-10-13 00:41:11,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468159208] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:11,368 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:11,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-13 00:41:11,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248474613] [2021-10-13 00:41:11,368 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 00:41:11,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:11,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 00:41:11,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:11,370 INFO L87 Difference]: Start difference. First operand 127 states and 157 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:12,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:12,087 INFO L93 Difference]: Finished difference Result 168 states and 208 transitions. [2021-10-13 00:41:12,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 00:41:12,089 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-10-13 00:41:12,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:12,091 INFO L225 Difference]: With dead ends: 168 [2021-10-13 00:41:12,091 INFO L226 Difference]: Without dead ends: 168 [2021-10-13 00:41:12,091 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 316.1ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-10-13 00:41:12,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-10-13 00:41:12,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 127. [2021-10-13 00:41:12,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 91 states have (on average 1.5494505494505495) internal successors, (141), 114 states have internal predecessors, (141), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:41:12,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 155 transitions. [2021-10-13 00:41:12,102 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 155 transitions. Word has length 33 [2021-10-13 00:41:12,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:12,103 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 155 transitions. [2021-10-13 00:41:12,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:12,103 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 155 transitions. [2021-10-13 00:41:12,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-10-13 00:41:12,106 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:12,106 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:12,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-10-13 00:41:12,107 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:12,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:12,107 INFO L82 PathProgramCache]: Analyzing trace with hash 604055652, now seen corresponding path program 1 times [2021-10-13 00:41:12,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:12,108 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115668793] [2021-10-13 00:41:12,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:12,108 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:12,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:12,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:12,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:12,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:12,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:12,283 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:12,283 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:12,283 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115668793] [2021-10-13 00:41:12,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115668793] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:12,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:12,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-13 00:41:12,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065611475] [2021-10-13 00:41:12,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 00:41:12,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:12,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 00:41:12,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:12,286 INFO L87 Difference]: Start difference. First operand 127 states and 155 transitions. Second operand has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:12,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:12,800 INFO L93 Difference]: Finished difference Result 126 states and 153 transitions. [2021-10-13 00:41:12,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 00:41:12,801 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2021-10-13 00:41:12,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:12,802 INFO L225 Difference]: With dead ends: 126 [2021-10-13 00:41:12,803 INFO L226 Difference]: Without dead ends: 126 [2021-10-13 00:41:12,803 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 272.4ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-10-13 00:41:12,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-10-13 00:41:12,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-10-13 00:41:12,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 91 states have (on average 1.5274725274725274) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:41:12,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-10-13 00:41:12,809 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 36 [2021-10-13 00:41:12,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:12,810 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-10-13 00:41:12,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.727272727272727) internal successors, (30), 8 states have internal predecessors, (30), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:12,810 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-10-13 00:41:12,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-13 00:41:12,811 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:12,811 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:12,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-10-13 00:41:12,811 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:12,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:12,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1546287056, now seen corresponding path program 1 times [2021-10-13 00:41:12,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:12,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108010955] [2021-10-13 00:41:12,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:12,813 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:12,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:12,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:12,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:12,932 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:12,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:12,949 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:12,950 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:12,950 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108010955] [2021-10-13 00:41:12,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108010955] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:12,950 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:12,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:41:12,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377457837] [2021-10-13 00:41:12,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:41:12,951 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:12,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:41:12,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:41:12,952 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:13,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:13,297 INFO L93 Difference]: Finished difference Result 127 states and 153 transitions. [2021-10-13 00:41:13,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 00:41:13,297 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-10-13 00:41:13,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:13,298 INFO L225 Difference]: With dead ends: 127 [2021-10-13 00:41:13,299 INFO L226 Difference]: Without dead ends: 127 [2021-10-13 00:41:13,299 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 210.7ms TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:41:13,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-10-13 00:41:13,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2021-10-13 00:41:13,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 93 states have (on average 1.4946236559139785) internal successors, (139), 113 states have internal predecessors, (139), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:41:13,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2021-10-13 00:41:13,305 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 37 [2021-10-13 00:41:13,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:13,306 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2021-10-13 00:41:13,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:13,306 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2021-10-13 00:41:13,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-13 00:41:13,307 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:13,308 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:13,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-10-13 00:41:13,308 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:13,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:13,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1546287057, now seen corresponding path program 1 times [2021-10-13 00:41:13,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:13,309 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748973168] [2021-10-13 00:41:13,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:13,309 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:13,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:13,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:13,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:13,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:13,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:13,594 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:13,594 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:13,595 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748973168] [2021-10-13 00:41:13,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748973168] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:13,595 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:13,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-10-13 00:41:13,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676977540] [2021-10-13 00:41:13,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 00:41:13,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:13,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 00:41:13,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:41:13,597 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:14,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:14,309 INFO L93 Difference]: Finished difference Result 188 states and 230 transitions. [2021-10-13 00:41:14,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-13 00:41:14,309 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-10-13 00:41:14,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:14,311 INFO L225 Difference]: With dead ends: 188 [2021-10-13 00:41:14,311 INFO L226 Difference]: Without dead ends: 188 [2021-10-13 00:41:14,312 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 388.9ms TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-10-13 00:41:14,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-10-13 00:41:14,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 150. [2021-10-13 00:41:14,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 115 states have (on average 1.4956521739130435) internal successors, (172), 137 states have internal predecessors, (172), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:41:14,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 188 transitions. [2021-10-13 00:41:14,320 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 188 transitions. Word has length 37 [2021-10-13 00:41:14,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:14,320 INFO L470 AbstractCegarLoop]: Abstraction has 150 states and 188 transitions. [2021-10-13 00:41:14,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 10 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:14,321 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 188 transitions. [2021-10-13 00:41:14,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-10-13 00:41:14,321 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:14,321 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:14,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-10-13 00:41:14,322 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:14,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:14,322 INFO L82 PathProgramCache]: Analyzing trace with hash 1545856107, now seen corresponding path program 1 times [2021-10-13 00:41:14,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:14,323 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266645511] [2021-10-13 00:41:14,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:14,323 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:14,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:14,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:14,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:14,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:14,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:14,473 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:14,474 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:14,474 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266645511] [2021-10-13 00:41:14,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266645511] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:14,474 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:14,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-13 00:41:14,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295710941] [2021-10-13 00:41:14,475 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 00:41:14,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:14,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 00:41:14,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:14,476 INFO L87 Difference]: Start difference. First operand 150 states and 188 transitions. Second operand has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:15,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:15,019 INFO L93 Difference]: Finished difference Result 182 states and 226 transitions. [2021-10-13 00:41:15,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-13 00:41:15,020 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-10-13 00:41:15,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:15,021 INFO L225 Difference]: With dead ends: 182 [2021-10-13 00:41:15,021 INFO L226 Difference]: Without dead ends: 182 [2021-10-13 00:41:15,022 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 250.7ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-10-13 00:41:15,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-10-13 00:41:15,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 156. [2021-10-13 00:41:15,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 121 states have (on average 1.4793388429752066) internal successors, (179), 143 states have internal predecessors, (179), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:41:15,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2021-10-13 00:41:15,029 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 37 [2021-10-13 00:41:15,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:15,029 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2021-10-13 00:41:15,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:15,030 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2021-10-13 00:41:15,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-10-13 00:41:15,030 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:15,031 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:15,031 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-10-13 00:41:15,031 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:15,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:15,032 INFO L82 PathProgramCache]: Analyzing trace with hash 676899142, now seen corresponding path program 1 times [2021-10-13 00:41:15,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:15,032 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679814004] [2021-10-13 00:41:15,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:15,032 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:15,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:15,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:15,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:15,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:15,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:15,119 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:15,119 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:15,120 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679814004] [2021-10-13 00:41:15,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679814004] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:15,120 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:15,120 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-10-13 00:41:15,120 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173262550] [2021-10-13 00:41:15,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 00:41:15,121 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:15,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 00:41:15,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-10-13 00:41:15,122 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:15,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:15,388 INFO L93 Difference]: Finished difference Result 155 states and 193 transitions. [2021-10-13 00:41:15,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:41:15,389 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), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 38 [2021-10-13 00:41:15,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:15,392 INFO L225 Difference]: With dead ends: 155 [2021-10-13 00:41:15,392 INFO L226 Difference]: Without dead ends: 155 [2021-10-13 00:41:15,392 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 144.7ms TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:15,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-10-13 00:41:15,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 155. [2021-10-13 00:41:15,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 121 states have (on average 1.462809917355372) internal successors, (177), 142 states have internal predecessors, (177), 7 states have call successors, (7), 7 states have call predecessors, (7), 7 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:41:15,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 193 transitions. [2021-10-13 00:41:15,421 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 193 transitions. Word has length 38 [2021-10-13 00:41:15,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:15,421 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 193 transitions. [2021-10-13 00:41:15,422 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), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:15,422 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 193 transitions. [2021-10-13 00:41:15,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-10-13 00:41:15,422 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:15,423 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:15,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-10-13 00:41:15,423 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:15,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:15,424 INFO L82 PathProgramCache]: Analyzing trace with hash -76822310, now seen corresponding path program 1 times [2021-10-13 00:41:15,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:15,424 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310185522] [2021-10-13 00:41:15,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:15,424 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:15,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:15,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:15,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:15,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:15,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:15,715 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:15,715 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:15,716 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310185522] [2021-10-13 00:41:15,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310185522] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:15,716 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:15,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-10-13 00:41:15,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295287992] [2021-10-13 00:41:15,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 00:41:15,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:15,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 00:41:15,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-10-13 00:41:15,718 INFO L87 Difference]: Start difference. First operand 155 states and 193 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:16,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:16,640 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2021-10-13 00:41:16,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-13 00:41:16,642 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 39 [2021-10-13 00:41:16,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:16,643 INFO L225 Difference]: With dead ends: 151 [2021-10-13 00:41:16,643 INFO L226 Difference]: Without dead ends: 151 [2021-10-13 00:41:16,644 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 624.8ms TimeCoverageRelationStatistics Valid=162, Invalid=768, Unknown=0, NotChecked=0, Total=930 [2021-10-13 00:41:16,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-10-13 00:41:16,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2021-10-13 00:41:16,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 113 states have (on average 1.424778761061947) internal successors, (161), 132 states have internal predecessors, (161), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:41:16,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 175 transitions. [2021-10-13 00:41:16,650 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 175 transitions. Word has length 39 [2021-10-13 00:41:16,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:16,651 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 175 transitions. [2021-10-13 00:41:16,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:16,651 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 175 transitions. [2021-10-13 00:41:16,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-10-13 00:41:16,652 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:16,652 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:16,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-10-13 00:41:16,653 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:16,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:16,653 INFO L82 PathProgramCache]: Analyzing trace with hash -490962994, now seen corresponding path program 1 times [2021-10-13 00:41:16,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:16,654 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844750456] [2021-10-13 00:41:16,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:16,654 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:16,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:16,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:16,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:16,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:16,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:16,875 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:16,875 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:16,875 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844750456] [2021-10-13 00:41:16,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844750456] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:16,875 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:16,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-13 00:41:16,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478227356] [2021-10-13 00:41:16,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-13 00:41:16,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:16,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-13 00:41:16,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-10-13 00:41:16,879 INFO L87 Difference]: Start difference. First operand 145 states and 175 transitions. Second operand has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:41:17,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:17,516 INFO L93 Difference]: Finished difference Result 173 states and 208 transitions. [2021-10-13 00:41:17,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-10-13 00:41:17,516 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2021-10-13 00:41:17,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:17,518 INFO L225 Difference]: With dead ends: 173 [2021-10-13 00:41:17,518 INFO L226 Difference]: Without dead ends: 173 [2021-10-13 00:41:17,519 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 351.2ms TimeCoverageRelationStatistics Valid=113, Invalid=589, Unknown=0, NotChecked=0, Total=702 [2021-10-13 00:41:17,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-10-13 00:41:17,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 149. [2021-10-13 00:41:17,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 117 states have (on average 1.4188034188034189) internal successors, (166), 136 states have internal predecessors, (166), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-10-13 00:41:17,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 180 transitions. [2021-10-13 00:41:17,525 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 180 transitions. Word has length 39 [2021-10-13 00:41:17,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:17,526 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 180 transitions. [2021-10-13 00:41:17,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.5384615384615383) internal successors, (33), 11 states have internal predecessors, (33), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-10-13 00:41:17,526 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 180 transitions. [2021-10-13 00:41:17,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-10-13 00:41:17,527 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:17,527 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 00:41:17,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-10-13 00:41:17,527 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:17,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:17,528 INFO L82 PathProgramCache]: Analyzing trace with hash -2016451191, now seen corresponding path program 2 times [2021-10-13 00:41:17,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:17,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974234884] [2021-10-13 00:41:17,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:17,529 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:17,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:17,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:17,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:17,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:17,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:17,643 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:17,643 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:17,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974234884] [2021-10-13 00:41:17,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974234884] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:17,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423285729] [2021-10-13 00:41:17,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 00:41:17,644 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:17,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:17,645 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:17,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-10-13 00:41:17,870 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 00:41:17,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 00:41:17,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 00:41:17,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:18,034 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:18,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423285729] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:18,035 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:18,035 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-10-13 00:41:18,035 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244726096] [2021-10-13 00:41:18,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-10-13 00:41:18,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:18,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-10-13 00:41:18,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-10-13 00:41:18,037 INFO L87 Difference]: Start difference. First operand 149 states and 180 transitions. Second operand has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:18,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:18,265 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2021-10-13 00:41:18,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 00:41:18,266 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 40 [2021-10-13 00:41:18,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:18,266 INFO L225 Difference]: With dead ends: 100 [2021-10-13 00:41:18,266 INFO L226 Difference]: Without dead ends: 89 [2021-10-13 00:41:18,267 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 118.0ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:41:18,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-10-13 00:41:18,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-10-13 00:41:18,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 66 states have (on average 1.2878787878787878) internal successors, (85), 80 states have internal predecessors, (85), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:41:18,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 94 transitions. [2021-10-13 00:41:18,270 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 94 transitions. Word has length 40 [2021-10-13 00:41:18,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:18,271 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 94 transitions. [2021-10-13 00:41:18,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-13 00:41:18,271 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 94 transitions. [2021-10-13 00:41:18,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-13 00:41:18,272 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:18,272 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:18,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:18,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-10-13 00:41:18,479 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:18,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:18,480 INFO L82 PathProgramCache]: Analyzing trace with hash -811741562, now seen corresponding path program 1 times [2021-10-13 00:41:18,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:18,480 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043936547] [2021-10-13 00:41:18,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:18,480 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:18,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:18,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:18,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:18,670 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:18,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:18,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:18,898 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:18,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043936547] [2021-10-13 00:41:18,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043936547] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:18,898 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128156561] [2021-10-13 00:41:18,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:18,899 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:18,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:18,900 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:18,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-13 00:41:19,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:19,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 61 conjunts are in the unsatisfiable core [2021-10-13 00:41:19,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:19,255 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 [2021-10-13 00:41:19,295 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:41:19,296 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 [2021-10-13 00:41:19,327 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 13 treesize of output 9 [2021-10-13 00:41:19,370 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 28 treesize of output 23 [2021-10-13 00:41:19,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:19,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:19,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 18 treesize of output 22 [2021-10-13 00:41:19,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:19,490 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-13 00:41:19,491 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 56 treesize of output 43 [2021-10-13 00:41:20,295 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 83 treesize of output 75 [2021-10-13 00:41:20,555 INFO L354 Elim1Store]: treesize reduction 42, result has 2.3 percent of original size [2021-10-13 00:41:20,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-10-13 00:41:20,563 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:20,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128156561] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:20,564 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:20,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 30 [2021-10-13 00:41:20,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015740244] [2021-10-13 00:41:20,565 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-10-13 00:41:20,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:20,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-10-13 00:41:20,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=856, Unknown=0, NotChecked=0, Total=930 [2021-10-13 00:41:20,567 INFO L87 Difference]: Start difference. First operand 89 states and 94 transitions. Second operand has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:22,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:22,653 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2021-10-13 00:41:22,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-10-13 00:41:22,655 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-10-13 00:41:22,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:22,656 INFO L225 Difference]: With dead ends: 102 [2021-10-13 00:41:22,656 INFO L226 Difference]: Without dead ends: 102 [2021-10-13 00:41:22,657 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 1881.9ms TimeCoverageRelationStatistics Valid=260, Invalid=2092, Unknown=0, NotChecked=0, Total=2352 [2021-10-13 00:41:22,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-10-13 00:41:22,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2021-10-13 00:41:22,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 68 states have (on average 1.2941176470588236) internal successors, (88), 82 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:41:22,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2021-10-13 00:41:22,661 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 41 [2021-10-13 00:41:22,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:22,662 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2021-10-13 00:41:22,662 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 25 states have internal predecessors, (59), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:22,662 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2021-10-13 00:41:22,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-13 00:41:22,663 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:22,663 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:22,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:22,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-10-13 00:41:22,891 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:22,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:22,892 INFO L82 PathProgramCache]: Analyzing trace with hash -811741561, now seen corresponding path program 1 times [2021-10-13 00:41:22,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:22,892 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184381506] [2021-10-13 00:41:22,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:22,892 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:22,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:23,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:23,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:23,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:23,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:23,656 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:23,656 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:23,656 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184381506] [2021-10-13 00:41:23,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184381506] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:23,656 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703740873] [2021-10-13 00:41:23,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:23,657 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:23,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:23,659 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:23,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 00:41:23,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:23,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 76 conjunts are in the unsatisfiable core [2021-10-13 00:41:23,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:24,051 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 [2021-10-13 00:41:24,172 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:41:24,172 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 [2021-10-13 00:41:24,255 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 13 treesize of output 9 [2021-10-13 00:41:24,261 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 13 treesize of output 9 [2021-10-13 00:41:24,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:24,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-13 00:41:24,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:24,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-13 00:41:24,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:24,478 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:41:24,495 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-10-13 00:41:24,496 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 2 case distinctions, treesize of input 95 treesize of output 70 [2021-10-13 00:41:24,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:24,502 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:41:24,513 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-10-13 00:41:24,514 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 85 treesize of output 81 [2021-10-13 00:41:26,215 INFO L354 Elim1Store]: treesize reduction 65, result has 11.0 percent of original size [2021-10-13 00:41:26,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 140 treesize of output 73 [2021-10-13 00:41:26,233 INFO L354 Elim1Store]: treesize reduction 46, result has 6.1 percent of original size [2021-10-13 00:41:26,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 37 [2021-10-13 00:41:26,350 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:26,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703740873] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:26,350 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:26,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 41 [2021-10-13 00:41:26,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465228012] [2021-10-13 00:41:26,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-10-13 00:41:26,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:26,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-10-13 00:41:26,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1626, Unknown=0, NotChecked=0, Total=1722 [2021-10-13 00:41:26,353 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:30,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:30,983 INFO L93 Difference]: Finished difference Result 113 states and 120 transitions. [2021-10-13 00:41:30,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-13 00:41:30,984 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-10-13 00:41:30,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:30,985 INFO L225 Difference]: With dead ends: 113 [2021-10-13 00:41:30,985 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 00:41:30,987 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 4600.9ms TimeCoverageRelationStatistics Valid=346, Invalid=3686, Unknown=0, NotChecked=0, Total=4032 [2021-10-13 00:41:30,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 00:41:30,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 99. [2021-10-13 00:41:30,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 75 states have (on average 1.3066666666666666) internal successors, (98), 90 states have internal predecessors, (98), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:41:30,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 108 transitions. [2021-10-13 00:41:30,992 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 108 transitions. Word has length 41 [2021-10-13 00:41:30,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:30,992 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 108 transitions. [2021-10-13 00:41:30,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 1.725) internal successors, (69), 36 states have internal predecessors, (69), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:30,993 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 108 transitions. [2021-10-13 00:41:30,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-13 00:41:30,994 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:30,994 INFO L512 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] [2021-10-13 00:41:31,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:31,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-10-13 00:41:31,207 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting dll_remove_lastErr17REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:31,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:31,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1600408080, now seen corresponding path program 1 times [2021-10-13 00:41:31,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:31,208 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377306293] [2021-10-13 00:41:31,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:31,208 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:31,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:31,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:31,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:31,318 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:31,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:31,330 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:31,330 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:31,330 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377306293] [2021-10-13 00:41:31,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377306293] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:31,331 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244241102] [2021-10-13 00:41:31,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:31,331 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:31,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:31,332 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:31,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-10-13 00:41:31,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:31,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 00:41:31,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:31,923 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 7 treesize of output 3 [2021-10-13 00:41:31,948 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:31,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244241102] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:31,948 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:31,948 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3] total 8 [2021-10-13 00:41:31,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808946911] [2021-10-13 00:41:31,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:41:31,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:31,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:41:31,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:41:31,950 INFO L87 Difference]: Start difference. First operand 99 states and 108 transitions. Second operand has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:32,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:32,425 INFO L93 Difference]: Finished difference Result 99 states and 106 transitions. [2021-10-13 00:41:32,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-13 00:41:32,426 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 43 [2021-10-13 00:41:32,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:32,427 INFO L225 Difference]: With dead ends: 99 [2021-10-13 00:41:32,427 INFO L226 Difference]: Without dead ends: 99 [2021-10-13 00:41:32,428 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 303.2ms TimeCoverageRelationStatistics Valid=81, Invalid=225, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:41:32,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-10-13 00:41:32,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2021-10-13 00:41:32,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 75 states have (on average 1.28) internal successors, (96), 89 states have internal predecessors, (96), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:41:32,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2021-10-13 00:41:32,434 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 43 [2021-10-13 00:41:32,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:32,435 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2021-10-13 00:41:32,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 1 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-13 00:41:32,435 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2021-10-13 00:41:32,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-10-13 00:41:32,436 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:32,436 INFO L512 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] [2021-10-13 00:41:32,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:32,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-10-13 00:41:32,657 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting dll_remove_lastErr18REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:32,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:32,658 INFO L82 PathProgramCache]: Analyzing trace with hash 1600408081, now seen corresponding path program 1 times [2021-10-13 00:41:32,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:32,658 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426846593] [2021-10-13 00:41:32,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:32,658 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:32,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:32,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:32,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:32,954 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:32,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:33,046 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:33,046 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:33,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426846593] [2021-10-13 00:41:33,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426846593] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:33,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728866771] [2021-10-13 00:41:33,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:33,046 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:33,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:33,047 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:33,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-10-13 00:41:33,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:33,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 00:41:33,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:33,524 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 7 treesize of output 3 [2021-10-13 00:41:33,603 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:33,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728866771] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:33,603 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:33,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 3] total 17 [2021-10-13 00:41:33,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972923361] [2021-10-13 00:41:33,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-13 00:41:33,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:33,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-13 00:41:33,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:41:33,604 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:41:34,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:34,863 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2021-10-13 00:41:34,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-10-13 00:41:34,863 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 43 [2021-10-13 00:41:34,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:34,864 INFO L225 Difference]: With dead ends: 107 [2021-10-13 00:41:34,864 INFO L226 Difference]: Without dead ends: 107 [2021-10-13 00:41:34,865 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 958.7ms TimeCoverageRelationStatistics Valid=248, Invalid=1234, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 00:41:34,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-13 00:41:34,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 95. [2021-10-13 00:41:34,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 74 states have (on average 1.2432432432432432) internal successors, (92), 86 states have internal predecessors, (92), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:41:34,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 102 transitions. [2021-10-13 00:41:34,869 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 102 transitions. Word has length 43 [2021-10-13 00:41:34,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:34,870 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 102 transitions. [2021-10-13 00:41:34,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 14 states have internal predecessors, (59), 2 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:41:34,870 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 102 transitions. [2021-10-13 00:41:34,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-10-13 00:41:34,871 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:34,871 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:34,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:35,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:35,075 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting mainErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:35,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:35,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1924081036, now seen corresponding path program 1 times [2021-10-13 00:41:35,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:35,076 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918220720] [2021-10-13 00:41:35,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:35,076 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:35,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,119 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:35,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:35,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:41:35,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,170 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:35,171 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:35,171 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918220720] [2021-10-13 00:41:35,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918220720] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:41:35,171 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:41:35,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-10-13 00:41:35,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991868714] [2021-10-13 00:41:35,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:41:35,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:35,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:41:35,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-10-13 00:41:35,173 INFO L87 Difference]: Start difference. First operand 95 states and 102 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:41:35,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:35,431 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2021-10-13 00:41:35,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 00:41:35,432 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-10-13 00:41:35,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:35,433 INFO L225 Difference]: With dead ends: 103 [2021-10-13 00:41:35,433 INFO L226 Difference]: Without dead ends: 103 [2021-10-13 00:41:35,433 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 152.2ms TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:41:35,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-13 00:41:35,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-13 00:41:35,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2375) internal successors, (99), 92 states have internal predecessors, (99), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-10-13 00:41:35,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 114 transitions. [2021-10-13 00:41:35,437 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 114 transitions. Word has length 44 [2021-10-13 00:41:35,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:35,437 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 114 transitions. [2021-10-13 00:41:35,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:41:35,438 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 114 transitions. [2021-10-13 00:41:35,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-13 00:41:35,438 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:35,438 INFO L512 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] [2021-10-13 00:41:35,438 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-10-13 00:41:35,439 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:35,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:35,439 INFO L82 PathProgramCache]: Analyzing trace with hash 393874640, now seen corresponding path program 1 times [2021-10-13 00:41:35,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:35,439 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097929107] [2021-10-13 00:41:35,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:35,439 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:35,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:35,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:35,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:35,928 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:35,928 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:35,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097929107] [2021-10-13 00:41:35,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097929107] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:35,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309390731] [2021-10-13 00:41:35,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:35,929 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:35,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:35,931 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:35,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 00:41:36,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:36,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 56 conjunts are in the unsatisfiable core [2021-10-13 00:41:36,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:36,371 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 [2021-10-13 00:41:36,458 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:41:36,458 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 [2021-10-13 00:41:36,494 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 13 treesize of output 9 [2021-10-13 00:41:36,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:36,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2021-10-13 00:41:36,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:36,629 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-13 00:41:36,629 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 56 treesize of output 43 [2021-10-13 00:41:37,292 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 83 treesize of output 75 [2021-10-13 00:41:37,539 INFO L354 Elim1Store]: treesize reduction 42, result has 2.3 percent of original size [2021-10-13 00:41:37,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 73 treesize of output 25 [2021-10-13 00:41:37,564 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:37,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309390731] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:37,564 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:37,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 32 [2021-10-13 00:41:37,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975245248] [2021-10-13 00:41:37,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-10-13 00:41:37,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:37,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-10-13 00:41:37,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=972, Unknown=0, NotChecked=0, Total=1056 [2021-10-13 00:41:37,571 INFO L87 Difference]: Start difference. First operand 103 states and 114 transitions. Second operand has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:39,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:39,461 INFO L93 Difference]: Finished difference Result 112 states and 123 transitions. [2021-10-13 00:41:39,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-10-13 00:41:39,462 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-10-13 00:41:39,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:39,463 INFO L225 Difference]: With dead ends: 112 [2021-10-13 00:41:39,464 INFO L226 Difference]: Without dead ends: 112 [2021-10-13 00:41:39,465 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 398 ImplicationChecksByTransitivity, 1701.4ms TimeCoverageRelationStatistics Valid=261, Invalid=2189, Unknown=0, NotChecked=0, Total=2450 [2021-10-13 00:41:39,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-10-13 00:41:39,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 103. [2021-10-13 00:41:39,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.225) internal successors, (98), 92 states have internal predecessors, (98), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-10-13 00:41:39,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 113 transitions. [2021-10-13 00:41:39,469 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 113 transitions. Word has length 45 [2021-10-13 00:41:39,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:39,469 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 113 transitions. [2021-10-13 00:41:39,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 2.064516129032258) internal successors, (64), 27 states have internal predecessors, (64), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:39,470 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 113 transitions. [2021-10-13 00:41:39,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-10-13 00:41:39,470 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:39,471 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:39,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:39,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:39,695 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:39,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:39,696 INFO L82 PathProgramCache]: Analyzing trace with hash 393927228, now seen corresponding path program 2 times [2021-10-13 00:41:39,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:39,696 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025005497] [2021-10-13 00:41:39,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:39,696 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:39,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:40,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:40,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:40,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:40,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:40,801 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:40,802 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:40,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025005497] [2021-10-13 00:41:40,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025005497] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:40,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643942495] [2021-10-13 00:41:40,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 00:41:40,802 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:40,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:40,808 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:40,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-10-13 00:41:41,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 00:41:41,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 00:41:41,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 87 conjunts are in the unsatisfiable core [2021-10-13 00:41:41,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:41,409 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 [2021-10-13 00:41:41,452 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 13 treesize of output 9 [2021-10-13 00:41:41,457 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 13 treesize of output 9 [2021-10-13 00:41:41,493 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 0 case distinctions, treesize of input 28 treesize of output 23 [2021-10-13 00:41:41,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:41,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:41,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 18 treesize of output 22 [2021-10-13 00:41:41,503 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 0 case distinctions, treesize of input 28 treesize of output 23 [2021-10-13 00:41:41,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:41,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:41,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 18 treesize of output 22 [2021-10-13 00:41:41,689 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:41:41,690 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 [2021-10-13 00:41:41,785 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 30 treesize of output 21 [2021-10-13 00:41:41,794 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 30 treesize of output 21 [2021-10-13 00:41:41,837 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 28 treesize of output 30 [2021-10-13 00:41:41,864 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 28 treesize of output 30 [2021-10-13 00:41:41,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:41,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-10-13 00:41:41,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:41,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2021-10-13 00:41:42,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:42,136 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:41:42,136 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:41:42,145 INFO L354 Elim1Store]: treesize reduction 35, result has 20.5 percent of original size [2021-10-13 00:41:42,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 136 treesize of output 92 [2021-10-13 00:41:42,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:41:42,155 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:41:42,157 INFO L173 IndexEqualityManager]: detected equality via solver [2021-10-13 00:41:42,165 INFO L354 Elim1Store]: treesize reduction 59, result has 13.2 percent of original size [2021-10-13 00:41:42,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 113 treesize of output 102 [2021-10-13 00:41:43,900 INFO L354 Elim1Store]: treesize reduction 166, result has 6.2 percent of original size [2021-10-13 00:41:43,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 11 new quantified variables, introduced 21 case distinctions, treesize of input 197 treesize of output 105 [2021-10-13 00:41:43,946 INFO L354 Elim1Store]: treesize reduction 126, result has 5.3 percent of original size [2021-10-13 00:41:43,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 66 treesize of output 46 [2021-10-13 00:41:43,997 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:43,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643942495] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:43,997 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:43,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 46 [2021-10-13 00:41:43,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495930618] [2021-10-13 00:41:43,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-10-13 00:41:43,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:43,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-10-13 00:41:43,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1941, Unknown=0, NotChecked=0, Total=2070 [2021-10-13 00:41:43,999 INFO L87 Difference]: Start difference. First operand 103 states and 113 transitions. Second operand has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:49,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:49,301 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2021-10-13 00:41:49,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-13 00:41:49,301 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2021-10-13 00:41:49,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:49,302 INFO L225 Difference]: With dead ends: 103 [2021-10-13 00:41:49,303 INFO L226 Difference]: Without dead ends: 103 [2021-10-13 00:41:49,305 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 3926.9ms TimeCoverageRelationStatistics Valid=360, Invalid=4196, Unknown=0, NotChecked=0, Total=4556 [2021-10-13 00:41:49,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-10-13 00:41:49,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-10-13 00:41:49,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 80 states have (on average 1.2125) internal successors, (97), 92 states have internal predecessors, (97), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 4 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-13 00:41:49,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 111 transitions. [2021-10-13 00:41:49,310 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 111 transitions. Word has length 45 [2021-10-13 00:41:49,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:49,310 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 111 transitions. [2021-10-13 00:41:49,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.6222222222222222) internal successors, (73), 40 states have internal predecessors, (73), 4 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:41:49,311 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 111 transitions. [2021-10-13 00:41:49,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-10-13 00:41:49,311 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:49,312 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:49,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:49,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-10-13 00:41:49,527 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:49,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:49,528 INFO L82 PathProgramCache]: Analyzing trace with hash 2089031702, now seen corresponding path program 1 times [2021-10-13 00:41:49,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:49,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705165947] [2021-10-13 00:41:49,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:49,528 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:49,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:49,589 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:49,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:49,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:49,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:49,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:41:49,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:49,641 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:49,642 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:49,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705165947] [2021-10-13 00:41:49,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705165947] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:49,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84506588] [2021-10-13 00:41:49,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:49,643 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:49,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:49,644 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:49,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-10-13 00:41:50,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:50,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 00:41:50,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:50,470 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:50,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84506588] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:50,470 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:50,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2021-10-13 00:41:50,471 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654718771] [2021-10-13 00:41:50,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:41:50,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:50,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:41:50,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:41:50,472 INFO L87 Difference]: Start difference. First operand 103 states and 111 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:41:50,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:50,679 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-10-13 00:41:50,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 00:41:50,679 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 46 [2021-10-13 00:41:50,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:50,680 INFO L225 Difference]: With dead ends: 107 [2021-10-13 00:41:50,680 INFO L226 Difference]: Without dead ends: 107 [2021-10-13 00:41:50,681 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 83.3ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-10-13 00:41:50,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-13 00:41:50,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-10-13 00:41:50,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 84 states have (on average 1.2023809523809523) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-10-13 00:41:50,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-10-13 00:41:50,685 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 46 [2021-10-13 00:41:50,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:50,686 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-10-13 00:41:50,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 6 states have internal predecessors, (38), 4 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:41:50,686 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-10-13 00:41:50,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-10-13 00:41:50,687 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:50,687 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:50,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:50,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-10-13 00:41:50,907 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:50,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:50,908 INFO L82 PathProgramCache]: Analyzing trace with hash 339086038, now seen corresponding path program 1 times [2021-10-13 00:41:50,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:50,908 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018846945] [2021-10-13 00:41:50,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:50,908 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:50,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:51,019 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:51,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:51,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:51,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:51,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:41:51,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:51,522 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:51,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:51,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018846945] [2021-10-13 00:41:51,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018846945] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:51,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421531278] [2021-10-13 00:41:51,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:51,523 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:51,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:51,528 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:51,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-13 00:41:52,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:52,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 47 conjunts are in the unsatisfiable core [2021-10-13 00:41:52,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:52,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:41:52,188 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:41:52,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2021-10-13 00:41:52,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:41:52,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:41:52,407 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-10-13 00:41:52,407 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 45 treesize of output 38 [2021-10-13 00:41:53,040 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 25 treesize of output 17 [2021-10-13 00:41:53,121 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:41:53,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421531278] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:53,121 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:53,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 39 [2021-10-13 00:41:53,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167007309] [2021-10-13 00:41:53,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-10-13 00:41:53,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:53,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-10-13 00:41:53,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1377, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 00:41:53,123 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:41:54,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:54,967 INFO L93 Difference]: Finished difference Result 105 states and 112 transitions. [2021-10-13 00:41:54,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-13 00:41:54,968 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-10-13 00:41:54,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:54,969 INFO L225 Difference]: With dead ends: 105 [2021-10-13 00:41:54,970 INFO L226 Difference]: Without dead ends: 100 [2021-10-13 00:41:54,971 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1899.6ms TimeCoverageRelationStatistics Valid=331, Invalid=3091, Unknown=0, NotChecked=0, Total=3422 [2021-10-13 00:41:54,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-10-13 00:41:54,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2021-10-13 00:41:54,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 77 states have (on average 1.2077922077922079) internal successors, (93), 88 states have internal predecessors, (93), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-10-13 00:41:54,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2021-10-13 00:41:54,976 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 47 [2021-10-13 00:41:54,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:54,977 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2021-10-13 00:41:54,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 33 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-13 00:41:54,977 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2021-10-13 00:41:54,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-10-13 00:41:54,978 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:54,978 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:41:55,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:55,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:55,203 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting dll_remove_lastErr0REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:55,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:55,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1172150217, now seen corresponding path program 1 times [2021-10-13 00:41:55,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:55,203 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001344490] [2021-10-13 00:41:55,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:55,203 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:55,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:55,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:55,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:55,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:55,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:55,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:41:55,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:55,438 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-10-13 00:41:55,439 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:55,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001344490] [2021-10-13 00:41:55,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001344490] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:55,439 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706973502] [2021-10-13 00:41:55,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:55,440 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:55,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:55,441 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:55,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-10-13 00:41:56,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:56,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-13 00:41:56,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:41:56,196 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 [2021-10-13 00:41:56,226 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 [2021-10-13 00:41:56,463 INFO L354 Elim1Store]: treesize reduction 50, result has 9.1 percent of original size [2021-10-13 00:41:56,463 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 20 treesize of output 19 [2021-10-13 00:41:56,500 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 [2021-10-13 00:41:56,632 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:41:56,632 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 [2021-10-13 00:41:56,805 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-10-13 00:41:56,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706973502] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:56,806 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:41:56,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-10-13 00:41:56,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900766178] [2021-10-13 00:41:56,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-10-13 00:41:56,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:41:56,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-10-13 00:41:56,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=528, Unknown=0, NotChecked=0, Total=600 [2021-10-13 00:41:56,807 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:41:58,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:41:58,347 INFO L93 Difference]: Finished difference Result 126 states and 135 transitions. [2021-10-13 00:41:58,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-10-13 00:41:58,347 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 53 [2021-10-13 00:41:58,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:41:58,349 INFO L225 Difference]: With dead ends: 126 [2021-10-13 00:41:58,349 INFO L226 Difference]: Without dead ends: 126 [2021-10-13 00:41:58,350 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 953.8ms TimeCoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 00:41:58,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-10-13 00:41:58,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 90. [2021-10-13 00:41:58,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 71 states have (on average 1.1830985915492958) internal successors, (84), 80 states have internal predecessors, (84), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:41:58,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2021-10-13 00:41:58,353 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 53 [2021-10-13 00:41:58,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:41:58,354 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2021-10-13 00:41:58,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.4166666666666665) internal successors, (82), 21 states have internal predecessors, (82), 5 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2021-10-13 00:41:58,354 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2021-10-13 00:41:58,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-13 00:41:58,355 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:41:58,355 INFO L512 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] [2021-10-13 00:41:58,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-10-13 00:41:58,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-10-13 00:41:58,555 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:41:58,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:41:58,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1976918352, now seen corresponding path program 1 times [2021-10-13 00:41:58,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:41:58,556 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906993329] [2021-10-13 00:41:58,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:58,557 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:41:58,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:58,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:41:58,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:58,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:41:58,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:58,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:41:58,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:41:59,576 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:41:59,576 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:41:59,576 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906993329] [2021-10-13 00:41:59,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906993329] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:41:59,577 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601070664] [2021-10-13 00:41:59,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:41:59,577 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:41:59,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:41:59,578 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:41:59,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-10-13 00:42:00,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:42:00,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 65 conjunts are in the unsatisfiable core [2021-10-13 00:42:00,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:42:00,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 00:42:00,368 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-10-13 00:42:00,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2021-10-13 00:42:00,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-10-13 00:42:00,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-10-13 00:42:00,669 INFO L354 Elim1Store]: treesize reduction 56, result has 21.1 percent of original size [2021-10-13 00:42:00,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 43 [2021-10-13 00:42:05,768 INFO L354 Elim1Store]: treesize reduction 186, result has 19.8 percent of original size [2021-10-13 00:42:05,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 126 treesize of output 99 [2021-10-13 00:42:05,787 INFO L354 Elim1Store]: treesize reduction 48, result has 28.4 percent of original size [2021-10-13 00:42:05,787 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 3 case distinctions, treesize of input 109 treesize of output 118 [2021-10-13 00:42:08,276 INFO L354 Elim1Store]: treesize reduction 106, result has 17.8 percent of original size [2021-10-13 00:42:08,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 111 treesize of output 80 [2021-10-13 00:42:08,558 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:42:08,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601070664] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:42:08,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:42:08,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 52 [2021-10-13 00:42:08,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987869504] [2021-10-13 00:42:08,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-10-13 00:42:08,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:42:08,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-10-13 00:42:08,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2617, Unknown=1, NotChecked=0, Total=2756 [2021-10-13 00:42:08,561 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:43:35,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:43:35,019 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2021-10-13 00:43:35,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-10-13 00:43:35,020 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-10-13 00:43:35,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:43:35,021 INFO L225 Difference]: With dead ends: 140 [2021-10-13 00:43:35,021 INFO L226 Difference]: Without dead ends: 140 [2021-10-13 00:43:35,025 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2529 ImplicationChecksByTransitivity, 58784.0ms TimeCoverageRelationStatistics Valid=1228, Invalid=10955, Unknown=27, NotChecked=0, Total=12210 [2021-10-13 00:43:35,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-10-13 00:43:35,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 94. [2021-10-13 00:43:35,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 83 states have internal predecessors, (88), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:43:35,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 99 transitions. [2021-10-13 00:43:35,029 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 99 transitions. Word has length 54 [2021-10-13 00:43:35,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:43:35,029 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 99 transitions. [2021-10-13 00:43:35,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 50 states have (on average 1.82) internal successors, (91), 45 states have internal predecessors, (91), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:43:35,029 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 99 transitions. [2021-10-13 00:43:35,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-10-13 00:43:35,030 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:43:35,030 INFO L512 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] [2021-10-13 00:43:35,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-10-13 00:43:35,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:43:35,231 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting dll_remove_lastErr3REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:43:35,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:43:35,231 INFO L82 PathProgramCache]: Analyzing trace with hash -1976918351, now seen corresponding path program 1 times [2021-10-13 00:43:35,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:43:35,231 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459783749] [2021-10-13 00:43:35,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:43:35,231 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:43:35,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:35,407 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:43:35,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:35,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:43:35,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:35,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:43:35,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:35,774 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:43:35,774 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:43:35,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459783749] [2021-10-13 00:43:35,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459783749] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:43:35,774 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752860007] [2021-10-13 00:43:35,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:43:35,774 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:43:35,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:43:35,779 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:43:35,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-13 00:43:36,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:36,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 53 conjunts are in the unsatisfiable core [2021-10-13 00:43:36,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:43:37,109 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-10-13 00:43:37,109 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 67 treesize of output 72 [2021-10-13 00:43:37,550 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-10-13 00:43:37,550 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 45 [2021-10-13 00:43:37,871 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-13 00:43:37,871 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 74 treesize of output 51 [2021-10-13 00:43:37,876 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-13 00:43:37,876 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 24 [2021-10-13 00:43:37,920 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:43:37,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752860007] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:43:37,920 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:43:37,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 37 [2021-10-13 00:43:37,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182483118] [2021-10-13 00:43:37,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-10-13 00:43:37,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:43:37,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-10-13 00:43:37,922 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1304, Unknown=0, NotChecked=0, Total=1406 [2021-10-13 00:43:37,922 INFO L87 Difference]: Start difference. First operand 94 states and 99 transitions. Second operand has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:43:46,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:43:46,336 INFO L93 Difference]: Finished difference Result 154 states and 164 transitions. [2021-10-13 00:43:46,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-10-13 00:43:46,337 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 54 [2021-10-13 00:43:46,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:43:46,338 INFO L225 Difference]: With dead ends: 154 [2021-10-13 00:43:46,339 INFO L226 Difference]: Without dead ends: 154 [2021-10-13 00:43:46,341 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 5529.8ms TimeCoverageRelationStatistics Valid=718, Invalid=4830, Unknown=2, NotChecked=0, Total=5550 [2021-10-13 00:43:46,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-10-13 00:43:46,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 125. [2021-10-13 00:43:46,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2647058823529411) internal successors, (129), 112 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:43:46,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 145 transitions. [2021-10-13 00:43:46,345 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 145 transitions. Word has length 54 [2021-10-13 00:43:46,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:43:46,345 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 145 transitions. [2021-10-13 00:43:46,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 35 states have (on average 2.4) internal successors, (84), 30 states have internal predecessors, (84), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:43:46,346 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 145 transitions. [2021-10-13 00:43:46,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-13 00:43:46,346 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:43:46,346 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:43:46,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-10-13 00:43:46,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-10-13 00:43:46,547 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting dll_remove_lastErr14REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:43:46,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:43:46,547 INFO L82 PathProgramCache]: Analyzing trace with hash 560464247, now seen corresponding path program 1 times [2021-10-13 00:43:46,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:43:46,547 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174893208] [2021-10-13 00:43:46,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:43:46,548 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:43:46,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:46,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:43:46,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:46,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:43:46,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:46,908 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:43:46,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:47,115 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:43:47,115 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:43:47,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174893208] [2021-10-13 00:43:47,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174893208] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:43:47,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092988474] [2021-10-13 00:43:47,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:43:47,115 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:43:47,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:43:47,118 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:43:47,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-10-13 00:43:47,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:47,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 15 conjunts are in the unsatisfiable core [2021-10-13 00:43:47,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:43:47,975 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 39 treesize of output 31 [2021-10-13 00:43:47,977 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 28 treesize of output 16 [2021-10-13 00:43:48,032 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 00:43:48,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092988474] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:43:48,032 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 00:43:48,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [21] total 25 [2021-10-13 00:43:48,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666222657] [2021-10-13 00:43:48,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 00:43:48,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:43:48,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 00:43:48,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=588, Unknown=0, NotChecked=0, Total=650 [2021-10-13 00:43:48,034 INFO L87 Difference]: Start difference. First operand 125 states and 145 transitions. Second operand has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:43:48,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:43:48,169 INFO L93 Difference]: Finished difference Result 127 states and 147 transitions. [2021-10-13 00:43:48,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:43:48,169 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 58 [2021-10-13 00:43:48,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:43:48,170 INFO L225 Difference]: With dead ends: 127 [2021-10-13 00:43:48,170 INFO L226 Difference]: Without dead ends: 127 [2021-10-13 00:43:48,171 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 482.3ms TimeCoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2021-10-13 00:43:48,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-10-13 00:43:48,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2021-10-13 00:43:48,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 102 states have (on average 1.2450980392156863) internal successors, (127), 112 states have internal predecessors, (127), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:43:48,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 143 transitions. [2021-10-13 00:43:48,175 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 143 transitions. Word has length 58 [2021-10-13 00:43:48,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:43:48,175 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 143 transitions. [2021-10-13 00:43:48,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 1 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-10-13 00:43:48,175 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 143 transitions. [2021-10-13 00:43:48,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-10-13 00:43:48,176 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:43:48,176 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:43:48,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-10-13 00:43:48,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:43:48,396 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:43:48,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:43:48,397 INFO L82 PathProgramCache]: Analyzing trace with hash 560033297, now seen corresponding path program 1 times [2021-10-13 00:43:48,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:43:48,397 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047024012] [2021-10-13 00:43:48,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:43:48,397 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:43:48,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:48,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:43:48,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:48,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:43:48,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:48,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:43:48,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:48,799 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:43:48,799 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:43:48,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047024012] [2021-10-13 00:43:48,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047024012] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:43:48,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785243346] [2021-10-13 00:43:48,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:43:48,799 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:43:48,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:43:48,803 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:43:48,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-10-13 00:43:49,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:43:49,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 354 conjuncts, 41 conjunts are in the unsatisfiable core [2021-10-13 00:43:49,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:43:50,057 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 13 treesize of output 9 [2021-10-13 00:43:51,116 WARN L860 $PredicateComparison]: unable to prove that (exists ((dll_remove_last_~snd_to_last~0.offset Int)) (= (let ((.cse0 (select (select |c_old(#memory_$Pointer$.base)| |c_dll_remove_last_#in~head.base|) |c_dll_remove_last_#in~head.offset|))) (store |c_old(#memory_$Pointer$.base)| .cse0 (store (select |c_old(#memory_$Pointer$.base)| .cse0) (+ dll_remove_last_~snd_to_last~0.offset 4) 0))) |c_#memory_$Pointer$.base|)) is different from true [2021-10-13 00:43:51,154 INFO L354 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2021-10-13 00:43:51,155 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 25 [2021-10-13 00:43:51,385 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-10-13 00:43:51,385 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 33 treesize of output 18 [2021-10-13 00:43:51,393 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:43:51,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785243346] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:43:51,393 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:43:51,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17] total 28 [2021-10-13 00:43:51,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022223306] [2021-10-13 00:43:51,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-10-13 00:43:51,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:43:51,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-10-13 00:43:51,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=671, Unknown=1, NotChecked=52, Total=812 [2021-10-13 00:43:51,395 INFO L87 Difference]: Start difference. First operand 125 states and 143 transitions. Second operand has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:44:57,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:44:57,180 INFO L93 Difference]: Finished difference Result 151 states and 161 transitions. [2021-10-13 00:44:57,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-10-13 00:44:57,181 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 58 [2021-10-13 00:44:57,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:44:57,182 INFO L225 Difference]: With dead ends: 151 [2021-10-13 00:44:57,183 INFO L226 Difference]: Without dead ends: 151 [2021-10-13 00:44:57,183 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 66244.7ms TimeCoverageRelationStatistics Valid=503, Invalid=2851, Unknown=72, NotChecked=114, Total=3540 [2021-10-13 00:44:57,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-10-13 00:44:57,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 128. [2021-10-13 00:44:57,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 115 states have internal predecessors, (130), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:44:57,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 146 transitions. [2021-10-13 00:44:57,189 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 146 transitions. Word has length 58 [2021-10-13 00:44:57,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:44:57,190 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 146 transitions. [2021-10-13 00:44:57,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 21 states have internal predecessors, (73), 7 states have call successors, (9), 7 states have call predecessors, (9), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:44:57,190 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 146 transitions. [2021-10-13 00:44:57,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-10-13 00:44:57,191 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:44:57,191 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:44:57,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-10-13 00:44:57,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:44:57,392 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting dll_remove_lastErr9REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:44:57,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:44:57,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1321089012, now seen corresponding path program 1 times [2021-10-13 00:44:57,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:44:57,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723708687] [2021-10-13 00:44:57,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:44:57,393 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:44:57,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:57,539 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:44:57,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:57,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:44:57,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:57,596 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:44:57,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:57,607 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-10-13 00:44:57,608 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:44:57,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723708687] [2021-10-13 00:44:57,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723708687] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:44:57,608 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342350258] [2021-10-13 00:44:57,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:44:57,609 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:44:57,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:44:57,610 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:44:57,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-13 00:44:58,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:58,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 00:44:58,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:44:59,096 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 00:44:59,096 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 [2021-10-13 00:44:59,120 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-10-13 00:44:59,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342350258] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:44:59,121 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-10-13 00:44:59,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 13 [2021-10-13 00:44:59,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123958583] [2021-10-13 00:44:59,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 00:44:59,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:44:59,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 00:44:59,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-10-13 00:44:59,122 INFO L87 Difference]: Start difference. First operand 128 states and 146 transitions. Second operand has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:44:59,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:44:59,328 INFO L93 Difference]: Finished difference Result 129 states and 149 transitions. [2021-10-13 00:44:59,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:44:59,328 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 60 [2021-10-13 00:44:59,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:44:59,329 INFO L225 Difference]: With dead ends: 129 [2021-10-13 00:44:59,329 INFO L226 Difference]: Without dead ends: 129 [2021-10-13 00:44:59,329 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 202.5ms TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-10-13 00:44:59,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-10-13 00:44:59,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 127. [2021-10-13 00:44:59,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 105 states have (on average 1.2285714285714286) internal successors, (129), 114 states have internal predecessors, (129), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (9), 5 states have call predecessors, (9), 6 states have call successors, (9) [2021-10-13 00:44:59,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 145 transitions. [2021-10-13 00:44:59,354 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 145 transitions. Word has length 60 [2021-10-13 00:44:59,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:44:59,354 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 145 transitions. [2021-10-13 00:44:59,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-13 00:44:59,355 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 145 transitions. [2021-10-13 00:44:59,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-10-13 00:44:59,356 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:44:59,356 INFO L512 BasicCegarLoop]: trace histogram [3, 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] [2021-10-13 00:44:59,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-13 00:44:59,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-10-13 00:44:59,563 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting dll_remove_lastErr13REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:44:59,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:44:59,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1108481324, now seen corresponding path program 1 times [2021-10-13 00:44:59,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:44:59,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844762069] [2021-10-13 00:44:59,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:44:59,564 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:44:59,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:59,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:44:59,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:59,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:44:59,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:44:59,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:44:59,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:00,302 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 13 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:00,303 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:00,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844762069] [2021-10-13 00:45:00,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844762069] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:00,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344671015] [2021-10-13 00:45:00,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:00,303 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:00,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:00,305 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:00,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-10-13 00:45:01,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:01,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 74 conjunts are in the unsatisfiable core [2021-10-13 00:45:01,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:02,354 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-10-13 00:45:02,354 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 70 [2021-10-13 00:45:02,694 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 117 treesize of output 116 [2021-10-13 00:45:02,878 INFO L354 Elim1Store]: treesize reduction 55, result has 11.3 percent of original size [2021-10-13 00:45:02,879 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 2 case distinctions, treesize of input 71 treesize of output 47 [2021-10-13 00:45:03,195 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-10-13 00:45:03,196 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 [2021-10-13 00:45:03,543 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-10-13 00:45:03,543 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 78 treesize of output 41 [2021-10-13 00:45:03,553 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-10-13 00:45:03,553 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 35 treesize of output 20 [2021-10-13 00:45:03,624 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:03,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344671015] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:03,624 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:03,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24] total 44 [2021-10-13 00:45:03,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114204735] [2021-10-13 00:45:03,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-10-13 00:45:03,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:03,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-10-13 00:45:03,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1784, Unknown=0, NotChecked=0, Total=1892 [2021-10-13 00:45:03,626 INFO L87 Difference]: Start difference. First operand 127 states and 145 transitions. Second operand has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:08,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:08,674 INFO L93 Difference]: Finished difference Result 117 states and 121 transitions. [2021-10-13 00:45:08,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-13 00:45:08,681 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 62 [2021-10-13 00:45:08,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:08,682 INFO L225 Difference]: With dead ends: 117 [2021-10-13 00:45:08,682 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 00:45:08,682 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 4832.2ms TimeCoverageRelationStatistics Valid=361, Invalid=3929, Unknown=0, NotChecked=0, Total=4290 [2021-10-13 00:45:08,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 00:45:08,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 107. [2021-10-13 00:45:08,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 96 states have internal predecessors, (103), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-13 00:45:08,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2021-10-13 00:45:08,687 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 62 [2021-10-13 00:45:08,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:08,687 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2021-10-13 00:45:08,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 42 states have (on average 2.3095238095238093) internal successors, (97), 36 states have internal predecessors, (97), 7 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-10-13 00:45:08,688 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2021-10-13 00:45:08,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-10-13 00:45:08,689 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:08,689 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:08,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:08,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-10-13 00:45:08,915 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr2ASSERT_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:45:08,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:08,916 INFO L82 PathProgramCache]: Analyzing trace with hash 17828144, now seen corresponding path program 1 times [2021-10-13 00:45:08,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:08,916 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505321078] [2021-10-13 00:45:08,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:08,916 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:08,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:08,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:08,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:09,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:09,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:09,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:45:09,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:09,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-10-13 00:45:09,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:09,079 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-10-13 00:45:09,079 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:09,080 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505321078] [2021-10-13 00:45:09,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505321078] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:09,080 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:09,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-10-13 00:45:09,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612352914] [2021-10-13 00:45:09,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:45:09,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:09,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:45:09,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:45:09,083 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:09,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:09,555 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2021-10-13 00:45:09,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-13 00:45:09,556 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 67 [2021-10-13 00:45:09,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:09,557 INFO L225 Difference]: With dead ends: 107 [2021-10-13 00:45:09,557 INFO L226 Difference]: Without dead ends: 107 [2021-10-13 00:45:09,557 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 254.5ms TimeCoverageRelationStatistics Valid=68, Invalid=204, Unknown=0, NotChecked=0, Total=272 [2021-10-13 00:45:09,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-10-13 00:45:09,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2021-10-13 00:45:09,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 86 states have (on average 1.1744186046511629) internal successors, (101), 94 states have internal predecessors, (101), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-13 00:45:09,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2021-10-13 00:45:09,562 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 67 [2021-10-13 00:45:09,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:09,562 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2021-10-13 00:45:09,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.555555555555555) internal successors, (50), 6 states have internal predecessors, (50), 1 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-10-13 00:45:09,563 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2021-10-13 00:45:09,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-10-13 00:45:09,564 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:09,564 INFO L512 BasicCegarLoop]: trace histogram [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] [2021-10-13 00:45:09,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-10-13 00:45:09,564 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting mainErr3ENSURES_VIOLATIONMEMORY_LEAK === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:45:09,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:09,565 INFO L82 PathProgramCache]: Analyzing trace with hash 17828209, now seen corresponding path program 1 times [2021-10-13 00:45:09,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:09,565 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764805901] [2021-10-13 00:45:09,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:09,566 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:09,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:09,893 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:09,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:09,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:09,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:10,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:45:10,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:11,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-10-13 00:45:11,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:11,518 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 00:45:11,518 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:11,519 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764805901] [2021-10-13 00:45:11,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764805901] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:11,519 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635339984] [2021-10-13 00:45:11,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:11,519 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 00:45:11,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 [2021-10-13 00:45:11,532 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 00:45:11,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-10-13 00:45:12,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:12,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 105 conjunts are in the unsatisfiable core [2021-10-13 00:45:12,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 00:45:12,617 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 [2021-10-13 00:45:12,877 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 13 treesize of output 9 [2021-10-13 00:45:12,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:45:12,966 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 23 treesize of output 22 [2021-10-13 00:45:13,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 00:45:13,138 INFO L354 Elim1Store]: treesize reduction 68, result has 21.8 percent of original size [2021-10-13 00:45:13,138 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 2 case distinctions, treesize of input 75 treesize of output 56 [2021-10-13 00:45:19,171 INFO L354 Elim1Store]: treesize reduction 254, result has 13.0 percent of original size [2021-10-13 00:45:19,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 185 treesize of output 122 [2021-10-13 00:45:19,180 INFO L354 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2021-10-13 00:45:19,180 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 146 treesize of output 131 [2021-10-13 00:45:20,269 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 7 treesize of output 3 [2021-10-13 00:45:20,471 INFO L354 Elim1Store]: treesize reduction 85, result has 8.6 percent of original size [2021-10-13 00:45:20,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 127 treesize of output 74 [2021-10-13 00:45:20,990 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 00:45:20,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635339984] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 00:45:20,990 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-13 00:45:20,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 59 [2021-10-13 00:45:20,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258737795] [2021-10-13 00:45:20,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-10-13 00:45:20,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:20,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-10-13 00:45:20,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=3350, Unknown=1, NotChecked=0, Total=3540 [2021-10-13 00:45:20,992 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-13 00:45:36,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:36,604 INFO L93 Difference]: Finished difference Result 119 states and 126 transitions. [2021-10-13 00:45:36,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-10-13 00:45:36,605 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 67 [2021-10-13 00:45:36,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:36,607 INFO L225 Difference]: With dead ends: 119 [2021-10-13 00:45:36,608 INFO L226 Difference]: Without dead ends: 116 [2021-10-13 00:45:36,609 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 15368.0ms TimeCoverageRelationStatistics Valid=430, Invalid=6047, Unknown=3, NotChecked=0, Total=6480 [2021-10-13 00:45:36,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-10-13 00:45:36,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2021-10-13 00:45:36,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 80 states have (on average 1.125) internal successors, (90), 87 states have internal predecessors, (90), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-10-13 00:45:36,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2021-10-13 00:45:36,614 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 67 [2021-10-13 00:45:36,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:36,614 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2021-10-13 00:45:36,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 57 states have (on average 1.9649122807017543) internal successors, (112), 53 states have internal predecessors, (112), 7 states have call successors, (9), 7 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-10-13 00:45:36,615 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2021-10-13 00:45:36,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-10-13 00:45:36,616 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 00:45:36,616 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2021-10-13 00:45:36,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-10-13 00:45:36,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-10-13 00:45:36,827 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting dll_remove_lastErr2REQUIRES_VIOLATION === [node_createErr0REQUIRES_VIOLATION, node_createErr1REQUIRES_VIOLATION, node_createErr2REQUIRES_VIOLATION, node_createErr3REQUIRES_VIOLATION (and 36 more)] === [2021-10-13 00:45:36,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 00:45:36,828 INFO L82 PathProgramCache]: Analyzing trace with hash 556285180, now seen corresponding path program 1 times [2021-10-13 00:45:36,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-13 00:45:36,828 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459807439] [2021-10-13 00:45:36,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 00:45:36,829 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 00:45:36,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:36,906 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-13 00:45:36,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:36,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-13 00:45:36,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:36,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-10-13 00:45:36,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:36,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-10-13 00:45:36,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 00:45:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-10-13 00:45:37,000 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-13 00:45:37,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459807439] [2021-10-13 00:45:37,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459807439] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 00:45:37,001 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 00:45:37,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-10-13 00:45:37,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169405501] [2021-10-13 00:45:37,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 00:45:37,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-13 00:45:37,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 00:45:37,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-10-13 00:45:37,003 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:37,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 00:45:37,201 INFO L93 Difference]: Finished difference Result 64 states and 63 transitions. [2021-10-13 00:45:37,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-10-13 00:45:37,202 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 68 [2021-10-13 00:45:37,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 00:45:37,202 INFO L225 Difference]: With dead ends: 64 [2021-10-13 00:45:37,202 INFO L226 Difference]: Without dead ends: 0 [2021-10-13 00:45:37,202 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 131.0ms TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-10-13 00:45:37,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-13 00:45:37,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-13 00:45:37,203 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) [2021-10-13 00:45:37,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-13 00:45:37,203 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 68 [2021-10-13 00:45:37,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 00:45:37,203 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-13 00:45:37,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.222222222222222) internal successors, (47), 6 states have internal predecessors, (47), 5 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-13 00:45:37,203 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-13 00:45:37,204 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-13 00:45:37,210 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr0REQUIRES_VIOLATION [2021-10-13 00:45:37,215 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr1REQUIRES_VIOLATION [2021-10-13 00:45:37,215 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr2REQUIRES_VIOLATION [2021-10-13 00:45:37,215 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr3REQUIRES_VIOLATION [2021-10-13 00:45:37,216 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr4REQUIRES_VIOLATION [2021-10-13 00:45:37,216 INFO L764 garLoopResultBuilder]: Registering result SAFE for location node_createErr5REQUIRES_VIOLATION [2021-10-13 00:45:37,216 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr0REQUIRES_VIOLATION [2021-10-13 00:45:37,217 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr1REQUIRES_VIOLATION [2021-10-13 00:45:37,217 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr2REQUIRES_VIOLATION [2021-10-13 00:45:37,217 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr3REQUIRES_VIOLATION [2021-10-13 00:45:37,217 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr4REQUIRES_VIOLATION [2021-10-13 00:45:37,217 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr5REQUIRES_VIOLATION [2021-10-13 00:45:37,218 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr6ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:45:37,218 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr7ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:45:37,218 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr8ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:45:37,219 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr9REQUIRES_VIOLATION [2021-10-13 00:45:37,219 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr10REQUIRES_VIOLATION [2021-10-13 00:45:37,219 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr11REQUIRES_VIOLATION [2021-10-13 00:45:37,219 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr12REQUIRES_VIOLATION [2021-10-13 00:45:37,219 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr13REQUIRES_VIOLATION [2021-10-13 00:45:37,220 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr14REQUIRES_VIOLATION [2021-10-13 00:45:37,220 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr15REQUIRES_VIOLATION [2021-10-13 00:45:37,220 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr16REQUIRES_VIOLATION [2021-10-13 00:45:37,220 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr17REQUIRES_VIOLATION [2021-10-13 00:45:37,220 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr18REQUIRES_VIOLATION [2021-10-13 00:45:37,221 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr19ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:45:37,221 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr20ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:45:37,221 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_remove_lastErr21ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 00:45:37,221 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr0REQUIRES_VIOLATION [2021-10-13 00:45:37,221 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr1REQUIRES_VIOLATION [2021-10-13 00:45:37,222 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr2ASSERT_VIOLATIONMEMORY_LEAK [2021-10-13 00:45:37,222 INFO L764 garLoopResultBuilder]: Registering result SAFE for location mainErr3ENSURES_VIOLATIONMEMORY_LEAK [2021-10-13 00:45:37,222 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr0REQUIRES_VIOLATION [2021-10-13 00:45:37,222 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr1REQUIRES_VIOLATION [2021-10-13 00:45:37,222 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr2REQUIRES_VIOLATION [2021-10-13 00:45:37,223 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr3REQUIRES_VIOLATION [2021-10-13 00:45:37,223 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr4REQUIRES_VIOLATION [2021-10-13 00:45:37,223 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr5REQUIRES_VIOLATION [2021-10-13 00:45:37,223 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr6REQUIRES_VIOLATION [2021-10-13 00:45:37,223 INFO L764 garLoopResultBuilder]: Registering result SAFE for location dll_createErr7REQUIRES_VIOLATION [2021-10-13 00:45:37,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-10-13 00:45:37,238 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 00:45:37,244 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 12:45:37 BoogieIcfgContainer [2021-10-13 00:45:37,245 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 00:45:37,246 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 00:45:37,246 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 00:45:37,246 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 00:45:37,247 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 12:40:57" (3/4) ... [2021-10-13 00:45:37,252 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-13 00:45:37,260 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure reach_error [2021-10-13 00:45:37,260 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_remove_last [2021-10-13 00:45:37,260 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2021-10-13 00:45:37,261 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure myexit [2021-10-13 00:45:37,261 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure dll_create [2021-10-13 00:45:37,261 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2021-10-13 00:45:37,261 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2021-10-13 00:45:37,262 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2021-10-13 00:45:37,262 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure node_create [2021-10-13 00:45:37,273 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 15 nodes and edges [2021-10-13 00:45:37,273 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2021-10-13 00:45:37,274 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-13 00:45:37,274 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-13 00:45:37,338 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/witness.graphml [2021-10-13 00:45:37,339 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 00:45:37,340 INFO L168 Benchmark]: Toolchain (without parser) took 281037.26 ms. Allocated memory was 90.2 MB in the beginning and 255.9 MB in the end (delta: 165.7 MB). Free memory was 54.4 MB in the beginning and 145.2 MB in the end (delta: -90.8 MB). Peak memory consumption was 72.9 MB. Max. memory is 16.1 GB. [2021-10-13 00:45:37,340 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 90.2 MB. Free memory was 60.8 MB in the beginning and 60.8 MB in the end (delta: 31.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 00:45:37,340 INFO L168 Benchmark]: CACSL2BoogieTranslator took 579.30 ms. Allocated memory is still 90.2 MB. Free memory was 54.2 MB in the beginning and 58.8 MB in the end (delta: -4.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 00:45:37,341 INFO L168 Benchmark]: Boogie Preprocessor took 86.13 ms. Allocated memory is still 90.2 MB. Free memory was 58.8 MB in the beginning and 55.9 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 00:45:37,341 INFO L168 Benchmark]: RCFGBuilder took 892.48 ms. Allocated memory was 90.2 MB in the beginning and 121.6 MB in the end (delta: 31.5 MB). Free memory was 55.9 MB in the beginning and 91.9 MB in the end (delta: -36.0 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. [2021-10-13 00:45:37,342 INFO L168 Benchmark]: TraceAbstraction took 279379.93 ms. Allocated memory was 121.6 MB in the beginning and 255.9 MB in the end (delta: 134.2 MB). Free memory was 91.1 MB in the beginning and 148.3 MB in the end (delta: -57.3 MB). Peak memory consumption was 77.6 MB. Max. memory is 16.1 GB. [2021-10-13 00:45:37,342 INFO L168 Benchmark]: Witness Printer took 93.12 ms. Allocated memory is still 255.9 MB. Free memory was 148.3 MB in the beginning and 145.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 00:45:37,345 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 90.2 MB. Free memory was 60.8 MB in the beginning and 60.8 MB in the end (delta: 31.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 579.30 ms. Allocated memory is still 90.2 MB. Free memory was 54.2 MB in the beginning and 58.8 MB in the end (delta: -4.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 86.13 ms. Allocated memory is still 90.2 MB. Free memory was 58.8 MB in the beginning and 55.9 MB in the end (delta: 2.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 892.48 ms. Allocated memory was 90.2 MB in the beginning and 121.6 MB in the end (delta: 31.5 MB). Free memory was 55.9 MB in the beginning and 91.9 MB in the end (delta: -36.0 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 279379.93 ms. Allocated memory was 121.6 MB in the beginning and 255.9 MB in the end (delta: 134.2 MB). Free memory was 91.1 MB in the beginning and 148.3 MB in the end (delta: -57.3 MB). Peak memory consumption was 77.6 MB. Max. memory is 16.1 GB. * Witness Printer took 93.12 ms. Allocated memory is still 255.9 MB. Free memory was 148.3 MB in the beginning and 145.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 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, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - 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: 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]: 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: 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: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 605]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 606]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 606]: 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: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 612]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 614]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 615]: free always succeeds For all program executions holds that free always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 626]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 630]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 618]: all allocated memory was freed For all program executions holds that all allocated memory was freed 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: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 593]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 594]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 596]: 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, 113 locations, 40 error locations. Started 1 CEGAR loops. OverallTime: 279309.7ms, OverallIterations: 40, TraceHistogramMax: 3, EmptinessCheckTime: 53.4ms, AutomataDifference: 212053.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 14.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1623 SDtfs, 6815 SDslu, 7985 SDs, 0 SdLazy, 29178 SolverSat, 1151 SolverUnsat, 62 SolverUnknown, 0 SolverNotchecked, 60777.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2143 GetRequests, 992 SyntacticMatches, 18 SemanticMatches, 1133 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 10122 ImplicationChecksByTransitivity, 173159.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=156occurred in iteration=17, InterpolantAutomatonStates: 663, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 317.9ms AutomataMinimizationTime, 40 MinimizatonAttempts, 468 StatesRemovedByMinimization, 29 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 400.4ms SsaConstructionTime, 1556.9ms SatisfiabilityAnalysisTime, 47757.8ms InterpolantComputationTime, 2654 NumberOfCodeBlocks, 2640 NumberOfCodeBlocksAsserted, 66 NumberOfCheckSat, 2590 ConstructedInterpolants, 199 QuantifiedInterpolants, 34610 SizeOfPredicates, 242 NumberOfNonLiveVariables, 6685 ConjunctsInSsa, 804 ConjunctsInUnsatCore, 64 InterpolantComputations, 19 PerfectInterpolantSequences, 428/779 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 40 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-13 00:45:37,591 WARN L435 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forcibly destroying the process [2021-10-13 00:45:37,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d97f3912-0c3c-494f-b7b7-527e0b3a4cc0/bin/uautomizer-WNIpwEf4Nt/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 137 Received shutdown request...