./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/test-0217_1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/test-0217_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU --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 e4aac8fd1b71e0bd84f9ab8e5c238dc6bf3a295fcb9cebe504ba6d0c9a6a7b7a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:34:55,851 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:34:55,853 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:34:55,891 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:34:55,892 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:34:55,894 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:34:55,896 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:34:55,898 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:34:55,901 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:34:55,902 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:34:55,904 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:34:55,906 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:34:55,906 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:34:55,908 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:34:55,909 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:34:55,911 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:34:55,912 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:34:55,913 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:34:55,916 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:34:55,918 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:34:55,920 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:34:55,922 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:34:55,924 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:34:55,925 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:34:55,929 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:34:55,930 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:34:55,930 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:34:55,932 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:34:55,932 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:34:55,934 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:34:55,934 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:34:55,935 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:34:55,937 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:34:55,938 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:34:55,939 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:34:55,939 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:34:55,940 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:34:55,940 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:34:55,941 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:34:55,942 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:34:55,943 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:34:55,944 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:34:55,969 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:34:55,969 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:34:55,970 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:34:55,970 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:34:55,971 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:34:55,972 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:34:55,972 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:34:55,972 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:34:55,973 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:34:55,973 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:34:55,973 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:34:55,973 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:34:55,974 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:34:55,974 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:34:55,974 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:34:55,974 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:34:55,975 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:34:55,975 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:34:55,975 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:34:55,975 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:34:55,976 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:34:55,976 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:34:55,976 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:34:55,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:34:55,977 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:34:55,977 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:34:55,977 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:34:55,978 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:34:55,978 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:34:55,978 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_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e4aac8fd1b71e0bd84f9ab8e5c238dc6bf3a295fcb9cebe504ba6d0c9a6a7b7a [2021-11-02 22:34:56,254 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:34:56,277 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:34:56,280 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:34:56,281 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:34:56,282 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:34:56,283 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/list-ext-properties/test-0217_1.i [2021-11-02 22:34:56,355 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/data/0bc11610e/e6b5c7be0ce74df8915e72512f853ebc/FLAG5e789759b [2021-11-02 22:34:56,940 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:34:56,941 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/sv-benchmarks/c/list-ext-properties/test-0217_1.i [2021-11-02 22:34:56,967 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/data/0bc11610e/e6b5c7be0ce74df8915e72512f853ebc/FLAG5e789759b [2021-11-02 22:34:57,231 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/data/0bc11610e/e6b5c7be0ce74df8915e72512f853ebc [2021-11-02 22:34:57,234 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:34:57,236 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:34:57,238 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:34:57,238 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:34:57,242 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:34:57,243 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:57,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6131fded and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57, skipping insertion in model container [2021-11-02 22:34:57,244 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:57,253 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:34:57,309 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:34:57,827 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:34:57,846 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:34:57,912 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:34:57,956 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:34:57,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57 WrapperNode [2021-11-02 22:34:57,957 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:34:57,958 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:34:57,958 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:34:57,958 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:34:57,972 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:57,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,004 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,005 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,037 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,045 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,064 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,075 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:34:58,076 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:34:58,076 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:34:58,077 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:34:58,078 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (1/1) ... [2021-11-02 22:34:58,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:34:58,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:58,114 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:34:58,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:34:58,153 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:34:58,153 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:34:58,153 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 22:34:58,153 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:34:58,154 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:34:58,154 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-02 22:34:58,154 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-02 22:34:58,154 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-02 22:34:58,154 INFO L138 BoogieDeclarations]: Found implementation of procedure is_empty [2021-11-02 22:34:58,155 INFO L138 BoogieDeclarations]: Found implementation of procedure create_item [2021-11-02 22:34:58,155 INFO L138 BoogieDeclarations]: Found implementation of procedure append_one [2021-11-02 22:34:58,155 INFO L138 BoogieDeclarations]: Found implementation of procedure remove_one [2021-11-02 22:34:58,155 INFO L138 BoogieDeclarations]: Found implementation of procedure rand_end_point [2021-11-02 22:34:58,155 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:34:58,156 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-11-02 22:34:58,156 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:34:58,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 22:34:58,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 22:34:58,156 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 22:34:58,157 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 22:34:58,157 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:34:58,157 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:34:58,157 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:34:58,157 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:34:58,158 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:34:58,158 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:34:58,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:34:58,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:34:58,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:34:58,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:34:58,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:34:58,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:34:58,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:34:58,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:34:58,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:34:58,160 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:34:58,160 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:34:58,160 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:34:58,160 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:34:58,161 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-02 22:34:58,161 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-02 22:34:58,161 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-02 22:34:58,161 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:34:58,161 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:34:58,162 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:34:58,162 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:34:58,162 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:34:58,162 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:34:58,162 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:34:58,163 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:34:58,163 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:34:58,163 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:34:58,163 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:34:58,163 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:34:58,164 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:34:58,164 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:34:58,164 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:34:58,164 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:34:58,164 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:34:58,165 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:34:58,165 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:34:58,165 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:34:58,165 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:34:58,165 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:34:58,166 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:34:58,166 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:34:58,166 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:34:58,166 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:34:58,166 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:34:58,167 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:34:58,167 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:34:58,167 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:34:58,167 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:34:58,168 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:34:58,168 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:34:58,168 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:34:58,168 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:34:58,168 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:34:58,169 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:34:58,169 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:34:58,169 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:34:58,169 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:34:58,169 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:34:58,170 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:34:58,170 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:34:58,170 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:34:58,170 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:34:58,170 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:34:58,171 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:34:58,171 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:34:58,171 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:34:58,171 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:34:58,171 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:34:58,172 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:34:58,172 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:34:58,172 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:34:58,172 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:34:58,172 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:34:58,173 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:34:58,173 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:34:58,173 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:34:58,173 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:34:58,173 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:34:58,174 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:34:58,174 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:34:58,174 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:34:58,174 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:34:58,174 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:34:58,175 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:34:58,175 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:34:58,175 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:34:58,175 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:34:58,175 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:34:58,176 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:34:58,176 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:34:58,176 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:34:58,176 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:34:58,176 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:34:58,177 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:34:58,177 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:34:58,177 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:34:58,177 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:34:58,177 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:34:58,178 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:34:58,178 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:34:58,178 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:34:58,178 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:34:58,178 INFO L130 BoogieDeclarations]: Found specification of procedure memcpy [2021-11-02 22:34:58,179 INFO L130 BoogieDeclarations]: Found specification of procedure memmove [2021-11-02 22:34:58,179 INFO L130 BoogieDeclarations]: Found specification of procedure memccpy [2021-11-02 22:34:58,179 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2021-11-02 22:34:58,179 INFO L130 BoogieDeclarations]: Found specification of procedure memcmp [2021-11-02 22:34:58,180 INFO L130 BoogieDeclarations]: Found specification of procedure memchr [2021-11-02 22:34:58,180 INFO L130 BoogieDeclarations]: Found specification of procedure strcpy [2021-11-02 22:34:58,180 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy [2021-11-02 22:34:58,180 INFO L130 BoogieDeclarations]: Found specification of procedure strcat [2021-11-02 22:34:58,180 INFO L130 BoogieDeclarations]: Found specification of procedure strncat [2021-11-02 22:34:58,181 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2021-11-02 22:34:58,181 INFO L130 BoogieDeclarations]: Found specification of procedure strncmp [2021-11-02 22:34:58,181 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll [2021-11-02 22:34:58,181 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm [2021-11-02 22:34:58,181 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll_l [2021-11-02 22:34:58,182 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm_l [2021-11-02 22:34:58,182 INFO L130 BoogieDeclarations]: Found specification of procedure strdup [2021-11-02 22:34:58,182 INFO L130 BoogieDeclarations]: Found specification of procedure strndup [2021-11-02 22:34:58,182 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2021-11-02 22:34:58,182 INFO L130 BoogieDeclarations]: Found specification of procedure strrchr [2021-11-02 22:34:58,183 INFO L130 BoogieDeclarations]: Found specification of procedure strcspn [2021-11-02 22:34:58,183 INFO L130 BoogieDeclarations]: Found specification of procedure strspn [2021-11-02 22:34:58,192 INFO L130 BoogieDeclarations]: Found specification of procedure strpbrk [2021-11-02 22:34:58,192 INFO L130 BoogieDeclarations]: Found specification of procedure strstr [2021-11-02 22:34:58,192 INFO L130 BoogieDeclarations]: Found specification of procedure strtok [2021-11-02 22:34:58,192 INFO L130 BoogieDeclarations]: Found specification of procedure __strtok_r [2021-11-02 22:34:58,193 INFO L130 BoogieDeclarations]: Found specification of procedure strtok_r [2021-11-02 22:34:58,193 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2021-11-02 22:34:58,193 INFO L130 BoogieDeclarations]: Found specification of procedure strnlen [2021-11-02 22:34:58,193 INFO L130 BoogieDeclarations]: Found specification of procedure strerror [2021-11-02 22:34:58,194 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_r [2021-11-02 22:34:58,194 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_l [2021-11-02 22:34:58,194 INFO L130 BoogieDeclarations]: Found specification of procedure bcmp [2021-11-02 22:34:58,194 INFO L130 BoogieDeclarations]: Found specification of procedure bcopy [2021-11-02 22:34:58,194 INFO L130 BoogieDeclarations]: Found specification of procedure bzero [2021-11-02 22:34:58,195 INFO L130 BoogieDeclarations]: Found specification of procedure index [2021-11-02 22:34:58,195 INFO L130 BoogieDeclarations]: Found specification of procedure rindex [2021-11-02 22:34:58,195 INFO L130 BoogieDeclarations]: Found specification of procedure ffs [2021-11-02 22:34:58,195 INFO L130 BoogieDeclarations]: Found specification of procedure ffsl [2021-11-02 22:34:58,196 INFO L130 BoogieDeclarations]: Found specification of procedure ffsll [2021-11-02 22:34:58,196 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp [2021-11-02 22:34:58,196 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp [2021-11-02 22:34:58,196 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp_l [2021-11-02 22:34:58,196 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp_l [2021-11-02 22:34:58,197 INFO L130 BoogieDeclarations]: Found specification of procedure explicit_bzero [2021-11-02 22:34:58,197 INFO L130 BoogieDeclarations]: Found specification of procedure strsep [2021-11-02 22:34:58,197 INFO L130 BoogieDeclarations]: Found specification of procedure strsignal [2021-11-02 22:34:58,197 INFO L130 BoogieDeclarations]: Found specification of procedure __stpcpy [2021-11-02 22:34:58,198 INFO L130 BoogieDeclarations]: Found specification of procedure stpcpy [2021-11-02 22:34:58,198 INFO L130 BoogieDeclarations]: Found specification of procedure __stpncpy [2021-11-02 22:34:58,198 INFO L130 BoogieDeclarations]: Found specification of procedure stpncpy [2021-11-02 22:34:58,198 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:34:58,198 INFO L130 BoogieDeclarations]: Found specification of procedure is_empty [2021-11-02 22:34:58,199 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:34:58,199 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:34:58,199 INFO L130 BoogieDeclarations]: Found specification of procedure create_item [2021-11-02 22:34:58,199 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:34:58,199 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:34:58,200 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:34:58,200 INFO L130 BoogieDeclarations]: Found specification of procedure append_one [2021-11-02 22:34:58,200 INFO L130 BoogieDeclarations]: Found specification of procedure remove_one [2021-11-02 22:34:58,200 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-11-02 22:34:58,201 INFO L130 BoogieDeclarations]: Found specification of procedure rand_end_point [2021-11-02 22:34:58,201 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:34:58,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:34:58,201 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:34:58,201 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 22:34:58,202 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:34:58,202 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:34:58,934 WARN L805 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-02 22:34:59,173 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:34:59,173 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-02 22:34:59,176 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:34:59 BoogieIcfgContainer [2021-11-02 22:34:59,176 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:34:59,178 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:34:59,179 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:34:59,182 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:34:59,183 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:34:57" (1/3) ... [2021-11-02 22:34:59,183 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7778817c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:34:59, skipping insertion in model container [2021-11-02 22:34:59,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:34:57" (2/3) ... [2021-11-02 22:34:59,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7778817c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:34:59, skipping insertion in model container [2021-11-02 22:34:59,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:34:59" (3/3) ... [2021-11-02 22:34:59,186 INFO L111 eAbstractionObserver]: Analyzing ICFG test-0217_1.i [2021-11-02 22:34:59,191 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:34:59,191 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 67 error locations. [2021-11-02 22:34:59,237 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:34:59,243 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 22:34:59,244 INFO L340 AbstractCegarLoop]: Starting to check reachability of 67 error locations. [2021-11-02 22:34:59,264 INFO L276 IsEmpty]: Start isEmpty. Operand has 198 states, 114 states have (on average 1.8508771929824561) internal successors, (211), 180 states have internal predecessors, (211), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-02 22:34:59,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-02 22:34:59,271 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:59,272 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:59,272 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:34:59,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:59,288 INFO L85 PathProgramCache]: Analyzing trace with hash 1787393731, now seen corresponding path program 1 times [2021-11-02 22:34:59,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:59,297 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520051111] [2021-11-02 22:34:59,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:59,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:59,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:59,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:59,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:59,560 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:59,561 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:59,561 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520051111] [2021-11-02 22:34:59,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520051111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:34:59,567 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:34:59,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:34:59,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448277374] [2021-11-02 22:34:59,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:34:59,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:59,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:34:59,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:34:59,601 INFO L87 Difference]: Start difference. First operand has 198 states, 114 states have (on average 1.8508771929824561) internal successors, (211), 180 states have internal predecessors, (211), 9 states have call successors, (9), 8 states have call predecessors, (9), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:00,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:00,210 INFO L93 Difference]: Finished difference Result 283 states and 325 transitions. [2021-11-02 22:35:00,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:35:00,212 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-02 22:35:00,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:00,242 INFO L225 Difference]: With dead ends: 283 [2021-11-02 22:35:00,243 INFO L226 Difference]: Without dead ends: 277 [2021-11-02 22:35:00,246 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:35:00,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-11-02 22:35:00,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 222. [2021-11-02 22:35:00,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 136 states have (on average 1.7352941176470589) internal successors, (236), 202 states have internal predecessors, (236), 11 states have call successors, (11), 8 states have call predecessors, (11), 9 states have return successors, (13), 11 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-02 22:35:00,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 260 transitions. [2021-11-02 22:35:00,345 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 260 transitions. Word has length 10 [2021-11-02 22:35:00,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:00,347 INFO L470 AbstractCegarLoop]: Abstraction has 222 states and 260 transitions. [2021-11-02 22:35:00,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:00,349 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 260 transitions. [2021-11-02 22:35:00,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:35:00,354 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:00,354 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:00,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:35:00,355 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:00,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:00,358 INFO L85 PathProgramCache]: Analyzing trace with hash 2071606334, now seen corresponding path program 1 times [2021-11-02 22:35:00,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:00,359 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59717924] [2021-11-02 22:35:00,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:00,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:00,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:00,517 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:00,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:00,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:00,543 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:00,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59717924] [2021-11-02 22:35:00,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59717924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:00,544 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:00,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-02 22:35:00,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212092409] [2021-11-02 22:35:00,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:35:00,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:00,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:35:00,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:35:00,547 INFO L87 Difference]: Start difference. First operand 222 states and 260 transitions. Second operand has 4 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:01,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:01,338 INFO L93 Difference]: Finished difference Result 454 states and 520 transitions. [2021-11-02 22:35:01,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:35:01,340 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:35:01,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:01,344 INFO L225 Difference]: With dead ends: 454 [2021-11-02 22:35:01,344 INFO L226 Difference]: Without dead ends: 454 [2021-11-02 22:35:01,345 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:01,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-11-02 22:35:01,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 305. [2021-11-02 22:35:01,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 208 states have (on average 1.7355769230769231) internal successors, (361), 274 states have internal predecessors, (361), 17 states have call successors, (17), 13 states have call predecessors, (17), 14 states have return successors, (21), 17 states have call predecessors, (21), 16 states have call successors, (21) [2021-11-02 22:35:01,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 399 transitions. [2021-11-02 22:35:01,369 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 399 transitions. Word has length 12 [2021-11-02 22:35:01,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:01,370 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 399 transitions. [2021-11-02 22:35:01,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:01,370 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 399 transitions. [2021-11-02 22:35:01,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:35:01,371 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:01,371 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:01,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:35:01,372 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:01,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:01,372 INFO L85 PathProgramCache]: Analyzing trace with hash 2071606335, now seen corresponding path program 1 times [2021-11-02 22:35:01,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:01,373 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967651496] [2021-11-02 22:35:01,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:01,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:01,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:01,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:01,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:01,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:01,527 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:01,527 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967651496] [2021-11-02 22:35:01,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967651496] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:01,528 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:01,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:35:01,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335629461] [2021-11-02 22:35:01,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:35:01,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:01,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:35:01,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:01,530 INFO L87 Difference]: Start difference. First operand 305 states and 399 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:02,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:02,467 INFO L93 Difference]: Finished difference Result 575 states and 700 transitions. [2021-11-02 22:35:02,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:35:02,467 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:35:02,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:02,471 INFO L225 Difference]: With dead ends: 575 [2021-11-02 22:35:02,471 INFO L226 Difference]: Without dead ends: 575 [2021-11-02 22:35:02,471 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:02,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-02 22:35:02,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 399. [2021-11-02 22:35:02,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 287 states have (on average 1.7073170731707317) internal successors, (490), 355 states have internal predecessors, (490), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:02,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 545 transitions. [2021-11-02 22:35:02,522 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 545 transitions. Word has length 12 [2021-11-02 22:35:02,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:02,522 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 545 transitions. [2021-11-02 22:35:02,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:02,523 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 545 transitions. [2021-11-02 22:35:02,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:35:02,523 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:02,523 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:02,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:35:02,524 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:02,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:02,525 INFO L85 PathProgramCache]: Analyzing trace with hash 2071606397, now seen corresponding path program 1 times [2021-11-02 22:35:02,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:02,525 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748531538] [2021-11-02 22:35:02,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:02,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:02,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:02,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:02,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:02,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:02,655 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:02,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748531538] [2021-11-02 22:35:02,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748531538] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:02,656 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:02,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:35:02,656 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992043639] [2021-11-02 22:35:02,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:35:02,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:02,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:35:02,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:02,658 INFO L87 Difference]: Start difference. First operand 399 states and 545 transitions. Second operand has 5 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:03,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:03,587 INFO L93 Difference]: Finished difference Result 573 states and 698 transitions. [2021-11-02 22:35:03,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:35:03,588 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:35:03,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:03,593 INFO L225 Difference]: With dead ends: 573 [2021-11-02 22:35:03,595 INFO L226 Difference]: Without dead ends: 573 [2021-11-02 22:35:03,596 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:03,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-11-02 22:35:03,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 398. [2021-11-02 22:35:03,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 286 states have (on average 1.7062937062937062) internal successors, (488), 354 states have internal predecessors, (488), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:03,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 543 transitions. [2021-11-02 22:35:03,617 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 543 transitions. Word has length 12 [2021-11-02 22:35:03,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:03,617 INFO L470 AbstractCegarLoop]: Abstraction has 398 states and 543 transitions. [2021-11-02 22:35:03,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:03,618 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 543 transitions. [2021-11-02 22:35:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:35:03,619 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:03,619 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:03,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:35:03,619 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:03,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:03,620 INFO L85 PathProgramCache]: Analyzing trace with hash 839415880, now seen corresponding path program 1 times [2021-11-02 22:35:03,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:03,620 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945926761] [2021-11-02 22:35:03,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:03,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:03,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:03,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:03,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:03,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:03,685 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:03,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945926761] [2021-11-02 22:35:03,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945926761] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:03,686 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:03,686 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:35:03,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834109124] [2021-11-02 22:35:03,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:35:03,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:03,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:35:03,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:35:03,690 INFO L87 Difference]: Start difference. First operand 398 states and 543 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:04,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:04,215 INFO L93 Difference]: Finished difference Result 470 states and 638 transitions. [2021-11-02 22:35:04,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:35:04,229 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-02 22:35:04,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:04,232 INFO L225 Difference]: With dead ends: 470 [2021-11-02 22:35:04,232 INFO L226 Difference]: Without dead ends: 465 [2021-11-02 22:35:04,233 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:04,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-02 22:35:04,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 395. [2021-11-02 22:35:04,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 283 states have (on average 1.6996466431095407) internal successors, (481), 351 states have internal predecessors, (481), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:04,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 536 transitions. [2021-11-02 22:35:04,253 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 536 transitions. Word has length 15 [2021-11-02 22:35:04,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:04,253 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 536 transitions. [2021-11-02 22:35:04,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:04,253 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 536 transitions. [2021-11-02 22:35:04,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:35:04,254 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:04,255 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:04,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:35:04,255 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting is_emptyErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:04,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:04,256 INFO L85 PathProgramCache]: Analyzing trace with hash 366993852, now seen corresponding path program 1 times [2021-11-02 22:35:04,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:04,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302915622] [2021-11-02 22:35:04,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:04,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:04,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:04,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:04,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:04,316 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:04,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:04,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:04,321 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:04,321 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302915622] [2021-11-02 22:35:04,321 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302915622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:04,322 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:04,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:35:04,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255505209] [2021-11-02 22:35:04,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:35:04,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:04,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:35:04,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:35:04,324 INFO L87 Difference]: Start difference. First operand 395 states and 536 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:04,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:04,807 INFO L93 Difference]: Finished difference Result 461 states and 629 transitions. [2021-11-02 22:35:04,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:35:04,809 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-11-02 22:35:04,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:04,813 INFO L225 Difference]: With dead ends: 461 [2021-11-02 22:35:04,813 INFO L226 Difference]: Without dead ends: 461 [2021-11-02 22:35:04,813 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:04,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-11-02 22:35:04,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 399. [2021-11-02 22:35:04,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 287 states have (on average 1.6898954703832754) internal successors, (485), 355 states have internal predecessors, (485), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:04,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 540 transitions. [2021-11-02 22:35:04,837 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 540 transitions. Word has length 25 [2021-11-02 22:35:04,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:04,837 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 540 transitions. [2021-11-02 22:35:04,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:04,838 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 540 transitions. [2021-11-02 22:35:04,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:35:04,839 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:04,839 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:04,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:35:04,840 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting is_emptyErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:04,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:04,841 INFO L85 PathProgramCache]: Analyzing trace with hash 108828414, now seen corresponding path program 1 times [2021-11-02 22:35:04,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:04,842 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696072246] [2021-11-02 22:35:04,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:04,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:04,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:04,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:04,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:04,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:04,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:05,002 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:05,002 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:05,002 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696072246] [2021-11-02 22:35:05,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696072246] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:05,003 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:05,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:35:05,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060355992] [2021-11-02 22:35:05,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:05,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:05,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:05,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:05,006 INFO L87 Difference]: Start difference. First operand 399 states and 540 transitions. Second operand has 8 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:06,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:06,100 INFO L93 Difference]: Finished difference Result 561 states and 705 transitions. [2021-11-02 22:35:06,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:06,101 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-11-02 22:35:06,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:06,105 INFO L225 Difference]: With dead ends: 561 [2021-11-02 22:35:06,105 INFO L226 Difference]: Without dead ends: 561 [2021-11-02 22:35:06,106 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:35:06,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-11-02 22:35:06,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 395. [2021-11-02 22:35:06,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 289 states have (on average 1.6366782006920415) internal successors, (473), 351 states have internal predecessors, (473), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:06,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 528 transitions. [2021-11-02 22:35:06,125 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 528 transitions. Word has length 25 [2021-11-02 22:35:06,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:06,125 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 528 transitions. [2021-11-02 22:35:06,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:06,126 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 528 transitions. [2021-11-02 22:35:06,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:35:06,127 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:06,127 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:06,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:35:06,128 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting is_emptyErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:06,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:06,128 INFO L85 PathProgramCache]: Analyzing trace with hash 108828415, now seen corresponding path program 1 times [2021-11-02 22:35:06,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:06,129 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11781711] [2021-11-02 22:35:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:06,129 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:06,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:06,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:06,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:06,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:06,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:06,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:06,313 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:06,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11781711] [2021-11-02 22:35:06,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11781711] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:06,314 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:06,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:35:06,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094301326] [2021-11-02 22:35:06,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:06,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:06,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:06,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:06,316 INFO L87 Difference]: Start difference. First operand 395 states and 528 transitions. Second operand has 8 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:07,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:07,571 INFO L93 Difference]: Finished difference Result 494 states and 609 transitions. [2021-11-02 22:35:07,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:35:07,573 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2021-11-02 22:35:07,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:07,578 INFO L225 Difference]: With dead ends: 494 [2021-11-02 22:35:07,578 INFO L226 Difference]: Without dead ends: 494 [2021-11-02 22:35:07,578 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:35:07,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2021-11-02 22:35:07,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 395. [2021-11-02 22:35:07,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 289 states have (on average 1.602076124567474) internal successors, (463), 351 states have internal predecessors, (463), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:07,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 518 transitions. [2021-11-02 22:35:07,597 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 518 transitions. Word has length 25 [2021-11-02 22:35:07,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:07,599 INFO L470 AbstractCegarLoop]: Abstraction has 395 states and 518 transitions. [2021-11-02 22:35:07,600 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:07,600 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 518 transitions. [2021-11-02 22:35:07,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:35:07,607 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:07,607 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:07,608 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:35:07,608 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting create_itemErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:07,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:07,608 INFO L85 PathProgramCache]: Analyzing trace with hash -57631190, now seen corresponding path program 1 times [2021-11-02 22:35:07,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:07,610 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043639353] [2021-11-02 22:35:07,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:07,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:07,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:07,744 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:07,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:07,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:07,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:07,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:07,764 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:07,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043639353] [2021-11-02 22:35:07,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043639353] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:07,765 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:07,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:35:07,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740171610] [2021-11-02 22:35:07,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:07,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:07,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:07,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:07,767 INFO L87 Difference]: Start difference. First operand 395 states and 518 transitions. Second operand has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:08,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:08,729 INFO L93 Difference]: Finished difference Result 555 states and 683 transitions. [2021-11-02 22:35:08,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:08,730 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-11-02 22:35:08,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:08,734 INFO L225 Difference]: With dead ends: 555 [2021-11-02 22:35:08,734 INFO L226 Difference]: Without dead ends: 555 [2021-11-02 22:35:08,735 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:35:08,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-11-02 22:35:08,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 392. [2021-11-02 22:35:08,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 290 states have (on average 1.5758620689655172) internal successors, (457), 348 states have internal predecessors, (457), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:08,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 512 transitions. [2021-11-02 22:35:08,753 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 512 transitions. Word has length 26 [2021-11-02 22:35:08,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:08,753 INFO L470 AbstractCegarLoop]: Abstraction has 392 states and 512 transitions. [2021-11-02 22:35:08,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:08,754 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 512 transitions. [2021-11-02 22:35:08,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:35:08,755 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:08,755 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:08,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-02 22:35:08,755 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:08,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:08,756 INFO L85 PathProgramCache]: Analyzing trace with hash -57631189, now seen corresponding path program 1 times [2021-11-02 22:35:08,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:08,756 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322018232] [2021-11-02 22:35:08,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:08,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:08,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:08,982 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:08,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:09,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:09,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:09,049 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:09,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322018232] [2021-11-02 22:35:09,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322018232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:09,050 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:09,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:35:09,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891917523] [2021-11-02 22:35:09,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:09,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:09,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:09,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:09,052 INFO L87 Difference]: Start difference. First operand 392 states and 512 transitions. Second operand has 10 states, 8 states have (on average 2.375) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:10,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:10,517 INFO L93 Difference]: Finished difference Result 591 states and 723 transitions. [2021-11-02 22:35:10,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:35:10,519 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.375) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2021-11-02 22:35:10,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:10,523 INFO L225 Difference]: With dead ends: 591 [2021-11-02 22:35:10,523 INFO L226 Difference]: Without dead ends: 591 [2021-11-02 22:35:10,523 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:35:10,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2021-11-02 22:35:10,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 412. [2021-11-02 22:35:10,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 310 states have (on average 1.5870967741935484) internal successors, (492), 368 states have internal predecessors, (492), 24 states have call successors, (24), 20 states have call predecessors, (24), 23 states have return successors, (31), 23 states have call predecessors, (31), 23 states have call successors, (31) [2021-11-02 22:35:10,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 547 transitions. [2021-11-02 22:35:10,541 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 547 transitions. Word has length 26 [2021-11-02 22:35:10,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:10,542 INFO L470 AbstractCegarLoop]: Abstraction has 412 states and 547 transitions. [2021-11-02 22:35:10,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.375) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:10,542 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 547 transitions. [2021-11-02 22:35:10,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:35:10,545 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:10,545 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:10,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:35:10,546 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting create_itemErr4REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:10,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:10,546 INFO L85 PathProgramCache]: Analyzing trace with hash -371665808, now seen corresponding path program 1 times [2021-11-02 22:35:10,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:10,547 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556163026] [2021-11-02 22:35:10,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:10,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:10,897 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:10,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:10,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:10,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:10,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:10,940 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:10,940 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556163026] [2021-11-02 22:35:10,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556163026] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:10,940 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:10,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:35:10,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774205392] [2021-11-02 22:35:10,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:35:10,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:10,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:35:10,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:10,943 INFO L87 Difference]: Start difference. First operand 412 states and 547 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:12,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:12,551 INFO L93 Difference]: Finished difference Result 625 states and 809 transitions. [2021-11-02 22:35:12,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:35:12,551 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-11-02 22:35:12,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:12,558 INFO L225 Difference]: With dead ends: 625 [2021-11-02 22:35:12,559 INFO L226 Difference]: Without dead ends: 625 [2021-11-02 22:35:12,560 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:35:12,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-11-02 22:35:12,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 499. [2021-11-02 22:35:12,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 383 states have (on average 1.5352480417754568) internal successors, (588), 440 states have internal predecessors, (588), 33 states have call successors, (33), 28 states have call predecessors, (33), 29 states have return successors, (45), 30 states have call predecessors, (45), 32 states have call successors, (45) [2021-11-02 22:35:12,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 666 transitions. [2021-11-02 22:35:12,589 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 666 transitions. Word has length 30 [2021-11-02 22:35:12,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:12,590 INFO L470 AbstractCegarLoop]: Abstraction has 499 states and 666 transitions. [2021-11-02 22:35:12,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:12,591 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 666 transitions. [2021-11-02 22:35:12,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-02 22:35:12,592 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:12,593 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:12,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 22:35:12,593 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting is_emptyErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:12,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:12,594 INFO L85 PathProgramCache]: Analyzing trace with hash 848596162, now seen corresponding path program 1 times [2021-11-02 22:35:12,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:12,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731256890] [2021-11-02 22:35:12,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:12,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:12,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:13,032 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:13,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:13,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:13,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:13,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:13,065 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:13,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731256890] [2021-11-02 22:35:13,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731256890] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:13,066 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:13,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-02 22:35:13,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437490688] [2021-11-02 22:35:13,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:35:13,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:13,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:35:13,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:35:13,068 INFO L87 Difference]: Start difference. First operand 499 states and 666 transitions. Second operand has 13 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:15,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:15,287 INFO L93 Difference]: Finished difference Result 590 states and 768 transitions. [2021-11-02 22:35:15,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:35:15,288 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2021-11-02 22:35:15,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:15,292 INFO L225 Difference]: With dead ends: 590 [2021-11-02 22:35:15,292 INFO L226 Difference]: Without dead ends: 589 [2021-11-02 22:35:15,293 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=145, Invalid=505, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:35:15,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-11-02 22:35:15,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 491. [2021-11-02 22:35:15,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 376 states have (on average 1.5345744680851063) internal successors, (577), 433 states have internal predecessors, (577), 33 states have call successors, (33), 28 states have call predecessors, (33), 28 states have return successors, (43), 29 states have call predecessors, (43), 32 states have call successors, (43) [2021-11-02 22:35:15,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 653 transitions. [2021-11-02 22:35:15,311 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 653 transitions. Word has length 31 [2021-11-02 22:35:15,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:15,311 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 653 transitions. [2021-11-02 22:35:15,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:15,312 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 653 transitions. [2021-11-02 22:35:15,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:35:15,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:15,313 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:15,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-02 22:35:15,313 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting create_itemErr10REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:15,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:15,314 INFO L85 PathProgramCache]: Analyzing trace with hash -679853465, now seen corresponding path program 1 times [2021-11-02 22:35:15,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:15,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700982220] [2021-11-02 22:35:15,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:15,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:15,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:15,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:15,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:15,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:15,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:15,391 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:15,392 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:15,392 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700982220] [2021-11-02 22:35:15,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700982220] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:15,392 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:15,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:35:15,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141731525] [2021-11-02 22:35:15,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:35:15,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:15,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:35:15,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:35:15,394 INFO L87 Difference]: Start difference. First operand 491 states and 653 transitions. Second operand has 4 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:15,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:15,806 INFO L93 Difference]: Finished difference Result 544 states and 719 transitions. [2021-11-02 22:35:15,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:35:15,806 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2021-11-02 22:35:15,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:15,810 INFO L225 Difference]: With dead ends: 544 [2021-11-02 22:35:15,810 INFO L226 Difference]: Without dead ends: 544 [2021-11-02 22:35:15,811 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:35:15,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2021-11-02 22:35:15,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 488. [2021-11-02 22:35:15,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 376 states have (on average 1.5106382978723405) internal successors, (568), 430 states have internal predecessors, (568), 33 states have call successors, (33), 28 states have call predecessors, (33), 28 states have return successors, (43), 29 states have call predecessors, (43), 32 states have call successors, (43) [2021-11-02 22:35:15,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 644 transitions. [2021-11-02 22:35:15,829 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 644 transitions. Word has length 32 [2021-11-02 22:35:15,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:15,829 INFO L470 AbstractCegarLoop]: Abstraction has 488 states and 644 transitions. [2021-11-02 22:35:15,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:15,830 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 644 transitions. [2021-11-02 22:35:15,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:35:15,831 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:15,831 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:15,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 22:35:15,831 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting create_itemErr11REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:15,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:15,832 INFO L85 PathProgramCache]: Analyzing trace with hash -679853464, now seen corresponding path program 1 times [2021-11-02 22:35:15,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:15,832 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034405982] [2021-11-02 22:35:15,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:15,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:15,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:15,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:15,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:15,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:15,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:15,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:15,924 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:15,924 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034405982] [2021-11-02 22:35:15,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034405982] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:15,925 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:15,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:35:15,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631272996] [2021-11-02 22:35:15,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:35:15,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:15,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:35:15,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:15,927 INFO L87 Difference]: Start difference. First operand 488 states and 644 transitions. Second operand has 5 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:16,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:16,439 INFO L93 Difference]: Finished difference Result 641 states and 852 transitions. [2021-11-02 22:35:16,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:35:16,442 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2021-11-02 22:35:16,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:16,446 INFO L225 Difference]: With dead ends: 641 [2021-11-02 22:35:16,446 INFO L226 Difference]: Without dead ends: 641 [2021-11-02 22:35:16,447 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:16,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-11-02 22:35:16,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 536. [2021-11-02 22:35:16,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 425 states have (on average 1.5058823529411764) internal successors, (640), 478 states have internal predecessors, (640), 33 states have call successors, (33), 28 states have call predecessors, (33), 28 states have return successors, (43), 29 states have call predecessors, (43), 32 states have call successors, (43) [2021-11-02 22:35:16,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 716 transitions. [2021-11-02 22:35:16,466 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 716 transitions. Word has length 32 [2021-11-02 22:35:16,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:16,467 INFO L470 AbstractCegarLoop]: Abstraction has 536 states and 716 transitions. [2021-11-02 22:35:16,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:16,467 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 716 transitions. [2021-11-02 22:35:16,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:35:16,468 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:16,468 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:16,468 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:35:16,469 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting create_itemErr11REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:16,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:16,469 INFO L85 PathProgramCache]: Analyzing trace with hash -193148690, now seen corresponding path program 1 times [2021-11-02 22:35:16,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:16,470 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953767886] [2021-11-02 22:35:16,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:16,470 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:16,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:16,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:16,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:16,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:16,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:16,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:16,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:16,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953767886] [2021-11-02 22:35:16,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953767886] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:16,636 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:16,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:35:16,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155907762] [2021-11-02 22:35:16,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:16,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:16,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:16,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:16,638 INFO L87 Difference]: Start difference. First operand 536 states and 716 transitions. Second operand has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 7 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:17,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:17,404 INFO L93 Difference]: Finished difference Result 592 states and 787 transitions. [2021-11-02 22:35:17,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:17,406 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 7 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-11-02 22:35:17,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:17,411 INFO L225 Difference]: With dead ends: 592 [2021-11-02 22:35:17,411 INFO L226 Difference]: Without dead ends: 592 [2021-11-02 22:35:17,411 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:35:17,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-11-02 22:35:17,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 536. [2021-11-02 22:35:17,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 536 states, 425 states have (on average 1.4964705882352942) internal successors, (636), 478 states have internal predecessors, (636), 33 states have call successors, (33), 28 states have call predecessors, (33), 28 states have return successors, (43), 29 states have call predecessors, (43), 32 states have call successors, (43) [2021-11-02 22:35:17,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 536 states to 536 states and 712 transitions. [2021-11-02 22:35:17,443 INFO L78 Accepts]: Start accepts. Automaton has 536 states and 712 transitions. Word has length 33 [2021-11-02 22:35:17,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:17,443 INFO L470 AbstractCegarLoop]: Abstraction has 536 states and 712 transitions. [2021-11-02 22:35:17,444 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 7 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:17,444 INFO L276 IsEmpty]: Start isEmpty. Operand 536 states and 712 transitions. [2021-11-02 22:35:17,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:35:17,444 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:17,444 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:17,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:35:17,445 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting create_itemErr11REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:17,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:17,445 INFO L85 PathProgramCache]: Analyzing trace with hash 486909680, now seen corresponding path program 1 times [2021-11-02 22:35:17,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:17,446 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169363497] [2021-11-02 22:35:17,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:17,446 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:17,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:17,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:17,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:17,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:17,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:17,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:17,642 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:17,643 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169363497] [2021-11-02 22:35:17,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169363497] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:17,646 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:17,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:35:17,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349690583] [2021-11-02 22:35:17,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:17,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:17,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:17,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:17,648 INFO L87 Difference]: Start difference. First operand 536 states and 712 transitions. Second operand has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 7 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:18,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:18,387 INFO L93 Difference]: Finished difference Result 538 states and 701 transitions. [2021-11-02 22:35:18,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:18,388 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 7 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-11-02 22:35:18,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:18,391 INFO L225 Difference]: With dead ends: 538 [2021-11-02 22:35:18,392 INFO L226 Difference]: Without dead ends: 538 [2021-11-02 22:35:18,392 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:35:18,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-11-02 22:35:18,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 482. [2021-11-02 22:35:18,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 372 states have (on average 1.478494623655914) internal successors, (550), 424 states have internal predecessors, (550), 33 states have call successors, (33), 28 states have call predecessors, (33), 28 states have return successors, (43), 29 states have call predecessors, (43), 32 states have call successors, (43) [2021-11-02 22:35:18,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 626 transitions. [2021-11-02 22:35:18,409 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 626 transitions. Word has length 33 [2021-11-02 22:35:18,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:18,410 INFO L470 AbstractCegarLoop]: Abstraction has 482 states and 626 transitions. [2021-11-02 22:35:18,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.888888888888889) internal successors, (26), 7 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:18,410 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 626 transitions. [2021-11-02 22:35:18,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:35:18,411 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:18,411 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:18,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:35:18,412 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting create_itemErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:18,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:18,412 INFO L85 PathProgramCache]: Analyzing trace with hash -504141432, now seen corresponding path program 1 times [2021-11-02 22:35:18,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:18,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556764728] [2021-11-02 22:35:18,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:18,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:18,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:18,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:18,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:18,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:18,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:18,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:18,537 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:18,538 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556764728] [2021-11-02 22:35:18,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556764728] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:18,538 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:18,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:18,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047812303] [2021-11-02 22:35:18,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:18,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:18,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:18,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:18,540 INFO L87 Difference]: Start difference. First operand 482 states and 626 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:19,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:19,207 INFO L93 Difference]: Finished difference Result 590 states and 763 transitions. [2021-11-02 22:35:19,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:35:19,208 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 34 [2021-11-02 22:35:19,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:19,212 INFO L225 Difference]: With dead ends: 590 [2021-11-02 22:35:19,212 INFO L226 Difference]: Without dead ends: 590 [2021-11-02 22:35:19,212 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:19,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-11-02 22:35:19,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 521. [2021-11-02 22:35:19,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 521 states, 409 states have (on average 1.4596577017114913) internal successors, (597), 463 states have internal predecessors, (597), 33 states have call successors, (33), 28 states have call predecessors, (33), 30 states have return successors, (45), 29 states have call predecessors, (45), 32 states have call successors, (45) [2021-11-02 22:35:19,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 521 states to 521 states and 675 transitions. [2021-11-02 22:35:19,233 INFO L78 Accepts]: Start accepts. Automaton has 521 states and 675 transitions. Word has length 34 [2021-11-02 22:35:19,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:19,235 INFO L470 AbstractCegarLoop]: Abstraction has 521 states and 675 transitions. [2021-11-02 22:35:19,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 7 states have internal predecessors, (27), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:19,235 INFO L276 IsEmpty]: Start isEmpty. Operand 521 states and 675 transitions. [2021-11-02 22:35:19,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:35:19,236 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:19,236 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:19,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-02 22:35:19,236 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting create_itemErr15REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:19,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:19,237 INFO L85 PathProgramCache]: Analyzing trace with hash -504141238, now seen corresponding path program 1 times [2021-11-02 22:35:19,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:19,238 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549122443] [2021-11-02 22:35:19,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:19,238 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:19,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:19,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,332 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:19,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:19,336 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:19,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549122443] [2021-11-02 22:35:19,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549122443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:19,336 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:19,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:35:19,337 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600475517] [2021-11-02 22:35:19,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:35:19,339 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:19,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:35:19,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:19,340 INFO L87 Difference]: Start difference. First operand 521 states and 675 transitions. Second operand has 5 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:19,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:19,685 INFO L93 Difference]: Finished difference Result 576 states and 744 transitions. [2021-11-02 22:35:19,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:35:19,685 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 34 [2021-11-02 22:35:19,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:19,689 INFO L225 Difference]: With dead ends: 576 [2021-11-02 22:35:19,689 INFO L226 Difference]: Without dead ends: 576 [2021-11-02 22:35:19,689 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:35:19,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-11-02 22:35:19,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 520. [2021-11-02 22:35:19,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 409 states have (on average 1.4449877750611246) internal successors, (591), 462 states have internal predecessors, (591), 33 states have call successors, (33), 28 states have call predecessors, (33), 30 states have return successors, (45), 29 states have call predecessors, (45), 32 states have call successors, (45) [2021-11-02 22:35:19,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 669 transitions. [2021-11-02 22:35:19,711 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 669 transitions. Word has length 34 [2021-11-02 22:35:19,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:19,711 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 669 transitions. [2021-11-02 22:35:19,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 1 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:19,712 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 669 transitions. [2021-11-02 22:35:19,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:35:19,713 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:19,713 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:19,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-02 22:35:19,713 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting remove_oneErr6ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:19,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:19,714 INFO L85 PathProgramCache]: Analyzing trace with hash -701635590, now seen corresponding path program 1 times [2021-11-02 22:35:19,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:19,714 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881788990] [2021-11-02 22:35:19,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:19,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:19,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:19,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:19,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,859 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:19,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,867 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:19,867 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:19,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881788990] [2021-11-02 22:35:19,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881788990] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:19,867 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:19,868 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:35:19,868 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959485724] [2021-11-02 22:35:19,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:19,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:19,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:19,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:19,871 INFO L87 Difference]: Start difference. First operand 520 states and 669 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 5 states have internal predecessors, (31), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:20,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:20,616 INFO L93 Difference]: Finished difference Result 615 states and 777 transitions. [2021-11-02 22:35:20,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:35:20,617 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), 3 states have call successors, (5), 5 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 39 [2021-11-02 22:35:20,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:20,621 INFO L225 Difference]: With dead ends: 615 [2021-11-02 22:35:20,621 INFO L226 Difference]: Without dead ends: 615 [2021-11-02 22:35:20,621 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:35:20,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-11-02 22:35:20,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 520. [2021-11-02 22:35:20,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 409 states have (on average 1.4425427872860637) internal successors, (590), 462 states have internal predecessors, (590), 33 states have call successors, (33), 28 states have call predecessors, (33), 30 states have return successors, (45), 29 states have call predecessors, (45), 32 states have call successors, (45) [2021-11-02 22:35:20,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 668 transitions. [2021-11-02 22:35:20,638 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 668 transitions. Word has length 39 [2021-11-02 22:35:20,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:20,638 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 668 transitions. [2021-11-02 22:35:20,638 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), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:20,639 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 668 transitions. [2021-11-02 22:35:20,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 22:35:20,639 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:20,639 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:20,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-02 22:35:20,640 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting remove_oneErr7ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:20,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:20,640 INFO L85 PathProgramCache]: Analyzing trace with hash -275866712, now seen corresponding path program 1 times [2021-11-02 22:35:20,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:20,641 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913080481] [2021-11-02 22:35:20,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:20,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:20,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:20,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:20,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:20,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:20,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:20,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:20,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:20,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:20,806 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:20,806 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913080481] [2021-11-02 22:35:20,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913080481] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:20,807 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:20,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:35:20,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456628154] [2021-11-02 22:35:20,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:20,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:20,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:20,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:20,809 INFO L87 Difference]: Start difference. First operand 520 states and 668 transitions. Second operand has 8 states, 7 states have (on average 4.571428571428571) internal successors, (32), 5 states have internal predecessors, (32), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:21,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:21,626 INFO L93 Difference]: Finished difference Result 728 states and 921 transitions. [2021-11-02 22:35:21,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:35:21,634 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.571428571428571) internal successors, (32), 5 states have internal predecessors, (32), 3 states have call successors, (5), 5 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 40 [2021-11-02 22:35:21,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:21,638 INFO L225 Difference]: With dead ends: 728 [2021-11-02 22:35:21,639 INFO L226 Difference]: Without dead ends: 728 [2021-11-02 22:35:21,639 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:35:21,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 728 states. [2021-11-02 22:35:21,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 728 to 574. [2021-11-02 22:35:21,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 454 states have (on average 1.4251101321585904) internal successors, (647), 508 states have internal predecessors, (647), 38 states have call successors, (38), 32 states have call predecessors, (38), 35 states have return successors, (54), 33 states have call predecessors, (54), 37 states have call successors, (54) [2021-11-02 22:35:21,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 739 transitions. [2021-11-02 22:35:21,657 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 739 transitions. Word has length 40 [2021-11-02 22:35:21,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:21,657 INFO L470 AbstractCegarLoop]: Abstraction has 574 states and 739 transitions. [2021-11-02 22:35:21,657 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.571428571428571) internal successors, (32), 5 states have internal predecessors, (32), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:21,658 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 739 transitions. [2021-11-02 22:35:21,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:35:21,658 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:21,659 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:21,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 22:35:21,659 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting remove_oneErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:21,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:21,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1597990417, now seen corresponding path program 1 times [2021-11-02 22:35:21,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:21,660 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419249692] [2021-11-02 22:35:21,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:21,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:21,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:21,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:21,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:21,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:21,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:21,751 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:21,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:21,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:21,757 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:21,757 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419249692] [2021-11-02 22:35:21,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419249692] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:21,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:21,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:21,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687760864] [2021-11-02 22:35:21,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:21,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:21,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:21,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:21,760 INFO L87 Difference]: Start difference. First operand 574 states and 739 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 5 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:22,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:22,136 INFO L93 Difference]: Finished difference Result 644 states and 828 transitions. [2021-11-02 22:35:22,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:35:22,148 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 5 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2021-11-02 22:35:22,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:22,152 INFO L225 Difference]: With dead ends: 644 [2021-11-02 22:35:22,152 INFO L226 Difference]: Without dead ends: 644 [2021-11-02 22:35:22,153 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:35:22,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-11-02 22:35:22,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 574. [2021-11-02 22:35:22,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 454 states have (on average 1.420704845814978) internal successors, (645), 508 states have internal predecessors, (645), 38 states have call successors, (38), 32 states have call predecessors, (38), 35 states have return successors, (54), 33 states have call predecessors, (54), 37 states have call successors, (54) [2021-11-02 22:35:22,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 737 transitions. [2021-11-02 22:35:22,176 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 737 transitions. Word has length 42 [2021-11-02 22:35:22,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:22,177 INFO L470 AbstractCegarLoop]: Abstraction has 574 states and 737 transitions. [2021-11-02 22:35:22,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 5 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:22,177 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 737 transitions. [2021-11-02 22:35:22,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:35:22,178 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:22,178 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:22,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-02 22:35:22,179 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting remove_oneErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:22,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:22,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1597992339, now seen corresponding path program 1 times [2021-11-02 22:35:22,179 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:22,179 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341035248] [2021-11-02 22:35:22,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:22,180 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:22,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:22,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:22,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:22,258 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:22,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:22,279 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:22,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:22,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:22,291 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:22,291 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341035248] [2021-11-02 22:35:22,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341035248] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:22,292 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:22,292 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:22,292 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150901282] [2021-11-02 22:35:22,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:22,293 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:22,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:22,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:22,294 INFO L87 Difference]: Start difference. First operand 574 states and 737 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 5 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:22,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:22,830 INFO L93 Difference]: Finished difference Result 644 states and 824 transitions. [2021-11-02 22:35:22,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:35:22,831 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 5 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2021-11-02 22:35:22,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:22,835 INFO L225 Difference]: With dead ends: 644 [2021-11-02 22:35:22,835 INFO L226 Difference]: Without dead ends: 644 [2021-11-02 22:35:22,836 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:35:22,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-11-02 22:35:22,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 574. [2021-11-02 22:35:22,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 454 states have (on average 1.4162995594713657) internal successors, (643), 508 states have internal predecessors, (643), 38 states have call successors, (38), 32 states have call predecessors, (38), 35 states have return successors, (54), 33 states have call predecessors, (54), 37 states have call successors, (54) [2021-11-02 22:35:22,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 735 transitions. [2021-11-02 22:35:22,853 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 735 transitions. Word has length 42 [2021-11-02 22:35:22,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:22,853 INFO L470 AbstractCegarLoop]: Abstraction has 574 states and 735 transitions. [2021-11-02 22:35:22,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 5 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:22,854 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 735 transitions. [2021-11-02 22:35:22,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:35:22,854 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:22,855 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:22,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-02 22:35:22,855 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting remove_oneErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:22,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:22,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1596145297, now seen corresponding path program 1 times [2021-11-02 22:35:22,856 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:22,856 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566194245] [2021-11-02 22:35:22,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:22,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:22,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:22,974 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:22,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:22,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:22,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:23,006 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:23,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:23,013 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:23,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:23,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566194245] [2021-11-02 22:35:23,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566194245] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:23,014 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:23,014 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:35:23,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529088131] [2021-11-02 22:35:23,015 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:23,015 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:23,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:23,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:23,016 INFO L87 Difference]: Start difference. First operand 574 states and 735 transitions. Second operand has 10 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 7 states have internal predecessors, (34), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:23,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:23,785 INFO L93 Difference]: Finished difference Result 644 states and 821 transitions. [2021-11-02 22:35:23,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:35:23,785 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 7 states have internal predecessors, (34), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-11-02 22:35:23,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:23,788 INFO L225 Difference]: With dead ends: 644 [2021-11-02 22:35:23,788 INFO L226 Difference]: Without dead ends: 644 [2021-11-02 22:35:23,789 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:35:23,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-11-02 22:35:23,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 567. [2021-11-02 22:35:23,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 450 states have (on average 1.4088888888888889) internal successors, (634), 502 states have internal predecessors, (634), 38 states have call successors, (38), 32 states have call predecessors, (38), 34 states have return successors, (53), 32 states have call predecessors, (53), 37 states have call successors, (53) [2021-11-02 22:35:23,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 725 transitions. [2021-11-02 22:35:23,805 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 725 transitions. Word has length 42 [2021-11-02 22:35:23,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:23,805 INFO L470 AbstractCegarLoop]: Abstraction has 567 states and 725 transitions. [2021-11-02 22:35:23,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 7 states have internal predecessors, (34), 4 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:23,806 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 725 transitions. [2021-11-02 22:35:23,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:35:23,806 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:23,807 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:23,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-02 22:35:23,807 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting remove_oneErr9REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:23,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:23,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1180065323, now seen corresponding path program 1 times [2021-11-02 22:35:23,807 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:23,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228861281] [2021-11-02 22:35:23,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:23,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:23,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:23,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:23,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:23,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:23,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:23,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:23,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:23,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:23,990 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:23,990 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228861281] [2021-11-02 22:35:23,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [228861281] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:23,990 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:23,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:35:23,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947355435] [2021-11-02 22:35:23,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:35:23,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:23,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:35:23,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:35:23,992 INFO L87 Difference]: Start difference. First operand 567 states and 725 transitions. Second operand has 13 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 10 states have internal predecessors, (34), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:24,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:24,965 INFO L93 Difference]: Finished difference Result 747 states and 906 transitions. [2021-11-02 22:35:24,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:35:24,966 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 10 states have internal predecessors, (34), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-11-02 22:35:24,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:24,969 INFO L225 Difference]: With dead ends: 747 [2021-11-02 22:35:24,970 INFO L226 Difference]: Without dead ends: 747 [2021-11-02 22:35:24,970 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:35:24,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 747 states. [2021-11-02 22:35:24,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 747 to 601. [2021-11-02 22:35:24,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 601 states, 479 states have (on average 1.4029227557411275) internal successors, (672), 531 states have internal predecessors, (672), 40 states have call successors, (40), 32 states have call predecessors, (40), 38 states have return successors, (58), 37 states have call predecessors, (58), 39 states have call successors, (58) [2021-11-02 22:35:24,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 601 states to 601 states and 770 transitions. [2021-11-02 22:35:24,988 INFO L78 Accepts]: Start accepts. Automaton has 601 states and 770 transitions. Word has length 42 [2021-11-02 22:35:24,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:24,988 INFO L470 AbstractCegarLoop]: Abstraction has 601 states and 770 transitions. [2021-11-02 22:35:24,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.8333333333333335) internal successors, (34), 10 states have internal predecessors, (34), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:24,989 INFO L276 IsEmpty]: Start isEmpty. Operand 601 states and 770 transitions. [2021-11-02 22:35:24,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:35:24,989 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:24,989 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:24,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-02 22:35:24,990 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting append_oneErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:24,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:24,990 INFO L85 PathProgramCache]: Analyzing trace with hash -127880869, now seen corresponding path program 1 times [2021-11-02 22:35:24,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:24,990 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675405691] [2021-11-02 22:35:24,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:24,991 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:25,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:25,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:25,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,055 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-02 22:35:25,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,092 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:25,092 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:25,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675405691] [2021-11-02 22:35:25,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675405691] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:25,093 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:25,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:25,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8931266] [2021-11-02 22:35:25,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:35:25,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:25,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:35:25,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:35:25,095 INFO L87 Difference]: Start difference. First operand 601 states and 770 transitions. Second operand has 9 states, 8 states have (on average 4.5) internal successors, (36), 6 states have internal predecessors, (36), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:35:25,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:25,747 INFO L93 Difference]: Finished difference Result 672 states and 857 transitions. [2021-11-02 22:35:25,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:35:25,748 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.5) internal successors, (36), 6 states have internal predecessors, (36), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-02 22:35:25,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:25,751 INFO L225 Difference]: With dead ends: 672 [2021-11-02 22:35:25,751 INFO L226 Difference]: Without dead ends: 672 [2021-11-02 22:35:25,751 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:25,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2021-11-02 22:35:25,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 603. [2021-11-02 22:35:25,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 481 states have (on average 1.3991683991683992) internal successors, (673), 533 states have internal predecessors, (673), 40 states have call successors, (40), 32 states have call predecessors, (40), 39 states have return successors, (59), 37 states have call predecessors, (59), 39 states have call successors, (59) [2021-11-02 22:35:25,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 772 transitions. [2021-11-02 22:35:25,766 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 772 transitions. Word has length 44 [2021-11-02 22:35:25,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:25,766 INFO L470 AbstractCegarLoop]: Abstraction has 603 states and 772 transitions. [2021-11-02 22:35:25,766 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.5) internal successors, (36), 6 states have internal predecessors, (36), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:35:25,767 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 772 transitions. [2021-11-02 22:35:25,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:35:25,767 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:25,767 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:25,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-02 22:35:25,768 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting append_oneErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:25,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:25,768 INFO L85 PathProgramCache]: Analyzing trace with hash -127880868, now seen corresponding path program 1 times [2021-11-02 22:35:25,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:25,768 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766174239] [2021-11-02 22:35:25,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:25,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:25,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:25,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,835 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:25,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-02 22:35:25,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:25,902 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:25,902 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:25,902 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766174239] [2021-11-02 22:35:25,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766174239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:25,903 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:25,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:25,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214394522] [2021-11-02 22:35:25,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:35:25,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:25,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:35:25,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:35:25,905 INFO L87 Difference]: Start difference. First operand 603 states and 772 transitions. Second operand has 9 states, 8 states have (on average 4.5) internal successors, (36), 6 states have internal predecessors, (36), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:35:26,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:26,580 INFO L93 Difference]: Finished difference Result 671 states and 855 transitions. [2021-11-02 22:35:26,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:35:26,580 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.5) internal successors, (36), 6 states have internal predecessors, (36), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-02 22:35:26,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:26,585 INFO L225 Difference]: With dead ends: 671 [2021-11-02 22:35:26,585 INFO L226 Difference]: Without dead ends: 671 [2021-11-02 22:35:26,585 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:26,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-11-02 22:35:26,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 602. [2021-11-02 22:35:26,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 481 states have (on average 1.395010395010395) internal successors, (671), 532 states have internal predecessors, (671), 40 states have call successors, (40), 32 states have call predecessors, (40), 39 states have return successors, (59), 37 states have call predecessors, (59), 39 states have call successors, (59) [2021-11-02 22:35:26,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 770 transitions. [2021-11-02 22:35:26,612 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 770 transitions. Word has length 44 [2021-11-02 22:35:26,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:26,613 INFO L470 AbstractCegarLoop]: Abstraction has 602 states and 770 transitions. [2021-11-02 22:35:26,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.5) internal successors, (36), 6 states have internal predecessors, (36), 1 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-02 22:35:26,613 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 770 transitions. [2021-11-02 22:35:26,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:35:26,614 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:26,614 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:26,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-02 22:35:26,615 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting remove_oneErr14REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:26,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:26,615 INFO L85 PathProgramCache]: Analyzing trace with hash 592306802, now seen corresponding path program 1 times [2021-11-02 22:35:26,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:26,616 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545865282] [2021-11-02 22:35:26,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:26,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:26,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:26,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:26,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:26,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:26,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:26,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:35:26,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:26,907 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:26,907 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:26,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545865282] [2021-11-02 22:35:26,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545865282] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:26,908 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:26,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:35:26,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683266650] [2021-11-02 22:35:26,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:35:26,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:26,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:35:26,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:35:26,913 INFO L87 Difference]: Start difference. First operand 602 states and 770 transitions. Second operand has 9 states, 9 states have (on average 4.0) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:27,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:27,958 INFO L93 Difference]: Finished difference Result 685 states and 858 transitions. [2021-11-02 22:35:27,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:35:27,959 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (5), 5 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 44 [2021-11-02 22:35:27,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:27,962 INFO L225 Difference]: With dead ends: 685 [2021-11-02 22:35:27,962 INFO L226 Difference]: Without dead ends: 685 [2021-11-02 22:35:27,962 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:35:27,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2021-11-02 22:35:27,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 602. [2021-11-02 22:35:27,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 481 states have (on average 1.3908523908523909) internal successors, (669), 532 states have internal predecessors, (669), 40 states have call successors, (40), 32 states have call predecessors, (40), 39 states have return successors, (57), 37 states have call predecessors, (57), 39 states have call successors, (57) [2021-11-02 22:35:27,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 766 transitions. [2021-11-02 22:35:27,976 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 766 transitions. Word has length 44 [2021-11-02 22:35:27,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:27,976 INFO L470 AbstractCegarLoop]: Abstraction has 602 states and 766 transitions. [2021-11-02 22:35:27,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 6 states have internal predecessors, (36), 3 states have call successors, (5), 5 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:27,976 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 766 transitions. [2021-11-02 22:35:27,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:35:27,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:27,977 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:27,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-02 22:35:27,977 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting append_oneErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:27,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:27,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1660536284, now seen corresponding path program 1 times [2021-11-02 22:35:27,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:27,978 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134933696] [2021-11-02 22:35:27,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:27,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:27,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:28,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:28,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-02 22:35:28,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:28,074 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:28,075 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134933696] [2021-11-02 22:35:28,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134933696] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:28,075 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:28,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:28,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88929047] [2021-11-02 22:35:28,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:35:28,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:28,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:35:28,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:35:28,076 INFO L87 Difference]: Start difference. First operand 602 states and 766 transitions. Second operand has 9 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:28,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:28,697 INFO L93 Difference]: Finished difference Result 726 states and 910 transitions. [2021-11-02 22:35:28,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:35:28,698 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-11-02 22:35:28,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:28,701 INFO L225 Difference]: With dead ends: 726 [2021-11-02 22:35:28,701 INFO L226 Difference]: Without dead ends: 726 [2021-11-02 22:35:28,701 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:28,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 726 states. [2021-11-02 22:35:28,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 726 to 626. [2021-11-02 22:35:28,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 626 states, 508 states have (on average 1.3838582677165354) internal successors, (703), 556 states have internal predecessors, (703), 40 states have call successors, (40), 32 states have call predecessors, (40), 39 states have return successors, (57), 37 states have call predecessors, (57), 39 states have call successors, (57) [2021-11-02 22:35:28,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 626 states to 626 states and 800 transitions. [2021-11-02 22:35:28,717 INFO L78 Accepts]: Start accepts. Automaton has 626 states and 800 transitions. Word has length 46 [2021-11-02 22:35:28,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:28,718 INFO L470 AbstractCegarLoop]: Abstraction has 626 states and 800 transitions. [2021-11-02 22:35:28,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 5.428571428571429) internal successors, (38), 7 states have internal predecessors, (38), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:28,718 INFO L276 IsEmpty]: Start isEmpty. Operand 626 states and 800 transitions. [2021-11-02 22:35:28,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:35:28,719 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:28,719 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:28,719 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-02 22:35:28,719 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting append_oneErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:28,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:28,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1660536285, now seen corresponding path program 1 times [2021-11-02 22:35:28,720 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:28,720 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284746472] [2021-11-02 22:35:28,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:28,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:28,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:28,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:28,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-02 22:35:28,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:28,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:28,896 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:28,896 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284746472] [2021-11-02 22:35:28,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284746472] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:28,897 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:28,897 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:35:28,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658257635] [2021-11-02 22:35:28,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:35:28,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:28,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:35:28,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:35:28,899 INFO L87 Difference]: Start difference. First operand 626 states and 800 transitions. Second operand has 11 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:29,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:29,789 INFO L93 Difference]: Finished difference Result 717 states and 898 transitions. [2021-11-02 22:35:29,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:29,789 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 46 [2021-11-02 22:35:29,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:29,793 INFO L225 Difference]: With dead ends: 717 [2021-11-02 22:35:29,793 INFO L226 Difference]: Without dead ends: 717 [2021-11-02 22:35:29,793 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:35:29,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2021-11-02 22:35:29,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 625. [2021-11-02 22:35:29,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 508 states have (on average 1.3799212598425197) internal successors, (701), 555 states have internal predecessors, (701), 40 states have call successors, (40), 32 states have call predecessors, (40), 39 states have return successors, (57), 37 states have call predecessors, (57), 39 states have call successors, (57) [2021-11-02 22:35:29,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 798 transitions. [2021-11-02 22:35:29,809 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 798 transitions. Word has length 46 [2021-11-02 22:35:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:29,809 INFO L470 AbstractCegarLoop]: Abstraction has 625 states and 798 transitions. [2021-11-02 22:35:29,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:29,810 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 798 transitions. [2021-11-02 22:35:29,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:35:29,810 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:29,811 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:29,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-02 22:35:29,811 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting append_oneErr5REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:29,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:29,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1660536446, now seen corresponding path program 1 times [2021-11-02 22:35:29,811 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:29,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797011875] [2021-11-02 22:35:29,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:29,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:29,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:29,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:29,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:29,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:29,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:29,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-02 22:35:29,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:30,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:30,093 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:30,093 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797011875] [2021-11-02 22:35:30,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797011875] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:30,093 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:30,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:35:30,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167905196] [2021-11-02 22:35:30,094 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:35:30,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:30,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:35:30,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:30,095 INFO L87 Difference]: Start difference. First operand 625 states and 798 transitions. Second operand has 12 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:31,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:31,558 INFO L93 Difference]: Finished difference Result 921 states and 1126 transitions. [2021-11-02 22:35:31,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:35:31,558 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 46 [2021-11-02 22:35:31,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:31,562 INFO L225 Difference]: With dead ends: 921 [2021-11-02 22:35:31,562 INFO L226 Difference]: Without dead ends: 921 [2021-11-02 22:35:31,563 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:35:31,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 921 states. [2021-11-02 22:35:31,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 921 to 625. [2021-11-02 22:35:31,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 508 states have (on average 1.375984251968504) internal successors, (699), 555 states have internal predecessors, (699), 40 states have call successors, (40), 32 states have call predecessors, (40), 39 states have return successors, (57), 37 states have call predecessors, (57), 39 states have call successors, (57) [2021-11-02 22:35:31,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 796 transitions. [2021-11-02 22:35:31,584 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 796 transitions. Word has length 46 [2021-11-02 22:35:31,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:31,584 INFO L470 AbstractCegarLoop]: Abstraction has 625 states and 796 transitions. [2021-11-02 22:35:31,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 3.8) internal successors, (38), 9 states have internal predecessors, (38), 3 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:31,585 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 796 transitions. [2021-11-02 22:35:31,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:35:31,586 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:31,586 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:31,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-02 22:35:31,586 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:31,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:31,587 INFO L85 PathProgramCache]: Analyzing trace with hash -926807313, now seen corresponding path program 1 times [2021-11-02 22:35:31,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:31,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784606828] [2021-11-02 22:35:31,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:31,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:31,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:31,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:31,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:31,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:31,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:31,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:31,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:31,657 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:31,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:31,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:31,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:31,686 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:31,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:31,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784606828] [2021-11-02 22:35:31,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784606828] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:31,687 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:31,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:35:31,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518147170] [2021-11-02 22:35:31,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:35:31,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:31,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:35:31,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:35:31,689 INFO L87 Difference]: Start difference. First operand 625 states and 796 transitions. Second operand has 8 states, 8 states have (on average 6.375) internal successors, (51), 4 states have internal predecessors, (51), 1 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-02 22:35:32,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:32,162 INFO L93 Difference]: Finished difference Result 634 states and 800 transitions. [2021-11-02 22:35:32,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:35:32,163 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.375) internal successors, (51), 4 states have internal predecessors, (51), 1 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 62 [2021-11-02 22:35:32,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:32,167 INFO L225 Difference]: With dead ends: 634 [2021-11-02 22:35:32,167 INFO L226 Difference]: Without dead ends: 626 [2021-11-02 22:35:32,167 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:35:32,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2021-11-02 22:35:32,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 526. [2021-11-02 22:35:32,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 423 states have (on average 1.387706855791962) internal successors, (587), 468 states have internal predecessors, (587), 33 states have call successors, (33), 26 states have call predecessors, (33), 31 states have return successors, (43), 31 states have call predecessors, (43), 32 states have call successors, (43) [2021-11-02 22:35:32,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 663 transitions. [2021-11-02 22:35:32,181 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 663 transitions. Word has length 62 [2021-11-02 22:35:32,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:32,182 INFO L470 AbstractCegarLoop]: Abstraction has 526 states and 663 transitions. [2021-11-02 22:35:32,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 6.375) internal successors, (51), 4 states have internal predecessors, (51), 1 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-02 22:35:32,182 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 663 transitions. [2021-11-02 22:35:32,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-02 22:35:32,183 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:32,183 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:32,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-02 22:35:32,184 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:32,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:32,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1955550686, now seen corresponding path program 1 times [2021-11-02 22:35:32,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:32,185 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189433817] [2021-11-02 22:35:32,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:32,185 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:32,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:32,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:32,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:32,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:32,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:32,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,308 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:35:32,308 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:32,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189433817] [2021-11-02 22:35:32,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189433817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:32,309 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374270521] [2021-11-02 22:35:32,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:32,310 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:32,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:32,315 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:32,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:35:32,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:32,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:35:32,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:32,800 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:32,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374270521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:32,800 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:32,800 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2021-11-02 22:35:32,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459062287] [2021-11-02 22:35:32,801 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:35:32,801 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:32,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:35:32,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:32,802 INFO L87 Difference]: Start difference. First operand 526 states and 663 transitions. Second operand has 12 states, 12 states have (on average 6.416666666666667) internal successors, (77), 8 states have internal predecessors, (77), 2 states have call successors, (11), 5 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-02 22:35:33,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:33,770 INFO L93 Difference]: Finished difference Result 685 states and 890 transitions. [2021-11-02 22:35:33,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:35:33,770 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 6.416666666666667) internal successors, (77), 8 states have internal predecessors, (77), 2 states have call successors, (11), 5 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 63 [2021-11-02 22:35:33,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:33,775 INFO L225 Difference]: With dead ends: 685 [2021-11-02 22:35:33,775 INFO L226 Difference]: Without dead ends: 679 [2021-11-02 22:35:33,776 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:35:33,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-11-02 22:35:33,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 579. [2021-11-02 22:35:33,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 579 states, 466 states have (on average 1.3669527896995708) internal successors, (637), 511 states have internal predecessors, (637), 43 states have call successors, (43), 26 states have call predecessors, (43), 31 states have return successors, (59), 41 states have call predecessors, (59), 42 states have call successors, (59) [2021-11-02 22:35:33,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 579 states to 579 states and 739 transitions. [2021-11-02 22:35:33,794 INFO L78 Accepts]: Start accepts. Automaton has 579 states and 739 transitions. Word has length 63 [2021-11-02 22:35:33,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:33,795 INFO L470 AbstractCegarLoop]: Abstraction has 579 states and 739 transitions. [2021-11-02 22:35:33,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 6.416666666666667) internal successors, (77), 8 states have internal predecessors, (77), 2 states have call successors, (11), 5 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-02 22:35:33,795 INFO L276 IsEmpty]: Start isEmpty. Operand 579 states and 739 transitions. [2021-11-02 22:35:33,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-02 22:35:33,797 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:33,797 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:33,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:34,013 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:34,014 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:34,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:34,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1294201570, now seen corresponding path program 1 times [2021-11-02 22:35:34,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:34,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912375494] [2021-11-02 22:35:34,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:34,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:34,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,115 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:34,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:34,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:34,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:34,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,214 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:34,214 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:34,215 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912375494] [2021-11-02 22:35:34,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912375494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:34,215 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:34,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:35:34,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388580274] [2021-11-02 22:35:34,217 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:34,217 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:34,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:34,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:34,218 INFO L87 Difference]: Start difference. First operand 579 states and 739 transitions. Second operand has 10 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:35,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:35,138 INFO L93 Difference]: Finished difference Result 661 states and 837 transitions. [2021-11-02 22:35:35,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:35,139 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 63 [2021-11-02 22:35:35,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:35,142 INFO L225 Difference]: With dead ends: 661 [2021-11-02 22:35:35,143 INFO L226 Difference]: Without dead ends: 661 [2021-11-02 22:35:35,143 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:35:35,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-11-02 22:35:35,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 581. [2021-11-02 22:35:35,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 581 states, 468 states have (on average 1.3675213675213675) internal successors, (640), 513 states have internal predecessors, (640), 43 states have call successors, (43), 26 states have call predecessors, (43), 31 states have return successors, (59), 41 states have call predecessors, (59), 42 states have call successors, (59) [2021-11-02 22:35:35,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 581 states to 581 states and 742 transitions. [2021-11-02 22:35:35,157 INFO L78 Accepts]: Start accepts. Automaton has 581 states and 742 transitions. Word has length 63 [2021-11-02 22:35:35,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:35,158 INFO L470 AbstractCegarLoop]: Abstraction has 581 states and 742 transitions. [2021-11-02 22:35:35,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:35,158 INFO L276 IsEmpty]: Start isEmpty. Operand 581 states and 742 transitions. [2021-11-02 22:35:35,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-02 22:35:35,159 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:35,159 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:35,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-02 22:35:35,160 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:35,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:35,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1294201508, now seen corresponding path program 1 times [2021-11-02 22:35:35,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:35,160 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095747534] [2021-11-02 22:35:35,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:35,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:35,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:35,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:35,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:35,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:35,386 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:35,386 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:35,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095747534] [2021-11-02 22:35:35,386 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095747534] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:35,387 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:35,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:35:35,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456618238] [2021-11-02 22:35:35,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:35,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:35,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:35,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:35,388 INFO L87 Difference]: Start difference. First operand 581 states and 742 transitions. Second operand has 10 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:36,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:36,464 INFO L93 Difference]: Finished difference Result 660 states and 835 transitions. [2021-11-02 22:35:36,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:35:36,464 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 63 [2021-11-02 22:35:36,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:36,468 INFO L225 Difference]: With dead ends: 660 [2021-11-02 22:35:36,468 INFO L226 Difference]: Without dead ends: 660 [2021-11-02 22:35:36,468 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:35:36,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-11-02 22:35:36,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 578. [2021-11-02 22:35:36,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 466 states have (on average 1.3626609442060085) internal successors, (635), 510 states have internal predecessors, (635), 43 states have call successors, (43), 26 states have call predecessors, (43), 31 states have return successors, (59), 41 states have call predecessors, (59), 42 states have call successors, (59) [2021-11-02 22:35:36,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 737 transitions. [2021-11-02 22:35:36,483 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 737 transitions. Word has length 63 [2021-11-02 22:35:36,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:36,484 INFO L470 AbstractCegarLoop]: Abstraction has 578 states and 737 transitions. [2021-11-02 22:35:36,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 6.75) internal successors, (54), 8 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:36,484 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 737 transitions. [2021-11-02 22:35:36,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:35:36,485 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:36,485 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:36,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-02 22:35:36,486 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting is_emptyErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:36,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:36,486 INFO L85 PathProgramCache]: Analyzing trace with hash 689103713, now seen corresponding path program 1 times [2021-11-02 22:35:36,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:36,487 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382348414] [2021-11-02 22:35:36,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:36,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:36,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:36,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:36,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:36,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:36,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:36,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:36,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:36,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:36,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:36,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-11-02 22:35:36,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:36,727 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:35:36,727 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:36,727 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382348414] [2021-11-02 22:35:36,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382348414] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:36,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:36,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:35:36,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57250027] [2021-11-02 22:35:36,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:35:36,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:36,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:35:36,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:35:36,729 INFO L87 Difference]: Start difference. First operand 578 states and 737 transitions. Second operand has 12 states, 10 states have (on average 5.1) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:35:37,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:37,970 INFO L93 Difference]: Finished difference Result 630 states and 798 transitions. [2021-11-02 22:35:37,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:35:37,970 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 5.1) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 66 [2021-11-02 22:35:37,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:37,975 INFO L225 Difference]: With dead ends: 630 [2021-11-02 22:35:37,975 INFO L226 Difference]: Without dead ends: 630 [2021-11-02 22:35:37,976 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:35:37,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-11-02 22:35:37,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 572. [2021-11-02 22:35:37,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 572 states, 465 states have (on average 1.3376344086021505) internal successors, (622), 504 states have internal predecessors, (622), 43 states have call successors, (43), 26 states have call predecessors, (43), 31 states have return successors, (59), 41 states have call predecessors, (59), 42 states have call successors, (59) [2021-11-02 22:35:37,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 572 states to 572 states and 724 transitions. [2021-11-02 22:35:37,992 INFO L78 Accepts]: Start accepts. Automaton has 572 states and 724 transitions. Word has length 66 [2021-11-02 22:35:37,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:37,993 INFO L470 AbstractCegarLoop]: Abstraction has 572 states and 724 transitions. [2021-11-02 22:35:37,993 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 5.1) internal successors, (51), 8 states have internal predecessors, (51), 5 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:35:37,993 INFO L276 IsEmpty]: Start isEmpty. Operand 572 states and 724 transitions. [2021-11-02 22:35:37,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-02 22:35:37,995 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:37,996 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:37,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-02 22:35:37,996 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:37,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:37,997 INFO L85 PathProgramCache]: Analyzing trace with hash 434277069, now seen corresponding path program 1 times [2021-11-02 22:35:37,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:37,997 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069771078] [2021-11-02 22:35:37,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:37,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:38,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:38,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:38,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:38,067 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:38,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:38,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:38,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:38,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:38,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:38,139 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:38,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:38,156 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:35:38,156 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:38,156 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069771078] [2021-11-02 22:35:38,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2069771078] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:38,157 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:38,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:35:38,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874531956] [2021-11-02 22:35:38,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:35:38,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:38,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:35:38,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:35:38,160 INFO L87 Difference]: Start difference. First operand 572 states and 724 transitions. Second operand has 10 states, 9 states have (on average 5.777777777777778) internal successors, (52), 6 states have internal predecessors, (52), 2 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 22:35:39,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:39,328 INFO L93 Difference]: Finished difference Result 931 states and 1195 transitions. [2021-11-02 22:35:39,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:35:39,354 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 5.777777777777778) internal successors, (52), 6 states have internal predecessors, (52), 2 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 64 [2021-11-02 22:35:39,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:39,361 INFO L225 Difference]: With dead ends: 931 [2021-11-02 22:35:39,361 INFO L226 Difference]: Without dead ends: 931 [2021-11-02 22:35:39,362 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=414, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:35:39,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2021-11-02 22:35:39,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 775. [2021-11-02 22:35:39,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 775 states, 632 states have (on average 1.3370253164556962) internal successors, (845), 678 states have internal predecessors, (845), 63 states have call successors, (63), 37 states have call predecessors, (63), 47 states have return successors, (110), 59 states have call predecessors, (110), 62 states have call successors, (110) [2021-11-02 22:35:39,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 1018 transitions. [2021-11-02 22:35:39,387 INFO L78 Accepts]: Start accepts. Automaton has 775 states and 1018 transitions. Word has length 64 [2021-11-02 22:35:39,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:39,388 INFO L470 AbstractCegarLoop]: Abstraction has 775 states and 1018 transitions. [2021-11-02 22:35:39,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 5.777777777777778) internal successors, (52), 6 states have internal predecessors, (52), 2 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 22:35:39,388 INFO L276 IsEmpty]: Start isEmpty. Operand 775 states and 1018 transitions. [2021-11-02 22:35:39,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-02 22:35:39,390 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:39,390 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:39,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-02 22:35:39,391 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting is_emptyErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:39,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:39,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1433356208, now seen corresponding path program 1 times [2021-11-02 22:35:39,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:39,392 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758483126] [2021-11-02 22:35:39,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:39,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:39,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:39,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:39,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:39,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,536 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:39,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:39,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,604 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-11-02 22:35:39,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,608 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:35:39,609 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:39,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758483126] [2021-11-02 22:35:39,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758483126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:39,609 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382945843] [2021-11-02 22:35:39,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:39,610 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:39,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:39,611 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:39,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:35:39,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-02 22:35:39,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:40,136 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:40,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382945843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:40,137 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:40,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 17 [2021-11-02 22:35:40,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011987883] [2021-11-02 22:35:40,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:35:40,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:40,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:35:40,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=235, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:35:40,139 INFO L87 Difference]: Start difference. First operand 775 states and 1018 transitions. Second operand has 17 states, 16 states have (on average 5.0) internal successors, (80), 12 states have internal predecessors, (80), 5 states have call successors, (16), 8 states have call predecessors, (16), 5 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-02 22:35:41,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:41,852 INFO L93 Difference]: Finished difference Result 936 states and 1197 transitions. [2021-11-02 22:35:41,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:35:41,852 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 5.0) internal successors, (80), 12 states have internal predecessors, (80), 5 states have call successors, (16), 8 states have call predecessors, (16), 5 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 67 [2021-11-02 22:35:41,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:41,857 INFO L225 Difference]: With dead ends: 936 [2021-11-02 22:35:41,857 INFO L226 Difference]: Without dead ends: 930 [2021-11-02 22:35:41,858 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=234, Invalid=1172, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:35:41,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 930 states. [2021-11-02 22:35:41,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 930 to 778. [2021-11-02 22:35:41,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 778 states, 635 states have (on average 1.330708661417323) internal successors, (845), 681 states have internal predecessors, (845), 63 states have call successors, (63), 37 states have call predecessors, (63), 47 states have return successors, (110), 59 states have call predecessors, (110), 62 states have call successors, (110) [2021-11-02 22:35:41,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1018 transitions. [2021-11-02 22:35:41,880 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1018 transitions. Word has length 67 [2021-11-02 22:35:41,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:41,881 INFO L470 AbstractCegarLoop]: Abstraction has 778 states and 1018 transitions. [2021-11-02 22:35:41,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 5.0) internal successors, (80), 12 states have internal predecessors, (80), 5 states have call successors, (16), 8 states have call predecessors, (16), 5 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-11-02 22:35:41,881 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1018 transitions. [2021-11-02 22:35:41,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:35:41,884 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:41,884 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:41,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:42,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:35:42,110 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:42,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:42,110 INFO L85 PathProgramCache]: Analyzing trace with hash 362610441, now seen corresponding path program 1 times [2021-11-02 22:35:42,111 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:42,111 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055834329] [2021-11-02 22:35:42,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:42,111 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:42,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:42,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:42,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:42,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:42,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:42,315 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:42,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:42,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:42,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:43,018 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:43,018 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:43,018 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055834329] [2021-11-02 22:35:43,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055834329] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:43,018 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:43,018 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-11-02 22:35:43,018 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568738454] [2021-11-02 22:35:43,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:35:43,019 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:43,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:35:43,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:35:43,020 INFO L87 Difference]: Start difference. First operand 778 states and 1018 transitions. Second operand has 19 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 15 states have internal predecessors, (57), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:35:45,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:45,233 INFO L93 Difference]: Finished difference Result 963 states and 1250 transitions. [2021-11-02 22:35:45,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:35:45,234 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 15 states have internal predecessors, (57), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 66 [2021-11-02 22:35:45,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:45,240 INFO L225 Difference]: With dead ends: 963 [2021-11-02 22:35:45,241 INFO L226 Difference]: Without dead ends: 963 [2021-11-02 22:35:45,241 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:35:45,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 963 states. [2021-11-02 22:35:45,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 963 to 786. [2021-11-02 22:35:45,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 786 states, 642 states have (on average 1.3302180685358256) internal successors, (854), 688 states have internal predecessors, (854), 63 states have call successors, (63), 37 states have call predecessors, (63), 48 states have return successors, (111), 60 states have call predecessors, (111), 62 states have call successors, (111) [2021-11-02 22:35:45,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 786 states to 786 states and 1028 transitions. [2021-11-02 22:35:45,262 INFO L78 Accepts]: Start accepts. Automaton has 786 states and 1028 transitions. Word has length 66 [2021-11-02 22:35:45,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:45,263 INFO L470 AbstractCegarLoop]: Abstraction has 786 states and 1028 transitions. [2021-11-02 22:35:45,263 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 15 states have internal predecessors, (57), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:35:45,263 INFO L276 IsEmpty]: Start isEmpty. Operand 786 states and 1028 transitions. [2021-11-02 22:35:45,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-02 22:35:45,266 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:45,266 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:45,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-02 22:35:45,267 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:45,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:45,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1734019633, now seen corresponding path program 1 times [2021-11-02 22:35:45,268 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:45,268 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474416632] [2021-11-02 22:35:45,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:45,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:45,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:45,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:45,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:45,456 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:45,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:45,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:45,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:45,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:45,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:46,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:46,418 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:46,418 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474416632] [2021-11-02 22:35:46,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474416632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:46,418 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:46,418 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-02 22:35:46,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067000058] [2021-11-02 22:35:46,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-02 22:35:46,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:46,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-02 22:35:46,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=232, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:35:46,420 INFO L87 Difference]: Start difference. First operand 786 states and 1028 transitions. Second operand has 17 states, 16 states have (on average 3.625) internal successors, (58), 14 states have internal predecessors, (58), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:35:48,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:48,394 INFO L93 Difference]: Finished difference Result 961 states and 1249 transitions. [2021-11-02 22:35:48,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:35:48,394 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.625) internal successors, (58), 14 states have internal predecessors, (58), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 67 [2021-11-02 22:35:48,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:48,399 INFO L225 Difference]: With dead ends: 961 [2021-11-02 22:35:48,399 INFO L226 Difference]: Without dead ends: 961 [2021-11-02 22:35:48,400 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:35:48,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2021-11-02 22:35:48,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 796. [2021-11-02 22:35:48,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 651 states have (on average 1.3287250384024578) internal successors, (865), 697 states have internal predecessors, (865), 63 states have call successors, (63), 37 states have call predecessors, (63), 49 states have return successors, (112), 61 states have call predecessors, (112), 62 states have call successors, (112) [2021-11-02 22:35:48,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 1040 transitions. [2021-11-02 22:35:48,418 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 1040 transitions. Word has length 67 [2021-11-02 22:35:48,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:48,419 INFO L470 AbstractCegarLoop]: Abstraction has 796 states and 1040 transitions. [2021-11-02 22:35:48,419 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.625) internal successors, (58), 14 states have internal predecessors, (58), 4 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:35:48,419 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 1040 transitions. [2021-11-02 22:35:48,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:35:48,421 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:48,421 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:48,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2021-11-02 22:35:48,421 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:48,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:48,422 INFO L85 PathProgramCache]: Analyzing trace with hash -2014432239, now seen corresponding path program 1 times [2021-11-02 22:35:48,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:48,422 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436771645] [2021-11-02 22:35:48,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:48,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:48,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:48,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:48,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:48,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:48,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:48,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:48,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:48,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:48,991 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:48,992 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:48,992 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436771645] [2021-11-02 22:35:48,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436771645] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:48,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:48,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-11-02 22:35:48,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248004231] [2021-11-02 22:35:48,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:35:48,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:48,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:35:48,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:35:48,994 INFO L87 Difference]: Start difference. First operand 796 states and 1040 transitions. Second operand has 20 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:51,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:51,190 INFO L93 Difference]: Finished difference Result 1181 states and 1558 transitions. [2021-11-02 22:35:51,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:35:51,194 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 68 [2021-11-02 22:35:51,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:51,201 INFO L225 Difference]: With dead ends: 1181 [2021-11-02 22:35:51,201 INFO L226 Difference]: Without dead ends: 1181 [2021-11-02 22:35:51,202 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=234, Invalid=1658, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:35:51,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1181 states. [2021-11-02 22:35:51,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1181 to 951. [2021-11-02 22:35:51,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 951 states, 777 states have (on average 1.3307593307593308) internal successors, (1034), 826 states have internal predecessors, (1034), 81 states have call successors, (81), 46 states have call predecessors, (81), 61 states have return successors, (150), 78 states have call predecessors, (150), 80 states have call successors, (150) [2021-11-02 22:35:51,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 951 states to 951 states and 1265 transitions. [2021-11-02 22:35:51,241 INFO L78 Accepts]: Start accepts. Automaton has 951 states and 1265 transitions. Word has length 68 [2021-11-02 22:35:51,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:51,241 INFO L470 AbstractCegarLoop]: Abstraction has 951 states and 1265 transitions. [2021-11-02 22:35:51,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:51,242 INFO L276 IsEmpty]: Start isEmpty. Operand 951 states and 1265 transitions. [2021-11-02 22:35:51,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:35:51,243 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:51,243 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:51,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-02 22:35:51,244 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting mainErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:51,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:51,244 INFO L85 PathProgramCache]: Analyzing trace with hash -2014432238, now seen corresponding path program 1 times [2021-11-02 22:35:51,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:51,245 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046325716] [2021-11-02 22:35:51,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:51,245 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:51,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:51,496 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:51,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:51,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:51,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:51,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:51,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:51,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:51,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:52,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:52,022 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:52,022 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046325716] [2021-11-02 22:35:52,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2046325716] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:52,022 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:52,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-11-02 22:35:52,022 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577836439] [2021-11-02 22:35:52,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:35:52,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:52,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:35:52,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=304, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:35:52,024 INFO L87 Difference]: Start difference. First operand 951 states and 1265 transitions. Second operand has 19 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:54,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:54,715 INFO L93 Difference]: Finished difference Result 1271 states and 1677 transitions. [2021-11-02 22:35:54,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:35:54,716 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 68 [2021-11-02 22:35:54,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:54,724 INFO L225 Difference]: With dead ends: 1271 [2021-11-02 22:35:54,724 INFO L226 Difference]: Without dead ends: 1271 [2021-11-02 22:35:54,725 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=200, Invalid=1360, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:35:54,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1271 states. [2021-11-02 22:35:54,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1271 to 1014. [2021-11-02 22:35:54,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1014 states, 829 states have (on average 1.3317249698431846) internal successors, (1104), 880 states have internal predecessors, (1104), 87 states have call successors, (87), 49 states have call predecessors, (87), 66 states have return successors, (169), 84 states have call predecessors, (169), 86 states have call successors, (169) [2021-11-02 22:35:54,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1014 states to 1014 states and 1360 transitions. [2021-11-02 22:35:54,774 INFO L78 Accepts]: Start accepts. Automaton has 1014 states and 1360 transitions. Word has length 68 [2021-11-02 22:35:54,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:54,775 INFO L470 AbstractCegarLoop]: Abstraction has 1014 states and 1360 transitions. [2021-11-02 22:35:54,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.4705882352941178) internal successors, (59), 16 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:54,775 INFO L276 IsEmpty]: Start isEmpty. Operand 1014 states and 1360 transitions. [2021-11-02 22:35:54,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:35:54,776 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:54,777 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:54,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2021-11-02 22:35:54,777 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:54,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:54,778 INFO L85 PathProgramCache]: Analyzing trace with hash -2012585197, now seen corresponding path program 1 times [2021-11-02 22:35:54,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:54,778 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701152375] [2021-11-02 22:35:54,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:54,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:54,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:54,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:54,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:54,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:54,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:54,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:54,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:55,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:55,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:55,130 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:55,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:55,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701152375] [2021-11-02 22:35:55,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701152375] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:55,131 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:55,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-02 22:35:55,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933522135] [2021-11-02 22:35:55,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 22:35:55,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:55,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 22:35:55,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:35:55,133 INFO L87 Difference]: Start difference. First operand 1014 states and 1360 transitions. Second operand has 16 states, 14 states have (on average 4.214285714285714) internal successors, (59), 13 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:56,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:56,568 INFO L93 Difference]: Finished difference Result 1543 states and 2093 transitions. [2021-11-02 22:35:56,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:35:56,568 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 4.214285714285714) internal successors, (59), 13 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 68 [2021-11-02 22:35:56,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:56,576 INFO L225 Difference]: With dead ends: 1543 [2021-11-02 22:35:56,576 INFO L226 Difference]: Without dead ends: 1543 [2021-11-02 22:35:56,577 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=965, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:35:56,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1543 states. [2021-11-02 22:35:56,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1543 to 1303. [2021-11-02 22:35:56,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1303 states, 1060 states have (on average 1.3283018867924528) internal successors, (1408), 1116 states have internal predecessors, (1408), 123 states have call successors, (123), 67 states have call predecessors, (123), 88 states have return successors, (249), 119 states have call predecessors, (249), 122 states have call successors, (249) [2021-11-02 22:35:56,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 1780 transitions. [2021-11-02 22:35:56,612 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 1780 transitions. Word has length 68 [2021-11-02 22:35:56,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:56,613 INFO L470 AbstractCegarLoop]: Abstraction has 1303 states and 1780 transitions. [2021-11-02 22:35:56,613 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 4.214285714285714) internal successors, (59), 13 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:56,614 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 1780 transitions. [2021-11-02 22:35:56,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:35:56,615 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:56,615 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:56,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-02 22:35:56,616 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting mainErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:56,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:56,616 INFO L85 PathProgramCache]: Analyzing trace with hash -2012585196, now seen corresponding path program 1 times [2021-11-02 22:35:56,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:56,617 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860398190] [2021-11-02 22:35:56,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:56,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:56,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:56,806 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:56,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:56,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:35:56,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:56,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:35:56,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:57,012 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:57,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:57,089 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:57,090 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:57,090 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860398190] [2021-11-02 22:35:57,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860398190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:57,090 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:35:57,091 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-02 22:35:57,091 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816171015] [2021-11-02 22:35:57,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 22:35:57,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:57,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 22:35:57,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:35:57,092 INFO L87 Difference]: Start difference. First operand 1303 states and 1780 transitions. Second operand has 16 states, 14 states have (on average 4.214285714285714) internal successors, (59), 13 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:59,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:59,078 INFO L93 Difference]: Finished difference Result 1689 states and 2293 transitions. [2021-11-02 22:35:59,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:35:59,079 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 4.214285714285714) internal successors, (59), 13 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 68 [2021-11-02 22:35:59,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:59,085 INFO L225 Difference]: With dead ends: 1689 [2021-11-02 22:35:59,086 INFO L226 Difference]: Without dead ends: 1689 [2021-11-02 22:35:59,087 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=145, Invalid=847, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:35:59,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1689 states. [2021-11-02 22:35:59,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1689 to 1412. [2021-11-02 22:35:59,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1412 states, 1147 states have (on average 1.3286835222319093) internal successors, (1524), 1207 states have internal predecessors, (1524), 135 states have call successors, (135), 73 states have call predecessors, (135), 98 states have return successors, (281), 131 states have call predecessors, (281), 134 states have call successors, (281) [2021-11-02 22:35:59,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1412 states to 1412 states and 1940 transitions. [2021-11-02 22:35:59,129 INFO L78 Accepts]: Start accepts. Automaton has 1412 states and 1940 transitions. Word has length 68 [2021-11-02 22:35:59,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:59,130 INFO L470 AbstractCegarLoop]: Abstraction has 1412 states and 1940 transitions. [2021-11-02 22:35:59,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 4.214285714285714) internal successors, (59), 13 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:35:59,131 INFO L276 IsEmpty]: Start isEmpty. Operand 1412 states and 1940 transitions. [2021-11-02 22:35:59,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-02 22:35:59,132 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:59,132 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:59,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-02 22:35:59,133 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:35:59,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:59,133 INFO L85 PathProgramCache]: Analyzing trace with hash -883810716, now seen corresponding path program 1 times [2021-11-02 22:35:59,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:59,134 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713816905] [2021-11-02 22:35:59,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:59,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:59,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:59,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,200 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:35:59,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:59,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,229 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:35:59,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:35:59,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,291 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:59,291 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:59,291 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713816905] [2021-11-02 22:35:59,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713816905] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:59,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101836324] [2021-11-02 22:35:59,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:59,292 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:59,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:59,293 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:59,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:35:59,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:59,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:35:59,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:59,779 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:59,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101836324] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:59,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:59,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 11 [2021-11-02 22:35:59,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566693808] [2021-11-02 22:35:59,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:35:59,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:59,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:35:59,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:35:59,783 INFO L87 Difference]: Start difference. First operand 1412 states and 1940 transitions. Second operand has 11 states, 11 states have (on average 5.636363636363637) internal successors, (62), 7 states have internal predecessors, (62), 1 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-02 22:36:00,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:00,310 INFO L93 Difference]: Finished difference Result 1477 states and 2024 transitions. [2021-11-02 22:36:00,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:36:00,311 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.636363636363637) internal successors, (62), 7 states have internal predecessors, (62), 1 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 69 [2021-11-02 22:36:00,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:00,315 INFO L225 Difference]: With dead ends: 1477 [2021-11-02 22:36:00,315 INFO L226 Difference]: Without dead ends: 1471 [2021-11-02 22:36:00,316 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:36:00,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1471 states. [2021-11-02 22:36:00,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1471 to 1417. [2021-11-02 22:36:00,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1417 states, 1151 states have (on average 1.3275412684622068) internal successors, (1528), 1212 states have internal predecessors, (1528), 135 states have call successors, (135), 73 states have call predecessors, (135), 99 states have return successors, (287), 131 states have call predecessors, (287), 134 states have call successors, (287) [2021-11-02 22:36:00,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1417 states to 1417 states and 1950 transitions. [2021-11-02 22:36:00,351 INFO L78 Accepts]: Start accepts. Automaton has 1417 states and 1950 transitions. Word has length 69 [2021-11-02 22:36:00,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:00,352 INFO L470 AbstractCegarLoop]: Abstraction has 1417 states and 1950 transitions. [2021-11-02 22:36:00,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 5.636363636363637) internal successors, (62), 7 states have internal predecessors, (62), 1 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-02 22:36:00,352 INFO L276 IsEmpty]: Start isEmpty. Operand 1417 states and 1950 transitions. [2021-11-02 22:36:00,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-02 22:36:00,353 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:00,354 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:00,390 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-02 22:36:00,569 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-02 22:36:00,569 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:00,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:00,570 INFO L85 PathProgramCache]: Analyzing trace with hash 1977108733, now seen corresponding path program 1 times [2021-11-02 22:36:00,570 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:00,570 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863842059] [2021-11-02 22:36:00,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:00,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:00,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:00,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:00,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:00,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:00,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,663 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:00,664 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:00,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863842059] [2021-11-02 22:36:00,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863842059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:00,664 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645658514] [2021-11-02 22:36:00,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:00,665 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:00,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:00,666 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:00,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:36:01,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-02 22:36:01,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:01,234 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:01,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645658514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:01,234 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:01,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2021-11-02 22:36:01,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115643057] [2021-11-02 22:36:01,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:36:01,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:01,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:36:01,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:36:01,236 INFO L87 Difference]: Start difference. First operand 1417 states and 1950 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-02 22:36:01,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:01,266 INFO L93 Difference]: Finished difference Result 1658 states and 2348 transitions. [2021-11-02 22:36:01,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:36:01,266 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 69 [2021-11-02 22:36:01,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:01,273 INFO L225 Difference]: With dead ends: 1658 [2021-11-02 22:36:01,273 INFO L226 Difference]: Without dead ends: 1658 [2021-11-02 22:36:01,274 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:36:01,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1658 states. [2021-11-02 22:36:01,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1658 to 1627. [2021-11-02 22:36:01,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1627 states, 1337 states have (on average 1.3343305908750935) internal successors, (1784), 1395 states have internal predecessors, (1784), 159 states have call successors, (159), 73 states have call predecessors, (159), 99 states have return successors, (351), 158 states have call predecessors, (351), 158 states have call successors, (351) [2021-11-02 22:36:01,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1627 states to 1627 states and 2294 transitions. [2021-11-02 22:36:01,319 INFO L78 Accepts]: Start accepts. Automaton has 1627 states and 2294 transitions. Word has length 69 [2021-11-02 22:36:01,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:01,320 INFO L470 AbstractCegarLoop]: Abstraction has 1627 states and 2294 transitions. [2021-11-02 22:36:01,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-02 22:36:01,320 INFO L276 IsEmpty]: Start isEmpty. Operand 1627 states and 2294 transitions. [2021-11-02 22:36:01,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-02 22:36:01,322 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:01,322 INFO L513 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:01,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:01,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-02 22:36:01,538 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:01,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:01,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1055491947, now seen corresponding path program 2 times [2021-11-02 22:36:01,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:01,539 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887757158] [2021-11-02 22:36:01,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:01,539 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:01,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,588 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:01,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,592 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:36:01,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:36:01,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:01,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:36:01,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:01,687 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:01,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:01,687 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887757158] [2021-11-02 22:36:01,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887757158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:01,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [306017745] [2021-11-02 22:36:01,688 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:36:01,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:01,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:01,689 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:01,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:36:02,030 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:36:02,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:02,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:36:02,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:02,249 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:02,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [306017745] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:02,249 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:02,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 12 [2021-11-02 22:36:02,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914025874] [2021-11-02 22:36:02,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:36:02,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:02,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:36:02,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:36:02,251 INFO L87 Difference]: Start difference. First operand 1627 states and 2294 transitions. Second operand has 12 states, 12 states have (on average 5.25) internal successors, (63), 8 states have internal predecessors, (63), 1 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-02 22:36:02,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:02,874 INFO L93 Difference]: Finished difference Result 1690 states and 2371 transitions. [2021-11-02 22:36:02,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:36:02,875 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.25) internal successors, (63), 8 states have internal predecessors, (63), 1 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 70 [2021-11-02 22:36:02,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:02,880 INFO L225 Difference]: With dead ends: 1690 [2021-11-02 22:36:02,880 INFO L226 Difference]: Without dead ends: 1684 [2021-11-02 22:36:02,881 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:36:02,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1684 states. [2021-11-02 22:36:02,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1684 to 1630. [2021-11-02 22:36:02,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1630 states, 1340 states have (on average 1.3335820895522388) internal successors, (1787), 1398 states have internal predecessors, (1787), 159 states have call successors, (159), 73 states have call predecessors, (159), 99 states have return successors, (351), 158 states have call predecessors, (351), 158 states have call successors, (351) [2021-11-02 22:36:02,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1630 states to 1630 states and 2297 transitions. [2021-11-02 22:36:02,919 INFO L78 Accepts]: Start accepts. Automaton has 1630 states and 2297 transitions. Word has length 70 [2021-11-02 22:36:02,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:02,919 INFO L470 AbstractCegarLoop]: Abstraction has 1630 states and 2297 transitions. [2021-11-02 22:36:02,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 5.25) internal successors, (63), 8 states have internal predecessors, (63), 1 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-02 22:36:02,919 INFO L276 IsEmpty]: Start isEmpty. Operand 1630 states and 2297 transitions. [2021-11-02 22:36:02,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-02 22:36:02,921 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:02,921 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:02,956 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:03,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:03,134 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting create_itemErr4REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:03,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:03,134 INFO L85 PathProgramCache]: Analyzing trace with hash 593208646, now seen corresponding path program 1 times [2021-11-02 22:36:03,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:03,135 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537153436] [2021-11-02 22:36:03,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:03,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:03,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:03,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:03,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:03,486 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:03,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:03,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:03,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:03,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:03,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:03,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:03,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:04,006 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:04,006 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:04,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537153436] [2021-11-02 22:36:04,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537153436] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:04,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805211695] [2021-11-02 22:36:04,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:04,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:04,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:04,014 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:04,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:36:04,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:04,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-02 22:36:04,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:04,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:36:04,934 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 15 treesize of output 11 [2021-11-02 22:36:05,068 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-02 22:36:05,068 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 37 treesize of output 28 [2021-11-02 22:36:05,843 INFO L354 Elim1Store]: treesize reduction 42, result has 38.2 percent of original size [2021-11-02 22:36:05,844 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 57 treesize of output 69 [2021-11-02 22:36:06,635 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-02 22:36:06,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 40 [2021-11-02 22:36:06,711 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:06,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805211695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:06,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:06,711 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 19] total 42 [2021-11-02 22:36:06,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269905553] [2021-11-02 22:36:06,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-02 22:36:06,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:06,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-02 22:36:06,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1681, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:36:06,714 INFO L87 Difference]: Start difference. First operand 1630 states and 2297 transitions. Second operand has 43 states, 38 states have (on average 3.1578947368421053) internal successors, (120), 35 states have internal predecessors, (120), 11 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-02 22:36:13,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:13,767 INFO L93 Difference]: Finished difference Result 2092 states and 2910 transitions. [2021-11-02 22:36:13,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-02 22:36:13,768 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 38 states have (on average 3.1578947368421053) internal successors, (120), 35 states have internal predecessors, (120), 11 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 73 [2021-11-02 22:36:13,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:13,773 INFO L225 Difference]: With dead ends: 2092 [2021-11-02 22:36:13,773 INFO L226 Difference]: Without dead ends: 2092 [2021-11-02 22:36:13,776 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1520 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=753, Invalid=6387, Unknown=0, NotChecked=0, Total=7140 [2021-11-02 22:36:13,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2092 states. [2021-11-02 22:36:13,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2092 to 1672. [2021-11-02 22:36:13,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1376 states have (on average 1.333575581395349) internal successors, (1835), 1431 states have internal predecessors, (1835), 165 states have call successors, (165), 79 states have call predecessors, (165), 99 states have return successors, (367), 161 states have call predecessors, (367), 164 states have call successors, (367) [2021-11-02 22:36:13,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 2367 transitions. [2021-11-02 22:36:13,816 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 2367 transitions. Word has length 73 [2021-11-02 22:36:13,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:13,817 INFO L470 AbstractCegarLoop]: Abstraction has 1672 states and 2367 transitions. [2021-11-02 22:36:13,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 38 states have (on average 3.1578947368421053) internal successors, (120), 35 states have internal predecessors, (120), 11 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-02 22:36:13,817 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 2367 transitions. [2021-11-02 22:36:13,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-02 22:36:13,818 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:13,819 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:13,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:14,042 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:14,042 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting create_itemErr5REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:14,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:14,042 INFO L85 PathProgramCache]: Analyzing trace with hash 593208647, now seen corresponding path program 1 times [2021-11-02 22:36:14,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:14,043 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823624312] [2021-11-02 22:36:14,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:14,043 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:14,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:14,528 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:14,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:14,537 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:14,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:14,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:14,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:14,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:14,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:15,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:15,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:15,179 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:15,179 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:15,179 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823624312] [2021-11-02 22:36:15,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823624312] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:15,180 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735502943] [2021-11-02 22:36:15,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:15,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:15,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:15,182 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:15,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:36:15,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:15,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-02 22:36:15,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:15,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:36:15,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:36:16,317 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 15 treesize of output 11 [2021-11-02 22:36:16,331 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 15 treesize of output 11 [2021-11-02 22:36:16,553 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-02 22:36:16,553 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 35 treesize of output 26 [2021-11-02 22:36:16,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:36:16,562 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 50 treesize of output 33 [2021-11-02 22:36:17,547 INFO L354 Elim1Store]: treesize reduction 4, result has 75.0 percent of original size [2021-11-02 22:36:17,548 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 100 treesize of output 100 [2021-11-02 22:36:17,561 INFO L354 Elim1Store]: treesize reduction 39, result has 25.0 percent of original size [2021-11-02 22:36:17,561 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 94 treesize of output 96 [2021-11-02 22:36:18,514 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-02 22:36:18,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 110 treesize of output 77 [2021-11-02 22:36:18,527 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-02 22:36:18,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 68 treesize of output 43 [2021-11-02 22:36:18,605 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:18,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735502943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:18,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:18,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20] total 44 [2021-11-02 22:36:18,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994183627] [2021-11-02 22:36:18,606 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-02 22:36:18,606 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:18,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-02 22:36:18,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1848, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:36:18,608 INFO L87 Difference]: Start difference. First operand 1672 states and 2367 transitions. Second operand has 45 states, 40 states have (on average 3.0) internal successors, (120), 37 states have internal predecessors, (120), 11 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-02 22:36:30,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:30,306 INFO L93 Difference]: Finished difference Result 2110 states and 2931 transitions. [2021-11-02 22:36:30,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-02 22:36:30,310 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 40 states have (on average 3.0) internal successors, (120), 37 states have internal predecessors, (120), 11 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) Word has length 73 [2021-11-02 22:36:30,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:30,315 INFO L225 Difference]: With dead ends: 2110 [2021-11-02 22:36:30,316 INFO L226 Difference]: Without dead ends: 2110 [2021-11-02 22:36:30,318 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1386 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=692, Invalid=6114, Unknown=0, NotChecked=0, Total=6806 [2021-11-02 22:36:30,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2110 states. [2021-11-02 22:36:30,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2110 to 1672. [2021-11-02 22:36:30,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1376 states have (on average 1.3313953488372092) internal successors, (1832), 1431 states have internal predecessors, (1832), 165 states have call successors, (165), 79 states have call predecessors, (165), 99 states have return successors, (367), 161 states have call predecessors, (367), 164 states have call successors, (367) [2021-11-02 22:36:30,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 2364 transitions. [2021-11-02 22:36:30,358 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 2364 transitions. Word has length 73 [2021-11-02 22:36:30,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:30,359 INFO L470 AbstractCegarLoop]: Abstraction has 1672 states and 2364 transitions. [2021-11-02 22:36:30,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 40 states have (on average 3.0) internal successors, (120), 37 states have internal predecessors, (120), 11 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (10), 8 states have call predecessors, (10), 7 states have call successors, (10) [2021-11-02 22:36:30,359 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 2364 transitions. [2021-11-02 22:36:30,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-02 22:36:30,361 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:30,361 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:30,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:30,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-02 22:36:30,574 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting is_emptyErr4ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:30,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:30,574 INFO L85 PathProgramCache]: Analyzing trace with hash -1917245456, now seen corresponding path program 1 times [2021-11-02 22:36:30,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:30,575 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135287519] [2021-11-02 22:36:30,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:30,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:30,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:30,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:30,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:30,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:30,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:30,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:30,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:30,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:30,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:30,710 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:36:30,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:30,713 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:36:30,713 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:30,713 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135287519] [2021-11-02 22:36:30,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135287519] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:30,713 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:36:30,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:36:30,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980578428] [2021-11-02 22:36:30,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:36:30,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:30,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:36:30,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:36:30,715 INFO L87 Difference]: Start difference. First operand 1672 states and 2364 transitions. Second operand has 10 states, 8 states have (on average 7.0) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 22:36:31,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:31,394 INFO L93 Difference]: Finished difference Result 1725 states and 2428 transitions. [2021-11-02 22:36:31,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:36:31,395 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 7.0) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 73 [2021-11-02 22:36:31,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:31,399 INFO L225 Difference]: With dead ends: 1725 [2021-11-02 22:36:31,400 INFO L226 Difference]: Without dead ends: 1725 [2021-11-02 22:36:31,400 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=312, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:36:31,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1725 states. [2021-11-02 22:36:31,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1725 to 1671. [2021-11-02 22:36:31,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1671 states, 1376 states have (on average 1.3284883720930232) internal successors, (1828), 1430 states have internal predecessors, (1828), 165 states have call successors, (165), 79 states have call predecessors, (165), 99 states have return successors, (367), 161 states have call predecessors, (367), 164 states have call successors, (367) [2021-11-02 22:36:31,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1671 states to 1671 states and 2360 transitions. [2021-11-02 22:36:31,439 INFO L78 Accepts]: Start accepts. Automaton has 1671 states and 2360 transitions. Word has length 73 [2021-11-02 22:36:31,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:31,439 INFO L470 AbstractCegarLoop]: Abstraction has 1671 states and 2360 transitions. [2021-11-02 22:36:31,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 7.0) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 22:36:31,440 INFO L276 IsEmpty]: Start isEmpty. Operand 1671 states and 2360 transitions. [2021-11-02 22:36:31,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-02 22:36:31,441 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:31,441 INFO L513 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:31,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2021-11-02 22:36:31,441 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:31,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:31,442 INFO L85 PathProgramCache]: Analyzing trace with hash -2082642812, now seen corresponding path program 3 times [2021-11-02 22:36:31,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:31,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958429992] [2021-11-02 22:36:31,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:31,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:31,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:31,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:31,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:31,486 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:36:31,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:31,501 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:36:31,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:31,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:31,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:31,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:36:31,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:31,590 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:31,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:31,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958429992] [2021-11-02 22:36:31,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958429992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:31,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990497239] [2021-11-02 22:36:31,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:36:31,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:31,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:31,593 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:31,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:36:32,075 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:36:32,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:32,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:36:32,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:32,283 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 [2021-11-02 22:36:32,287 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 [2021-11-02 22:36:32,825 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 12 treesize of output 4 [2021-11-02 22:36:32,828 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-02 22:36:32,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:36:32,900 INFO L354 Elim1Store]: treesize reduction 2, result has 33.3 percent of original size [2021-11-02 22:36:32,901 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 36 treesize of output 1 [2021-11-02 22:36:32,931 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:36:32,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990497239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:32,932 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:32,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [13] total 23 [2021-11-02 22:36:32,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302183868] [2021-11-02 22:36:32,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:36:32,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:32,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:36:32,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:36:32,933 INFO L87 Difference]: Start difference. First operand 1671 states and 2360 transitions. Second operand has 12 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 4 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:36:33,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:33,641 INFO L93 Difference]: Finished difference Result 1417 states and 2007 transitions. [2021-11-02 22:36:33,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:36:33,646 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 4 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 71 [2021-11-02 22:36:33,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:33,650 INFO L225 Difference]: With dead ends: 1417 [2021-11-02 22:36:33,650 INFO L226 Difference]: Without dead ends: 1396 [2021-11-02 22:36:33,651 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=1145, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:36:33,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1396 states. [2021-11-02 22:36:33,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1396 to 1393. [2021-11-02 22:36:33,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1393 states, 1145 states have (on average 1.3397379912663756) internal successors, (1534), 1191 states have internal predecessors, (1534), 138 states have call successors, (138), 65 states have call predecessors, (138), 77 states have return successors, (310), 136 states have call predecessors, (310), 137 states have call successors, (310) [2021-11-02 22:36:33,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1393 states to 1393 states and 1982 transitions. [2021-11-02 22:36:33,682 INFO L78 Accepts]: Start accepts. Automaton has 1393 states and 1982 transitions. Word has length 71 [2021-11-02 22:36:33,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:33,683 INFO L470 AbstractCegarLoop]: Abstraction has 1393 states and 1982 transitions. [2021-11-02 22:36:33,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 4 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:36:33,683 INFO L276 IsEmpty]: Start isEmpty. Operand 1393 states and 1982 transitions. [2021-11-02 22:36:33,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-02 22:36:33,684 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:33,684 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:33,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:33,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-02 22:36:33,903 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting mainErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:33,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:33,903 INFO L85 PathProgramCache]: Analyzing trace with hash 1627403553, now seen corresponding path program 1 times [2021-11-02 22:36:33,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:33,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843998858] [2021-11-02 22:36:33,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:33,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:33,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,072 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:34,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:34,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:34,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:34,436 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:34,436 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843998858] [2021-11-02 22:36:34,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843998858] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:34,436 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:36:34,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-11-02 22:36:34,436 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201735609] [2021-11-02 22:36:34,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-02 22:36:34,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:34,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-02 22:36:34,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=304, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:36:34,437 INFO L87 Difference]: Start difference. First operand 1393 states and 1982 transitions. Second operand has 19 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 16 states have internal predecessors, (62), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:36:36,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:36,370 INFO L93 Difference]: Finished difference Result 1633 states and 2273 transitions. [2021-11-02 22:36:36,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:36:36,370 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 16 states have internal predecessors, (62), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 71 [2021-11-02 22:36:36,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:36,374 INFO L225 Difference]: With dead ends: 1633 [2021-11-02 22:36:36,374 INFO L226 Difference]: Without dead ends: 1633 [2021-11-02 22:36:36,374 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=212, Invalid=1510, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:36:36,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1633 states. [2021-11-02 22:36:36,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1633 to 1409. [2021-11-02 22:36:36,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1409 states, 1161 states have (on average 1.3402239448751077) internal successors, (1556), 1207 states have internal predecessors, (1556), 138 states have call successors, (138), 65 states have call predecessors, (138), 77 states have return successors, (310), 136 states have call predecessors, (310), 137 states have call successors, (310) [2021-11-02 22:36:36,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1409 states to 1409 states and 2004 transitions. [2021-11-02 22:36:36,409 INFO L78 Accepts]: Start accepts. Automaton has 1409 states and 2004 transitions. Word has length 71 [2021-11-02 22:36:36,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:36,409 INFO L470 AbstractCegarLoop]: Abstraction has 1409 states and 2004 transitions. [2021-11-02 22:36:36,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.6470588235294117) internal successors, (62), 16 states have internal predecessors, (62), 3 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:36:36,410 INFO L276 IsEmpty]: Start isEmpty. Operand 1409 states and 2004 transitions. [2021-11-02 22:36:36,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-02 22:36:36,411 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:36,411 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:36,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2021-11-02 22:36:36,412 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting mainErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:36,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:36,412 INFO L85 PathProgramCache]: Analyzing trace with hash 818056927, now seen corresponding path program 1 times [2021-11-02 22:36:36,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:36,412 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027777704] [2021-11-02 22:36:36,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:36,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:36,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:36,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:36,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:36,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:36,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:36,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:36,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:36,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:36,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:36,708 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:36,709 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:36,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027777704] [2021-11-02 22:36:36,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027777704] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:36,709 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:36:36,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-02 22:36:36,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385777832] [2021-11-02 22:36:36,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:36:36,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:36,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:36:36,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:36:36,712 INFO L87 Difference]: Start difference. First operand 1409 states and 2004 transitions. Second operand has 15 states, 13 states have (on average 4.769230769230769) internal successors, (62), 12 states have internal predecessors, (62), 2 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-02 22:36:38,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:38,252 INFO L93 Difference]: Finished difference Result 1698 states and 2379 transitions. [2021-11-02 22:36:38,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:36:38,254 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 4.769230769230769) internal successors, (62), 12 states have internal predecessors, (62), 2 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 71 [2021-11-02 22:36:38,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:38,258 INFO L225 Difference]: With dead ends: 1698 [2021-11-02 22:36:38,258 INFO L226 Difference]: Without dead ends: 1698 [2021-11-02 22:36:38,259 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:36:38,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1698 states. [2021-11-02 22:36:38,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1698 to 1394. [2021-11-02 22:36:38,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1394 states, 1146 states have (on average 1.3394415357766143) internal successors, (1535), 1192 states have internal predecessors, (1535), 138 states have call successors, (138), 65 states have call predecessors, (138), 77 states have return successors, (310), 136 states have call predecessors, (310), 137 states have call successors, (310) [2021-11-02 22:36:38,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1394 states to 1394 states and 1983 transitions. [2021-11-02 22:36:38,290 INFO L78 Accepts]: Start accepts. Automaton has 1394 states and 1983 transitions. Word has length 71 [2021-11-02 22:36:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:38,290 INFO L470 AbstractCegarLoop]: Abstraction has 1394 states and 1983 transitions. [2021-11-02 22:36:38,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 4.769230769230769) internal successors, (62), 12 states have internal predecessors, (62), 2 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-02 22:36:38,291 INFO L276 IsEmpty]: Start isEmpty. Operand 1394 states and 1983 transitions. [2021-11-02 22:36:38,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-02 22:36:38,292 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:38,292 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:38,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2021-11-02 22:36:38,292 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting is_emptyErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:38,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:38,293 INFO L85 PathProgramCache]: Analyzing trace with hash 694933164, now seen corresponding path program 1 times [2021-11-02 22:36:38,293 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:38,293 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529027925] [2021-11-02 22:36:38,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:38,294 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:38,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:38,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:38,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:38,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:38,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:38,716 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:38,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:38,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:38,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:39,066 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:36:39,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:39,070 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:36:39,070 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:39,070 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529027925] [2021-11-02 22:36:39,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529027925] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:39,070 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:36:39,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2021-11-02 22:36:39,071 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031272025] [2021-11-02 22:36:39,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:36:39,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:39,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:36:39,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=458, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:36:39,072 INFO L87 Difference]: Start difference. First operand 1394 states and 1983 transitions. Second operand has 23 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 18 states have internal predecessors, (59), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:36:41,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:41,688 INFO L93 Difference]: Finished difference Result 1540 states and 2153 transitions. [2021-11-02 22:36:41,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:36:41,690 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 18 states have internal predecessors, (59), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 74 [2021-11-02 22:36:41,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:41,692 INFO L225 Difference]: With dead ends: 1540 [2021-11-02 22:36:41,693 INFO L226 Difference]: Without dead ends: 1539 [2021-11-02 22:36:41,693 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 375 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=307, Invalid=2045, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:36:41,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1539 states. [2021-11-02 22:36:41,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1539 to 1335. [2021-11-02 22:36:41,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1335 states, 1098 states have (on average 1.337887067395264) internal successors, (1469), 1143 states have internal predecessors, (1469), 132 states have call successors, (132), 62 states have call predecessors, (132), 72 states have return successors, (282), 129 states have call predecessors, (282), 131 states have call successors, (282) [2021-11-02 22:36:41,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1335 states to 1335 states and 1883 transitions. [2021-11-02 22:36:41,741 INFO L78 Accepts]: Start accepts. Automaton has 1335 states and 1883 transitions. Word has length 74 [2021-11-02 22:36:41,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:41,741 INFO L470 AbstractCegarLoop]: Abstraction has 1335 states and 1883 transitions. [2021-11-02 22:36:41,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 18 states have internal predecessors, (59), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:36:41,742 INFO L276 IsEmpty]: Start isEmpty. Operand 1335 states and 1883 transitions. [2021-11-02 22:36:41,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-02 22:36:41,743 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:41,743 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:41,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2021-11-02 22:36:41,743 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting create_itemErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:41,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:41,744 INFO L85 PathProgramCache]: Analyzing trace with hash -1240426773, now seen corresponding path program 1 times [2021-11-02 22:36:41,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:41,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537783177] [2021-11-02 22:36:41,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:41,745 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:41,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:41,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:41,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:41,802 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:41,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:41,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:41,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:41,822 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:41,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:41,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:41,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:41,832 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:36:41,832 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:41,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537783177] [2021-11-02 22:36:41,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537783177] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:41,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [987555859] [2021-11-02 22:36:41,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:41,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:41,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:41,838 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:41,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:36:42,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:42,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-02 22:36:42,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:42,760 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-02 22:36:42,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [987555859] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:42,761 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:42,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 5 [2021-11-02 22:36:42,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889822879] [2021-11-02 22:36:42,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:36:42,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:42,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:36:42,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:36:42,764 INFO L87 Difference]: Start difference. First operand 1335 states and 1883 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:42,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:42,774 INFO L93 Difference]: Finished difference Result 1335 states and 1879 transitions. [2021-11-02 22:36:42,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:36:42,775 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 76 [2021-11-02 22:36:42,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:42,778 INFO L225 Difference]: With dead ends: 1335 [2021-11-02 22:36:42,778 INFO L226 Difference]: Without dead ends: 1335 [2021-11-02 22:36:42,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:36:42,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1335 states. [2021-11-02 22:36:42,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1335 to 1334. [2021-11-02 22:36:42,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1334 states, 1097 states have (on average 1.3345487693710119) internal successors, (1464), 1142 states have internal predecessors, (1464), 132 states have call successors, (132), 62 states have call predecessors, (132), 72 states have return successors, (282), 129 states have call predecessors, (282), 131 states have call successors, (282) [2021-11-02 22:36:42,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1334 states to 1334 states and 1878 transitions. [2021-11-02 22:36:42,806 INFO L78 Accepts]: Start accepts. Automaton has 1334 states and 1878 transitions. Word has length 76 [2021-11-02 22:36:42,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:42,806 INFO L470 AbstractCegarLoop]: Abstraction has 1334 states and 1878 transitions. [2021-11-02 22:36:42,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:42,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1334 states and 1878 transitions. [2021-11-02 22:36:42,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-02 22:36:42,807 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:42,808 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:42,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:43,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-02 22:36:43,030 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:43,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:43,030 INFO L85 PathProgramCache]: Analyzing trace with hash 388683926, now seen corresponding path program 1 times [2021-11-02 22:36:43,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:43,030 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585237593] [2021-11-02 22:36:43,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:43,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:43,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:43,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:43,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:43,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,120 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:43,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,127 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:43,128 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:43,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585237593] [2021-11-02 22:36:43,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585237593] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:43,129 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098950479] [2021-11-02 22:36:43,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:43,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:43,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:43,130 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:43,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:36:43,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:36:43,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:43,992 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:43,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098950479] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:43,992 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:43,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 7 [2021-11-02 22:36:43,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337302861] [2021-11-02 22:36:43,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:36:43,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:43,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:36:43,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:36:43,994 INFO L87 Difference]: Start difference. First operand 1334 states and 1878 transitions. Second operand has 7 states, 7 states have (on average 11.0) internal successors, (77), 5 states have internal predecessors, (77), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-02 22:36:44,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:44,465 INFO L93 Difference]: Finished difference Result 2492 states and 3777 transitions. [2021-11-02 22:36:44,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:36:44,466 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 5 states have internal predecessors, (77), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 74 [2021-11-02 22:36:44,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:44,473 INFO L225 Difference]: With dead ends: 2492 [2021-11-02 22:36:44,473 INFO L226 Difference]: Without dead ends: 2492 [2021-11-02 22:36:44,474 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:36:44,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2492 states. [2021-11-02 22:36:44,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2492 to 1961. [2021-11-02 22:36:44,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1961 states, 1624 states have (on average 1.333743842364532) internal successors, (2166), 1669 states have internal predecessors, (2166), 232 states have call successors, (232), 62 states have call predecessors, (232), 72 states have return successors, (520), 229 states have call predecessors, (520), 231 states have call successors, (520) [2021-11-02 22:36:44,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1961 states to 1961 states and 2918 transitions. [2021-11-02 22:36:44,528 INFO L78 Accepts]: Start accepts. Automaton has 1961 states and 2918 transitions. Word has length 74 [2021-11-02 22:36:44,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:44,529 INFO L470 AbstractCegarLoop]: Abstraction has 1961 states and 2918 transitions. [2021-11-02 22:36:44,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 5 states have internal predecessors, (77), 3 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-02 22:36:44,529 INFO L276 IsEmpty]: Start isEmpty. Operand 1961 states and 2918 transitions. [2021-11-02 22:36:44,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-02 22:36:44,530 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:44,530 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:44,573 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:44,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-02 22:36:44,758 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:44,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:44,758 INFO L85 PathProgramCache]: Analyzing trace with hash -835701480, now seen corresponding path program 1 times [2021-11-02 22:36:44,758 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:44,758 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330130990] [2021-11-02 22:36:44,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:44,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:44,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:44,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:44,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:44,975 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:44,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:44,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:45,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:45,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:45,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:45,401 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:45,401 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:45,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330130990] [2021-11-02 22:36:45,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330130990] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:45,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163856020] [2021-11-02 22:36:45,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:45,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:45,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:45,402 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:45,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:36:45,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:45,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-02 22:36:45,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:46,532 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 15 treesize of output 11 [2021-11-02 22:36:46,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:36:46,633 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 51 treesize of output 34 [2021-11-02 22:36:46,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:36:46,971 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:36:46,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 48 treesize of output 18 [2021-11-02 22:36:47,137 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:47,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163856020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:47,138 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:47,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 35 [2021-11-02 22:36:47,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414065942] [2021-11-02 22:36:47,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 22:36:47,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:47,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 22:36:47,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1142, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:36:47,139 INFO L87 Difference]: Start difference. First operand 1961 states and 2918 transitions. Second operand has 36 states, 33 states have (on average 4.0) internal successors, (132), 32 states have internal predecessors, (132), 7 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 22:36:49,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:49,436 INFO L93 Difference]: Finished difference Result 2075 states and 3064 transitions. [2021-11-02 22:36:49,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:36:49,437 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 4.0) internal successors, (132), 32 states have internal predecessors, (132), 7 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 5 states have call successors, (8) Word has length 75 [2021-11-02 22:36:49,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:49,444 INFO L225 Difference]: With dead ends: 2075 [2021-11-02 22:36:49,444 INFO L226 Difference]: Without dead ends: 2054 [2021-11-02 22:36:49,444 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=281, Invalid=2371, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:36:49,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2054 states. [2021-11-02 22:36:49,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2054 to 1972. [2021-11-02 22:36:49,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1972 states, 1635 states have (on average 1.3339449541284403) internal successors, (2181), 1679 states have internal predecessors, (2181), 232 states have call successors, (232), 62 states have call predecessors, (232), 72 states have return successors, (520), 230 states have call predecessors, (520), 231 states have call successors, (520) [2021-11-02 22:36:49,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1972 states to 1972 states and 2933 transitions. [2021-11-02 22:36:49,491 INFO L78 Accepts]: Start accepts. Automaton has 1972 states and 2933 transitions. Word has length 75 [2021-11-02 22:36:49,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:49,491 INFO L470 AbstractCegarLoop]: Abstraction has 1972 states and 2933 transitions. [2021-11-02 22:36:49,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 4.0) internal successors, (132), 32 states have internal predecessors, (132), 7 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 22:36:49,492 INFO L276 IsEmpty]: Start isEmpty. Operand 1972 states and 2933 transitions. [2021-11-02 22:36:49,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-02 22:36:49,493 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:49,493 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:49,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:49,713 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-02 22:36:49,714 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting create_itemErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:49,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:49,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1606894091, now seen corresponding path program 1 times [2021-11-02 22:36:49,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:49,714 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529661184] [2021-11-02 22:36:49,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:49,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:49,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:49,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:49,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:49,774 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:49,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:49,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:49,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:49,802 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:49,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:49,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:49,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:49,811 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-02 22:36:49,812 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:49,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529661184] [2021-11-02 22:36:49,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529661184] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:49,812 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471236694] [2021-11-02 22:36:49,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:49,812 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:49,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:49,814 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:49,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:36:50,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:50,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-02 22:36:50,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:50,715 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-02 22:36:50,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471236694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:50,716 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:50,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-02 22:36:50,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643866320] [2021-11-02 22:36:50,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:36:50,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:50,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:36:50,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:36:50,717 INFO L87 Difference]: Start difference. First operand 1972 states and 2933 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:50,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:50,728 INFO L93 Difference]: Finished difference Result 2178 states and 3206 transitions. [2021-11-02 22:36:50,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:36:50,729 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 79 [2021-11-02 22:36:50,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:50,734 INFO L225 Difference]: With dead ends: 2178 [2021-11-02 22:36:50,734 INFO L226 Difference]: Without dead ends: 2178 [2021-11-02 22:36:50,735 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:36:50,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2178 states. [2021-11-02 22:36:50,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2178 to 1994. [2021-11-02 22:36:50,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1657 states have (on average 1.3391671695835847) internal successors, (2219), 1701 states have internal predecessors, (2219), 232 states have call successors, (232), 62 states have call predecessors, (232), 72 states have return successors, (520), 230 states have call predecessors, (520), 231 states have call successors, (520) [2021-11-02 22:36:50,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 2971 transitions. [2021-11-02 22:36:50,806 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 2971 transitions. Word has length 79 [2021-11-02 22:36:50,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:50,806 INFO L470 AbstractCegarLoop]: Abstraction has 1994 states and 2971 transitions. [2021-11-02 22:36:50,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:50,806 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 2971 transitions. [2021-11-02 22:36:50,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-02 22:36:50,807 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:50,808 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:50,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:51,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-02 22:36:51,022 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting create_itemErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:51,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:51,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1606894029, now seen corresponding path program 1 times [2021-11-02 22:36:51,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:51,023 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325057469] [2021-11-02 22:36:51,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:51,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:51,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:51,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:51,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:51,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:51,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:51,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:51,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:51,122 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:51,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:51,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:51,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:51,138 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:36:51,138 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:51,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325057469] [2021-11-02 22:36:51,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325057469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:51,138 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367502155] [2021-11-02 22:36:51,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:51,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:51,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:51,140 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:51,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:36:52,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:36:52,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:52,233 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 17 treesize of output 9 [2021-11-02 22:36:52,242 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-02 22:36:52,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367502155] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:52,242 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:52,242 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 7 [2021-11-02 22:36:52,243 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601752755] [2021-11-02 22:36:52,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:36:52,243 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:52,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:36:52,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:36:52,244 INFO L87 Difference]: Start difference. First operand 1994 states and 2971 transitions. Second operand has 6 states, 5 states have (on average 10.4) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:52,425 INFO L93 Difference]: Finished difference Result 1996 states and 2968 transitions. [2021-11-02 22:36:52,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:36:52,425 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.4) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 79 [2021-11-02 22:36:52,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:52,431 INFO L225 Difference]: With dead ends: 1996 [2021-11-02 22:36:52,432 INFO L226 Difference]: Without dead ends: 1996 [2021-11-02 22:36:52,432 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:36:52,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1996 states. [2021-11-02 22:36:52,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1996 to 1994. [2021-11-02 22:36:52,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1994 states, 1657 states have (on average 1.3373566686783342) internal successors, (2216), 1701 states have internal predecessors, (2216), 232 states have call successors, (232), 62 states have call predecessors, (232), 72 states have return successors, (520), 230 states have call predecessors, (520), 231 states have call successors, (520) [2021-11-02 22:36:52,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1994 states to 1994 states and 2968 transitions. [2021-11-02 22:36:52,479 INFO L78 Accepts]: Start accepts. Automaton has 1994 states and 2968 transitions. Word has length 79 [2021-11-02 22:36:52,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:52,479 INFO L470 AbstractCegarLoop]: Abstraction has 1994 states and 2968 transitions. [2021-11-02 22:36:52,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.4) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:52,479 INFO L276 IsEmpty]: Start isEmpty. Operand 1994 states and 2968 transitions. [2021-11-02 22:36:52,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-02 22:36:52,480 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:52,481 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:52,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:52,706 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:52,706 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:52,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:52,706 INFO L85 PathProgramCache]: Analyzing trace with hash -1606894028, now seen corresponding path program 1 times [2021-11-02 22:36:52,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:52,706 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993922070] [2021-11-02 22:36:52,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:52,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:52,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:52,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:52,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:52,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:52,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,873 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:52,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:52,875 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:36:52,876 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:52,876 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993922070] [2021-11-02 22:36:52,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993922070] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:52,876 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656758561] [2021-11-02 22:36:52,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:52,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:52,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:52,890 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:52,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:36:53,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:53,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-02 22:36:53,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:54,022 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 44 treesize of output 32 [2021-11-02 22:36:54,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-02 22:36:54,041 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-02 22:36:54,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656758561] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:54,042 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:54,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 7 [2021-11-02 22:36:54,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131625368] [2021-11-02 22:36:54,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:36:54,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:54,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:36:54,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:36:54,044 INFO L87 Difference]: Start difference. First operand 1994 states and 2968 transitions. Second operand has 6 states, 5 states have (on average 10.4) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:54,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:54,229 INFO L93 Difference]: Finished difference Result 1990 states and 2944 transitions. [2021-11-02 22:36:54,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:36:54,229 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.4) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 79 [2021-11-02 22:36:54,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:54,234 INFO L225 Difference]: With dead ends: 1990 [2021-11-02 22:36:54,234 INFO L226 Difference]: Without dead ends: 1990 [2021-11-02 22:36:54,234 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:36:54,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1990 states. [2021-11-02 22:36:54,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1990 to 1981. [2021-11-02 22:36:54,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1981 states, 1648 states have (on average 1.3216019417475728) internal successors, (2178), 1688 states have internal predecessors, (2178), 232 states have call successors, (232), 62 states have call predecessors, (232), 72 states have return successors, (520), 230 states have call predecessors, (520), 231 states have call successors, (520) [2021-11-02 22:36:54,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1981 states to 1981 states and 2930 transitions. [2021-11-02 22:36:54,278 INFO L78 Accepts]: Start accepts. Automaton has 1981 states and 2930 transitions. Word has length 79 [2021-11-02 22:36:54,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:54,278 INFO L470 AbstractCegarLoop]: Abstraction has 1981 states and 2930 transitions. [2021-11-02 22:36:54,279 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.4) internal successors, (52), 6 states have internal predecessors, (52), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:54,279 INFO L276 IsEmpty]: Start isEmpty. Operand 1981 states and 2930 transitions. [2021-11-02 22:36:54,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-02 22:36:54,280 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:54,280 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:54,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:54,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-02 22:36:54,494 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting create_itemErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:54,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:54,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1681037716, now seen corresponding path program 1 times [2021-11-02 22:36:54,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:54,494 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90132385] [2021-11-02 22:36:54,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:54,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:54,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:54,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:54,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:54,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:54,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:54,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:54,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:54,600 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:54,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:54,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:54,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:54,609 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:36:54,610 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:54,610 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90132385] [2021-11-02 22:36:54,610 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90132385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:54,610 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645141130] [2021-11-02 22:36:54,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:54,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:54,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:54,614 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:54,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:36:55,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:55,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:36:55,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:55,478 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 17 treesize of output 9 [2021-11-02 22:36:55,488 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-02 22:36:55,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645141130] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:36:55,488 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:36:55,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 7 [2021-11-02 22:36:55,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232195768] [2021-11-02 22:36:55,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:36:55,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:55,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:36:55,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:36:55,490 INFO L87 Difference]: Start difference. First operand 1981 states and 2930 transitions. Second operand has 6 states, 5 states have (on average 10.6) internal successors, (53), 6 states have internal predecessors, (53), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:55,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:55,639 INFO L93 Difference]: Finished difference Result 2015 states and 2964 transitions. [2021-11-02 22:36:55,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:36:55,646 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.6) internal successors, (53), 6 states have internal predecessors, (53), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 80 [2021-11-02 22:36:55,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:55,652 INFO L225 Difference]: With dead ends: 2015 [2021-11-02 22:36:55,652 INFO L226 Difference]: Without dead ends: 2015 [2021-11-02 22:36:55,652 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:36:55,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2015 states. [2021-11-02 22:36:55,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2015 to 1975. [2021-11-02 22:36:55,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1644 states have (on average 1.3181265206812651) internal successors, (2167), 1682 states have internal predecessors, (2167), 232 states have call successors, (232), 62 states have call predecessors, (232), 72 states have return successors, (520), 230 states have call predecessors, (520), 231 states have call successors, (520) [2021-11-02 22:36:55,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2919 transitions. [2021-11-02 22:36:55,725 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2919 transitions. Word has length 80 [2021-11-02 22:36:55,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:55,725 INFO L470 AbstractCegarLoop]: Abstraction has 1975 states and 2919 transitions. [2021-11-02 22:36:55,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.6) internal successors, (53), 6 states have internal predecessors, (53), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-02 22:36:55,726 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2919 transitions. [2021-11-02 22:36:55,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-02 22:36:55,728 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:55,728 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:55,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:55,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-02 22:36:55,938 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting create_itemErr13REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:36:55,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:55,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1681037717, now seen corresponding path program 1 times [2021-11-02 22:36:55,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:55,939 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464885827] [2021-11-02 22:36:55,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:55,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:55,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:56,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:56,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:36:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:56,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:36:56,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:56,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:36:56,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:56,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:56,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:56,870 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:56,871 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:56,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464885827] [2021-11-02 22:36:56,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464885827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:56,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043566743] [2021-11-02 22:36:56,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:56,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:56,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:56,873 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:56,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:36:57,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:57,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-02 22:36:57,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:58,071 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 15 treesize of output 11 [2021-11-02 22:36:58,177 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-02 22:36:58,177 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 35 treesize of output 26 [2021-11-02 22:36:59,102 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 91 treesize of output 71 [2021-11-02 22:36:59,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:36:59,116 INFO L354 Elim1Store]: treesize reduction 30, result has 9.1 percent of original size [2021-11-02 22:36:59,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 68 treesize of output 39 [2021-11-02 22:36:59,249 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:59,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043566743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:59,249 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:59,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 49 [2021-11-02 22:36:59,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629472017] [2021-11-02 22:36:59,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-02 22:36:59,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:59,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-02 22:36:59,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=2287, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:36:59,251 INFO L87 Difference]: Start difference. First operand 1975 states and 2919 transitions. Second operand has 50 states, 45 states have (on average 2.8) internal successors, (126), 42 states have internal predecessors, (126), 11 states have call successors, (15), 9 states have call predecessors, (15), 9 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-02 22:37:04,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:04,400 INFO L93 Difference]: Finished difference Result 2575 states and 3640 transitions. [2021-11-02 22:37:04,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-02 22:37:04,401 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 45 states have (on average 2.8) internal successors, (126), 42 states have internal predecessors, (126), 11 states have call successors, (15), 9 states have call predecessors, (15), 9 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) Word has length 80 [2021-11-02 22:37:04,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:04,407 INFO L225 Difference]: With dead ends: 2575 [2021-11-02 22:37:04,408 INFO L226 Difference]: Without dead ends: 2575 [2021-11-02 22:37:04,409 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2956 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=916, Invalid=9386, Unknown=0, NotChecked=0, Total=10302 [2021-11-02 22:37:04,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2575 states. [2021-11-02 22:37:04,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2575 to 2099. [2021-11-02 22:37:04,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2099 states, 1758 states have (on average 1.3088737201365188) internal successors, (2301), 1798 states have internal predecessors, (2301), 238 states have call successors, (238), 66 states have call predecessors, (238), 76 states have return successors, (543), 234 states have call predecessors, (543), 237 states have call successors, (543) [2021-11-02 22:37:04,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2099 states to 2099 states and 3082 transitions. [2021-11-02 22:37:04,462 INFO L78 Accepts]: Start accepts. Automaton has 2099 states and 3082 transitions. Word has length 80 [2021-11-02 22:37:04,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:04,463 INFO L470 AbstractCegarLoop]: Abstraction has 2099 states and 3082 transitions. [2021-11-02 22:37:04,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 45 states have (on average 2.8) internal successors, (126), 42 states have internal predecessors, (126), 11 states have call successors, (15), 9 states have call predecessors, (15), 9 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-02 22:37:04,463 INFO L276 IsEmpty]: Start isEmpty. Operand 2099 states and 3082 transitions. [2021-11-02 22:37:04,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-02 22:37:04,464 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:04,464 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:04,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:04,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-11-02 22:37:04,678 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting remove_oneErr6ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:04,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:04,678 INFO L85 PathProgramCache]: Analyzing trace with hash 272212964, now seen corresponding path program 1 times [2021-11-02 22:37:04,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:04,678 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308352570] [2021-11-02 22:37:04,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:04,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:04,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:04,859 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:04,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:04,865 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:04,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:04,882 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:04,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:05,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:05,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:05,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:05,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:05,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-11-02 22:37:05,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:37:05,140 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:05,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308352570] [2021-11-02 22:37:05,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308352570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:37:05,140 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:37:05,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-11-02 22:37:05,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532543135] [2021-11-02 22:37:05,141 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:37:05,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:05,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:37:05,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=337, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:37:05,142 INFO L87 Difference]: Start difference. First operand 2099 states and 3082 transitions. Second operand has 20 states, 18 states have (on average 3.6666666666666665) internal successors, (66), 15 states have internal predecessors, (66), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:07,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:07,114 INFO L93 Difference]: Finished difference Result 2416 states and 3503 transitions. [2021-11-02 22:37:07,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-02 22:37:07,114 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.6666666666666665) internal successors, (66), 15 states have internal predecessors, (66), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 82 [2021-11-02 22:37:07,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:07,120 INFO L225 Difference]: With dead ends: 2416 [2021-11-02 22:37:07,120 INFO L226 Difference]: Without dead ends: 2416 [2021-11-02 22:37:07,120 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=329, Invalid=1927, Unknown=0, NotChecked=0, Total=2256 [2021-11-02 22:37:07,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2416 states. [2021-11-02 22:37:07,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2416 to 2110. [2021-11-02 22:37:07,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2110 states, 1769 states have (on average 1.3086489542114188) internal successors, (2315), 1809 states have internal predecessors, (2315), 238 states have call successors, (238), 66 states have call predecessors, (238), 76 states have return successors, (543), 234 states have call predecessors, (543), 237 states have call successors, (543) [2021-11-02 22:37:07,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2110 states to 2110 states and 3096 transitions. [2021-11-02 22:37:07,170 INFO L78 Accepts]: Start accepts. Automaton has 2110 states and 3096 transitions. Word has length 82 [2021-11-02 22:37:07,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:07,170 INFO L470 AbstractCegarLoop]: Abstraction has 2110 states and 3096 transitions. [2021-11-02 22:37:07,170 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.6666666666666665) internal successors, (66), 15 states have internal predecessors, (66), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:07,170 INFO L276 IsEmpty]: Start isEmpty. Operand 2110 states and 3096 transitions. [2021-11-02 22:37:07,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-02 22:37:07,172 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:07,172 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:07,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2021-11-02 22:37:07,172 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting create_itemErr4REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:07,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:07,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1022347257, now seen corresponding path program 1 times [2021-11-02 22:37:07,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:07,173 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711819667] [2021-11-02 22:37:07,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:07,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:07,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:08,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:08,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:08,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:08,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:08,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:08,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:09,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:37:09,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:09,377 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:37:09,378 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:09,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711819667] [2021-11-02 22:37:09,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711819667] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:09,378 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351910927] [2021-11-02 22:37:09,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:09,379 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:09,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:09,380 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:09,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:37:10,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:10,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-02 22:37:10,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:10,760 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 15 treesize of output 11 [2021-11-02 22:37:10,768 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 15 treesize of output 11 [2021-11-02 22:37:10,945 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-02 22:37:10,945 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 56 treesize of output 55 [2021-11-02 22:37:10,957 INFO L354 Elim1Store]: treesize reduction 37, result has 22.9 percent of original size [2021-11-02 22:37:10,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-02 22:37:11,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:11,059 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 31 treesize of output 15 [2021-11-02 22:37:11,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:11,070 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 31 treesize of output 15 [2021-11-02 22:37:11,215 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 22:37:11,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-02 22:37:11,235 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-02 22:37:11,235 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 37 treesize of output 46 [2021-11-02 22:37:12,112 INFO L354 Elim1Store]: treesize reduction 92, result has 18.6 percent of original size [2021-11-02 22:37:12,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 99 treesize of output 97 [2021-11-02 22:37:12,159 INFO L354 Elim1Store]: treesize reduction 48, result has 48.4 percent of original size [2021-11-02 22:37:12,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 91 treesize of output 108 [2021-11-02 22:37:12,639 INFO L354 Elim1Store]: treesize reduction 162, result has 16.5 percent of original size [2021-11-02 22:37:12,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 140 treesize of output 137 [2021-11-02 22:37:12,681 INFO L354 Elim1Store]: treesize reduction 114, result has 32.9 percent of original size [2021-11-02 22:37:12,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 144 treesize of output 156 [2021-11-02 22:37:14,414 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [create_item_~cursor.offset] [2021-11-02 22:37:14,414 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:37:14,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2021-11-02 22:37:14,415 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526891590] [2021-11-02 22:37:14,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 22:37:14,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:14,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 22:37:14,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2721, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:37:14,416 INFO L87 Difference]: Start difference. First operand 2110 states and 3096 transitions. Second operand has 34 states, 32 states have (on average 2.1875) internal successors, (70), 29 states have internal predecessors, (70), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:37:23,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:23,957 INFO L93 Difference]: Finished difference Result 3088 states and 4399 transitions. [2021-11-02 22:37:23,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-02 22:37:23,964 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 2.1875) internal successors, (70), 29 states have internal predecessors, (70), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 83 [2021-11-02 22:37:23,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:23,970 INFO L225 Difference]: With dead ends: 3088 [2021-11-02 22:37:23,970 INFO L226 Difference]: Without dead ends: 3088 [2021-11-02 22:37:23,973 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4594 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=927, Invalid=15329, Unknown=0, NotChecked=0, Total=16256 [2021-11-02 22:37:23,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3088 states. [2021-11-02 22:37:24,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3088 to 2557. [2021-11-02 22:37:24,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2557 states, 2151 states have (on average 1.306369130636913) internal successors, (2810), 2196 states have internal predecessors, (2810), 285 states have call successors, (285), 79 states have call predecessors, (285), 94 states have return successors, (673), 281 states have call predecessors, (673), 284 states have call successors, (673) [2021-11-02 22:37:24,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2557 states to 2557 states and 3768 transitions. [2021-11-02 22:37:24,033 INFO L78 Accepts]: Start accepts. Automaton has 2557 states and 3768 transitions. Word has length 83 [2021-11-02 22:37:24,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:24,034 INFO L470 AbstractCegarLoop]: Abstraction has 2557 states and 3768 transitions. [2021-11-02 22:37:24,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 2.1875) internal successors, (70), 29 states have internal predecessors, (70), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-02 22:37:24,034 INFO L276 IsEmpty]: Start isEmpty. Operand 2557 states and 3768 transitions. [2021-11-02 22:37:24,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-02 22:37:24,035 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:24,035 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:24,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:24,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:24,250 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting remove_oneErr7ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:24,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:24,250 INFO L85 PathProgramCache]: Analyzing trace with hash -151332610, now seen corresponding path program 1 times [2021-11-02 22:37:24,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:24,250 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629507818] [2021-11-02 22:37:24,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:24,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:24,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:24,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:24,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:24,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:24,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:24,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-11-02 22:37:24,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:24,694 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:37:24,694 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:24,694 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629507818] [2021-11-02 22:37:24,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629507818] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:37:24,695 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:37:24,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-11-02 22:37:24,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540463507] [2021-11-02 22:37:24,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:37:24,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:24,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:37:24,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=337, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:37:24,696 INFO L87 Difference]: Start difference. First operand 2557 states and 3768 transitions. Second operand has 20 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 15 states have internal predecessors, (67), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:26,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:26,457 INFO L93 Difference]: Finished difference Result 2928 states and 4285 transitions. [2021-11-02 22:37:26,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-02 22:37:26,458 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 15 states have internal predecessors, (67), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 83 [2021-11-02 22:37:26,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:26,464 INFO L225 Difference]: With dead ends: 2928 [2021-11-02 22:37:26,464 INFO L226 Difference]: Without dead ends: 2928 [2021-11-02 22:37:26,465 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=314, Invalid=1848, Unknown=0, NotChecked=0, Total=2162 [2021-11-02 22:37:26,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2928 states. [2021-11-02 22:37:26,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2928 to 2559. [2021-11-02 22:37:26,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2559 states, 2153 states have (on average 1.306084533209475) internal successors, (2812), 2198 states have internal predecessors, (2812), 285 states have call successors, (285), 79 states have call predecessors, (285), 94 states have return successors, (673), 281 states have call predecessors, (673), 284 states have call successors, (673) [2021-11-02 22:37:26,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2559 states to 2559 states and 3770 transitions. [2021-11-02 22:37:26,523 INFO L78 Accepts]: Start accepts. Automaton has 2559 states and 3770 transitions. Word has length 83 [2021-11-02 22:37:26,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:26,523 INFO L470 AbstractCegarLoop]: Abstraction has 2559 states and 3770 transitions. [2021-11-02 22:37:26,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.7222222222222223) internal successors, (67), 15 states have internal predecessors, (67), 5 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:26,523 INFO L276 IsEmpty]: Start isEmpty. Operand 2559 states and 3770 transitions. [2021-11-02 22:37:26,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-02 22:37:26,524 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:26,525 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:26,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2021-11-02 22:37:26,525 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting remove_oneErr8ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:26,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:26,526 INFO L85 PathProgramCache]: Analyzing trace with hash -396343514, now seen corresponding path program 1 times [2021-11-02 22:37:26,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:26,526 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513169231] [2021-11-02 22:37:26,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:26,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:26,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:26,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,714 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:26,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:26,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,868 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:26,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:26,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,941 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-11-02 22:37:26,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:26,956 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:37:26,956 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:26,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513169231] [2021-11-02 22:37:26,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513169231] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:37:26,957 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:37:26,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-11-02 22:37:26,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079457116] [2021-11-02 22:37:26,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:37:26,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:26,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:37:26,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=337, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:37:26,958 INFO L87 Difference]: Start difference. First operand 2559 states and 3770 transitions. Second operand has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 16 states have internal predecessors, (68), 5 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:28,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:28,857 INFO L93 Difference]: Finished difference Result 2910 states and 4264 transitions. [2021-11-02 22:37:28,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:37:28,857 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 16 states have internal predecessors, (68), 5 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 84 [2021-11-02 22:37:28,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:28,864 INFO L225 Difference]: With dead ends: 2910 [2021-11-02 22:37:28,864 INFO L226 Difference]: Without dead ends: 2910 [2021-11-02 22:37:28,865 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=243, Invalid=1317, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:37:28,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2910 states. [2021-11-02 22:37:28,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2910 to 2567. [2021-11-02 22:37:28,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2567 states, 2161 states have (on average 1.3054141601110596) internal successors, (2821), 2206 states have internal predecessors, (2821), 285 states have call successors, (285), 79 states have call predecessors, (285), 94 states have return successors, (673), 281 states have call predecessors, (673), 284 states have call successors, (673) [2021-11-02 22:37:28,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2567 states to 2567 states and 3779 transitions. [2021-11-02 22:37:28,938 INFO L78 Accepts]: Start accepts. Automaton has 2567 states and 3779 transitions. Word has length 84 [2021-11-02 22:37:28,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:28,938 INFO L470 AbstractCegarLoop]: Abstraction has 2567 states and 3779 transitions. [2021-11-02 22:37:28,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 3.7777777777777777) internal successors, (68), 16 states have internal predecessors, (68), 5 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:28,939 INFO L276 IsEmpty]: Start isEmpty. Operand 2567 states and 3779 transitions. [2021-11-02 22:37:28,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-02 22:37:28,940 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:28,940 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:28,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2021-11-02 22:37:28,940 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting remove_oneErr14REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:28,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:28,941 INFO L85 PathProgramCache]: Analyzing trace with hash -183532344, now seen corresponding path program 1 times [2021-11-02 22:37:28,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:28,941 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867859223] [2021-11-02 22:37:28,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:28,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:28,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:29,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:29,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:29,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:29,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:29,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-11-02 22:37:29,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:29,692 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:37:29,692 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:29,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867859223] [2021-11-02 22:37:29,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [867859223] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:37:29,693 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:37:29,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-02 22:37:29,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196547168] [2021-11-02 22:37:29,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:37:29,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:29,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:37:29,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:37:29,694 INFO L87 Difference]: Start difference. First operand 2567 states and 3779 transitions. Second operand has 15 states, 14 states have (on average 5.071428571428571) internal successors, (71), 11 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:31,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:31,208 INFO L93 Difference]: Finished difference Result 2837 states and 4108 transitions. [2021-11-02 22:37:31,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:37:31,208 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 5.071428571428571) internal successors, (71), 11 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 87 [2021-11-02 22:37:31,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:31,212 INFO L225 Difference]: With dead ends: 2837 [2021-11-02 22:37:31,212 INFO L226 Difference]: Without dead ends: 2837 [2021-11-02 22:37:31,212 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=190, Invalid=680, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:37:31,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2837 states. [2021-11-02 22:37:31,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2837 to 2573. [2021-11-02 22:37:31,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2573 states, 2167 states have (on average 1.3045685279187818) internal successors, (2827), 2212 states have internal predecessors, (2827), 285 states have call successors, (285), 79 states have call predecessors, (285), 94 states have return successors, (649), 281 states have call predecessors, (649), 284 states have call successors, (649) [2021-11-02 22:37:31,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2573 states to 2573 states and 3761 transitions. [2021-11-02 22:37:31,260 INFO L78 Accepts]: Start accepts. Automaton has 2573 states and 3761 transitions. Word has length 87 [2021-11-02 22:37:31,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:31,261 INFO L470 AbstractCegarLoop]: Abstraction has 2573 states and 3761 transitions. [2021-11-02 22:37:31,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 5.071428571428571) internal successors, (71), 11 states have internal predecessors, (71), 5 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-02 22:37:31,261 INFO L276 IsEmpty]: Start isEmpty. Operand 2573 states and 3761 transitions. [2021-11-02 22:37:31,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-02 22:37:31,263 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:31,263 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:31,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2021-11-02 22:37:31,263 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:31,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:31,264 INFO L85 PathProgramCache]: Analyzing trace with hash -18698915, now seen corresponding path program 1 times [2021-11-02 22:37:31,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:31,264 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830737467] [2021-11-02 22:37:31,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:31,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:31,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,345 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:31,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,350 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:31,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:31,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:31,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:31,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:37:31,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:31,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:31,848 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:37:31,848 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:31,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830737467] [2021-11-02 22:37:31,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830737467] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:37:31,849 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:37:31,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2021-11-02 22:37:31,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734156656] [2021-11-02 22:37:31,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:37:31,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:31,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:37:31,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=498, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:37:31,850 INFO L87 Difference]: Start difference. First operand 2573 states and 3761 transitions. Second operand has 24 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 19 states have internal predecessors, (78), 5 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-02 22:37:34,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:34,812 INFO L93 Difference]: Finished difference Result 2514 states and 3561 transitions. [2021-11-02 22:37:34,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-02 22:37:34,813 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 19 states have internal predecessors, (78), 5 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 95 [2021-11-02 22:37:34,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:34,818 INFO L225 Difference]: With dead ends: 2514 [2021-11-02 22:37:34,818 INFO L226 Difference]: Without dead ends: 2498 [2021-11-02 22:37:34,819 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=508, Invalid=3032, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:37:34,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2498 states. [2021-11-02 22:37:34,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2498 to 2127. [2021-11-02 22:37:34,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2127 states, 1797 states have (on average 1.2982749026154703) internal successors, (2333), 1844 states have internal predecessors, (2333), 218 states have call successors, (218), 77 states have call predecessors, (218), 85 states have return successors, (505), 205 states have call predecessors, (505), 217 states have call successors, (505) [2021-11-02 22:37:34,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2127 states to 2127 states and 3056 transitions. [2021-11-02 22:37:34,856 INFO L78 Accepts]: Start accepts. Automaton has 2127 states and 3056 transitions. Word has length 95 [2021-11-02 22:37:34,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:34,857 INFO L470 AbstractCegarLoop]: Abstraction has 2127 states and 3056 transitions. [2021-11-02 22:37:34,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 3.5454545454545454) internal successors, (78), 19 states have internal predecessors, (78), 5 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-02 22:37:34,857 INFO L276 IsEmpty]: Start isEmpty. Operand 2127 states and 3056 transitions. [2021-11-02 22:37:34,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-02 22:37:34,859 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:34,859 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:34,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2021-11-02 22:37:34,860 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:34,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:34,860 INFO L85 PathProgramCache]: Analyzing trace with hash 4365535, now seen corresponding path program 1 times [2021-11-02 22:37:34,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:34,860 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774883382] [2021-11-02 22:37:34,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:34,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:34,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:34,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:34,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:34,948 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:34,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:34,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:34,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:34,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:35,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:35,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:37:35,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:35,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-02 22:37:35,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:35,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:35,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:35,492 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 37 proven. 8 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:37:35,492 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:35,492 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774883382] [2021-11-02 22:37:35,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774883382] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:35,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717823792] [2021-11-02 22:37:35,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:35,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:35,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:35,498 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:35,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:37:36,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:36,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-02 22:37:36,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:36,709 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 5 treesize of output 3 [2021-11-02 22:37:36,987 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 15 treesize of output 11 [2021-11-02 22:37:36,994 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 15 treesize of output 11 [2021-11-02 22:37:37,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:37,057 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 31 treesize of output 15 [2021-11-02 22:37:37,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:37,070 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 31 treesize of output 15 [2021-11-02 22:37:37,182 INFO L354 Elim1Store]: treesize reduction 21, result has 47.5 percent of original size [2021-11-02 22:37:37,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 50 [2021-11-02 22:37:37,194 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 22:37:37,195 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 47 treesize of output 46 [2021-11-02 22:37:37,619 INFO L354 Elim1Store]: treesize reduction 29, result has 45.3 percent of original size [2021-11-02 22:37:37,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 95 treesize of output 79 [2021-11-02 22:37:37,628 INFO L354 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2021-11-02 22:37:37,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 70 treesize of output 54 [2021-11-02 22:37:37,789 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 27 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:37:37,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717823792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:37,789 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:37,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 36 [2021-11-02 22:37:37,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563848655] [2021-11-02 22:37:37,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 22:37:37,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:37,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 22:37:37,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1149, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:37:37,791 INFO L87 Difference]: Start difference. First operand 2127 states and 3056 transitions. Second operand has 36 states, 34 states have (on average 4.617647058823529) internal successors, (157), 31 states have internal predecessors, (157), 6 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-02 22:37:40,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:40,864 INFO L93 Difference]: Finished difference Result 2788 states and 3911 transitions. [2021-11-02 22:37:40,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-02 22:37:40,864 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 34 states have (on average 4.617647058823529) internal successors, (157), 31 states have internal predecessors, (157), 6 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) Word has length 109 [2021-11-02 22:37:40,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:40,867 INFO L225 Difference]: With dead ends: 2788 [2021-11-02 22:37:40,868 INFO L226 Difference]: Without dead ends: 2773 [2021-11-02 22:37:40,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1140 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=540, Invalid=4152, Unknown=0, NotChecked=0, Total=4692 [2021-11-02 22:37:40,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2773 states. [2021-11-02 22:37:40,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2773 to 2479. [2021-11-02 22:37:40,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2479 states, 2102 states have (on average 1.291151284490961) internal successors, (2714), 2159 states have internal predecessors, (2714), 244 states have call successors, (244), 85 states have call predecessors, (244), 106 states have return successors, (572), 234 states have call predecessors, (572), 243 states have call successors, (572) [2021-11-02 22:37:40,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2479 states to 2479 states and 3530 transitions. [2021-11-02 22:37:40,909 INFO L78 Accepts]: Start accepts. Automaton has 2479 states and 3530 transitions. Word has length 109 [2021-11-02 22:37:40,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:40,909 INFO L470 AbstractCegarLoop]: Abstraction has 2479 states and 3530 transitions. [2021-11-02 22:37:40,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 34 states have (on average 4.617647058823529) internal successors, (157), 31 states have internal predecessors, (157), 6 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (12), 8 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-02 22:37:40,909 INFO L276 IsEmpty]: Start isEmpty. Operand 2479 states and 3530 transitions. [2021-11-02 22:37:40,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-02 22:37:40,911 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:40,911 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:40,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:41,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:41,138 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:41,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:41,138 INFO L85 PathProgramCache]: Analyzing trace with hash -779790819, now seen corresponding path program 1 times [2021-11-02 22:37:41,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:41,138 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651199454] [2021-11-02 22:37:41,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:41,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:41,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,267 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:41,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:41,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:41,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,473 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:41,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:37:41,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,726 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-02 22:37:41,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:41,812 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:41,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:42,302 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 18 proven. 30 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:37:42,302 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:42,302 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651199454] [2021-11-02 22:37:42,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651199454] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:42,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338152910] [2021-11-02 22:37:42,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:42,303 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:42,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:42,306 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:42,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:37:43,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:43,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:37:43,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:43,787 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 15 treesize of output 11 [2021-11-02 22:37:43,970 INFO L354 Elim1Store]: treesize reduction 100, result has 9.9 percent of original size [2021-11-02 22:37:43,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 30 [2021-11-02 22:37:44,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:44,244 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:37:44,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 32 treesize of output 8 [2021-11-02 22:37:44,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:44,752 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:37:44,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 35 treesize of output 11 [2021-11-02 22:37:44,786 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:37:44,786 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338152910] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:44,786 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:44,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 23] total 51 [2021-11-02 22:37:44,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633159352] [2021-11-02 22:37:44,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-02 22:37:44,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:44,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-02 22:37:44,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2394, Unknown=0, NotChecked=0, Total=2550 [2021-11-02 22:37:44,788 INFO L87 Difference]: Start difference. First operand 2479 states and 3530 transitions. Second operand has 51 states, 47 states have (on average 3.4893617021276597) internal successors, (164), 46 states have internal predecessors, (164), 10 states have call successors, (15), 6 states have call predecessors, (15), 12 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-02 22:37:56,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:56,457 INFO L93 Difference]: Finished difference Result 4282 states and 6024 transitions. [2021-11-02 22:37:56,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-02 22:37:56,466 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 47 states have (on average 3.4893617021276597) internal successors, (164), 46 states have internal predecessors, (164), 10 states have call successors, (15), 6 states have call predecessors, (15), 12 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) Word has length 110 [2021-11-02 22:37:56,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:56,478 INFO L225 Difference]: With dead ends: 4282 [2021-11-02 22:37:56,479 INFO L226 Difference]: Without dead ends: 4181 [2021-11-02 22:37:56,481 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6988 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=2228, Invalid=21642, Unknown=0, NotChecked=0, Total=23870 [2021-11-02 22:37:56,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4181 states. [2021-11-02 22:37:56,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4181 to 3329. [2021-11-02 22:37:56,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3329 states, 2796 states have (on average 1.2918454935622317) internal successors, (3612), 2881 states have internal predecessors, (3612), 341 states have call successors, (341), 114 states have call predecessors, (341), 165 states have return successors, (901), 333 states have call predecessors, (901), 340 states have call successors, (901) [2021-11-02 22:37:56,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3329 states to 3329 states and 4854 transitions. [2021-11-02 22:37:56,576 INFO L78 Accepts]: Start accepts. Automaton has 3329 states and 4854 transitions. Word has length 110 [2021-11-02 22:37:56,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:56,577 INFO L470 AbstractCegarLoop]: Abstraction has 3329 states and 4854 transitions. [2021-11-02 22:37:56,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 47 states have (on average 3.4893617021276597) internal successors, (164), 46 states have internal predecessors, (164), 10 states have call successors, (15), 6 states have call predecessors, (15), 12 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-02 22:37:56,577 INFO L276 IsEmpty]: Start isEmpty. Operand 3329 states and 4854 transitions. [2021-11-02 22:37:56,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-02 22:37:56,579 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:56,579 INFO L513 BasicCegarLoop]: trace histogram [5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:56,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:56,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-02 22:37:56,794 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:56,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:56,794 INFO L85 PathProgramCache]: Analyzing trace with hash 447227884, now seen corresponding path program 1 times [2021-11-02 22:37:56,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:56,794 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515174744] [2021-11-02 22:37:56,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:56,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:56,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,914 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:56,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,918 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:56,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:56,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:56,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,943 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:56,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:37:56,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:56,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:56,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:37:56,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:57,045 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:37:57,045 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:57,045 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515174744] [2021-11-02 22:37:57,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515174744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:57,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700513290] [2021-11-02 22:37:57,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:57,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:57,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:57,050 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:57,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:37:58,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:58,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 535 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 22:37:58,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:58,623 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:37:58,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700513290] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:58,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:58,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 14 [2021-11-02 22:37:58,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973878439] [2021-11-02 22:37:58,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-02 22:37:58,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:58,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-02 22:37:58,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:37:58,624 INFO L87 Difference]: Start difference. First operand 3329 states and 4854 transitions. Second operand has 14 states, 14 states have (on average 7.071428571428571) internal successors, (99), 9 states have internal predecessors, (99), 1 states have call successors, (15), 6 states have call predecessors, (15), 3 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-02 22:37:59,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:59,091 INFO L93 Difference]: Finished difference Result 3366 states and 4893 transitions. [2021-11-02 22:37:59,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:37:59,091 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 7.071428571428571) internal successors, (99), 9 states have internal predecessors, (99), 1 states have call successors, (15), 6 states have call predecessors, (15), 3 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 114 [2021-11-02 22:37:59,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:59,099 INFO L225 Difference]: With dead ends: 3366 [2021-11-02 22:37:59,099 INFO L226 Difference]: Without dead ends: 3364 [2021-11-02 22:37:59,099 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:37:59,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3364 states. [2021-11-02 22:37:59,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3364 to 3330. [2021-11-02 22:37:59,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3330 states, 2797 states have (on average 1.2917411512334644) internal successors, (3613), 2882 states have internal predecessors, (3613), 341 states have call successors, (341), 114 states have call predecessors, (341), 165 states have return successors, (901), 333 states have call predecessors, (901), 340 states have call successors, (901) [2021-11-02 22:37:59,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3330 states to 3330 states and 4855 transitions. [2021-11-02 22:37:59,177 INFO L78 Accepts]: Start accepts. Automaton has 3330 states and 4855 transitions. Word has length 114 [2021-11-02 22:37:59,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:59,177 INFO L470 AbstractCegarLoop]: Abstraction has 3330 states and 4855 transitions. [2021-11-02 22:37:59,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 7.071428571428571) internal successors, (99), 9 states have internal predecessors, (99), 1 states have call successors, (15), 6 states have call predecessors, (15), 3 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-02 22:37:59,178 INFO L276 IsEmpty]: Start isEmpty. Operand 3330 states and 4855 transitions. [2021-11-02 22:37:59,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-02 22:37:59,179 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:59,180 INFO L513 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:59,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:59,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-02 22:37:59,406 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:37:59,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:59,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1810794313, now seen corresponding path program 2 times [2021-11-02 22:37:59,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:59,406 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776912482] [2021-11-02 22:37:59,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:59,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:59,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:59,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:37:59,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:37:59,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:59,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:37:59,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:37:59,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:37:59,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:37:59,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,610 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:37:59,611 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:59,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776912482] [2021-11-02 22:37:59,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776912482] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:59,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066236131] [2021-11-02 22:37:59,611 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:37:59,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:59,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:59,614 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:59,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:38:00,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:38:00,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:00,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-02 22:38:00,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:01,114 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:38:01,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066236131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:01,115 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:01,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 15 [2021-11-02 22:38:01,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814640237] [2021-11-02 22:38:01,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:38:01,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:01,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:38:01,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:38:01,118 INFO L87 Difference]: Start difference. First operand 3330 states and 4855 transitions. Second operand has 15 states, 15 states have (on average 6.666666666666667) internal successors, (100), 10 states have internal predecessors, (100), 1 states have call successors, (15), 6 states have call predecessors, (15), 3 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-02 22:38:01,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:01,782 INFO L93 Difference]: Finished difference Result 3367 states and 4894 transitions. [2021-11-02 22:38:01,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:38:01,782 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 6.666666666666667) internal successors, (100), 10 states have internal predecessors, (100), 1 states have call successors, (15), 6 states have call predecessors, (15), 3 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 115 [2021-11-02 22:38:01,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:01,788 INFO L225 Difference]: With dead ends: 3367 [2021-11-02 22:38:01,788 INFO L226 Difference]: Without dead ends: 3365 [2021-11-02 22:38:01,788 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=149, Invalid=403, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:38:01,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3365 states. [2021-11-02 22:38:01,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3365 to 3331. [2021-11-02 22:38:01,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3331 states, 2798 states have (on average 1.291636883488206) internal successors, (3614), 2883 states have internal predecessors, (3614), 341 states have call successors, (341), 114 states have call predecessors, (341), 165 states have return successors, (901), 333 states have call predecessors, (901), 340 states have call successors, (901) [2021-11-02 22:38:01,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3331 states to 3331 states and 4856 transitions. [2021-11-02 22:38:01,861 INFO L78 Accepts]: Start accepts. Automaton has 3331 states and 4856 transitions. Word has length 115 [2021-11-02 22:38:01,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:01,862 INFO L470 AbstractCegarLoop]: Abstraction has 3331 states and 4856 transitions. [2021-11-02 22:38:01,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 6.666666666666667) internal successors, (100), 10 states have internal predecessors, (100), 1 states have call successors, (15), 6 states have call predecessors, (15), 3 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-02 22:38:01,862 INFO L276 IsEmpty]: Start isEmpty. Operand 3331 states and 4856 transitions. [2021-11-02 22:38:01,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-02 22:38:01,863 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:01,864 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:01,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:02,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:02,078 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:38:02,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:02,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1402392459, now seen corresponding path program 1 times [2021-11-02 22:38:02,078 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:02,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764685895] [2021-11-02 22:38:02,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:02,079 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:02,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:38:02,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:38:02,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:38:02,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:38:02,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,276 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:38:02,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-02 22:38:02,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,350 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:38:02,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:02,536 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:38:02,537 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:02,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764685895] [2021-11-02 22:38:02,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764685895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:38:02,537 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:38:02,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2021-11-02 22:38:02,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317188648] [2021-11-02 22:38:02,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:38:02,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:02,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:38:02,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:38:02,538 INFO L87 Difference]: Start difference. First operand 3331 states and 4856 transitions. Second operand has 18 states, 16 states have (on average 6.0625) internal successors, (97), 16 states have internal predecessors, (97), 4 states have call successors, (7), 4 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-02 22:38:04,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:04,561 INFO L93 Difference]: Finished difference Result 3648 states and 5253 transitions. [2021-11-02 22:38:04,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:38:04,562 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 6.0625) internal successors, (97), 16 states have internal predecessors, (97), 4 states have call successors, (7), 4 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 115 [2021-11-02 22:38:04,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:04,570 INFO L225 Difference]: With dead ends: 3648 [2021-11-02 22:38:04,570 INFO L226 Difference]: Without dead ends: 3648 [2021-11-02 22:38:04,570 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=232, Invalid=1574, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:38:04,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3648 states. [2021-11-02 22:38:04,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3648 to 3348. [2021-11-02 22:38:04,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3348 states, 2815 states have (on average 1.292007104795737) internal successors, (3637), 2900 states have internal predecessors, (3637), 341 states have call successors, (341), 114 states have call predecessors, (341), 165 states have return successors, (901), 333 states have call predecessors, (901), 340 states have call successors, (901) [2021-11-02 22:38:04,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3348 states to 3348 states and 4879 transitions. [2021-11-02 22:38:04,650 INFO L78 Accepts]: Start accepts. Automaton has 3348 states and 4879 transitions. Word has length 115 [2021-11-02 22:38:04,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:04,651 INFO L470 AbstractCegarLoop]: Abstraction has 3348 states and 4879 transitions. [2021-11-02 22:38:04,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 6.0625) internal successors, (97), 16 states have internal predecessors, (97), 4 states have call successors, (7), 4 states have call predecessors, (7), 5 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-02 22:38:04,651 INFO L276 IsEmpty]: Start isEmpty. Operand 3348 states and 4879 transitions. [2021-11-02 22:38:04,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-02 22:38:04,652 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:04,653 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:04,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2021-11-02 22:38:04,653 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting mainErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:38:04,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:04,654 INFO L85 PathProgramCache]: Analyzing trace with hash -1402392458, now seen corresponding path program 1 times [2021-11-02 22:38:04,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:04,654 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215257276] [2021-11-02 22:38:04,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:04,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:04,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:38:04,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:38:04,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:38:04,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:38:04,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:38:04,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-02 22:38:04,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:04,987 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:38:04,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:05,169 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 33 proven. 10 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:38:05,170 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:05,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215257276] [2021-11-02 22:38:05,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215257276] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:05,170 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275121921] [2021-11-02 22:38:05,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:05,170 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:05,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:05,171 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:05,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:38:06,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:06,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 570 conjuncts, 153 conjunts are in the unsatisfiable core [2021-11-02 22:38:06,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:06,659 INFO L354 Elim1Store]: treesize reduction 83, result has 23.9 percent of original size [2021-11-02 22:38:06,660 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 3 case distinctions, treesize of input 15 treesize of output 31 [2021-11-02 22:38:08,474 INFO L354 Elim1Store]: treesize reduction 24, result has 51.0 percent of original size [2021-11-02 22:38:08,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 31 treesize of output 47 [2021-11-02 22:38:09,254 INFO L354 Elim1Store]: treesize reduction 29, result has 48.2 percent of original size [2021-11-02 22:38:09,255 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 27 treesize of output 42 [2021-11-02 22:38:09,285 INFO L354 Elim1Store]: treesize reduction 29, result has 48.2 percent of original size [2021-11-02 22:38:09,285 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 27 treesize of output 42 [2021-11-02 22:38:09,552 INFO L354 Elim1Store]: treesize reduction 108, result has 33.7 percent of original size [2021-11-02 22:38:09,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 192 treesize of output 173 [2021-11-02 22:38:09,592 INFO L354 Elim1Store]: treesize reduction 96, result has 32.9 percent of original size [2021-11-02 22:38:09,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 223 treesize of output 208 [2021-11-02 22:38:09,939 INFO L354 Elim1Store]: treesize reduction 184, result has 27.3 percent of original size [2021-11-02 22:38:09,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 14 case distinctions, treesize of input 58 treesize of output 107 [2021-11-02 22:38:13,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:13,271 INFO L354 Elim1Store]: treesize reduction 56, result has 1.8 percent of original size [2021-11-02 22:38:13,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 183 treesize of output 98 [2021-11-02 22:38:13,304 INFO L354 Elim1Store]: treesize reduction 48, result has 40.7 percent of original size [2021-11-02 22:38:13,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 89 treesize of output 111 [2021-11-02 22:38:13,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:13,313 INFO L354 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2021-11-02 22:38:13,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 99 treesize of output 74 [2021-11-02 22:39:26,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:26,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:26,069 INFO L354 Elim1Store]: treesize reduction 152, result has 0.7 percent of original size [2021-11-02 22:39:26,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 595 treesize of output 1 [2021-11-02 22:39:26,110 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:26,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275121921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:26,111 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:26,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 39] total 54 [2021-11-02 22:39:26,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161431415] [2021-11-02 22:39:26,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-02 22:39:26,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:26,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-02 22:39:26,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=2662, Unknown=26, NotChecked=0, Total=2862 [2021-11-02 22:39:26,114 INFO L87 Difference]: Start difference. First operand 3348 states and 4879 transitions. Second operand has 54 states, 51 states have (on average 3.8627450980392157) internal successors, (197), 48 states have internal predecessors, (197), 10 states have call successors, (15), 8 states have call predecessors, (15), 12 states have return successors, (14), 12 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-02 22:42:44,478 WARN L207 SmtUtils]: Spent 17.54 s on a formula simplification. DAG size of input: 138 DAG size of output: 124 [2021-11-02 22:43:08,881 WARN L207 SmtUtils]: Spent 7.45 s on a formula simplification. DAG size of input: 106 DAG size of output: 102 [2021-11-02 22:43:25,820 WARN L207 SmtUtils]: Spent 7.68 s on a formula simplification. DAG size of input: 107 DAG size of output: 103 [2021-11-02 22:43:57,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:57,350 INFO L93 Difference]: Finished difference Result 6776 states and 9921 transitions. [2021-11-02 22:43:57,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-02 22:43:57,351 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 51 states have (on average 3.8627450980392157) internal successors, (197), 48 states have internal predecessors, (197), 10 states have call successors, (15), 8 states have call predecessors, (15), 12 states have return successors, (14), 12 states have call predecessors, (14), 10 states have call successors, (14) Word has length 115 [2021-11-02 22:43:57,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:57,366 INFO L225 Difference]: With dead ends: 6776 [2021-11-02 22:43:57,366 INFO L226 Difference]: Without dead ends: 6772 [2021-11-02 22:43:57,368 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4160 ImplicationChecksByTransitivity, 223.9s TimeCoverageRelationStatistics Valid=909, Invalid=14513, Unknown=78, NotChecked=0, Total=15500 [2021-11-02 22:43:57,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6772 states. [2021-11-02 22:43:57,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6772 to 6030. [2021-11-02 22:43:57,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6030 states, 5001 states have (on average 1.2995400919816036) internal successors, (6499), 5136 states have internal predecessors, (6499), 695 states have call successors, (695), 220 states have call predecessors, (695), 308 states have return successors, (1832), 673 states have call predecessors, (1832), 694 states have call successors, (1832) [2021-11-02 22:43:57,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6030 states to 6030 states and 9026 transitions. [2021-11-02 22:43:57,540 INFO L78 Accepts]: Start accepts. Automaton has 6030 states and 9026 transitions. Word has length 115 [2021-11-02 22:43:57,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:57,541 INFO L470 AbstractCegarLoop]: Abstraction has 6030 states and 9026 transitions. [2021-11-02 22:43:57,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 51 states have (on average 3.8627450980392157) internal successors, (197), 48 states have internal predecessors, (197), 10 states have call successors, (15), 8 states have call predecessors, (15), 12 states have return successors, (14), 12 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-02 22:43:57,541 INFO L276 IsEmpty]: Start isEmpty. Operand 6030 states and 9026 transitions. [2021-11-02 22:43:57,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-02 22:43:57,543 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:57,543 INFO L513 BasicCegarLoop]: trace histogram [7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:57,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:43:57,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:57,758 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:43:57,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:57,758 INFO L85 PathProgramCache]: Analyzing trace with hash 1131680652, now seen corresponding path program 3 times [2021-11-02 22:43:57,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:57,759 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773304643] [2021-11-02 22:43:57,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:57,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:57,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:43:57,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:43:57,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,860 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:43:57,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,869 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:43:57,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-11-02 22:43:57,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:43:57,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:43:57,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:57,940 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:43:57,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:58,108 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:43:58,108 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:58,108 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773304643] [2021-11-02 22:43:58,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773304643] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:58,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053119765] [2021-11-02 22:43:58,109 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:43:58,109 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:58,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:58,110 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:58,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:43:59,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:43:59,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:43:59,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:43:59,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:00,583 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 15 treesize of output 11 [2021-11-02 22:44:00,825 INFO L354 Elim1Store]: treesize reduction 100, result has 9.9 percent of original size [2021-11-02 22:44:00,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 74 treesize of output 41 [2021-11-02 22:44:01,113 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 28 treesize of output 17 [2021-11-02 22:44:01,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:01,267 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:44:01,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 45 treesize of output 13 [2021-11-02 22:44:01,684 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 14 treesize of output 6 [2021-11-02 22:44:01,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:44:01,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:01,942 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:44:01,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 58 treesize of output 22 [2021-11-02 22:44:02,222 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:44:02,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053119765] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:02,222 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:44:02,223 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 36 [2021-11-02 22:44:02,223 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140182420] [2021-11-02 22:44:02,224 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 22:44:02,224 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:44:02,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 22:44:02,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1121, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:44:02,225 INFO L87 Difference]: Start difference. First operand 6030 states and 9026 transitions. Second operand has 36 states, 35 states have (on average 5.371428571428571) internal successors, (188), 29 states have internal predecessors, (188), 7 states have call successors, (18), 11 states have call predecessors, (18), 10 states have return successors, (16), 9 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-02 22:44:08,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:44:08,303 INFO L93 Difference]: Finished difference Result 6678 states and 10078 transitions. [2021-11-02 22:44:08,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-02 22:44:08,304 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 5.371428571428571) internal successors, (188), 29 states have internal predecessors, (188), 7 states have call successors, (18), 11 states have call predecessors, (18), 10 states have return successors, (16), 9 states have call predecessors, (16), 6 states have call successors, (16) Word has length 116 [2021-11-02 22:44:08,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:44:08,326 INFO L225 Difference]: With dead ends: 6678 [2021-11-02 22:44:08,327 INFO L226 Difference]: Without dead ends: 6669 [2021-11-02 22:44:08,328 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=672, Invalid=4584, Unknown=0, NotChecked=0, Total=5256 [2021-11-02 22:44:08,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6669 states. [2021-11-02 22:44:08,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6669 to 6192. [2021-11-02 22:44:08,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6192 states, 5134 states have (on average 1.2987923646279704) internal successors, (6668), 5270 states have internal predecessors, (6668), 718 states have call successors, (718), 226 states have call predecessors, (718), 316 states have return successors, (2031), 695 states have call predecessors, (2031), 717 states have call successors, (2031) [2021-11-02 22:44:08,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6192 states to 6192 states and 9417 transitions. [2021-11-02 22:44:08,513 INFO L78 Accepts]: Start accepts. Automaton has 6192 states and 9417 transitions. Word has length 116 [2021-11-02 22:44:08,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:44:08,514 INFO L470 AbstractCegarLoop]: Abstraction has 6192 states and 9417 transitions. [2021-11-02 22:44:08,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 5.371428571428571) internal successors, (188), 29 states have internal predecessors, (188), 7 states have call successors, (18), 11 states have call predecessors, (18), 10 states have return successors, (16), 9 states have call predecessors, (16), 6 states have call successors, (16) [2021-11-02 22:44:08,514 INFO L276 IsEmpty]: Start isEmpty. Operand 6192 states and 9417 transitions. [2021-11-02 22:44:08,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-02 22:44:08,516 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:44:08,516 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:44:08,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-02 22:44:08,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:08,742 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 63 more)] === [2021-11-02 22:44:08,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:44:08,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1439615673, now seen corresponding path program 1 times [2021-11-02 22:44:08,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:44:08,743 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346788311] [2021-11-02 22:44:08,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:44:08,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:44:08,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:09,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:44:09,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:09,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:44:09,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:09,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:44:09,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:09,696 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:44:09,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:09,788 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:44:09,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:09,831 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-11-02 22:44:09,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:10,492 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 22:44:10,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 46 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:44:12,409 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:44:12,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346788311] [2021-11-02 22:44:12,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346788311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:12,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723431391] [2021-11-02 22:44:12,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:44:12,409 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:12,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:44:12,410 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:44:12,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ec5c678e-5b14-4b86-b374-3d04a8b81515/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:44:14,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:14,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 581 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-02 22:44:14,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:15,482 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 15 treesize of output 11 [2021-11-02 22:44:15,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:15,677 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 35 treesize of output 26 [2021-11-02 22:44:16,322 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 5 treesize of output 3 [2021-11-02 22:44:16,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:16,330 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:44:16,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 33 treesize of output 9 [2021-11-02 22:45:03,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:45:03,598 INFO L354 Elim1Store]: treesize reduction 747, result has 11.2 percent of original size [2021-11-02 22:45:03,599 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 6 case distinctions, treesize of input 255 treesize of output 131 [2021-11-02 22:45:03,613 INFO L354 Elim1Store]: treesize reduction 4, result has 83.3 percent of original size [2021-11-02 22:45:03,614 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 255 treesize of output 255 [2021-11-02 22:45:04,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:45:04,349 INFO L354 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2021-11-02 22:45:04,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 24 [2021-11-02 22:45:04,361 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:45:04,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723431391] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:45:04,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:45:04,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 68 [2021-11-02 22:45:04,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649130070] [2021-11-02 22:45:04,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-02 22:45:04,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:45:04,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-02 22:45:04,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=4458, Unknown=14, NotChecked=0, Total=4692 [2021-11-02 22:45:04,363 INFO L87 Difference]: Start difference. First operand 6192 states and 9417 transitions. Second operand has 69 states, 64 states have (on average 3.109375) internal successors, (199), 63 states have internal predecessors, (199), 11 states have call successors, (16), 7 states have call predecessors, (16), 13 states have return successors, (14), 12 states have call predecessors, (14), 11 states have call successors, (14) [2021-11-02 22:46:52,314 WARN L207 SmtUtils]: Spent 8.31 s on a formula simplification. DAG size of input: 100 DAG size of output: 82 [2021-11-02 22:47:46,100 WARN L207 SmtUtils]: Spent 9.22 s on a formula simplification. DAG size of input: 97 DAG size of output: 76