./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/test-0214_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_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/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_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/test-0214_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/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_86058c40-ff63-423f-80bd-ae6764078984/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 8cac36e956b24d42ea840a07609fb159882a2e76b1195da25a4d4343e0b31026 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:50:47,937 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:50:47,939 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:50:47,990 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:50:47,991 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:50:47,995 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:50:47,997 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:50:48,001 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:50:48,004 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:50:48,009 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:50:48,010 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:50:48,012 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:50:48,013 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:50:48,016 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:50:48,018 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:50:48,023 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:50:48,025 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:50:48,026 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:50:48,028 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:50:48,036 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:50:48,038 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:50:48,039 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:50:48,042 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:50:48,044 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:50:48,053 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:50:48,053 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:50:48,054 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:50:48,056 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:50:48,056 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:50:48,058 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:50:48,059 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:50:48,060 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:50:48,062 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:50:48,063 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:50:48,065 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:50:48,065 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:50:48,066 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:50:48,066 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:50:48,067 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:50:48,068 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:50:48,069 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:50:48,070 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:50:48,110 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:50:48,113 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:50:48,114 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:50:48,114 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:50:48,122 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:50:48,122 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:50:48,123 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:50:48,123 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:50:48,123 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:50:48,123 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:50:48,124 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:50:48,125 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:50:48,125 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:50:48,125 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:50:48,125 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:50:48,126 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:50:48,126 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:50:48,126 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:50:48,126 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:50:48,126 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:50:48,127 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:50:48,127 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:50:48,127 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:50:48,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:50:48,128 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:50:48,128 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:50:48,128 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:50:48,128 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:50:48,129 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:50:48,130 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_86058c40-ff63-423f-80bd-ae6764078984/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8cac36e956b24d42ea840a07609fb159882a2e76b1195da25a4d4343e0b31026 [2021-11-02 22:50:48,463 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:50:48,488 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:50:48,492 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:50:48,493 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:50:48,499 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:50:48,500 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/list-ext-properties/test-0214_1.i [2021-11-02 22:50:48,600 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/e60a757ee/50a9d68ebb474609b50aef9dd7c920b1/FLAGa7171a1e8 [2021-11-02 22:50:49,208 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:50:49,210 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/sv-benchmarks/c/list-ext-properties/test-0214_1.i [2021-11-02 22:50:49,236 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/e60a757ee/50a9d68ebb474609b50aef9dd7c920b1/FLAGa7171a1e8 [2021-11-02 22:50:49,427 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/e60a757ee/50a9d68ebb474609b50aef9dd7c920b1 [2021-11-02 22:50:49,429 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:50:49,431 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:50:49,433 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:50:49,433 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:50:49,437 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:50:49,438 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,439 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30c145d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:49, skipping insertion in model container [2021-11-02 22:50:49,439 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:50:49" (1/1) ... [2021-11-02 22:50:49,447 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:50:49,483 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:50:49,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:50:49,922 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:50:49,972 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:50:50,021 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:50:50,022 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50 WrapperNode [2021-11-02 22:50:50,022 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:50:50,023 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:50:50,024 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:50:50,024 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:50:50,040 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,060 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,063 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,088 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,094 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,100 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,109 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:50:50,110 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:50:50,111 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:50:50,111 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:50:50,119 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (1/1) ... [2021-11-02 22:50:50,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:50:50,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:50:50,158 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:50:50,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:50:50,207 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:50:50,207 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:50:50,207 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 22:50:50,208 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:50:50,209 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:50:50,209 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-02 22:50:50,209 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-02 22:50:50,210 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-02 22:50:50,210 INFO L138 BoogieDeclarations]: Found implementation of procedure is_empty [2021-11-02 22:50:50,210 INFO L138 BoogieDeclarations]: Found implementation of procedure abort [2021-11-02 22:50:50,210 INFO L138 BoogieDeclarations]: Found implementation of procedure create_item [2021-11-02 22:50:50,211 INFO L138 BoogieDeclarations]: Found implementation of procedure append_one [2021-11-02 22:50:50,211 INFO L138 BoogieDeclarations]: Found implementation of procedure remove_one [2021-11-02 22:50:50,212 INFO L138 BoogieDeclarations]: Found implementation of procedure rand_end_point [2021-11-02 22:50:50,212 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:50:50,212 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-11-02 22:50:50,212 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:50:50,212 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:50:50,213 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:50:50,214 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:50:50,214 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:50:50,214 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:50:50,214 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:50:50,214 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:50:50,214 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:50:50,215 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:50:50,216 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:50:50,216 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:50:50,216 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-02 22:50:50,216 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-02 22:50:50,216 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-02 22:50:50,216 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:50:50,217 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:50:50,217 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:50:50,217 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:50:50,217 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:50:50,218 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:50:50,218 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:50:50,219 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:50:50,219 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:50:50,219 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:50:50,219 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:50:50,219 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:50:50,219 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:50:50,220 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:50:50,220 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:50:50,220 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:50:50,220 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:50:50,220 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:50:50,221 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:50:50,221 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:50:50,221 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:50:50,221 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:50:50,221 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:50:50,222 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:50:50,222 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:50:50,223 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:50:50,223 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:50:50,224 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:50:50,224 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:50:50,224 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:50:50,224 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:50:50,225 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:50:50,225 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:50:50,225 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:50:50,225 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:50:50,225 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:50:50,225 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:50:50,226 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:50:50,226 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:50:50,227 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:50:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:50:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:50:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:50:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:50:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:50:50,228 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:50:50,229 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:50:50,230 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:50:50,230 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:50:50,230 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:50:50,230 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:50:50,231 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:50:50,231 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:50:50,231 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:50:50,231 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:50:50,231 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:50:50,231 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:50:50,232 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:50:50,232 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:50:50,233 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:50:50,233 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:50:50,233 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:50:50,233 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:50:50,233 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:50:50,233 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:50:50,234 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:50:50,234 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:50:50,234 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:50:50,234 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:50:50,234 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:50:50,235 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:50:50,235 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:50:50,235 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:50:50,236 INFO L130 BoogieDeclarations]: Found specification of procedure memcpy [2021-11-02 22:50:50,237 INFO L130 BoogieDeclarations]: Found specification of procedure memmove [2021-11-02 22:50:50,239 INFO L130 BoogieDeclarations]: Found specification of procedure memccpy [2021-11-02 22:50:50,239 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2021-11-02 22:50:50,240 INFO L130 BoogieDeclarations]: Found specification of procedure memcmp [2021-11-02 22:50:50,240 INFO L130 BoogieDeclarations]: Found specification of procedure memchr [2021-11-02 22:50:50,241 INFO L130 BoogieDeclarations]: Found specification of procedure strcpy [2021-11-02 22:50:50,241 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy [2021-11-02 22:50:50,242 INFO L130 BoogieDeclarations]: Found specification of procedure strcat [2021-11-02 22:50:50,242 INFO L130 BoogieDeclarations]: Found specification of procedure strncat [2021-11-02 22:50:50,242 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2021-11-02 22:50:50,249 INFO L130 BoogieDeclarations]: Found specification of procedure strncmp [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll_l [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm_l [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strdup [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strndup [2021-11-02 22:50:50,250 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure strrchr [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure strcspn [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure strspn [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure strpbrk [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure strstr [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure strtok [2021-11-02 22:50:50,251 INFO L130 BoogieDeclarations]: Found specification of procedure __strtok_r [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure strtok_r [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure strnlen [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure strerror [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_r [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_l [2021-11-02 22:50:50,252 INFO L130 BoogieDeclarations]: Found specification of procedure bcmp [2021-11-02 22:50:50,253 INFO L130 BoogieDeclarations]: Found specification of procedure bcopy [2021-11-02 22:50:50,253 INFO L130 BoogieDeclarations]: Found specification of procedure bzero [2021-11-02 22:50:50,253 INFO L130 BoogieDeclarations]: Found specification of procedure index [2021-11-02 22:50:50,253 INFO L130 BoogieDeclarations]: Found specification of procedure rindex [2021-11-02 22:50:50,253 INFO L130 BoogieDeclarations]: Found specification of procedure ffs [2021-11-02 22:50:50,253 INFO L130 BoogieDeclarations]: Found specification of procedure ffsl [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure ffsll [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp_l [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp_l [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure explicit_bzero [2021-11-02 22:50:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure strsep [2021-11-02 22:50:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure strsignal [2021-11-02 22:50:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure __stpcpy [2021-11-02 22:50:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure stpcpy [2021-11-02 22:50:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure __stpncpy [2021-11-02 22:50:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure stpncpy [2021-11-02 22:50:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:50:50,256 INFO L130 BoogieDeclarations]: Found specification of procedure is_empty [2021-11-02 22:50:50,256 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 22:50:50,256 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:50:50,256 INFO L130 BoogieDeclarations]: Found specification of procedure create_item [2021-11-02 22:50:50,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 22:50:50,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 22:50:50,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:50:50,257 INFO L130 BoogieDeclarations]: Found specification of procedure append_one [2021-11-02 22:50:50,257 INFO L130 BoogieDeclarations]: Found specification of procedure remove_one [2021-11-02 22:50:50,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure rand_end_point [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:50:50,258 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:50:50,989 WARN L805 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-02 22:50:51,146 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint abortFINAL: assume true; [2021-11-02 22:50:51,204 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:50:51,205 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-02 22:50:51,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:50:51 BoogieIcfgContainer [2021-11-02 22:50:51,207 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:50:51,209 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:50:51,209 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:50:51,212 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:50:51,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:50:49" (1/3) ... [2021-11-02 22:50:51,213 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@433592a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:50:51, skipping insertion in model container [2021-11-02 22:50:51,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:50:50" (2/3) ... [2021-11-02 22:50:51,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@433592a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:50:51, skipping insertion in model container [2021-11-02 22:50:51,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:50:51" (3/3) ... [2021-11-02 22:50:51,215 INFO L111 eAbstractionObserver]: Analyzing ICFG test-0214_1.i [2021-11-02 22:50:51,221 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:50:51,221 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 57 error locations. [2021-11-02 22:50:51,268 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:50:51,274 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 22:50:51,274 INFO L340 AbstractCegarLoop]: Starting to check reachability of 57 error locations. [2021-11-02 22:50:51,294 INFO L276 IsEmpty]: Start isEmpty. Operand has 175 states, 100 states have (on average 1.82) internal successors, (182), 157 states have internal predecessors, (182), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-02 22:50:51,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-02 22:50:51,301 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:51,302 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:51,302 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:51,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:51,308 INFO L85 PathProgramCache]: Analyzing trace with hash -912843850, now seen corresponding path program 1 times [2021-11-02 22:50:51,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:51,318 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320166202] [2021-11-02 22:50:51,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:51,319 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:51,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:51,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:51,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:51,541 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 22:50:51,541 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:51,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320166202] [2021-11-02 22:50:51,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320166202] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:51,543 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:51,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:50:51,545 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938631260] [2021-11-02 22:50:51,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 22:50:51,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:51,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 22:50:51,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 22:50:51,567 INFO L87 Difference]: Start difference. First operand has 175 states, 100 states have (on average 1.82) internal successors, (182), 157 states have internal predecessors, (182), 10 states have call successors, (10), 9 states have call predecessors, (10), 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 22:50:51,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:51,991 INFO L93 Difference]: Finished difference Result 260 states and 299 transitions. [2021-11-02 22:50:51,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 22:50:51,993 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 22:50:51,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:52,006 INFO L225 Difference]: With dead ends: 260 [2021-11-02 22:50:52,006 INFO L226 Difference]: Without dead ends: 252 [2021-11-02 22:50:52,008 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 22:50:52,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-02 22:50:52,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 178. [2021-11-02 22:50:52,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 106 states have (on average 1.7547169811320755) internal successors, (186), 161 states have internal predecessors, (186), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-02 22:50:52,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 203 transitions. [2021-11-02 22:50:52,060 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 203 transitions. Word has length 10 [2021-11-02 22:50:52,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:52,061 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 203 transitions. [2021-11-02 22:50:52,061 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 22:50:52,061 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 203 transitions. [2021-11-02 22:50:52,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:50:52,062 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:52,062 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:52,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:50:52,063 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:52,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:52,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1305385011, now seen corresponding path program 1 times [2021-11-02 22:50:52,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:52,064 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740977563] [2021-11-02 22:50:52,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:52,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:52,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:52,219 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:52,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:52,274 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 22:50:52,274 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:52,275 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740977563] [2021-11-02 22:50:52,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740977563] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:52,275 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:52,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:50:52,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698444665] [2021-11-02 22:50:52,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:50:52,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:52,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:50:52,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:50:52,278 INFO L87 Difference]: Start difference. First operand 178 states and 203 transitions. Second operand has 5 states, 4 states have (on average 2.25) 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 22:50:53,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:53,105 INFO L93 Difference]: Finished difference Result 454 states and 511 transitions. [2021-11-02 22:50:53,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:50:53,106 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) 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 22:50:53,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:53,114 INFO L225 Difference]: With dead ends: 454 [2021-11-02 22:50:53,114 INFO L226 Difference]: Without dead ends: 454 [2021-11-02 22:50:53,114 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:50:53,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-11-02 22:50:53,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 178. [2021-11-02 22:50:53,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 106 states have (on average 1.7452830188679245) internal successors, (185), 161 states have internal predecessors, (185), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-02 22:50:53,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 202 transitions. [2021-11-02 22:50:53,131 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 202 transitions. Word has length 12 [2021-11-02 22:50:53,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:53,132 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 202 transitions. [2021-11-02 22:50:53,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) 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 22:50:53,132 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 202 transitions. [2021-11-02 22:50:53,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:50:53,133 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:53,133 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:53,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:50:53,133 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:53,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:53,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1303537969, now seen corresponding path program 1 times [2021-11-02 22:50:53,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:53,134 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459496303] [2021-11-02 22:50:53,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:53,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:53,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:53,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:53,272 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 22:50:53,272 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:53,272 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459496303] [2021-11-02 22:50:53,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459496303] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:53,273 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:53,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-02 22:50:53,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931147744] [2021-11-02 22:50:53,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:50:53,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:53,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:50:53,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:50:53,291 INFO L87 Difference]: Start difference. First operand 178 states and 202 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 22:50:53,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:53,856 INFO L93 Difference]: Finished difference Result 404 states and 461 transitions. [2021-11-02 22:50:53,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:50:53,856 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 22:50:53,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:53,858 INFO L225 Difference]: With dead ends: 404 [2021-11-02 22:50:53,859 INFO L226 Difference]: Without dead ends: 404 [2021-11-02 22:50:53,859 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 22:50:53,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-11-02 22:50:53,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 253. [2021-11-02 22:50:53,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 168 states have (on average 1.7083333333333333) internal successors, (287), 224 states have internal predecessors, (287), 15 states have call successors, (15), 13 states have call predecessors, (15), 14 states have return successors, (18), 15 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-02 22:50:53,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 320 transitions. [2021-11-02 22:50:53,877 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 320 transitions. Word has length 12 [2021-11-02 22:50:53,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:53,877 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 320 transitions. [2021-11-02 22:50:53,877 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 22:50:53,877 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 320 transitions. [2021-11-02 22:50:53,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:50:53,878 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:53,878 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:53,878 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:50:53,878 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:53,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:53,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1303537970, now seen corresponding path program 1 times [2021-11-02 22:50:53,879 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:53,879 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769844042] [2021-11-02 22:50:53,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:53,880 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:53,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:54,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:54,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:54,050 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 22:50:54,050 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:54,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769844042] [2021-11-02 22:50:54,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769844042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:54,052 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:54,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:50:54,053 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007024429] [2021-11-02 22:50:54,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:50:54,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:54,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:50:54,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:50:54,060 INFO L87 Difference]: Start difference. First operand 253 states and 320 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 22:50:54,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:54,861 INFO L93 Difference]: Finished difference Result 561 states and 683 transitions. [2021-11-02 22:50:54,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:50:54,862 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 22:50:54,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:54,866 INFO L225 Difference]: With dead ends: 561 [2021-11-02 22:50:54,866 INFO L226 Difference]: Without dead ends: 561 [2021-11-02 22:50:54,866 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 22:50:54,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-11-02 22:50:54,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 365. [2021-11-02 22:50:54,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 263 states have (on average 1.673003802281369) internal successors, (440), 321 states have internal predecessors, (440), 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 22:50:54,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 495 transitions. [2021-11-02 22:50:54,887 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 495 transitions. Word has length 12 [2021-11-02 22:50:54,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:54,888 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 495 transitions. [2021-11-02 22:50:54,888 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 22:50:54,888 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 495 transitions. [2021-11-02 22:50:54,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:50:54,888 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:54,889 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:54,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:50:54,889 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:54,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:54,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1303538032, now seen corresponding path program 1 times [2021-11-02 22:50:54,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:54,890 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87262751] [2021-11-02 22:50:54,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:54,890 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:54,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:54,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:54,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:55,014 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 22:50:55,014 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:55,014 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87262751] [2021-11-02 22:50:55,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87262751] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:55,015 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:55,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:50:55,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685428581] [2021-11-02 22:50:55,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:50:55,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:55,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:50:55,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:50:55,027 INFO L87 Difference]: Start difference. First operand 365 states and 495 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 22:50:55,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:55,857 INFO L93 Difference]: Finished difference Result 559 states and 680 transitions. [2021-11-02 22:50:55,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:50:55,858 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 22:50:55,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:55,862 INFO L225 Difference]: With dead ends: 559 [2021-11-02 22:50:55,862 INFO L226 Difference]: Without dead ends: 559 [2021-11-02 22:50:55,863 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 22:50:55,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 559 states. [2021-11-02 22:50:55,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 559 to 364. [2021-11-02 22:50:55,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 262 states have (on average 1.6717557251908397) internal successors, (438), 320 states have internal predecessors, (438), 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 22:50:55,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 493 transitions. [2021-11-02 22:50:55,881 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 493 transitions. Word has length 12 [2021-11-02 22:50:55,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:55,881 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 493 transitions. [2021-11-02 22:50:55,882 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 22:50:55,882 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 493 transitions. [2021-11-02 22:50:55,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:50:55,883 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:55,883 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:55,883 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:50:55,883 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:55,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:55,884 INFO L85 PathProgramCache]: Analyzing trace with hash -1394454085, now seen corresponding path program 1 times [2021-11-02 22:50:55,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:55,884 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77467542] [2021-11-02 22:50:55,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:55,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:55,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:55,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:55,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:55,932 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 22:50:55,933 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:55,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77467542] [2021-11-02 22:50:55,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77467542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:55,933 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:55,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:50:55,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795446086] [2021-11-02 22:50:55,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:50:55,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:55,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:50:55,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:50:55,936 INFO L87 Difference]: Start difference. First operand 364 states and 493 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 22:50:56,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:56,327 INFO L93 Difference]: Finished difference Result 451 states and 612 transitions. [2021-11-02 22:50:56,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:50:56,328 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 22:50:56,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:56,331 INFO L225 Difference]: With dead ends: 451 [2021-11-02 22:50:56,332 INFO L226 Difference]: Without dead ends: 446 [2021-11-02 22:50:56,332 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 22:50:56,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-11-02 22:50:56,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 361. [2021-11-02 22:50:56,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 259 states have (on average 1.664092664092664) internal successors, (431), 317 states have internal predecessors, (431), 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 22:50:56,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 486 transitions. [2021-11-02 22:50:56,348 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 486 transitions. Word has length 15 [2021-11-02 22:50:56,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:56,348 INFO L470 AbstractCegarLoop]: Abstraction has 361 states and 486 transitions. [2021-11-02 22:50:56,348 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 22:50:56,348 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 486 transitions. [2021-11-02 22:50:56,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:50:56,349 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:56,349 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:56,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:50:56,350 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting append_oneErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:56,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:56,350 INFO L85 PathProgramCache]: Analyzing trace with hash -721095228, now seen corresponding path program 1 times [2021-11-02 22:50:56,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:56,351 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154062967] [2021-11-02 22:50:56,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:56,351 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:56,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:56,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:56,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:56,400 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:50:56,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:56,404 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 22:50:56,405 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:56,405 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154062967] [2021-11-02 22:50:56,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154062967] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:56,405 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:56,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:50:56,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110182483] [2021-11-02 22:50:56,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:50:56,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:56,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:50:56,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:50:56,407 INFO L87 Difference]: Start difference. First operand 361 states and 486 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:50:56,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:56,899 INFO L93 Difference]: Finished difference Result 468 states and 643 transitions. [2021-11-02 22:50:56,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:50:56,899 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-02 22:50:56,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:56,903 INFO L225 Difference]: With dead ends: 468 [2021-11-02 22:50:56,903 INFO L226 Difference]: Without dead ends: 468 [2021-11-02 22:50:56,904 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:50:56,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-11-02 22:50:56,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 365. [2021-11-02 22:50:56,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 263 states have (on average 1.6463878326996197) internal successors, (433), 321 states have internal predecessors, (433), 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 22:50:56,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 488 transitions. [2021-11-02 22:50:56,920 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 488 transitions. Word has length 20 [2021-11-02 22:50:56,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:56,921 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 488 transitions. [2021-11-02 22:50:56,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:50:56,921 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 488 transitions. [2021-11-02 22:50:56,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:50:56,922 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:56,922 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:56,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:50:56,923 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting append_oneErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:56,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:56,923 INFO L85 PathProgramCache]: Analyzing trace with hash -328068218, now seen corresponding path program 1 times [2021-11-02 22:50:56,923 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:56,924 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313184586] [2021-11-02 22:50:56,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:56,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:56,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:56,979 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:56,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:56,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:50:56,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:56,993 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 22:50:56,993 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:56,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313184586] [2021-11-02 22:50:56,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313184586] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:56,994 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:56,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:50:56,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616443048] [2021-11-02 22:50:56,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:50:56,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:56,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:50:56,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:50:56,996 INFO L87 Difference]: Start difference. First operand 365 states and 488 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:50:57,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:57,737 INFO L93 Difference]: Finished difference Result 539 states and 700 transitions. [2021-11-02 22:50:57,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:50:57,737 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-02 22:50:57,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:57,741 INFO L225 Difference]: With dead ends: 539 [2021-11-02 22:50:57,741 INFO L226 Difference]: Without dead ends: 539 [2021-11-02 22:50:57,741 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:50:57,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2021-11-02 22:50:57,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 361. [2021-11-02 22:50:57,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 263 states have (on average 1.6121673003802282) internal successors, (424), 317 states have internal predecessors, (424), 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 22:50:57,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 479 transitions. [2021-11-02 22:50:57,756 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 479 transitions. Word has length 20 [2021-11-02 22:50:57,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:57,757 INFO L470 AbstractCegarLoop]: Abstraction has 361 states and 479 transitions. [2021-11-02 22:50:57,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:50:57,757 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 479 transitions. [2021-11-02 22:50:57,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-02 22:50:57,758 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:57,758 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:50:57,758 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:50:57,759 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting append_oneErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:57,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:57,759 INFO L85 PathProgramCache]: Analyzing trace with hash -328068217, now seen corresponding path program 1 times [2021-11-02 22:50:57,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:57,760 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356664857] [2021-11-02 22:50:57,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:57,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:57,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:57,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:57,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:57,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:50:57,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:57,936 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 22:50:57,937 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:57,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356664857] [2021-11-02 22:50:57,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356664857] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:57,937 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:57,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:50:57,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742340796] [2021-11-02 22:50:57,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:50:57,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:57,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:50:57,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:50:57,940 INFO L87 Difference]: Start difference. First operand 361 states and 479 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:50:58,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:50:58,950 INFO L93 Difference]: Finished difference Result 502 states and 607 transitions. [2021-11-02 22:50:58,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:50:58,950 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-11-02 22:50:58,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:50:58,954 INFO L225 Difference]: With dead ends: 502 [2021-11-02 22:50:58,954 INFO L226 Difference]: Without dead ends: 502 [2021-11-02 22:50:58,954 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:50:58,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-11-02 22:50:58,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 369. [2021-11-02 22:50:58,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 269 states have (on average 1.6022304832713754) internal successors, (431), 321 states have internal predecessors, (431), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:50:58,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 490 transitions. [2021-11-02 22:50:58,969 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 490 transitions. Word has length 20 [2021-11-02 22:50:58,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:50:58,970 INFO L470 AbstractCegarLoop]: Abstraction has 369 states and 490 transitions. [2021-11-02 22:50:58,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:50:58,970 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 490 transitions. [2021-11-02 22:50:58,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:50:58,971 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:50:58,972 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 22:50:58,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-02 22:50:58,972 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting is_emptyErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:50:58,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:50:58,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1136679769, now seen corresponding path program 1 times [2021-11-02 22:50:58,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:50:58,973 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145518338] [2021-11-02 22:50:58,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:50:58,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:50:58,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:59,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:50:59,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:59,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:50:59,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:50:59,065 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 22:50:59,066 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:50:59,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145518338] [2021-11-02 22:50:59,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145518338] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:50:59,067 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:50:59,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:50:59,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495909312] [2021-11-02 22:50:59,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:50:59,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:50:59,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:50:59,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:50:59,069 INFO L87 Difference]: Start difference. First operand 369 states and 490 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 22:51:00,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:00,006 INFO L93 Difference]: Finished difference Result 529 states and 675 transitions. [2021-11-02 22:51:00,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:51:00,006 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 22:51:00,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:00,010 INFO L225 Difference]: With dead ends: 529 [2021-11-02 22:51:00,010 INFO L226 Difference]: Without dead ends: 529 [2021-11-02 22:51:00,010 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:51:00,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-11-02 22:51:00,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 365. [2021-11-02 22:51:00,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 271 states have (on average 1.5461254612546125) internal successors, (419), 317 states have internal predecessors, (419), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:00,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 478 transitions. [2021-11-02 22:51:00,029 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 478 transitions. Word has length 25 [2021-11-02 22:51:00,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:00,030 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 478 transitions. [2021-11-02 22:51:00,030 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 22:51:00,030 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 478 transitions. [2021-11-02 22:51:00,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:51:00,033 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:00,033 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 22:51:00,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:51:00,034 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting is_emptyErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:00,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:00,034 INFO L85 PathProgramCache]: Analyzing trace with hash -1136679768, now seen corresponding path program 1 times [2021-11-02 22:51:00,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:00,035 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83304761] [2021-11-02 22:51:00,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:00,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:00,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:00,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:00,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:00,237 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:00,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:00,246 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 22:51:00,246 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:00,247 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83304761] [2021-11-02 22:51:00,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83304761] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:00,247 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:00,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:51:00,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308299999] [2021-11-02 22:51:00,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:00,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:00,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:00,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:00,249 INFO L87 Difference]: Start difference. First operand 365 states and 478 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 22:51:01,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:01,306 INFO L93 Difference]: Finished difference Result 474 states and 574 transitions. [2021-11-02 22:51:01,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:51:01,307 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 22:51:01,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:01,311 INFO L225 Difference]: With dead ends: 474 [2021-11-02 22:51:01,311 INFO L226 Difference]: Without dead ends: 474 [2021-11-02 22:51:01,312 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 22:51:01,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2021-11-02 22:51:01,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 365. [2021-11-02 22:51:01,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 271 states have (on average 1.5092250922509225) internal successors, (409), 317 states have internal predecessors, (409), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:01,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 468 transitions. [2021-11-02 22:51:01,332 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 468 transitions. Word has length 25 [2021-11-02 22:51:01,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:01,333 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 468 transitions. [2021-11-02 22:51:01,333 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 22:51:01,333 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 468 transitions. [2021-11-02 22:51:01,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-02 22:51:01,334 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:01,335 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] [2021-11-02 22:51:01,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 22:51:01,335 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting create_itemErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:01,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:01,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1454614621, now seen corresponding path program 1 times [2021-11-02 22:51:01,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:01,336 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116491906] [2021-11-02 22:51:01,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:01,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:01,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,389 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:01,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:01,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,405 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 22:51:01,405 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:01,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116491906] [2021-11-02 22:51:01,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116491906] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:01,406 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:01,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:51:01,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686941008] [2021-11-02 22:51:01,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:51:01,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:01,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:51:01,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:51:01,408 INFO L87 Difference]: Start difference. First operand 365 states and 468 transitions. Second operand has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 22:51:01,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:01,772 INFO L93 Difference]: Finished difference Result 433 states and 560 transitions. [2021-11-02 22:51:01,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:51:01,774 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 27 [2021-11-02 22:51:01,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:01,777 INFO L225 Difference]: With dead ends: 433 [2021-11-02 22:51:01,778 INFO L226 Difference]: Without dead ends: 433 [2021-11-02 22:51:01,778 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 22:51:01,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-11-02 22:51:01,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 362. [2021-11-02 22:51:01,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 271 states have (on average 1.4870848708487086) internal successors, (403), 314 states have internal predecessors, (403), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:01,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 462 transitions. [2021-11-02 22:51:01,794 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 462 transitions. Word has length 27 [2021-11-02 22:51:01,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:01,795 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 462 transitions. [2021-11-02 22:51:01,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 22:51:01,796 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 462 transitions. [2021-11-02 22:51:01,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-02 22:51:01,805 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:01,805 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] [2021-11-02 22:51:01,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-02 22:51:01,806 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:01,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:01,807 INFO L85 PathProgramCache]: Analyzing trace with hash 1454614622, now seen corresponding path program 1 times [2021-11-02 22:51:01,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:01,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707067832] [2021-11-02 22:51:01,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:01,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:01,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:01,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:01,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:01,937 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 22:51:01,937 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:01,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707067832] [2021-11-02 22:51:01,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707067832] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:01,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:01,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:51:01,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512137254] [2021-11-02 22:51:01,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:51:01,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:01,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:51:01,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:51:01,942 INFO L87 Difference]: Start difference. First operand 362 states and 462 transitions. Second operand has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 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 22:51:02,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:02,434 INFO L93 Difference]: Finished difference Result 455 states and 586 transitions. [2021-11-02 22:51:02,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:51:02,435 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 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 27 [2021-11-02 22:51:02,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:02,440 INFO L225 Difference]: With dead ends: 455 [2021-11-02 22:51:02,441 INFO L226 Difference]: Without dead ends: 455 [2021-11-02 22:51:02,441 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 22:51:02,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-02 22:51:02,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 365. [2021-11-02 22:51:02,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 275 states have (on average 1.4727272727272727) internal successors, (405), 317 states have internal predecessors, (405), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:02,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 464 transitions. [2021-11-02 22:51:02,458 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 464 transitions. Word has length 27 [2021-11-02 22:51:02,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:02,461 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 464 transitions. [2021-11-02 22:51:02,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 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 22:51:02,462 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 464 transitions. [2021-11-02 22:51:02,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:51:02,464 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:02,464 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] [2021-11-02 22:51:02,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 22:51:02,465 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting create_itemErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:02,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:02,466 INFO L85 PathProgramCache]: Analyzing trace with hash 2143380552, now seen corresponding path program 1 times [2021-11-02 22:51:02,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:02,466 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502461305] [2021-11-02 22:51:02,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:02,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:02,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:02,587 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:02,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:02,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:02,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:02,599 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 22:51:02,599 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:02,600 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502461305] [2021-11-02 22:51:02,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502461305] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:02,600 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:02,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:51:02,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721055179] [2021-11-02 22:51:02,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:51:02,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:02,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:51:02,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:51:02,606 INFO L87 Difference]: Start difference. First operand 365 states and 464 transitions. Second operand has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 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 22:51:03,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:03,122 INFO L93 Difference]: Finished difference Result 454 states and 584 transitions. [2021-11-02 22:51:03,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:51:03,135 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 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 28 [2021-11-02 22:51:03,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:03,139 INFO L225 Difference]: With dead ends: 454 [2021-11-02 22:51:03,139 INFO L226 Difference]: Without dead ends: 454 [2021-11-02 22:51:03,140 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 22:51:03,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-11-02 22:51:03,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 367. [2021-11-02 22:51:03,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 277 states have (on average 1.4693140794223827) internal successors, (407), 319 states have internal predecessors, (407), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:03,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 466 transitions. [2021-11-02 22:51:03,174 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 466 transitions. Word has length 28 [2021-11-02 22:51:03,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:03,175 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 466 transitions. [2021-11-02 22:51:03,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.25) internal successors, (21), 4 states have internal predecessors, (21), 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 22:51:03,175 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 466 transitions. [2021-11-02 22:51:03,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:51:03,178 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:03,178 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] [2021-11-02 22:51:03,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:51:03,178 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:03,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:03,180 INFO L85 PathProgramCache]: Analyzing trace with hash 2143436256, now seen corresponding path program 1 times [2021-11-02 22:51:03,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:03,181 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926522150] [2021-11-02 22:51:03,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:03,181 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:03,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:03,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:03,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:03,363 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:03,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:03,378 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 22:51:03,379 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:03,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926522150] [2021-11-02 22:51:03,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926522150] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:03,380 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:03,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:51:03,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772578493] [2021-11-02 22:51:03,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:51:03,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:03,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:51:03,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:51:03,382 INFO L87 Difference]: Start difference. First operand 367 states and 466 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 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 22:51:04,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:04,233 INFO L93 Difference]: Finished difference Result 438 states and 562 transitions. [2021-11-02 22:51:04,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:51:04,234 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 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 28 [2021-11-02 22:51:04,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:04,237 INFO L225 Difference]: With dead ends: 438 [2021-11-02 22:51:04,237 INFO L226 Difference]: Without dead ends: 438 [2021-11-02 22:51:04,238 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 22:51:04,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-11-02 22:51:04,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 367. [2021-11-02 22:51:04,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 277 states have (on average 1.4620938628158844) internal successors, (405), 319 states have internal predecessors, (405), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:04,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 464 transitions. [2021-11-02 22:51:04,255 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 464 transitions. Word has length 28 [2021-11-02 22:51:04,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:04,256 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 464 transitions. [2021-11-02 22:51:04,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 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 22:51:04,256 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 464 transitions. [2021-11-02 22:51:04,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-02 22:51:04,257 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:04,257 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] [2021-11-02 22:51:04,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:51:04,258 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:04,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:04,259 INFO L85 PathProgramCache]: Analyzing trace with hash 2143438178, now seen corresponding path program 1 times [2021-11-02 22:51:04,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:04,259 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200316078] [2021-11-02 22:51:04,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:04,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:04,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:04,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:04,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:04,420 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:04,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:04,446 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 22:51:04,449 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:04,450 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200316078] [2021-11-02 22:51:04,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200316078] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:04,453 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:04,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:51:04,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384685319] [2021-11-02 22:51:04,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:51:04,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:04,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:51:04,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:51:04,456 INFO L87 Difference]: Start difference. First operand 367 states and 464 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 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 22:51:05,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:05,457 INFO L93 Difference]: Finished difference Result 428 states and 548 transitions. [2021-11-02 22:51:05,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:51:05,458 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 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 28 [2021-11-02 22:51:05,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:05,462 INFO L225 Difference]: With dead ends: 428 [2021-11-02 22:51:05,462 INFO L226 Difference]: Without dead ends: 428 [2021-11-02 22:51:05,465 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 22:51:05,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-11-02 22:51:05,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 357. [2021-11-02 22:51:05,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 269 states have (on average 1.453531598513011) internal successors, (391), 309 states have internal predecessors, (391), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:05,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 450 transitions. [2021-11-02 22:51:05,495 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 450 transitions. Word has length 28 [2021-11-02 22:51:05,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:05,496 INFO L470 AbstractCegarLoop]: Abstraction has 357 states and 450 transitions. [2021-11-02 22:51:05,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 7 states have internal predecessors, (21), 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 22:51:05,497 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 450 transitions. [2021-11-02 22:51:05,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:51:05,497 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:05,498 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:05,498 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:51:05,498 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:05,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:05,499 INFO L85 PathProgramCache]: Analyzing trace with hash 2076876828, now seen corresponding path program 1 times [2021-11-02 22:51:05,499 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:05,499 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388557848] [2021-11-02 22:51:05,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:05,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:05,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:05,574 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:05,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:05,581 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:51:05,581 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:05,582 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388557848] [2021-11-02 22:51:05,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388557848] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:05,582 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:05,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:51:05,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685309648] [2021-11-02 22:51:05,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:51:05,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:05,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:51:05,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:51:05,585 INFO L87 Difference]: Start difference. First operand 357 states and 450 transitions. Second operand has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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 22:51:05,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:05,948 INFO L93 Difference]: Finished difference Result 432 states and 551 transitions. [2021-11-02 22:51:05,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:51:05,949 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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 26 [2021-11-02 22:51:05,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:05,951 INFO L225 Difference]: With dead ends: 432 [2021-11-02 22:51:05,952 INFO L226 Difference]: Without dead ends: 425 [2021-11-02 22:51:05,952 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:51:05,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-11-02 22:51:05,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 353. [2021-11-02 22:51:05,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 265 states have (on average 1.4528301886792452) internal successors, (385), 305 states have internal predecessors, (385), 26 states have call successors, (26), 22 states have call predecessors, (26), 23 states have return successors, (33), 25 states have call predecessors, (33), 25 states have call successors, (33) [2021-11-02 22:51:05,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 444 transitions. [2021-11-02 22:51:05,968 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 444 transitions. Word has length 26 [2021-11-02 22:51:05,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:05,969 INFO L470 AbstractCegarLoop]: Abstraction has 353 states and 444 transitions. [2021-11-02 22:51:05,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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 22:51:05,969 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 444 transitions. [2021-11-02 22:51:05,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-02 22:51:05,970 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:05,970 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 22:51:05,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-02 22:51:05,971 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting is_emptyErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:05,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:05,972 INFO L85 PathProgramCache]: Analyzing trace with hash -240424469, now seen corresponding path program 1 times [2021-11-02 22:51:05,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:05,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006977808] [2021-11-02 22:51:05,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:05,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:05,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:06,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:06,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:06,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:06,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:06,710 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 22:51:06,711 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:06,711 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006977808] [2021-11-02 22:51:06,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006977808] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:06,711 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:06,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-02 22:51:06,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113141686] [2021-11-02 22:51:06,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:51:06,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:06,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:51:06,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:51:06,716 INFO L87 Difference]: Start difference. First operand 353 states and 444 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 22:51:09,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:09,612 INFO L93 Difference]: Finished difference Result 519 states and 648 transitions. [2021-11-02 22:51:09,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:51:09,613 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 22:51:09,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:09,616 INFO L225 Difference]: With dead ends: 519 [2021-11-02 22:51:09,617 INFO L226 Difference]: Without dead ends: 518 [2021-11-02 22:51:09,618 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=462, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:51:09,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-11-02 22:51:09,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 427. [2021-11-02 22:51:09,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 324 states have (on average 1.4135802469135803) internal successors, (458), 365 states have internal predecessors, (458), 34 states have call successors, (34), 29 states have call predecessors, (34), 31 states have return successors, (46), 32 states have call predecessors, (46), 33 states have call successors, (46) [2021-11-02 22:51:09,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 538 transitions. [2021-11-02 22:51:09,638 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 538 transitions. Word has length 31 [2021-11-02 22:51:09,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:09,639 INFO L470 AbstractCegarLoop]: Abstraction has 427 states and 538 transitions. [2021-11-02 22:51:09,639 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 22:51:09,639 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 538 transitions. [2021-11-02 22:51:09,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:51:09,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:09,640 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 22:51:09,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-02 22:51:09,641 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting create_itemErr6REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:09,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:09,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1020493451, now seen corresponding path program 1 times [2021-11-02 22:51:09,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:09,642 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206124323] [2021-11-02 22:51:09,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:09,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:09,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:09,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:09,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:09,909 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:09,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:09,929 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 22:51:09,929 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:09,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206124323] [2021-11-02 22:51:09,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206124323] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:09,930 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:09,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:51:09,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895176615] [2021-11-02 22:51:09,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:51:09,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:09,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:51:09,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:51:09,934 INFO L87 Difference]: Start difference. First operand 427 states and 538 transitions. Second operand has 11 states, 10 states have (on average 2.5) internal successors, (25), 7 states have internal predecessors, (25), 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 22:51:11,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:11,312 INFO L93 Difference]: Finished difference Result 644 states and 795 transitions. [2021-11-02 22:51:11,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:51:11,313 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 7 states have internal predecessors, (25), 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 32 [2021-11-02 22:51:11,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:11,318 INFO L225 Difference]: With dead ends: 644 [2021-11-02 22:51:11,318 INFO L226 Difference]: Without dead ends: 644 [2021-11-02 22:51:11,319 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:51:11,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-11-02 22:51:11,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 517. [2021-11-02 22:51:11,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 399 states have (on average 1.3784461152882206) internal successors, (550), 442 states have internal predecessors, (550), 42 states have call successors, (42), 36 states have call predecessors, (42), 39 states have return successors, (59), 38 states have call predecessors, (59), 41 states have call successors, (59) [2021-11-02 22:51:11,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 651 transitions. [2021-11-02 22:51:11,344 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 651 transitions. Word has length 32 [2021-11-02 22:51:11,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:11,345 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 651 transitions. [2021-11-02 22:51:11,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.5) internal successors, (25), 7 states have internal predecessors, (25), 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 22:51:11,345 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 651 transitions. [2021-11-02 22:51:11,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:51:11,346 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:11,346 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] [2021-11-02 22:51:11,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-02 22:51:11,347 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting append_oneErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:11,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:11,348 INFO L85 PathProgramCache]: Analyzing trace with hash -1679157902, now seen corresponding path program 1 times [2021-11-02 22:51:11,348 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:11,348 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31389158] [2021-11-02 22:51:11,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:11,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:11,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:11,433 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:11,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:11,443 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:11,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:11,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:51:11,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:11,521 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 22:51:11,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:11,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31389158] [2021-11-02 22:51:11,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31389158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:11,523 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:11,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:51:11,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292427791] [2021-11-02 22:51:11,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:51:11,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:11,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:51:11,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:51:11,525 INFO L87 Difference]: Start difference. First operand 517 states and 651 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 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 22:51:12,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:12,990 INFO L93 Difference]: Finished difference Result 720 states and 904 transitions. [2021-11-02 22:51:12,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:51:12,991 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 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 36 [2021-11-02 22:51:12,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:12,996 INFO L225 Difference]: With dead ends: 720 [2021-11-02 22:51:12,996 INFO L226 Difference]: Without dead ends: 720 [2021-11-02 22:51:12,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:51:12,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-11-02 22:51:13,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 519. [2021-11-02 22:51:13,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 401 states have (on average 1.374064837905237) internal successors, (551), 444 states have internal predecessors, (551), 42 states have call successors, (42), 36 states have call predecessors, (42), 40 states have return successors, (60), 38 states have call predecessors, (60), 41 states have call successors, (60) [2021-11-02 22:51:13,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 653 transitions. [2021-11-02 22:51:13,027 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 653 transitions. Word has length 36 [2021-11-02 22:51:13,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:13,028 INFO L470 AbstractCegarLoop]: Abstraction has 519 states and 653 transitions. [2021-11-02 22:51:13,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 6 states have internal predecessors, (28), 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 22:51:13,029 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 653 transitions. [2021-11-02 22:51:13,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:51:13,029 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:13,030 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] [2021-11-02 22:51:13,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 22:51:13,030 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting append_oneErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:13,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:13,031 INFO L85 PathProgramCache]: Analyzing trace with hash -1679157901, now seen corresponding path program 1 times [2021-11-02 22:51:13,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:13,031 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070304806] [2021-11-02 22:51:13,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:13,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:13,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:13,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:13,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:13,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:13,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:13,262 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:51:13,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:13,353 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 22:51:13,353 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:13,354 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070304806] [2021-11-02 22:51:13,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070304806] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:13,354 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:13,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:51:13,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748181394] [2021-11-02 22:51:13,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:51:13,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:13,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:51:13,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:51:13,358 INFO L87 Difference]: Start difference. First operand 519 states and 653 transitions. Second operand has 11 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 22:51:14,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:14,950 INFO L93 Difference]: Finished difference Result 758 states and 954 transitions. [2021-11-02 22:51:14,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:51:14,953 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 36 [2021-11-02 22:51:14,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:14,959 INFO L225 Difference]: With dead ends: 758 [2021-11-02 22:51:14,959 INFO L226 Difference]: Without dead ends: 758 [2021-11-02 22:51:14,960 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:51:14,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 758 states. [2021-11-02 22:51:14,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 758 to 519. [2021-11-02 22:51:14,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 401 states have (on average 1.371571072319202) internal successors, (550), 444 states have internal predecessors, (550), 42 states have call successors, (42), 36 states have call predecessors, (42), 40 states have return successors, (60), 38 states have call predecessors, (60), 41 states have call successors, (60) [2021-11-02 22:51:14,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 652 transitions. [2021-11-02 22:51:14,985 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 652 transitions. Word has length 36 [2021-11-02 22:51:14,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:14,985 INFO L470 AbstractCegarLoop]: Abstraction has 519 states and 652 transitions. [2021-11-02 22:51:14,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 22:51:14,986 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 652 transitions. [2021-11-02 22:51:14,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:51:14,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:14,987 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] [2021-11-02 22:51:14,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-02 22:51:14,988 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting append_oneErr5REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:14,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:14,988 INFO L85 PathProgramCache]: Analyzing trace with hash -514287414, now seen corresponding path program 1 times [2021-11-02 22:51:14,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:14,989 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752737318] [2021-11-02 22:51:14,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:14,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:15,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:15,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:15,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:15,110 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:15,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:15,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:51:15,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:15,182 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 22:51:15,183 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:15,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752737318] [2021-11-02 22:51:15,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752737318] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:15,183 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:15,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:51:15,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123564259] [2021-11-02 22:51:15,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:51:15,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:15,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:51:15,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:51:15,186 INFO L87 Difference]: Start difference. First operand 519 states and 652 transitions. Second operand has 10 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 7 states have internal predecessors, (29), 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 22:51:16,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:16,282 INFO L93 Difference]: Finished difference Result 586 states and 743 transitions. [2021-11-02 22:51:16,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:51:16,283 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 7 states have internal predecessors, (29), 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 37 [2021-11-02 22:51:16,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:16,286 INFO L225 Difference]: With dead ends: 586 [2021-11-02 22:51:16,286 INFO L226 Difference]: Without dead ends: 586 [2021-11-02 22:51:16,287 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:51:16,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2021-11-02 22:51:16,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 517. [2021-11-02 22:51:16,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 401 states have (on average 1.3615960099750624) internal successors, (546), 442 states have internal predecessors, (546), 42 states have call successors, (42), 36 states have call predecessors, (42), 40 states have return successors, (60), 38 states have call predecessors, (60), 41 states have call successors, (60) [2021-11-02 22:51:16,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 648 transitions. [2021-11-02 22:51:16,310 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 648 transitions. Word has length 37 [2021-11-02 22:51:16,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:16,311 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 648 transitions. [2021-11-02 22:51:16,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.2222222222222223) internal successors, (29), 7 states have internal predecessors, (29), 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 22:51:16,311 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 648 transitions. [2021-11-02 22:51:16,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:51:16,312 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:16,312 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 22:51:16,313 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-02 22:51:16,313 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting remove_oneErr6ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:16,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:16,314 INFO L85 PathProgramCache]: Analyzing trace with hash 665854200, now seen corresponding path program 1 times [2021-11-02 22:51:16,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:16,314 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816828533] [2021-11-02 22:51:16,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:16,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:16,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:16,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:16,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:16,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:16,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:16,462 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:16,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:16,470 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 22:51:16,471 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:16,471 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816828533] [2021-11-02 22:51:16,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816828533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:16,472 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:16,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:51:16,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713874519] [2021-11-02 22:51:16,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:16,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:16,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:16,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:16,476 INFO L87 Difference]: Start difference. First operand 517 states and 648 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 22:51:17,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:17,601 INFO L93 Difference]: Finished difference Result 636 states and 784 transitions. [2021-11-02 22:51:17,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:51:17,602 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 22:51:17,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:17,605 INFO L225 Difference]: With dead ends: 636 [2021-11-02 22:51:17,605 INFO L226 Difference]: Without dead ends: 636 [2021-11-02 22:51:17,606 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=165, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:51:17,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-11-02 22:51:17,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 517. [2021-11-02 22:51:17,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 401 states have (on average 1.3566084788029926) internal successors, (544), 442 states have internal predecessors, (544), 42 states have call successors, (42), 36 states have call predecessors, (42), 40 states have return successors, (60), 38 states have call predecessors, (60), 41 states have call successors, (60) [2021-11-02 22:51:17,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 646 transitions. [2021-11-02 22:51:17,629 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 646 transitions. Word has length 39 [2021-11-02 22:51:17,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:17,630 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 646 transitions. [2021-11-02 22:51:17,630 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 22:51:17,630 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 646 transitions. [2021-11-02 22:51:17,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-02 22:51:17,631 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:17,631 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 22:51:17,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-02 22:51:17,632 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting append_oneErr9REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:17,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:17,633 INFO L85 PathProgramCache]: Analyzing trace with hash -308966612, now seen corresponding path program 1 times [2021-11-02 22:51:17,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:17,633 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846843694] [2021-11-02 22:51:17,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:17,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:17,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:17,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:17,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:17,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:17,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:17,960 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 22:51:17,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:18,061 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 22:51:18,062 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:18,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846843694] [2021-11-02 22:51:18,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846843694] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:18,062 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:18,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:51:18,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207594406] [2021-11-02 22:51:18,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:51:18,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:18,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:51:18,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:51:18,066 INFO L87 Difference]: Start difference. First operand 517 states and 646 transitions. Second operand has 13 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 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 22:51:20,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:20,251 INFO L93 Difference]: Finished difference Result 752 states and 943 transitions. [2021-11-02 22:51:20,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:51:20,252 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 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 39 [2021-11-02 22:51:20,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:20,257 INFO L225 Difference]: With dead ends: 752 [2021-11-02 22:51:20,257 INFO L226 Difference]: Without dead ends: 752 [2021-11-02 22:51:20,258 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=173, Invalid=639, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:51:20,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 752 states. [2021-11-02 22:51:20,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 752 to 517. [2021-11-02 22:51:20,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 401 states have (on average 1.3516209476309227) internal successors, (542), 442 states have internal predecessors, (542), 42 states have call successors, (42), 36 states have call predecessors, (42), 40 states have return successors, (60), 38 states have call predecessors, (60), 41 states have call successors, (60) [2021-11-02 22:51:20,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 644 transitions. [2021-11-02 22:51:20,281 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 644 transitions. Word has length 39 [2021-11-02 22:51:20,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:20,282 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 644 transitions. [2021-11-02 22:51:20,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 9 states have internal predecessors, (31), 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 22:51:20,282 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 644 transitions. [2021-11-02 22:51:20,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 22:51:20,283 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:20,283 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:20,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-02 22:51:20,284 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting remove_oneErr7ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:20,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:20,284 INFO L85 PathProgramCache]: Analyzing trace with hash -833356176, now seen corresponding path program 1 times [2021-11-02 22:51:20,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:20,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [402815883] [2021-11-02 22:51:20,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:20,287 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:20,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:20,476 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:20,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:20,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:20,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:20,507 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:20,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:20,517 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 22:51:20,517 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:20,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [402815883] [2021-11-02 22:51:20,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [402815883] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:20,518 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:20,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:51:20,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510940880] [2021-11-02 22:51:20,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:20,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:20,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:20,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:20,520 INFO L87 Difference]: Start difference. First operand 517 states and 644 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 22:51:21,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:21,486 INFO L93 Difference]: Finished difference Result 715 states and 885 transitions. [2021-11-02 22:51:21,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:51:21,487 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 22:51:21,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:21,492 INFO L225 Difference]: With dead ends: 715 [2021-11-02 22:51:21,492 INFO L226 Difference]: Without dead ends: 715 [2021-11-02 22:51:21,492 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:51:21,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2021-11-02 22:51:21,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 570. [2021-11-02 22:51:21,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 570 states, 445 states have (on average 1.3370786516853932) internal successors, (595), 487 states have internal predecessors, (595), 47 states have call successors, (47), 40 states have call predecessors, (47), 45 states have return successors, (71), 42 states have call predecessors, (71), 46 states have call successors, (71) [2021-11-02 22:51:21,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 713 transitions. [2021-11-02 22:51:21,517 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 713 transitions. Word has length 40 [2021-11-02 22:51:21,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:21,517 INFO L470 AbstractCegarLoop]: Abstraction has 570 states and 713 transitions. [2021-11-02 22:51:21,518 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 22:51:21,518 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 713 transitions. [2021-11-02 22:51:21,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:51:21,519 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:21,519 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:21,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-02 22:51:21,520 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting is_emptyErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:21,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:21,520 INFO L85 PathProgramCache]: Analyzing trace with hash 389501960, now seen corresponding path program 1 times [2021-11-02 22:51:21,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:21,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880062186] [2021-11-02 22:51:21,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:21,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:21,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:21,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:21,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:21,572 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-11-02 22:51:21,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:21,576 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:51:21,576 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:21,576 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880062186] [2021-11-02 22:51:21,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1880062186] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:21,577 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:21,577 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:51:21,577 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369565488] [2021-11-02 22:51:21,578 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:51:21,578 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:21,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:51:21,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:51:21,580 INFO L87 Difference]: Start difference. First operand 570 states and 713 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 3 states have internal predecessors, (33), 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 22:51:21,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:21,960 INFO L93 Difference]: Finished difference Result 656 states and 824 transitions. [2021-11-02 22:51:21,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:51:21,975 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 3 states have internal predecessors, (33), 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 41 [2021-11-02 22:51:21,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:21,979 INFO L225 Difference]: With dead ends: 656 [2021-11-02 22:51:21,980 INFO L226 Difference]: Without dead ends: 655 [2021-11-02 22:51:21,980 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 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 22:51:21,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-11-02 22:51:21,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 573. [2021-11-02 22:51:21,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 573 states, 448 states have (on average 1.3325892857142858) internal successors, (597), 490 states have internal predecessors, (597), 47 states have call successors, (47), 40 states have call predecessors, (47), 45 states have return successors, (71), 42 states have call predecessors, (71), 46 states have call successors, (71) [2021-11-02 22:51:22,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 573 states to 573 states and 715 transitions. [2021-11-02 22:51:22,002 INFO L78 Accepts]: Start accepts. Automaton has 573 states and 715 transitions. Word has length 41 [2021-11-02 22:51:22,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:22,002 INFO L470 AbstractCegarLoop]: Abstraction has 573 states and 715 transitions. [2021-11-02 22:51:22,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 3 states have internal predecessors, (33), 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 22:51:22,003 INFO L276 IsEmpty]: Start isEmpty. Operand 573 states and 715 transitions. [2021-11-02 22:51:22,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:51:22,003 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:22,004 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] [2021-11-02 22:51:22,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-02 22:51:22,004 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting is_emptyErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:22,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:22,005 INFO L85 PathProgramCache]: Analyzing trace with hash 523515466, now seen corresponding path program 1 times [2021-11-02 22:51:22,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:22,005 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082847063] [2021-11-02 22:51:22,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:22,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:22,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:22,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:22,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:22,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-11-02 22:51:22,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:22,768 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:51:22,768 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:22,768 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082847063] [2021-11-02 22:51:22,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082847063] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:22,769 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:22,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-02 22:51:22,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474391392] [2021-11-02 22:51:22,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:51:22,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:22,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:51:22,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:51:22,774 INFO L87 Difference]: Start difference. First operand 573 states and 715 transitions. Second operand has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 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 22:51:25,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:25,400 INFO L93 Difference]: Finished difference Result 678 states and 838 transitions. [2021-11-02 22:51:25,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:51:25,401 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 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 41 [2021-11-02 22:51:25,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:25,405 INFO L225 Difference]: With dead ends: 678 [2021-11-02 22:51:25,405 INFO L226 Difference]: Without dead ends: 677 [2021-11-02 22:51:25,406 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=535, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:51:25,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-11-02 22:51:25,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 565. [2021-11-02 22:51:25,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 565 states, 441 states have (on average 1.3287981859410432) internal successors, (586), 483 states have internal predecessors, (586), 47 states have call successors, (47), 40 states have call predecessors, (47), 44 states have return successors, (69), 41 states have call predecessors, (69), 46 states have call successors, (69) [2021-11-02 22:51:25,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 565 states to 565 states and 702 transitions. [2021-11-02 22:51:25,427 INFO L78 Accepts]: Start accepts. Automaton has 565 states and 702 transitions. Word has length 41 [2021-11-02 22:51:25,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:25,428 INFO L470 AbstractCegarLoop]: Abstraction has 565 states and 702 transitions. [2021-11-02 22:51:25,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 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 22:51:25,428 INFO L276 IsEmpty]: Start isEmpty. Operand 565 states and 702 transitions. [2021-11-02 22:51:25,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:51:25,429 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:25,429 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 22:51:25,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-02 22:51:25,430 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting remove_oneErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:25,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:25,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1575286633, now seen corresponding path program 1 times [2021-11-02 22:51:25,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:25,431 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592082820] [2021-11-02 22:51:25,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:25,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:25,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:25,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:25,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:25,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:25,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:25,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:25,545 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 22:51:25,545 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:25,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592082820] [2021-11-02 22:51:25,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592082820] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:25,546 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:25,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:51:25,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494083650] [2021-11-02 22:51:25,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:25,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:25,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:25,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:25,548 INFO L87 Difference]: Start difference. First operand 565 states and 702 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 22:51:26,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:26,205 INFO L93 Difference]: Finished difference Result 638 states and 795 transitions. [2021-11-02 22:51:26,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:51:26,206 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 22:51:26,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:26,210 INFO L225 Difference]: With dead ends: 638 [2021-11-02 22:51:26,210 INFO L226 Difference]: Without dead ends: 638 [2021-11-02 22:51:26,211 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:51:26,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-11-02 22:51:26,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 565. [2021-11-02 22:51:26,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 565 states, 441 states have (on average 1.3242630385487528) internal successors, (584), 483 states have internal predecessors, (584), 47 states have call successors, (47), 40 states have call predecessors, (47), 44 states have return successors, (69), 41 states have call predecessors, (69), 46 states have call successors, (69) [2021-11-02 22:51:26,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 565 states to 565 states and 700 transitions. [2021-11-02 22:51:26,231 INFO L78 Accepts]: Start accepts. Automaton has 565 states and 700 transitions. Word has length 42 [2021-11-02 22:51:26,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:26,232 INFO L470 AbstractCegarLoop]: Abstraction has 565 states and 700 transitions. [2021-11-02 22:51:26,232 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 22:51:26,232 INFO L276 IsEmpty]: Start isEmpty. Operand 565 states and 700 transitions. [2021-11-02 22:51:26,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:51:26,233 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:26,233 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 22:51:26,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-11-02 22:51:26,234 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting remove_oneErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:26,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:26,234 INFO L85 PathProgramCache]: Analyzing trace with hash -1575284711, now seen corresponding path program 1 times [2021-11-02 22:51:26,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:26,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139554950] [2021-11-02 22:51:26,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:26,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:26,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:26,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:26,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:26,403 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:26,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:26,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:26,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:26,434 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 22:51:26,434 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:26,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139554950] [2021-11-02 22:51:26,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139554950] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:26,435 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:26,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:51:26,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735345738] [2021-11-02 22:51:26,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:51:26,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:26,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:51:26,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:51:26,437 INFO L87 Difference]: Start difference. First operand 565 states and 700 transitions. Second operand has 11 states, 10 states have (on average 3.4) internal successors, (34), 8 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 22:51:27,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:27,381 INFO L93 Difference]: Finished difference Result 708 states and 886 transitions. [2021-11-02 22:51:27,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:51:27,382 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.4) internal successors, (34), 8 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 22:51:27,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:27,385 INFO L225 Difference]: With dead ends: 708 [2021-11-02 22:51:27,385 INFO L226 Difference]: Without dead ends: 708 [2021-11-02 22:51:27,386 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=132, Invalid=420, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:51:27,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2021-11-02 22:51:27,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 578. [2021-11-02 22:51:27,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 455 states have (on average 1.3296703296703296) internal successors, (605), 497 states have internal predecessors, (605), 47 states have call successors, (47), 40 states have call predecessors, (47), 43 states have return successors, (68), 40 states have call predecessors, (68), 46 states have call successors, (68) [2021-11-02 22:51:27,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 720 transitions. [2021-11-02 22:51:27,407 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 720 transitions. Word has length 42 [2021-11-02 22:51:27,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:27,408 INFO L470 AbstractCegarLoop]: Abstraction has 578 states and 720 transitions. [2021-11-02 22:51:27,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.4) internal successors, (34), 8 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 22:51:27,408 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 720 transitions. [2021-11-02 22:51:27,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:51:27,409 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:27,410 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 22:51:27,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-02 22:51:27,410 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting remove_oneErr12REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:27,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:27,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1573437669, now seen corresponding path program 1 times [2021-11-02 22:51:27,411 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:27,411 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825451408] [2021-11-02 22:51:27,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:27,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:27,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:27,493 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:27,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:27,499 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:27,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:27,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:27,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:27,541 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 22:51:27,541 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:27,542 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825451408] [2021-11-02 22:51:27,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825451408] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:27,542 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:27,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:51:27,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702591863] [2021-11-02 22:51:27,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:27,543 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:27,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:27,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:27,544 INFO L87 Difference]: Start difference. First operand 578 states and 720 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 22:51:28,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:28,233 INFO L93 Difference]: Finished difference Result 636 states and 785 transitions. [2021-11-02 22:51:28,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:51:28,234 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 22:51:28,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:28,237 INFO L225 Difference]: With dead ends: 636 [2021-11-02 22:51:28,237 INFO L226 Difference]: Without dead ends: 636 [2021-11-02 22:51:28,238 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:51:28,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-11-02 22:51:28,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 558. [2021-11-02 22:51:28,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 558 states, 437 states have (on average 1.311212814645309) internal successors, (573), 477 states have internal predecessors, (573), 47 states have call successors, (47), 40 states have call predecessors, (47), 43 states have return successors, (68), 40 states have call predecessors, (68), 46 states have call successors, (68) [2021-11-02 22:51:28,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 558 states to 558 states and 688 transitions. [2021-11-02 22:51:28,257 INFO L78 Accepts]: Start accepts. Automaton has 558 states and 688 transitions. Word has length 42 [2021-11-02 22:51:28,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:28,258 INFO L470 AbstractCegarLoop]: Abstraction has 558 states and 688 transitions. [2021-11-02 22:51:28,258 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 22:51:28,258 INFO L276 IsEmpty]: Start isEmpty. Operand 558 states and 688 transitions. [2021-11-02 22:51:28,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:51:28,259 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:28,259 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 22:51:28,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-02 22:51:28,260 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting remove_oneErr9REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:28,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:28,261 INFO L85 PathProgramCache]: Analyzing trace with hash -1991364685, now seen corresponding path program 1 times [2021-11-02 22:51:28,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:28,261 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18708068] [2021-11-02 22:51:28,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:28,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:28,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:28,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:28,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:28,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:28,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:28,400 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:28,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:28,444 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 22:51:28,445 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:28,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18708068] [2021-11-02 22:51:28,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18708068] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:28,445 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:28,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:51:28,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825443264] [2021-11-02 22:51:28,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:51:28,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:28,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:51:28,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:51:28,448 INFO L87 Difference]: Start difference. First operand 558 states and 688 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 22:51:29,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:29,982 INFO L93 Difference]: Finished difference Result 734 states and 884 transitions. [2021-11-02 22:51:29,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:51:29,982 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 22:51:29,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:29,987 INFO L225 Difference]: With dead ends: 734 [2021-11-02 22:51:29,987 INFO L226 Difference]: Without dead ends: 734 [2021-11-02 22:51:29,988 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:51:29,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 734 states. [2021-11-02 22:51:30,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 734 to 600. [2021-11-02 22:51:30,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 473 states have (on average 1.306553911205074) internal successors, (618), 513 states have internal predecessors, (618), 50 states have call successors, (50), 40 states have call predecessors, (50), 47 states have return successors, (74), 46 states have call predecessors, (74), 49 states have call successors, (74) [2021-11-02 22:51:30,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 742 transitions. [2021-11-02 22:51:30,010 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 742 transitions. Word has length 42 [2021-11-02 22:51:30,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:30,010 INFO L470 AbstractCegarLoop]: Abstraction has 600 states and 742 transitions. [2021-11-02 22:51:30,010 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 22:51:30,011 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 742 transitions. [2021-11-02 22:51:30,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:51:30,012 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:30,012 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 22:51:30,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-02 22:51:30,013 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting remove_oneErr13REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:30,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:30,013 INFO L85 PathProgramCache]: Analyzing trace with hash -2020117831, now seen corresponding path program 1 times [2021-11-02 22:51:30,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:30,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021297074] [2021-11-02 22:51:30,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:30,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:30,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:30,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:30,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:30,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 22:51:30,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:30,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:51:30,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:30,361 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 22:51:30,362 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:30,362 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021297074] [2021-11-02 22:51:30,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021297074] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:30,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:30,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 22:51:30,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614209508] [2021-11-02 22:51:30,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:51:30,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:30,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:51:30,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:51:30,365 INFO L87 Difference]: Start difference. First operand 600 states and 742 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 22:51:31,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:31,517 INFO L93 Difference]: Finished difference Result 681 states and 826 transitions. [2021-11-02 22:51:31,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:51:31,518 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 22:51:31,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:31,521 INFO L225 Difference]: With dead ends: 681 [2021-11-02 22:51:31,521 INFO L226 Difference]: Without dead ends: 681 [2021-11-02 22:51:31,521 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:51:31,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-11-02 22:51:31,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 600. [2021-11-02 22:51:31,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 473 states have (on average 1.2980972515856237) internal successors, (614), 513 states have internal predecessors, (614), 50 states have call successors, (50), 40 states have call predecessors, (50), 47 states have return successors, (70), 46 states have call predecessors, (70), 49 states have call successors, (70) [2021-11-02 22:51:31,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 734 transitions. [2021-11-02 22:51:31,542 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 734 transitions. Word has length 44 [2021-11-02 22:51:31,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:31,542 INFO L470 AbstractCegarLoop]: Abstraction has 600 states and 734 transitions. [2021-11-02 22:51:31,542 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 22:51:31,543 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 734 transitions. [2021-11-02 22:51:31,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-02 22:51:31,544 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:31,544 INFO L513 BasicCegarLoop]: trace histogram [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 22:51:31,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-11-02 22:51:31,545 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting append_oneErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:31,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:31,545 INFO L85 PathProgramCache]: Analyzing trace with hash 1167475411, now seen corresponding path program 1 times [2021-11-02 22:51:31,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:31,546 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964927213] [2021-11-02 22:51:31,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:31,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:31,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:31,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:31,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:31,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:31,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:31,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:31,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:31,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:31,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:31,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-11-02 22:51:31,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:31,642 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-02 22:51:31,642 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:31,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964927213] [2021-11-02 22:51:31,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964927213] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:31,643 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:31,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:51:31,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240023226] [2021-11-02 22:51:31,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:51:31,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:31,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:51:31,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:51:31,645 INFO L87 Difference]: Start difference. First operand 600 states and 734 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 22:51:32,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:32,199 INFO L93 Difference]: Finished difference Result 676 states and 827 transitions. [2021-11-02 22:51:32,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:51:32,200 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 54 [2021-11-02 22:51:32,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:32,205 INFO L225 Difference]: With dead ends: 676 [2021-11-02 22:51:32,205 INFO L226 Difference]: Without dead ends: 676 [2021-11-02 22:51:32,209 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:51:32,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-11-02 22:51:32,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 602. [2021-11-02 22:51:32,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 475 states have (on average 1.2968421052631578) internal successors, (616), 515 states have internal predecessors, (616), 50 states have call successors, (50), 40 states have call predecessors, (50), 47 states have return successors, (70), 46 states have call predecessors, (70), 49 states have call successors, (70) [2021-11-02 22:51:32,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 736 transitions. [2021-11-02 22:51:32,238 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 736 transitions. Word has length 54 [2021-11-02 22:51:32,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:32,239 INFO L470 AbstractCegarLoop]: Abstraction has 602 states and 736 transitions. [2021-11-02 22:51:32,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 3 states have internal predecessors, (39), 2 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-02 22:51:32,239 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 736 transitions. [2021-11-02 22:51:32,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-02 22:51:32,240 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:32,241 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:51:32,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-02 22:51:32,241 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting append_oneErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:32,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:32,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1560502421, now seen corresponding path program 1 times [2021-11-02 22:51:32,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:32,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903890521] [2021-11-02 22:51:32,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:32,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:32,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:32,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:32,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:32,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:32,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:32,519 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:32,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:32,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:32,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:32,652 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-11-02 22:51:32,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:51:32,685 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:32,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903890521] [2021-11-02 22:51:32,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903890521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:32,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729452450] [2021-11-02 22:51:32,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:32,686 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:32,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:32,688 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:32,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:51:33,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:33,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-02 22:51:33,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:34,037 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:51:34,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729452450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:34,038 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:34,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 23 [2021-11-02 22:51:34,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784373185] [2021-11-02 22:51:34,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:51:34,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:34,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:51:34,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:51:34,041 INFO L87 Difference]: Start difference. First operand 602 states and 736 transitions. Second operand has 24 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 20 states have internal predecessors, (76), 9 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-02 22:51:36,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:36,279 INFO L93 Difference]: Finished difference Result 675 states and 825 transitions. [2021-11-02 22:51:36,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:51:36,280 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 20 states have internal predecessors, (76), 9 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) Word has length 54 [2021-11-02 22:51:36,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:36,285 INFO L225 Difference]: With dead ends: 675 [2021-11-02 22:51:36,285 INFO L226 Difference]: Without dead ends: 675 [2021-11-02 22:51:36,286 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=195, Invalid=995, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:51:36,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-11-02 22:51:36,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 597. [2021-11-02 22:51:36,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 597 states, 472 states have (on average 1.2923728813559323) internal successors, (610), 512 states have internal predecessors, (610), 49 states have call successors, (49), 39 states have call predecessors, (49), 47 states have return successors, (69), 45 states have call predecessors, (69), 48 states have call successors, (69) [2021-11-02 22:51:36,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 597 states to 597 states and 728 transitions. [2021-11-02 22:51:36,306 INFO L78 Accepts]: Start accepts. Automaton has 597 states and 728 transitions. Word has length 54 [2021-11-02 22:51:36,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:36,306 INFO L470 AbstractCegarLoop]: Abstraction has 597 states and 728 transitions. [2021-11-02 22:51:36,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 20 states have internal predecessors, (76), 9 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-02 22:51:36,307 INFO L276 IsEmpty]: Start isEmpty. Operand 597 states and 728 transitions. [2021-11-02 22:51:36,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 22:51:36,308 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:36,309 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:51:36,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:36,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-02 22:51:36,523 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:36,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:36,523 INFO L85 PathProgramCache]: Analyzing trace with hash -739971455, now seen corresponding path program 1 times [2021-11-02 22:51:36,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:36,524 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912683678] [2021-11-02 22:51:36,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:36,524 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:36,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:36,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:36,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:36,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:36,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:36,639 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:36,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:36,657 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:36,682 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:51:36,683 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:36,683 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912683678] [2021-11-02 22:51:36,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912683678] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:36,684 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056926057] [2021-11-02 22:51:36,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:36,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:36,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:36,685 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:36,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:51:37,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:37,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:51:37,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:37,237 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:51:37,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056926057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:37,237 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:37,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 8 [2021-11-02 22:51:37,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891333415] [2021-11-02 22:51:37,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:37,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:37,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:37,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:37,242 INFO L87 Difference]: Start difference. First operand 597 states and 728 transitions. Second operand has 8 states, 8 states have (on average 7.375) internal successors, (59), 6 states have internal predecessors, (59), 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 22:51:38,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:38,141 INFO L93 Difference]: Finished difference Result 731 states and 917 transitions. [2021-11-02 22:51:38,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:51:38,142 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 7.375) internal successors, (59), 6 states have internal predecessors, (59), 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 56 [2021-11-02 22:51:38,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:38,147 INFO L225 Difference]: With dead ends: 731 [2021-11-02 22:51:38,147 INFO L226 Difference]: Without dead ends: 731 [2021-11-02 22:51:38,148 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:51:38,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-11-02 22:51:38,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 611. [2021-11-02 22:51:38,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 611 states, 482 states have (on average 1.2904564315352698) internal successors, (622), 522 states have internal predecessors, (622), 53 states have call successors, (53), 39 states have call predecessors, (53), 47 states have return successors, (73), 49 states have call predecessors, (73), 52 states have call successors, (73) [2021-11-02 22:51:38,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 611 states to 611 states and 748 transitions. [2021-11-02 22:51:38,172 INFO L78 Accepts]: Start accepts. Automaton has 611 states and 748 transitions. Word has length 56 [2021-11-02 22:51:38,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:38,173 INFO L470 AbstractCegarLoop]: Abstraction has 611 states and 748 transitions. [2021-11-02 22:51:38,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 7.375) internal successors, (59), 6 states have internal predecessors, (59), 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 22:51:38,174 INFO L276 IsEmpty]: Start isEmpty. Operand 611 states and 748 transitions. [2021-11-02 22:51:38,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 22:51:38,175 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:38,175 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] [2021-11-02 22:51:38,219 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:38,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:38,399 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:38,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:38,399 INFO L85 PathProgramCache]: Analyzing trace with hash -998136893, now seen corresponding path program 1 times [2021-11-02 22:51:38,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:38,400 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256618321] [2021-11-02 22:51:38,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:38,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:38,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:38,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:38,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:38,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:38,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:38,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:38,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:38,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:38,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:38,534 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:51:38,535 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:38,535 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256618321] [2021-11-02 22:51:38,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256618321] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:38,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322836586] [2021-11-02 22:51:38,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:38,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:38,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:38,538 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:38,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:51:38,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:38,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 22:51:38,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:39,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-02 22:51:39,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322836586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:39,171 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:51:39,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 8 [2021-11-02 22:51:39,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779306453] [2021-11-02 22:51:39,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:39,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:39,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:39,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:51:39,175 INFO L87 Difference]: Start difference. First operand 611 states and 748 transitions. Second operand has 8 states, 8 states have (on average 10.5) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-02 22:51:40,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:40,556 INFO L93 Difference]: Finished difference Result 1643 states and 2012 transitions. [2021-11-02 22:51:40,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:51:40,568 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 10.5) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 56 [2021-11-02 22:51:40,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:40,579 INFO L225 Difference]: With dead ends: 1643 [2021-11-02 22:51:40,579 INFO L226 Difference]: Without dead ends: 1643 [2021-11-02 22:51:40,580 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:51:40,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1643 states. [2021-11-02 22:51:40,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1643 to 904. [2021-11-02 22:51:40,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 904 states, 731 states have (on average 1.3036935704514363) internal successors, (953), 771 states have internal predecessors, (953), 74 states have call successors, (74), 58 states have call predecessors, (74), 74 states have return successors, (105), 74 states have call predecessors, (105), 73 states have call successors, (105) [2021-11-02 22:51:40,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1132 transitions. [2021-11-02 22:51:40,615 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1132 transitions. Word has length 56 [2021-11-02 22:51:40,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:40,616 INFO L470 AbstractCegarLoop]: Abstraction has 904 states and 1132 transitions. [2021-11-02 22:51:40,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 10.5) internal successors, (84), 6 states have internal predecessors, (84), 3 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-02 22:51:40,616 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1132 transitions. [2021-11-02 22:51:40,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 22:51:40,618 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:40,618 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] [2021-11-02 22:51:40,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:40,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:40,839 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:40,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:40,839 INFO L85 PathProgramCache]: Analyzing trace with hash -999983935, now seen corresponding path program 1 times [2021-11-02 22:51:40,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:40,840 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [356216257] [2021-11-02 22:51:40,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:40,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:40,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:40,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:40,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:40,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:40,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:41,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:41,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:41,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:41,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:41,162 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 22:51:41,163 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:41,163 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [356216257] [2021-11-02 22:51:41,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [356216257] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:41,164 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802388110] [2021-11-02 22:51:41,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:41,164 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:41,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:41,167 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:41,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:51:41,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:41,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:51:41,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:42,270 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 22:51:42,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802388110] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:42,271 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:51:42,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [12] total 17 [2021-11-02 22:51:42,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189313924] [2021-11-02 22:51:42,273 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:42,273 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:42,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:42,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:51:42,274 INFO L87 Difference]: Start difference. First operand 904 states and 1132 transitions. Second operand has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:51:42,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:42,639 INFO L93 Difference]: Finished difference Result 925 states and 1154 transitions. [2021-11-02 22:51:42,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:51:42,640 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 56 [2021-11-02 22:51:42,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:42,647 INFO L225 Difference]: With dead ends: 925 [2021-11-02 22:51:42,647 INFO L226 Difference]: Without dead ends: 925 [2021-11-02 22:51:42,648 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:51:42,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 925 states. [2021-11-02 22:51:42,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 925 to 906. [2021-11-02 22:51:42,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 906 states, 733 states have (on average 1.3042291950886766) internal successors, (956), 773 states have internal predecessors, (956), 74 states have call successors, (74), 58 states have call predecessors, (74), 74 states have return successors, (105), 74 states have call predecessors, (105), 73 states have call successors, (105) [2021-11-02 22:51:42,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 906 states to 906 states and 1135 transitions. [2021-11-02 22:51:42,676 INFO L78 Accepts]: Start accepts. Automaton has 906 states and 1135 transitions. Word has length 56 [2021-11-02 22:51:42,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:42,677 INFO L470 AbstractCegarLoop]: Abstraction has 906 states and 1135 transitions. [2021-11-02 22:51:42,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:51:42,677 INFO L276 IsEmpty]: Start isEmpty. Operand 906 states and 1135 transitions. [2021-11-02 22:51:42,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 22:51:42,681 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:42,681 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] [2021-11-02 22:51:42,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:42,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:51:42,897 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:42,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:42,897 INFO L85 PathProgramCache]: Analyzing trace with hash -999983873, now seen corresponding path program 1 times [2021-11-02 22:51:42,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:42,898 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374823076] [2021-11-02 22:51:42,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:42,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:42,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:43,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:43,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:43,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:43,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:43,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:43,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:43,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:43,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:43,252 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 22:51:43,252 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:43,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374823076] [2021-11-02 22:51:43,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [374823076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:43,253 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242756358] [2021-11-02 22:51:43,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:43,253 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:43,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:43,255 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:43,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:51:43,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:43,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:51:43,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:44,414 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 22:51:44,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242756358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:44,415 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:51:44,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [12] total 17 [2021-11-02 22:51:44,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074760067] [2021-11-02 22:51:44,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:51:44,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:44,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:51:44,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:51:44,419 INFO L87 Difference]: Start difference. First operand 906 states and 1135 transitions. Second operand has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:51:44,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:44,755 INFO L93 Difference]: Finished difference Result 924 states and 1152 transitions. [2021-11-02 22:51:44,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:51:44,755 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 56 [2021-11-02 22:51:44,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:44,761 INFO L225 Difference]: With dead ends: 924 [2021-11-02 22:51:44,762 INFO L226 Difference]: Without dead ends: 924 [2021-11-02 22:51:44,762 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:51:44,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 924 states. [2021-11-02 22:51:44,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 924 to 903. [2021-11-02 22:51:44,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 903 states, 731 states have (on average 1.3009575923392613) internal successors, (951), 770 states have internal predecessors, (951), 74 states have call successors, (74), 58 states have call predecessors, (74), 74 states have return successors, (105), 74 states have call predecessors, (105), 73 states have call successors, (105) [2021-11-02 22:51:44,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 903 states to 903 states and 1130 transitions. [2021-11-02 22:51:44,790 INFO L78 Accepts]: Start accepts. Automaton has 903 states and 1130 transitions. Word has length 56 [2021-11-02 22:51:44,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:44,790 INFO L470 AbstractCegarLoop]: Abstraction has 903 states and 1130 transitions. [2021-11-02 22:51:44,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 22:51:44,791 INFO L276 IsEmpty]: Start isEmpty. Operand 903 states and 1130 transitions. [2021-11-02 22:51:44,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-02 22:51:44,792 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:44,792 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] [2021-11-02 22:51:44,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:45,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-02 22:51:45,019 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting is_emptyErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:45,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:45,019 INFO L85 PathProgramCache]: Analyzing trace with hash 2069516378, now seen corresponding path program 1 times [2021-11-02 22:51:45,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:45,020 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900346481] [2021-11-02 22:51:45,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:45,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:45,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:45,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:45,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:45,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:45,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-11-02 22:51:45,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,469 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:51:45,470 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:45,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900346481] [2021-11-02 22:51:45,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900346481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:45,470 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963239681] [2021-11-02 22:51:45,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:45,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:45,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:45,472 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:45,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:51:45,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:45,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:51:45,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:46,826 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 22:51:46,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963239681] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:46,827 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:51:46,827 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [15] total 23 [2021-11-02 22:51:46,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521320984] [2021-11-02 22:51:46,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:51:46,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:46,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:51:46,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=495, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:51:46,831 INFO L87 Difference]: Start difference. First operand 903 states and 1130 transitions. Second operand has 11 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (8), 5 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 22:51:47,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:47,391 INFO L93 Difference]: Finished difference Result 896 states and 1102 transitions. [2021-11-02 22:51:47,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:51:47,392 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (8), 5 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 59 [2021-11-02 22:51:47,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:47,398 INFO L225 Difference]: With dead ends: 896 [2021-11-02 22:51:47,398 INFO L226 Difference]: Without dead ends: 896 [2021-11-02 22:51:47,399 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=132, Invalid=924, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:51:47,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 896 states. [2021-11-02 22:51:47,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 896 to 896. [2021-11-02 22:51:47,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 896 states, 729 states have (on average 1.2661179698216736) internal successors, (923), 763 states have internal predecessors, (923), 74 states have call successors, (74), 58 states have call predecessors, (74), 74 states have return successors, (105), 74 states have call predecessors, (105), 73 states have call successors, (105) [2021-11-02 22:51:47,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 896 states to 896 states and 1102 transitions. [2021-11-02 22:51:47,425 INFO L78 Accepts]: Start accepts. Automaton has 896 states and 1102 transitions. Word has length 59 [2021-11-02 22:51:47,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:47,425 INFO L470 AbstractCegarLoop]: Abstraction has 896 states and 1102 transitions. [2021-11-02 22:51:47,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 5.111111111111111) internal successors, (46), 8 states have internal predecessors, (46), 5 states have call successors, (8), 5 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 22:51:47,426 INFO L276 IsEmpty]: Start isEmpty. Operand 896 states and 1102 transitions. [2021-11-02 22:51:47,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-02 22:51:47,427 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:47,428 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] [2021-11-02 22:51:47,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:51:47,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:51:47,647 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:47,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:47,648 INFO L85 PathProgramCache]: Analyzing trace with hash -628070452, now seen corresponding path program 1 times [2021-11-02 22:51:47,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:47,648 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912075714] [2021-11-02 22:51:47,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:47,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:47,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:47,862 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:47,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:47,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:47,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:47,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:47,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:48,327 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:48,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:48,904 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 22:51:48,904 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:48,904 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912075714] [2021-11-02 22:51:48,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912075714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:51:48,904 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:51:48,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2021-11-02 22:51:48,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250506911] [2021-11-02 22:51:48,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:51:48,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:51:48,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:51:48,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:51:48,906 INFO L87 Difference]: Start difference. First operand 896 states and 1102 transitions. Second operand has 18 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 15 states have internal predecessors, (50), 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 22:51:51,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:51:51,792 INFO L93 Difference]: Finished difference Result 1061 states and 1320 transitions. [2021-11-02 22:51:51,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:51:51,793 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 15 states have internal predecessors, (50), 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 59 [2021-11-02 22:51:51,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:51:51,804 INFO L225 Difference]: With dead ends: 1061 [2021-11-02 22:51:51,804 INFO L226 Difference]: Without dead ends: 1061 [2021-11-02 22:51:51,805 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=178, Invalid=1154, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:51:51,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1061 states. [2021-11-02 22:51:51,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1061 to 920. [2021-11-02 22:51:51,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 920 states, 749 states have (on average 1.2643524699599467) internal successors, (947), 785 states have internal predecessors, (947), 74 states have call successors, (74), 58 states have call predecessors, (74), 78 states have return successors, (110), 76 states have call predecessors, (110), 73 states have call successors, (110) [2021-11-02 22:51:51,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 920 states to 920 states and 1131 transitions. [2021-11-02 22:51:51,854 INFO L78 Accepts]: Start accepts. Automaton has 920 states and 1131 transitions. Word has length 59 [2021-11-02 22:51:51,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:51:51,855 INFO L470 AbstractCegarLoop]: Abstraction has 920 states and 1131 transitions. [2021-11-02 22:51:51,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 15 states have internal predecessors, (50), 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 22:51:51,855 INFO L276 IsEmpty]: Start isEmpty. Operand 920 states and 1131 transitions. [2021-11-02 22:51:51,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:51:51,860 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:51:51,860 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] [2021-11-02 22:51:51,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2021-11-02 22:51:51,860 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 22:51:51,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:51:51,861 INFO L85 PathProgramCache]: Analyzing trace with hash 1568077414, now seen corresponding path program 1 times [2021-11-02 22:51:51,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:51:51,862 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55962399] [2021-11-02 22:51:51,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:51,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:51:51,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:52,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:51:52,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:52,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 22:51:52,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:52,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 22:51:52,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:52,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 22:51:52,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:52,760 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 22:51:52,760 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:51:52,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55962399] [2021-11-02 22:51:52,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55962399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:51:52,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430479721] [2021-11-02 22:51:52,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:51:52,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:51:52,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:51:52,763 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:51:52,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:51:53,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:51:53,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-02 22:51:53,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:51:53,802 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 22:51:53,836 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 22:51:54,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-02 22:52:51,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:52:52,031 INFO L354 Elim1Store]: treesize reduction 883, result has 11.1 percent of original size [2021-11-02 22:52:52,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 8 case distinctions, treesize of input 182 treesize of output 213 [2021-11-02 22:52:52,097 INFO L354 Elim1Store]: treesize reduction 208, result has 19.1 percent of original size [2021-11-02 22:52:52,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 213 treesize of output 242 [2021-11-02 22:52:52,105 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-02 22:52:52,106 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 242 treesize of output 232 [2021-11-02 22:52:52,114 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-02 22:52:52,114 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 232 treesize of output 222 [2021-11-02 22:52:52,127 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:52:52,128 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 245 treesize of output 237 [2021-11-02 22:52:52,148 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:52:52,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 237 treesize of output 265 [2021-11-02 22:52:52,168 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:52:52,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 265 treesize of output 293 [2021-11-02 22:52:52,174 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:52:52,175 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 316 treesize of output 308 [2021-11-02 22:52:52,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:52:52,944 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:52:52,945 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 47 treesize of output 17 [2021-11-02 22:52:52,956 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 22:52:52,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430479721] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:52:52,956 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:52:52,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 37 [2021-11-02 22:52:52,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690046869] [2021-11-02 22:52:52,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:52:52,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:52:52,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:52:52,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1288, Unknown=18, NotChecked=0, Total=1406 [2021-11-02 22:52:52,958 INFO L87 Difference]: Start difference. First operand 920 states and 1131 transitions. Second operand has 38 states, 36 states have (on average 2.75) internal successors, (99), 33 states have internal predecessors, (99), 5 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 22:54:56,137 WARN L207 SmtUtils]: Spent 6.38 s on a formula simplification that was a NOOP. DAG size: 104 [2021-11-02 22:56:04,269 WARN L207 SmtUtils]: Spent 10.18 s on a formula simplification. DAG size of input: 101 DAG size of output: 86 [2021-11-02 22:59:34,723 WARN L207 SmtUtils]: Spent 6.42 s on a formula simplification that was a NOOP. DAG size: 102 [2021-11-02 23:00:26,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:26,232 INFO L93 Difference]: Finished difference Result 1465 states and 1811 transitions. [2021-11-02 23:00:26,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-02 23:00:26,233 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 2.75) internal successors, (99), 33 states have internal predecessors, (99), 5 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) Word has length 60 [2021-11-02 23:00:26,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:26,243 INFO L225 Difference]: With dead ends: 1465 [2021-11-02 23:00:26,243 INFO L226 Difference]: Without dead ends: 1461 [2021-11-02 23:00:26,248 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3276 ImplicationChecksByTransitivity, 326.4s TimeCoverageRelationStatistics Valid=836, Invalid=10182, Unknown=112, NotChecked=0, Total=11130 [2021-11-02 23:00:26,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1461 states. [2021-11-02 23:00:26,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1461 to 1121. [2021-11-02 23:00:26,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1121 states, 914 states have (on average 1.2691466083150984) internal successors, (1160), 952 states have internal predecessors, (1160), 95 states have call successors, (95), 70 states have call predecessors, (95), 94 states have return successors, (145), 98 states have call predecessors, (145), 94 states have call successors, (145) [2021-11-02 23:00:26,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1121 states to 1121 states and 1400 transitions. [2021-11-02 23:00:26,296 INFO L78 Accepts]: Start accepts. Automaton has 1121 states and 1400 transitions. Word has length 60 [2021-11-02 23:00:26,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:26,297 INFO L470 AbstractCegarLoop]: Abstraction has 1121 states and 1400 transitions. [2021-11-02 23:00:26,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 2.75) internal successors, (99), 33 states have internal predecessors, (99), 5 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 23:00:26,298 INFO L276 IsEmpty]: Start isEmpty. Operand 1121 states and 1400 transitions. [2021-11-02 23:00:26,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 23:00:26,299 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:26,300 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] [2021-11-02 23:00:26,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 23:00:26,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:26,515 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting mainErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:26,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:26,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1568077415, now seen corresponding path program 1 times [2021-11-02 23:00:26,516 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:26,516 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568091332] [2021-11-02 23:00:26,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:26,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:26,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:26,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:26,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:26,885 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 23:00:26,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:26,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 23:00:26,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:27,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 23:00:27,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:27,635 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 23:00:27,636 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:27,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568091332] [2021-11-02 23:00:27,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568091332] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:00:27,636 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:00:27,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2021-11-02 23:00:27,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671301562] [2021-11-02 23:00:27,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 23:00:27,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:27,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 23:00:27,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2021-11-02 23:00:27,639 INFO L87 Difference]: Start difference. First operand 1121 states and 1400 transitions. Second operand has 22 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 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 23:00:31,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:31,580 INFO L93 Difference]: Finished difference Result 1492 states and 1872 transitions. [2021-11-02 23:00:31,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-02 23:00:31,591 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 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 60 [2021-11-02 23:00:31,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:31,601 INFO L225 Difference]: With dead ends: 1492 [2021-11-02 23:00:31,602 INFO L226 Difference]: Without dead ends: 1492 [2021-11-02 23:00:31,603 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=300, Invalid=2250, Unknown=0, NotChecked=0, Total=2550 [2021-11-02 23:00:31,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-11-02 23:00:31,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 1260. [2021-11-02 23:00:31,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1260 states, 1030 states have (on average 1.2766990291262137) internal successors, (1315), 1071 states have internal predecessors, (1315), 104 states have call successors, (104), 78 states have call predecessors, (104), 110 states have return successors, (176), 110 states have call predecessors, (176), 103 states have call successors, (176) [2021-11-02 23:00:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1260 states to 1260 states and 1595 transitions. [2021-11-02 23:00:31,641 INFO L78 Accepts]: Start accepts. Automaton has 1260 states and 1595 transitions. Word has length 60 [2021-11-02 23:00:31,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:31,641 INFO L470 AbstractCegarLoop]: Abstraction has 1260 states and 1595 transitions. [2021-11-02 23:00:31,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 2.55) internal successors, (51), 18 states have internal predecessors, (51), 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 23:00:31,642 INFO L276 IsEmpty]: Start isEmpty. Operand 1260 states and 1595 transitions. [2021-11-02 23:00:31,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 23:00:31,644 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:31,644 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] [2021-11-02 23:00:31,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2021-11-02 23:00:31,644 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting mainErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:31,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:31,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1569924457, now seen corresponding path program 1 times [2021-11-02 23:00:31,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:31,645 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449441496] [2021-11-02 23:00:31,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:31,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:31,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:31,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:31,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:31,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 23:00:31,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:31,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 23:00:31,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:32,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 23:00:32,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:32,294 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 23:00:32,294 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:32,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449441496] [2021-11-02 23:00:32,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449441496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:00:32,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153943444] [2021-11-02 23:00:32,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:32,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:32,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:00:32,296 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:00:32,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 23:00:33,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:33,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-02 23:00:33,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:00:33,220 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 23:00:33,840 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 46 treesize of output 42 [2021-11-02 23:00:33,844 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 39 treesize of output 35 [2021-11-02 23:00:34,526 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-02 23:00:34,527 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 60 treesize of output 47 [2021-11-02 23:00:34,542 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-02 23:00:34,542 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 41 treesize of output 28 [2021-11-02 23:00:34,604 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 23:00:34,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153943444] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:00:34,605 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 23:00:34,605 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [15] total 26 [2021-11-02 23:00:34,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605672044] [2021-11-02 23:00:34,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 23:00:34,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:34,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 23:00:34,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2021-11-02 23:00:34,609 INFO L87 Difference]: Start difference. First operand 1260 states and 1595 transitions. Second operand has 15 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 3 states have call successors, (5), 2 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 23:00:35,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:35,957 INFO L93 Difference]: Finished difference Result 1664 states and 2126 transitions. [2021-11-02 23:00:35,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 23:00:35,958 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 3 states have call successors, (5), 2 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 60 [2021-11-02 23:00:35,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:35,973 INFO L225 Difference]: With dead ends: 1664 [2021-11-02 23:00:35,974 INFO L226 Difference]: Without dead ends: 1664 [2021-11-02 23:00:35,981 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=148, Invalid=1042, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 23:00:35,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1664 states. [2021-11-02 23:00:36,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1664 to 1512. [2021-11-02 23:00:36,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1512 states, 1236 states have (on average 1.2831715210355987) internal successors, (1586), 1280 states have internal predecessors, (1586), 130 states have call successors, (130), 95 states have call predecessors, (130), 132 states have return successors, (228), 136 states have call predecessors, (228), 129 states have call successors, (228) [2021-11-02 23:00:36,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 1944 transitions. [2021-11-02 23:00:36,031 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 1944 transitions. Word has length 60 [2021-11-02 23:00:36,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:36,034 INFO L470 AbstractCegarLoop]: Abstraction has 1512 states and 1944 transitions. [2021-11-02 23:00:36,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 3 states have call successors, (5), 2 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 23:00:36,034 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 1944 transitions. [2021-11-02 23:00:36,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 23:00:36,036 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:36,036 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] [2021-11-02 23:00:36,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 23:00:36,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-02 23:00:36,251 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:36,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:36,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1065444960, now seen corresponding path program 1 times [2021-11-02 23:00:36,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:36,251 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257538122] [2021-11-02 23:00:36,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:36,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:36,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:36,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:36,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:36,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:00:36,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:36,341 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 23:00:36,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:36,360 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 23:00:36,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:36,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 23:00:36,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:36,403 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 23:00:36,404 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:36,404 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257538122] [2021-11-02 23:00:36,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257538122] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:00:36,404 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:00:36,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 23:00:36,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105967135] [2021-11-02 23:00:36,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 23:00:36,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:36,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 23:00:36,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:00:36,406 INFO L87 Difference]: Start difference. First operand 1512 states and 1944 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 23:00:37,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:37,071 INFO L93 Difference]: Finished difference Result 1382 states and 1769 transitions. [2021-11-02 23:00:37,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:00:37,072 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 23:00:37,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:37,086 INFO L225 Difference]: With dead ends: 1382 [2021-11-02 23:00:37,086 INFO L226 Difference]: Without dead ends: 1358 [2021-11-02 23:00:37,087 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 23:00:37,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1358 states. [2021-11-02 23:00:37,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1358 to 1149. [2021-11-02 23:00:37,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1149 states, 937 states have (on average 1.2764140875133405) internal successors, (1196), 976 states have internal predecessors, (1196), 96 states have call successors, (96), 72 states have call predecessors, (96), 96 states have return successors, (152), 100 states have call predecessors, (152), 95 states have call successors, (152) [2021-11-02 23:00:37,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1149 states to 1149 states and 1444 transitions. [2021-11-02 23:00:37,117 INFO L78 Accepts]: Start accepts. Automaton has 1149 states and 1444 transitions. Word has length 62 [2021-11-02 23:00:37,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:37,117 INFO L470 AbstractCegarLoop]: Abstraction has 1149 states and 1444 transitions. [2021-11-02 23:00:37,117 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 23:00:37,118 INFO L276 IsEmpty]: Start isEmpty. Operand 1149 states and 1444 transitions. [2021-11-02 23:00:37,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-02 23:00:37,119 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:37,120 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] [2021-11-02 23:00:37,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2021-11-02 23:00:37,120 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:37,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:37,121 INFO L85 PathProgramCache]: Analyzing trace with hash 1365758286, now seen corresponding path program 1 times [2021-11-02 23:00:37,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:37,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557034630] [2021-11-02 23:00:37,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:37,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:37,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:37,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:37,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:37,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 23:00:37,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:37,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 23:00:37,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:37,268 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 23:00:37,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:37,275 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 23:00:37,276 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:37,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557034630] [2021-11-02 23:00:37,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557034630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:00:37,276 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663904630] [2021-11-02 23:00:37,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:37,277 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:37,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:00:37,278 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:00:37,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 23:00:38,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:38,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-02 23:00:38,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:00:38,345 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 23:00:38,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663904630] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:00:38,345 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 23:00:38,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 7 [2021-11-02 23:00:38,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236691317] [2021-11-02 23:00:38,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 23:00:38,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:38,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 23:00:38,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:00:38,347 INFO L87 Difference]: Start difference. First operand 1149 states and 1444 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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 23:00:38,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:38,390 INFO L93 Difference]: Finished difference Result 1305 states and 1684 transitions. [2021-11-02 23:00:38,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 23:00:38,391 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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 61 [2021-11-02 23:00:38,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:38,397 INFO L225 Difference]: With dead ends: 1305 [2021-11-02 23:00:38,397 INFO L226 Difference]: Without dead ends: 1305 [2021-11-02 23:00:38,398 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 67 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 23:00:38,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1305 states. [2021-11-02 23:00:38,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1305 to 1291. [2021-11-02 23:00:38,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1291 states, 1063 states have (on average 1.2793979303857008) internal successors, (1360), 1098 states have internal predecessors, (1360), 112 states have call successors, (112), 72 states have call predecessors, (112), 96 states have return successors, (190), 120 states have call predecessors, (190), 111 states have call successors, (190) [2021-11-02 23:00:38,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1291 states to 1291 states and 1662 transitions. [2021-11-02 23:00:38,438 INFO L78 Accepts]: Start accepts. Automaton has 1291 states and 1662 transitions. Word has length 61 [2021-11-02 23:00:38,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:38,438 INFO L470 AbstractCegarLoop]: Abstraction has 1291 states and 1662 transitions. [2021-11-02 23:00:38,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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 23:00:38,439 INFO L276 IsEmpty]: Start isEmpty. Operand 1291 states and 1662 transitions. [2021-11-02 23:00:38,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-02 23:00:38,440 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:38,441 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] [2021-11-02 23:00:38,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 23:00:38,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:38,667 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:38,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:38,667 INFO L85 PathProgramCache]: Analyzing trace with hash 538196246, now seen corresponding path program 1 times [2021-11-02 23:00:38,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:38,667 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187847787] [2021-11-02 23:00:38,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:38,668 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:38,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:38,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:38,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:38,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 23:00:38,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:38,863 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 23:00:38,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:38,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 23:00:39,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:39,071 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 23:00:39,072 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:39,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187847787] [2021-11-02 23:00:39,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187847787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:00:39,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887610693] [2021-11-02 23:00:39,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:39,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:39,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:00:39,087 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:00:39,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 23:00:39,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:39,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 23:00:39,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:00:40,075 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 23:00:40,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2021-11-02 23:00:41,157 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-02 23:00:41,157 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 38 treesize of output 25 [2021-11-02 23:00:41,184 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 23:00:41,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887610693] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:00:41,184 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 23:00:41,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [15] total 26 [2021-11-02 23:00:41,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680437959] [2021-11-02 23:00:41,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 23:00:41,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:41,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 23:00:41,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=624, Unknown=0, NotChecked=0, Total=702 [2021-11-02 23:00:41,186 INFO L87 Difference]: Start difference. First operand 1291 states and 1662 transitions. Second operand has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 3 states have call successors, (5), 2 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 23:00:42,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:42,486 INFO L93 Difference]: Finished difference Result 1469 states and 1884 transitions. [2021-11-02 23:00:42,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 23:00:42,488 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 3 states have call successors, (5), 2 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 61 [2021-11-02 23:00:42,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:42,492 INFO L225 Difference]: With dead ends: 1469 [2021-11-02 23:00:42,493 INFO L226 Difference]: Without dead ends: 1469 [2021-11-02 23:00:42,494 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=158, Invalid=1174, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 23:00:42,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2021-11-02 23:00:42,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 1225. [2021-11-02 23:00:42,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1225 states, 1009 states have (on average 1.2824578790882062) internal successors, (1294), 1043 states have internal predecessors, (1294), 103 states have call successors, (103), 69 states have call predecessors, (103), 93 states have return successors, (170), 112 states have call predecessors, (170), 102 states have call successors, (170) [2021-11-02 23:00:42,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1225 states to 1225 states and 1567 transitions. [2021-11-02 23:00:42,528 INFO L78 Accepts]: Start accepts. Automaton has 1225 states and 1567 transitions. Word has length 61 [2021-11-02 23:00:42,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:42,528 INFO L470 AbstractCegarLoop]: Abstraction has 1225 states and 1567 transitions. [2021-11-02 23:00:42,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 13 states have internal predecessors, (52), 3 states have call successors, (5), 2 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 23:00:42,529 INFO L276 IsEmpty]: Start isEmpty. Operand 1225 states and 1567 transitions. [2021-11-02 23:00:42,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-02 23:00:42,530 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:42,531 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 23:00:42,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 23:00:42,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-02 23:00:42,747 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:42,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:42,747 INFO L85 PathProgramCache]: Analyzing trace with hash -142092017, now seen corresponding path program 1 times [2021-11-02 23:00:42,748 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:42,748 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734853266] [2021-11-02 23:00:42,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:42,748 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:42,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:42,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:42,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:42,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:00:42,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:42,866 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 23:00:42,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:42,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 23:00:42,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:42,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 23:00:42,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:42,954 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 23:00:42,954 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:42,955 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734853266] [2021-11-02 23:00:42,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734853266] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 23:00:42,955 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:00:42,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-02 23:00:42,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992507941] [2021-11-02 23:00:42,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 23:00:42,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:42,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 23:00:42,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-02 23:00:42,957 INFO L87 Difference]: Start difference. First operand 1225 states and 1567 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 23:00:44,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:44,145 INFO L93 Difference]: Finished difference Result 1870 states and 2444 transitions. [2021-11-02 23:00:44,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 23:00:44,146 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 63 [2021-11-02 23:00:44,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:44,153 INFO L225 Difference]: With dead ends: 1870 [2021-11-02 23:00:44,154 INFO L226 Difference]: Without dead ends: 1870 [2021-11-02 23:00:44,154 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=148, Invalid=452, Unknown=0, NotChecked=0, Total=600 [2021-11-02 23:00:44,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1870 states. [2021-11-02 23:00:44,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1870 to 1612. [2021-11-02 23:00:44,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1612 states, 1319 states have (on average 1.282789992418499) internal successors, (1692), 1367 states have internal predecessors, (1692), 141 states have call successors, (141), 95 states have call predecessors, (141), 132 states have return successors, (275), 149 states have call predecessors, (275), 140 states have call successors, (275) [2021-11-02 23:00:44,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1612 states to 1612 states and 2108 transitions. [2021-11-02 23:00:44,201 INFO L78 Accepts]: Start accepts. Automaton has 1612 states and 2108 transitions. Word has length 63 [2021-11-02 23:00:44,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:44,202 INFO L470 AbstractCegarLoop]: Abstraction has 1612 states and 2108 transitions. [2021-11-02 23:00:44,202 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 23:00:44,202 INFO L276 IsEmpty]: Start isEmpty. Operand 1612 states and 2108 transitions. [2021-11-02 23:00:44,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 23:00:44,205 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:44,205 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:00:44,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2021-11-02 23:00:44,205 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting is_emptyErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:44,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:44,206 INFO L85 PathProgramCache]: Analyzing trace with hash 177296810, now seen corresponding path program 1 times [2021-11-02 23:00:44,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:44,206 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813786424] [2021-11-02 23:00:44,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:44,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:44,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:44,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,328 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-11-02 23:00:44,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 23:00:44,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-11-02 23:00:44,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,422 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-11-02 23:00:44,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-11-02 23:00:44,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:44,450 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-02 23:00:44,450 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:44,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813786424] [2021-11-02 23:00:44,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813786424] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:00:44,451 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353986516] [2021-11-02 23:00:44,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:44,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:44,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:00:44,453 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:00:44,478 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 23:00:45,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:45,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 23:00:45,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:00:45,444 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 23:00:45,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353986516] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:00:45,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:00:45,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5] total 16 [2021-11-02 23:00:45,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210343674] [2021-11-02 23:00:45,445 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-02 23:00:45,445 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:00:45,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-02 23:00:45,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-11-02 23:00:45,447 INFO L87 Difference]: Start difference. First operand 1612 states and 2108 transitions. Second operand has 16 states, 15 states have (on average 5.266666666666667) internal successors, (79), 11 states have internal predecessors, (79), 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 23:00:47,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:00:47,487 INFO L93 Difference]: Finished difference Result 1883 states and 2450 transitions. [2021-11-02 23:00:47,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 23:00:47,487 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 5.266666666666667) internal successors, (79), 11 states have internal predecessors, (79), 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 66 [2021-11-02 23:00:47,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:00:47,510 INFO L225 Difference]: With dead ends: 1883 [2021-11-02 23:00:47,510 INFO L226 Difference]: Without dead ends: 1871 [2021-11-02 23:00:47,511 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=231, Invalid=1101, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 23:00:47,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1871 states. [2021-11-02 23:00:47,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1871 to 1618. [2021-11-02 23:00:47,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1618 states, 1325 states have (on average 1.2754716981132075) internal successors, (1690), 1373 states have internal predecessors, (1690), 141 states have call successors, (141), 95 states have call predecessors, (141), 132 states have return successors, (275), 149 states have call predecessors, (275), 140 states have call successors, (275) [2021-11-02 23:00:47,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1618 states to 1618 states and 2106 transitions. [2021-11-02 23:00:47,557 INFO L78 Accepts]: Start accepts. Automaton has 1618 states and 2106 transitions. Word has length 66 [2021-11-02 23:00:47,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:00:47,558 INFO L470 AbstractCegarLoop]: Abstraction has 1618 states and 2106 transitions. [2021-11-02 23:00:47,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 5.266666666666667) internal successors, (79), 11 states have internal predecessors, (79), 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 23:00:47,558 INFO L276 IsEmpty]: Start isEmpty. Operand 1618 states and 2106 transitions. [2021-11-02 23:00:47,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-02 23:00:47,560 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:00:47,560 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 23:00:47,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 23:00:47,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-02 23:00:47,775 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting mainErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:00:47,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:00:47,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1764823566, now seen corresponding path program 1 times [2021-11-02 23:00:47,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 23:00:47,776 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012847496] [2021-11-02 23:00:47,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:47,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 23:00:47,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:48,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 23:00:48,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:48,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-11-02 23:00:48,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:48,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-11-02 23:00:48,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:48,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-11-02 23:00:48,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:48,725 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 23:00:48,726 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 23:00:48,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012847496] [2021-11-02 23:00:48,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012847496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:00:48,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363257283] [2021-11-02 23:00:48,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:00:48,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 23:00:48,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:00:48,728 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 23:00:48,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 23:00:49,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:00:49,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-02 23:00:49,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:00:49,738 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 23:01:22,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:01:22,209 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 148 treesize of output 147 [2021-11-02 23:01:31,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:01:31,349 INFO L354 Elim1Store]: treesize reduction 870, result has 12.4 percent of original size [2021-11-02 23:01:31,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 8 case distinctions, treesize of input 140 treesize of output 184 [2021-11-02 23:01:31,359 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-02 23:01:31,360 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 191 treesize of output 181 [2021-11-02 23:01:31,383 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:01:31,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 181 treesize of output 209 [2021-11-02 23:01:31,392 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:01:31,393 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 235 treesize of output 227 [2021-11-02 23:01:33,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:01:33,244 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:01:33,262 INFO L354 Elim1Store]: treesize reduction 24, result has 36.8 percent of original size [2021-11-02 23:01:33,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 88 treesize of output 67 [2021-11-02 23:01:33,266 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 61 treesize of output 49 [2021-11-02 23:01:33,749 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 23:01:33,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363257283] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 23:01:33,750 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 23:01:33,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 21] total 39 [2021-11-02 23:01:33,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242557565] [2021-11-02 23:01:33,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-02 23:01:33,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 23:01:33,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-02 23:01:33,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1445, Unknown=17, NotChecked=0, Total=1560 [2021-11-02 23:01:33,753 INFO L87 Difference]: Start difference. First operand 1618 states and 2106 transitions. Second operand has 40 states, 38 states have (on average 2.8421052631578947) internal successors, (108), 35 states have internal predecessors, (108), 5 states have call successors, (10), 6 states have call predecessors, (10), 7 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-02 23:03:16,142 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-02 23:03:16,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-02 23:03:16,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:16,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-02 23:03:16,360 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:158) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.pop(Scriptor.java:139) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.pop(DiffWrapperScript.java:99) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.pop(WrapperScript.java:153) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.pop(HistoryRecordingScript.java:117) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.pop(ManagedScript.java:128) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.unAssertPostcondition(IncrementalHoareTripleChecker.java:662) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.clearAssertionStack(IncrementalHoareTripleChecker.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.releaseLock(IncrementalHoareTripleChecker.java:281) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ProtectiveHoareTripleChecker.releaseLock(ProtectiveHoareTripleChecker.java:93) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.EfficientHoareTripleChecker.releaseLock(EfficientHoareTripleChecker.java:162) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.releaseLock(CachingHoareTripleChecker.java:201) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.switchToReadonlyMode(AbstractInterpolantAutomaton.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:886) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:783) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Broken pipe at java.base/java.io.FileOutputStream.writeBytes(Native Method) at java.base/java.io.FileOutputStream.write(FileOutputStream.java:354) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:156) ... 35 more [2021-11-02 23:03:16,365 INFO L168 Benchmark]: Toolchain (without parser) took 746933.69 ms. Allocated memory was 109.1 MB in the beginning and 268.4 MB in the end (delta: 159.4 MB). Free memory was 68.5 MB in the beginning and 79.4 MB in the end (delta: -10.9 MB). Peak memory consumption was 148.2 MB. Max. memory is 16.1 GB. [2021-11-02 23:03:16,365 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 109.1 MB. Free memory is still 87.0 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-02 23:03:16,366 INFO L168 Benchmark]: CACSL2BoogieTranslator took 589.79 ms. Allocated memory is still 109.1 MB. Free memory was 68.3 MB in the beginning and 73.2 MB in the end (delta: -4.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-02 23:03:16,367 INFO L168 Benchmark]: Boogie Preprocessor took 86.26 ms. Allocated memory is still 109.1 MB. Free memory was 73.2 MB in the beginning and 69.4 MB in the end (delta: 3.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-02 23:03:16,367 INFO L168 Benchmark]: RCFGBuilder took 1096.69 ms. Allocated memory was 109.1 MB in the beginning and 148.9 MB in the end (delta: 39.8 MB). Free memory was 69.4 MB in the beginning and 112.3 MB in the end (delta: -42.9 MB). Peak memory consumption was 31.8 MB. Max. memory is 16.1 GB. [2021-11-02 23:03:16,368 INFO L168 Benchmark]: TraceAbstraction took 745155.43 ms. Allocated memory was 148.9 MB in the beginning and 268.4 MB in the end (delta: 119.5 MB). Free memory was 112.3 MB in the beginning and 79.4 MB in the end (delta: 32.9 MB). Peak memory consumption was 153.9 MB. Max. memory is 16.1 GB. [2021-11-02 23:03:16,371 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 109.1 MB. Free memory is still 87.0 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 589.79 ms. Allocated memory is still 109.1 MB. Free memory was 68.3 MB in the beginning and 73.2 MB in the end (delta: -4.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 86.26 ms. Allocated memory is still 109.1 MB. Free memory was 73.2 MB in the beginning and 69.4 MB in the end (delta: 3.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 1096.69 ms. Allocated memory was 109.1 MB in the beginning and 148.9 MB in the end (delta: 39.8 MB). Free memory was 69.4 MB in the beginning and 112.3 MB in the end (delta: -42.9 MB). Peak memory consumption was 31.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 745155.43 ms. Allocated memory was 148.9 MB in the beginning and 268.4 MB in the end (delta: 119.5 MB). Free memory was 112.3 MB in the beginning and 79.4 MB in the end (delta: 32.9 MB). Peak memory consumption was 153.9 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken: de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:312) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/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_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/test-0214_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/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 8cac36e956b24d42ea840a07609fb159882a2e76b1195da25a4d4343e0b31026 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 23:03:19,142 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 23:03:19,147 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 23:03:19,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 23:03:19,218 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 23:03:19,224 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 23:03:19,227 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 23:03:19,236 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 23:03:19,238 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 23:03:19,240 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 23:03:19,242 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 23:03:19,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 23:03:19,245 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 23:03:19,254 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 23:03:19,256 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 23:03:19,258 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 23:03:19,259 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 23:03:19,260 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 23:03:19,271 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 23:03:19,274 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 23:03:19,277 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 23:03:19,279 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 23:03:19,281 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 23:03:19,282 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 23:03:19,287 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 23:03:19,296 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 23:03:19,297 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 23:03:19,298 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 23:03:19,299 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 23:03:19,301 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 23:03:19,301 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 23:03:19,303 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 23:03:19,304 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 23:03:19,307 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 23:03:19,309 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 23:03:19,310 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 23:03:19,311 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 23:03:19,312 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 23:03:19,313 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 23:03:19,314 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 23:03:19,317 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 23:03:19,321 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2021-11-02 23:03:19,375 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 23:03:19,376 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 23:03:19,377 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 23:03:19,377 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 23:03:19,380 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 23:03:19,381 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 23:03:19,381 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 23:03:19,381 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 23:03:19,382 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 23:03:19,382 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 23:03:19,383 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 23:03:19,384 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 23:03:19,384 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 23:03:19,385 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 23:03:19,385 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 23:03:19,385 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 23:03:19,386 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 23:03:19,386 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 23:03:19,386 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-02 23:03:19,386 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-02 23:03:19,387 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 23:03:19,387 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 23:03:19,387 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 23:03:19,388 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 23:03:19,388 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 23:03:19,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 23:03:19,389 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 23:03:19,389 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 23:03:19,389 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2021-11-02 23:03:19,390 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-02 23:03:19,390 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 23:03:19,390 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-02 23:03:19,391 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8cac36e956b24d42ea840a07609fb159882a2e76b1195da25a4d4343e0b31026 [2021-11-02 23:03:19,899 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 23:03:19,929 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 23:03:19,932 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 23:03:19,933 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 23:03:19,935 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 23:03:19,937 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/list-ext-properties/test-0214_1.i [2021-11-02 23:03:20,026 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/8c3bae9a7/03f5b1566fcf417ba4917482e73523ac/FLAG1010761c3 [2021-11-02 23:03:20,807 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 23:03:20,807 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/sv-benchmarks/c/list-ext-properties/test-0214_1.i [2021-11-02 23:03:20,830 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/8c3bae9a7/03f5b1566fcf417ba4917482e73523ac/FLAG1010761c3 [2021-11-02 23:03:21,035 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/data/8c3bae9a7/03f5b1566fcf417ba4917482e73523ac [2021-11-02 23:03:21,038 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 23:03:21,041 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 23:03:21,044 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 23:03:21,045 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 23:03:21,050 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 23:03:21,051 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:03:21" (1/1) ... [2021-11-02 23:03:21,053 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f3450b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:21, skipping insertion in model container [2021-11-02 23:03:21,053 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:03:21" (1/1) ... [2021-11-02 23:03:21,063 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 23:03:21,163 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 23:03:21,828 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 23:03:21,853 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 23:03:21,966 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 23:03:22,030 INFO L208 MainTranslator]: Completed translation [2021-11-02 23:03:22,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22 WrapperNode [2021-11-02 23:03:22,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 23:03:22,033 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 23:03:22,033 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 23:03:22,033 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 23:03:22,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,049 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,076 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,076 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,132 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,150 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,190 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 23:03:22,201 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 23:03:22,202 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 23:03:22,202 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 23:03:22,203 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (1/1) ... [2021-11-02 23:03:22,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 23:03:22,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 23:03:22,240 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 23:03:22,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 23:03:22,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 23:03:22,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 23:03:22,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.setCurrentRoundingMode [2021-11-02 23:03:22,324 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-11-02 23:03:22,325 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 23:03:22,325 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 23:03:22,325 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-02 23:03:22,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-02 23:03:22,327 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-02 23:03:22,327 INFO L138 BoogieDeclarations]: Found implementation of procedure is_empty [2021-11-02 23:03:22,327 INFO L138 BoogieDeclarations]: Found implementation of procedure abort [2021-11-02 23:03:22,328 INFO L138 BoogieDeclarations]: Found implementation of procedure create_item [2021-11-02 23:03:22,328 INFO L138 BoogieDeclarations]: Found implementation of procedure append_one [2021-11-02 23:03:22,328 INFO L138 BoogieDeclarations]: Found implementation of procedure remove_one [2021-11-02 23:03:22,328 INFO L138 BoogieDeclarations]: Found implementation of procedure rand_end_point [2021-11-02 23:03:22,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 23:03:22,329 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2021-11-02 23:03:22,329 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 23:03:22,329 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-11-02 23:03:22,329 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-11-02 23:03:22,330 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-11-02 23:03:22,330 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-11-02 23:03:22,330 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 23:03:22,330 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 23:03:22,331 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 23:03:22,331 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 23:03:22,331 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 23:03:22,331 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 23:03:22,331 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 23:03:22,332 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 23:03:22,332 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 23:03:22,332 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 23:03:22,332 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 23:03:22,333 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 23:03:22,333 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 23:03:22,333 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 23:03:22,333 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 23:03:22,334 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 23:03:22,334 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 23:03:22,334 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 23:03:22,334 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 23:03:22,334 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-02 23:03:22,335 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-02 23:03:22,335 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-02 23:03:22,335 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 23:03:22,335 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 23:03:22,336 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 23:03:22,337 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 23:03:22,337 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 23:03:22,338 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 23:03:22,338 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 23:03:22,338 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 23:03:22,339 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 23:03:22,339 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 23:03:22,339 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 23:03:22,339 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 23:03:22,340 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 23:03:22,340 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 23:03:22,340 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 23:03:22,341 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 23:03:22,341 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 23:03:22,341 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 23:03:22,341 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 23:03:22,342 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 23:03:22,342 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 23:03:22,343 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 23:03:22,344 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 23:03:22,345 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 23:03:22,345 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 23:03:22,345 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 23:03:22,345 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 23:03:22,346 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 23:03:22,346 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 23:03:22,346 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 23:03:22,346 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 23:03:22,347 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 23:03:22,347 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 23:03:22,347 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 23:03:22,347 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 23:03:22,347 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 23:03:22,348 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 23:03:22,349 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 23:03:22,349 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 23:03:22,349 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 23:03:22,349 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 23:03:22,350 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 23:03:22,350 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 23:03:22,350 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 23:03:22,350 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 23:03:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 23:03:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 23:03:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 23:03:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 23:03:22,351 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 23:03:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 23:03:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 23:03:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 23:03:22,352 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 23:03:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 23:03:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 23:03:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 23:03:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 23:03:22,353 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 23:03:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 23:03:22,354 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 23:03:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 23:03:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 23:03:22,355 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 23:03:22,356 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 23:03:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 23:03:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 23:03:22,357 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 23:03:22,358 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 23:03:22,358 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 23:03:22,358 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 23:03:22,358 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 23:03:22,358 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 23:03:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 23:03:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 23:03:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 23:03:22,359 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 23:03:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 23:03:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 23:03:22,360 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 23:03:22,361 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 23:03:22,361 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 23:03:22,362 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 23:03:22,365 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 23:03:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 23:03:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure memcpy [2021-11-02 23:03:22,366 INFO L130 BoogieDeclarations]: Found specification of procedure memmove [2021-11-02 23:03:22,367 INFO L130 BoogieDeclarations]: Found specification of procedure memccpy [2021-11-02 23:03:22,369 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2021-11-02 23:03:22,369 INFO L130 BoogieDeclarations]: Found specification of procedure memcmp [2021-11-02 23:03:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure memchr [2021-11-02 23:03:22,370 INFO L130 BoogieDeclarations]: Found specification of procedure strcpy [2021-11-02 23:03:22,376 INFO L130 BoogieDeclarations]: Found specification of procedure strncpy [2021-11-02 23:03:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure strcat [2021-11-02 23:03:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure strncat [2021-11-02 23:03:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure strcmp [2021-11-02 23:03:22,377 INFO L130 BoogieDeclarations]: Found specification of procedure strncmp [2021-11-02 23:03:22,378 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll [2021-11-02 23:03:22,378 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm [2021-11-02 23:03:22,378 INFO L130 BoogieDeclarations]: Found specification of procedure strcoll_l [2021-11-02 23:03:22,378 INFO L130 BoogieDeclarations]: Found specification of procedure strxfrm_l [2021-11-02 23:03:22,378 INFO L130 BoogieDeclarations]: Found specification of procedure strdup [2021-11-02 23:03:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure strndup [2021-11-02 23:03:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure strchr [2021-11-02 23:03:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure strrchr [2021-11-02 23:03:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure strcspn [2021-11-02 23:03:22,379 INFO L130 BoogieDeclarations]: Found specification of procedure strspn [2021-11-02 23:03:22,380 INFO L130 BoogieDeclarations]: Found specification of procedure strpbrk [2021-11-02 23:03:22,380 INFO L130 BoogieDeclarations]: Found specification of procedure strstr [2021-11-02 23:03:22,380 INFO L130 BoogieDeclarations]: Found specification of procedure strtok [2021-11-02 23:03:22,380 INFO L130 BoogieDeclarations]: Found specification of procedure __strtok_r [2021-11-02 23:03:22,380 INFO L130 BoogieDeclarations]: Found specification of procedure strtok_r [2021-11-02 23:03:22,381 INFO L130 BoogieDeclarations]: Found specification of procedure strlen [2021-11-02 23:03:22,381 INFO L130 BoogieDeclarations]: Found specification of procedure strnlen [2021-11-02 23:03:22,381 INFO L130 BoogieDeclarations]: Found specification of procedure strerror [2021-11-02 23:03:22,381 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_r [2021-11-02 23:03:22,381 INFO L130 BoogieDeclarations]: Found specification of procedure strerror_l [2021-11-02 23:03:22,382 INFO L130 BoogieDeclarations]: Found specification of procedure bcmp [2021-11-02 23:03:22,382 INFO L130 BoogieDeclarations]: Found specification of procedure bcopy [2021-11-02 23:03:22,382 INFO L130 BoogieDeclarations]: Found specification of procedure bzero [2021-11-02 23:03:22,382 INFO L130 BoogieDeclarations]: Found specification of procedure index [2021-11-02 23:03:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure rindex [2021-11-02 23:03:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure ffs [2021-11-02 23:03:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure ffsl [2021-11-02 23:03:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure ffsll [2021-11-02 23:03:22,383 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp [2021-11-02 23:03:22,384 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp [2021-11-02 23:03:22,384 INFO L130 BoogieDeclarations]: Found specification of procedure strcasecmp_l [2021-11-02 23:03:22,384 INFO L130 BoogieDeclarations]: Found specification of procedure strncasecmp_l [2021-11-02 23:03:22,384 INFO L130 BoogieDeclarations]: Found specification of procedure explicit_bzero [2021-11-02 23:03:22,384 INFO L130 BoogieDeclarations]: Found specification of procedure strsep [2021-11-02 23:03:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure strsignal [2021-11-02 23:03:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure __stpcpy [2021-11-02 23:03:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure stpcpy [2021-11-02 23:03:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure __stpncpy [2021-11-02 23:03:22,385 INFO L130 BoogieDeclarations]: Found specification of procedure stpncpy [2021-11-02 23:03:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 23:03:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure is_empty [2021-11-02 23:03:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-02 23:03:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 23:03:22,386 INFO L130 BoogieDeclarations]: Found specification of procedure create_item [2021-11-02 23:03:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-02 23:03:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-02 23:03:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-02 23:03:22,387 INFO L130 BoogieDeclarations]: Found specification of procedure append_one [2021-11-02 23:03:22,388 INFO L130 BoogieDeclarations]: Found specification of procedure remove_one [2021-11-02 23:03:22,388 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2021-11-02 23:03:22,388 INFO L130 BoogieDeclarations]: Found specification of procedure rand_end_point [2021-11-02 23:03:22,388 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 23:03:22,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 23:03:22,389 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-02 23:03:22,389 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-02 23:03:22,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 23:03:22,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.setCurrentRoundingMode [2021-11-02 23:03:22,389 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-02 23:03:23,503 WARN L805 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-02 23:03:23,672 INFO L758 $ProcedureCfgBuilder]: dead code at ProgramPoint abortFINAL: assume true; [2021-11-02 23:03:23,845 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 23:03:23,846 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-02 23:03:23,849 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:03:23 BoogieIcfgContainer [2021-11-02 23:03:23,849 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 23:03:23,852 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 23:03:23,852 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 23:03:23,856 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 23:03:23,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 11:03:21" (1/3) ... [2021-11-02 23:03:23,858 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@751d8a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:03:23, skipping insertion in model container [2021-11-02 23:03:23,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:03:22" (2/3) ... [2021-11-02 23:03:23,859 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@751d8a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:03:23, skipping insertion in model container [2021-11-02 23:03:23,859 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:03:23" (3/3) ... [2021-11-02 23:03:23,860 INFO L111 eAbstractionObserver]: Analyzing ICFG test-0214_1.i [2021-11-02 23:03:23,869 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 23:03:23,869 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 57 error locations. [2021-11-02 23:03:23,927 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 23:03:23,933 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 23:03:23,934 INFO L340 AbstractCegarLoop]: Starting to check reachability of 57 error locations. [2021-11-02 23:03:23,969 INFO L276 IsEmpty]: Start isEmpty. Operand has 166 states, 91 states have (on average 1.8681318681318682) internal successors, (170), 148 states have internal predecessors, (170), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-02 23:03:23,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-02 23:03:23,991 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:23,992 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:23,992 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:23,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:23,999 INFO L85 PathProgramCache]: Analyzing trace with hash 603498837, now seen corresponding path program 1 times [2021-11-02 23:03:24,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:24,014 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [401333052] [2021-11-02 23:03:24,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:24,016 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:24,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:24,025 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:24,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-02 23:03:24,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:24,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 23:03:24,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:24,524 INFO L354 Elim1Store]: treesize reduction 77, result has 29.4 percent of original size [2021-11-02 23:03:24,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 37 [2021-11-02 23:03:24,937 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 23:03:24,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:25,046 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 23:03:25,047 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:25,048 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [401333052] [2021-11-02 23:03:25,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [401333052] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:25,049 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:25,049 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-02 23:03:25,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066936853] [2021-11-02 23:03:25,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 23:03:25,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:25,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 23:03:25,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 23:03:25,083 INFO L87 Difference]: Start difference. First operand has 166 states, 91 states have (on average 1.8681318681318682) internal successors, (170), 148 states have internal predecessors, (170), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 23:03:25,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:25,781 INFO L93 Difference]: Finished difference Result 315 states and 352 transitions. [2021-11-02 23:03:25,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 23:03:25,785 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 10 [2021-11-02 23:03:25,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:25,814 INFO L225 Difference]: With dead ends: 315 [2021-11-02 23:03:25,814 INFO L226 Difference]: Without dead ends: 305 [2021-11-02 23:03:25,816 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 1 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 23:03:25,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-11-02 23:03:25,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 220. [2021-11-02 23:03:25,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 137 states have (on average 1.7956204379562044) internal successors, (246), 192 states have internal predecessors, (246), 15 states have call successors, (15), 13 states have call predecessors, (15), 12 states have return successors, (16), 14 states have call predecessors, (16), 14 states have call successors, (16) [2021-11-02 23:03:25,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 277 transitions. [2021-11-02 23:03:25,904 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 277 transitions. Word has length 10 [2021-11-02 23:03:25,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:25,905 INFO L470 AbstractCegarLoop]: Abstraction has 220 states and 277 transitions. [2021-11-02 23:03:25,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 23:03:25,905 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 277 transitions. [2021-11-02 23:03:25,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-02 23:03:25,906 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:25,906 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:25,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:26,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:26,124 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:26,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:26,126 INFO L85 PathProgramCache]: Analyzing trace with hash 603498838, now seen corresponding path program 1 times [2021-11-02 23:03:26,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:26,127 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2017010151] [2021-11-02 23:03:26,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:26,128 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:26,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:26,136 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:26,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-02 23:03:26,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:26,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-02 23:03:26,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:26,447 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-02 23:03:26,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 27 [2021-11-02 23:03:26,612 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 23:03:26,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:27,004 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 23:03:27,005 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:27,005 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2017010151] [2021-11-02 23:03:27,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2017010151] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:27,006 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:27,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-02 23:03:27,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576868926] [2021-11-02 23:03:27,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:03:27,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:27,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:03:27,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:03:27,010 INFO L87 Difference]: Start difference. First operand 220 states and 277 transitions. Second operand has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 23:03:29,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:29,278 INFO L93 Difference]: Finished difference Result 600 states and 746 transitions. [2021-11-02 23:03:29,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 23:03:29,282 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 10 [2021-11-02 23:03:29,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:29,287 INFO L225 Difference]: With dead ends: 600 [2021-11-02 23:03:29,288 INFO L226 Difference]: Without dead ends: 600 [2021-11-02 23:03:29,289 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:03:29,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2021-11-02 23:03:29,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 454. [2021-11-02 23:03:29,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 333 states have (on average 1.7807807807807807) internal successors, (593), 388 states have internal predecessors, (593), 37 states have call successors, (37), 31 states have call predecessors, (37), 30 states have return successors, (42), 34 states have call predecessors, (42), 36 states have call successors, (42) [2021-11-02 23:03:29,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 672 transitions. [2021-11-02 23:03:29,354 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 672 transitions. Word has length 10 [2021-11-02 23:03:29,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:29,355 INFO L470 AbstractCegarLoop]: Abstraction has 454 states and 672 transitions. [2021-11-02 23:03:29,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 23:03:29,356 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 672 transitions. [2021-11-02 23:03:29,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-02 23:03:29,357 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:29,357 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:29,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:29,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:29,563 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr2REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:29,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:29,564 INFO L85 PathProgramCache]: Analyzing trace with hash 100951893, now seen corresponding path program 1 times [2021-11-02 23:03:29,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:29,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1820730587] [2021-11-02 23:03:29,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:29,566 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:29,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:29,568 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:29,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-02 23:03:29,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:29,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-02 23:03:29,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:29,841 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 23:03:29,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:29,905 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 23:03:29,905 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:29,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1820730587] [2021-11-02 23:03:29,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1820730587] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:29,906 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:29,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-02 23:03:29,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619207252] [2021-11-02 23:03:29,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 23:03:29,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:29,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 23:03:29,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:03:29,909 INFO L87 Difference]: Start difference. First operand 454 states and 672 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (2), 1 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 23:03:29,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:29,968 INFO L93 Difference]: Finished difference Result 518 states and 767 transitions. [2021-11-02 23:03:29,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 23:03:29,969 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (2), 1 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 13 [2021-11-02 23:03:29,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:29,976 INFO L225 Difference]: With dead ends: 518 [2021-11-02 23:03:29,976 INFO L226 Difference]: Without dead ends: 518 [2021-11-02 23:03:29,977 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-02 23:03:29,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-11-02 23:03:30,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 500. [2021-11-02 23:03:30,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 371 states have (on average 1.7493261455525606) internal successors, (649), 426 states have internal predecessors, (649), 45 states have call successors, (45), 31 states have call predecessors, (45), 30 states have return successors, (52), 42 states have call predecessors, (52), 44 states have call successors, (52) [2021-11-02 23:03:30,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 746 transitions. [2021-11-02 23:03:30,020 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 746 transitions. Word has length 13 [2021-11-02 23:03:30,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:30,021 INFO L470 AbstractCegarLoop]: Abstraction has 500 states and 746 transitions. [2021-11-02 23:03:30,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (2), 1 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 23:03:30,021 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 746 transitions. [2021-11-02 23:03:30,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 23:03:30,022 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:30,023 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:30,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:30,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:30,239 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting append_oneErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:30,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:30,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1589899311, now seen corresponding path program 1 times [2021-11-02 23:03:30,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:30,241 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [230665429] [2021-11-02 23:03:30,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:30,241 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:30,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:30,243 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:30,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-02 23:03:30,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:30,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 23:03:30,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:30,559 INFO L354 Elim1Store]: treesize reduction 77, result has 29.4 percent of original size [2021-11-02 23:03:30,559 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 37 [2021-11-02 23:03:30,818 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 23:03:30,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:30,924 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 23:03:30,924 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:30,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [230665429] [2021-11-02 23:03:30,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [230665429] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:30,925 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:30,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-02 23:03:30,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674527747] [2021-11-02 23:03:30,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 23:03:30,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:30,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 23:03:30,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 23:03:30,928 INFO L87 Difference]: Start difference. First operand 500 states and 746 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:03:31,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:31,805 INFO L93 Difference]: Finished difference Result 622 states and 889 transitions. [2021-11-02 23:03:31,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 23:03:31,809 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 15 [2021-11-02 23:03:31,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:31,815 INFO L225 Difference]: With dead ends: 622 [2021-11-02 23:03:31,816 INFO L226 Difference]: Without dead ends: 622 [2021-11-02 23:03:31,816 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 5 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-02 23:03:31,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-11-02 23:03:31,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 496. [2021-11-02 23:03:31,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 371 states have (on average 1.7008086253369272) internal successors, (631), 422 states have internal predecessors, (631), 45 states have call successors, (45), 31 states have call predecessors, (45), 30 states have return successors, (52), 42 states have call predecessors, (52), 44 states have call successors, (52) [2021-11-02 23:03:31,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 728 transitions. [2021-11-02 23:03:31,869 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 728 transitions. Word has length 15 [2021-11-02 23:03:31,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:31,870 INFO L470 AbstractCegarLoop]: Abstraction has 496 states and 728 transitions. [2021-11-02 23:03:31,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:03:31,870 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 728 transitions. [2021-11-02 23:03:31,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 23:03:31,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:31,872 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:31,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:32,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:32,089 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting append_oneErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:32,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:32,090 INFO L85 PathProgramCache]: Analyzing trace with hash -1589899310, now seen corresponding path program 1 times [2021-11-02 23:03:32,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:32,091 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1849377000] [2021-11-02 23:03:32,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:32,092 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:32,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:32,094 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:32,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-02 23:03:32,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:32,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-02 23:03:32,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:32,414 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-02 23:03:32,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 27 [2021-11-02 23:03:32,675 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 23:03:32,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:33,870 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 23:03:33,870 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:33,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1849377000] [2021-11-02 23:03:33,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1849377000] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:33,871 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:33,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 11 [2021-11-02 23:03:33,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301447406] [2021-11-02 23:03:33,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 23:03:33,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:33,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 23:03:33,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-02 23:03:33,873 INFO L87 Difference]: Start difference. First operand 496 states and 728 transitions. Second operand has 12 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 23:03:38,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:38,988 INFO L93 Difference]: Finished difference Result 611 states and 775 transitions. [2021-11-02 23:03:38,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 23:03:38,990 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 15 [2021-11-02 23:03:38,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:38,996 INFO L225 Difference]: With dead ends: 611 [2021-11-02 23:03:38,996 INFO L226 Difference]: Without dead ends: 611 [2021-11-02 23:03:38,997 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2021-11-02 23:03:38,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-11-02 23:03:39,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 502. [2021-11-02 23:03:39,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 375 states have (on average 1.6906666666666668) internal successors, (634), 424 states have internal predecessors, (634), 47 states have call successors, (47), 33 states have call predecessors, (47), 30 states have return successors, (54), 44 states have call predecessors, (54), 46 states have call successors, (54) [2021-11-02 23:03:39,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 735 transitions. [2021-11-02 23:03:39,036 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 735 transitions. Word has length 15 [2021-11-02 23:03:39,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:39,036 INFO L470 AbstractCegarLoop]: Abstraction has 502 states and 735 transitions. [2021-11-02 23:03:39,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 5 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 23:03:39,037 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 735 transitions. [2021-11-02 23:03:39,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 23:03:39,038 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:39,039 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:39,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:39,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:39,254 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr7ENSURES_VIOLATIONMEMORY_LEAK === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:39,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:39,254 INFO L85 PathProgramCache]: Analyzing trace with hash -1165459907, now seen corresponding path program 1 times [2021-11-02 23:03:39,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:39,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1541095509] [2021-11-02 23:03:39,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:39,256 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:39,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:39,257 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:39,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-02 23:03:39,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:39,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-02 23:03:39,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:39,573 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 23:03:39,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:39,636 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 23:03:39,636 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:39,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1541095509] [2021-11-02 23:03:39,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1541095509] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:39,638 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:39,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-02 23:03:39,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600466316] [2021-11-02 23:03:39,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 23:03:39,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:39,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 23:03:39,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 23:03:39,640 INFO L87 Difference]: Start difference. First operand 502 states and 735 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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 23:03:39,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:39,984 INFO L93 Difference]: Finished difference Result 605 states and 891 transitions. [2021-11-02 23:03:39,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 23:03:39,985 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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 14 [2021-11-02 23:03:39,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:39,991 INFO L225 Difference]: With dead ends: 605 [2021-11-02 23:03:39,991 INFO L226 Difference]: Without dead ends: 598 [2021-11-02 23:03:39,992 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 23:03:39,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2021-11-02 23:03:40,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 518. [2021-11-02 23:03:40,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 518 states, 385 states have (on average 1.6753246753246753) internal successors, (645), 437 states have internal predecessors, (645), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:40,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 518 states to 518 states and 754 transitions. [2021-11-02 23:03:40,018 INFO L78 Accepts]: Start accepts. Automaton has 518 states and 754 transitions. Word has length 14 [2021-11-02 23:03:40,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:40,019 INFO L470 AbstractCegarLoop]: Abstraction has 518 states and 754 transitions. [2021-11-02 23:03:40,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 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 23:03:40,019 INFO L276 IsEmpty]: Start isEmpty. Operand 518 states and 754 transitions. [2021-11-02 23:03:40,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 23:03:40,020 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:40,020 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:40,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:40,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:40,236 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting is_emptyErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:40,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:40,237 INFO L85 PathProgramCache]: Analyzing trace with hash -812361102, now seen corresponding path program 1 times [2021-11-02 23:03:40,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:40,237 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1980652266] [2021-11-02 23:03:40,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:40,238 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:40,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:40,240 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:40,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-02 23:03:40,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:40,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-02 23:03:40,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:40,568 INFO L354 Elim1Store]: treesize reduction 77, result has 29.4 percent of original size [2021-11-02 23:03:40,569 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 37 [2021-11-02 23:03:40,855 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 23:03:40,855 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:40,960 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 23:03:40,960 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:40,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1980652266] [2021-11-02 23:03:40,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1980652266] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:40,961 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:40,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 6 [2021-11-02 23:03:40,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7165707] [2021-11-02 23:03:40,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 23:03:40,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:40,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 23:03:40,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:03:40,963 INFO L87 Difference]: Start difference. First operand 518 states and 754 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:03:42,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:42,033 INFO L93 Difference]: Finished difference Result 630 states and 873 transitions. [2021-11-02 23:03:42,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 23:03:42,035 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 18 [2021-11-02 23:03:42,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:42,041 INFO L225 Difference]: With dead ends: 630 [2021-11-02 23:03:42,041 INFO L226 Difference]: Without dead ends: 630 [2021-11-02 23:03:42,042 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-02 23:03:42,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-11-02 23:03:42,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 515. [2021-11-02 23:03:42,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 515 states, 388 states have (on average 1.615979381443299) internal successors, (627), 434 states have internal predecessors, (627), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:42,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 515 states to 515 states and 736 transitions. [2021-11-02 23:03:42,070 INFO L78 Accepts]: Start accepts. Automaton has 515 states and 736 transitions. Word has length 18 [2021-11-02 23:03:42,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:42,071 INFO L470 AbstractCegarLoop]: Abstraction has 515 states and 736 transitions. [2021-11-02 23:03:42,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 23:03:42,072 INFO L276 IsEmpty]: Start isEmpty. Operand 515 states and 736 transitions. [2021-11-02 23:03:42,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 23:03:42,073 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:42,073 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 23:03:42,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:42,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:42,288 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting is_emptyErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:42,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:42,289 INFO L85 PathProgramCache]: Analyzing trace with hash -812361101, now seen corresponding path program 1 times [2021-11-02 23:03:42,289 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:42,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [574441693] [2021-11-02 23:03:42,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:42,290 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:42,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:42,295 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:42,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-02 23:03:42,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:42,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 23:03:42,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:42,626 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-02 23:03:42,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 12 treesize of output 27 [2021-11-02 23:03:42,891 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 23:03:42,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:43,478 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 23:03:43,478 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:43,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [574441693] [2021-11-02 23:03:43,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [574441693] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:43,482 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:43,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 11 [2021-11-02 23:03:43,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904611500] [2021-11-02 23:03:43,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 23:03:43,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:43,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 23:03:43,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-02 23:03:43,485 INFO L87 Difference]: Start difference. First operand 515 states and 736 transitions. Second operand has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (9), 7 states have call predecessors, (9), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 23:03:47,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:47,566 INFO L93 Difference]: Finished difference Result 602 states and 764 transitions. [2021-11-02 23:03:47,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 23:03:47,567 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (9), 7 states have call predecessors, (9), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 18 [2021-11-02 23:03:47,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:47,572 INFO L225 Difference]: With dead ends: 602 [2021-11-02 23:03:47,572 INFO L226 Difference]: Without dead ends: 602 [2021-11-02 23:03:47,572 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2021-11-02 23:03:47,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2021-11-02 23:03:47,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 514. [2021-11-02 23:03:47,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 388 states have (on average 1.574742268041237) internal successors, (611), 433 states have internal predecessors, (611), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:47,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 720 transitions. [2021-11-02 23:03:47,607 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 720 transitions. Word has length 18 [2021-11-02 23:03:47,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:47,607 INFO L470 AbstractCegarLoop]: Abstraction has 514 states and 720 transitions. [2021-11-02 23:03:47,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (9), 7 states have call predecessors, (9), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-02 23:03:47,608 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 720 transitions. [2021-11-02 23:03:47,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 23:03:47,613 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:47,614 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] [2021-11-02 23:03:47,638 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-02 23:03:47,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:47,830 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting create_itemErr0REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:47,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:47,830 INFO L85 PathProgramCache]: Analyzing trace with hash 127601264, now seen corresponding path program 1 times [2021-11-02 23:03:47,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:47,831 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1856826244] [2021-11-02 23:03:47,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:47,832 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:47,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:47,834 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:47,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-02 23:03:48,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:48,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-02 23:03:48,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:48,217 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 23:03:48,238 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 23:03:48,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:48,312 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 23:03:48,312 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:48,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1856826244] [2021-11-02 23:03:48,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1856826244] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:48,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:48,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-02 23:03:48,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902598533] [2021-11-02 23:03:48,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-02 23:03:48,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:48,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-02 23:03:48,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-02 23:03:48,315 INFO L87 Difference]: Start difference. First operand 514 states and 720 transitions. Second operand has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (5), 1 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 23:03:48,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:48,598 INFO L93 Difference]: Finished difference Result 511 states and 708 transitions. [2021-11-02 23:03:48,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-02 23:03:48,599 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (5), 1 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 22 [2021-11-02 23:03:48,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:48,603 INFO L225 Difference]: With dead ends: 511 [2021-11-02 23:03:48,603 INFO L226 Difference]: Without dead ends: 511 [2021-11-02 23:03:48,603 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 42 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 23:03:48,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-02 23:03:48,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 511. [2021-11-02 23:03:48,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 388 states have (on average 1.5438144329896908) internal successors, (599), 430 states have internal predecessors, (599), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:48,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 708 transitions. [2021-11-02 23:03:48,625 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 708 transitions. Word has length 22 [2021-11-02 23:03:48,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:48,625 INFO L470 AbstractCegarLoop]: Abstraction has 511 states and 708 transitions. [2021-11-02 23:03:48,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 7.5) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (5), 1 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 23:03:48,626 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 708 transitions. [2021-11-02 23:03:48,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 23:03:48,627 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:48,627 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] [2021-11-02 23:03:48,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:48,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:48,843 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:48,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:48,843 INFO L85 PathProgramCache]: Analyzing trace with hash 127601265, now seen corresponding path program 1 times [2021-11-02 23:03:48,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:48,844 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1231640356] [2021-11-02 23:03:48,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:48,844 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:48,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:48,845 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:48,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-02 23:03:49,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:49,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 23:03:49,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:49,199 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 23:03:49,281 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 23:03:49,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:49,580 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 23:03:49,580 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:49,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1231640356] [2021-11-02 23:03:49,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1231640356] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:49,580 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:49,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-02 23:03:49,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726548097] [2021-11-02 23:03:49,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:03:49,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:49,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:03:49,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:03:49,583 INFO L87 Difference]: Start difference. First operand 511 states and 708 transitions. Second operand has 6 states, 5 states have (on average 4.2) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (5), 1 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 23:03:50,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:50,537 INFO L93 Difference]: Finished difference Result 561 states and 768 transitions. [2021-11-02 23:03:50,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 23:03:50,539 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (5), 1 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 22 [2021-11-02 23:03:50,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:50,543 INFO L225 Difference]: With dead ends: 561 [2021-11-02 23:03:50,543 INFO L226 Difference]: Without dead ends: 561 [2021-11-02 23:03:50,544 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:03:50,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-11-02 23:03:50,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 518. [2021-11-02 23:03:50,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 518 states, 396 states have (on average 1.5227272727272727) internal successors, (603), 437 states have internal predecessors, (603), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:50,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 518 states to 518 states and 712 transitions. [2021-11-02 23:03:50,591 INFO L78 Accepts]: Start accepts. Automaton has 518 states and 712 transitions. Word has length 22 [2021-11-02 23:03:50,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:50,592 INFO L470 AbstractCegarLoop]: Abstraction has 518 states and 712 transitions. [2021-11-02 23:03:50,592 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (5), 1 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 23:03:50,592 INFO L276 IsEmpty]: Start isEmpty. Operand 518 states and 712 transitions. [2021-11-02 23:03:50,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 23:03:50,595 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:50,595 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] [2021-11-02 23:03:50,611 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:50,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:50,811 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting create_itemErr3REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:50,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:50,812 INFO L85 PathProgramCache]: Analyzing trace with hash -339327853, now seen corresponding path program 1 times [2021-11-02 23:03:50,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:50,813 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1239129495] [2021-11-02 23:03:50,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:50,813 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:50,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:50,814 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:50,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-02 23:03:51,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:51,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 23:03:51,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:51,191 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 23:03:51,287 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 23:03:51,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:51,616 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 23:03:51,616 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:51,616 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1239129495] [2021-11-02 23:03:51,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1239129495] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:51,616 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:51,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-11-02 23:03:51,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717508473] [2021-11-02 23:03:51,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 23:03:51,617 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:51,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 23:03:51,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-02 23:03:51,619 INFO L87 Difference]: Start difference. First operand 518 states and 712 transitions. Second operand has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (5), 1 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 23:03:52,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:52,505 INFO L93 Difference]: Finished difference Result 564 states and 768 transitions. [2021-11-02 23:03:52,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 23:03:52,506 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (5), 1 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 23 [2021-11-02 23:03:52,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:52,511 INFO L225 Difference]: With dead ends: 564 [2021-11-02 23:03:52,511 INFO L226 Difference]: Without dead ends: 564 [2021-11-02 23:03:52,511 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-02 23:03:52,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2021-11-02 23:03:52,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 522. [2021-11-02 23:03:52,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 400 states have (on average 1.5175) internal successors, (607), 441 states have internal predecessors, (607), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:52,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 716 transitions. [2021-11-02 23:03:52,533 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 716 transitions. Word has length 23 [2021-11-02 23:03:52,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:52,534 INFO L470 AbstractCegarLoop]: Abstraction has 522 states and 716 transitions. [2021-11-02 23:03:52,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 1 states have call successors, (5), 1 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 23:03:52,534 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 716 transitions. [2021-11-02 23:03:52,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-02 23:03:52,535 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:52,535 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] [2021-11-02 23:03:52,567 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (12)] Ended with exit code 0 [2021-11-02 23:03:52,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:52,769 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting create_itemErr1REQUIRES_VIOLATION === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:52,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:52,769 INFO L85 PathProgramCache]: Analyzing trace with hash -339270227, now seen corresponding path program 1 times [2021-11-02 23:03:52,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:52,770 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [801584842] [2021-11-02 23:03:52,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:52,771 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:52,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:52,772 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:52,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-02 23:03:53,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:53,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-02 23:03:53,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:53,310 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 23:03:53,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:53,406 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 23:03:53,406 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:53,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [801584842] [2021-11-02 23:03:53,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [801584842] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:53,407 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:53,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [] total 9 [2021-11-02 23:03:53,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204690870] [2021-11-02 23:03:53,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 23:03:53,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:53,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 23:03:53,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 23:03:53,409 INFO L87 Difference]: Start difference. First operand 522 states and 716 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 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 23:03:53,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 23:03:53,583 INFO L93 Difference]: Finished difference Result 504 states and 684 transitions. [2021-11-02 23:03:53,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 23:03:53,585 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 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 23 [2021-11-02 23:03:53,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 23:03:53,589 INFO L225 Difference]: With dead ends: 504 [2021-11-02 23:03:53,589 INFO L226 Difference]: Without dead ends: 504 [2021-11-02 23:03:53,589 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 38 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 23:03:53,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-02 23:03:53,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-02 23:03:53,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 384 states have (on average 1.4973958333333333) internal successors, (575), 423 states have internal predecessors, (575), 47 states have call successors, (47), 33 states have call predecessors, (47), 36 states have return successors, (62), 47 states have call predecessors, (62), 46 states have call successors, (62) [2021-11-02 23:03:53,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 684 transitions. [2021-11-02 23:03:53,611 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 684 transitions. Word has length 23 [2021-11-02 23:03:53,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 23:03:53,612 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 684 transitions. [2021-11-02 23:03:53,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 6 states have internal predecessors, (16), 3 states have call successors, (5), 3 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 23:03:53,612 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 684 transitions. [2021-11-02 23:03:53,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 23:03:53,613 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 23:03:53,613 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] [2021-11-02 23:03:53,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-02 23:03:53,829 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 [2021-11-02 23:03:53,829 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting is_emptyErr5ASSERT_VIOLATIONMEMORY_FREE === [append_oneErr0REQUIRES_VIOLATION, append_oneErr1REQUIRES_VIOLATION, append_oneErr2REQUIRES_VIOLATION, append_oneErr3REQUIRES_VIOLATION (and 53 more)] === [2021-11-02 23:03:53,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 23:03:53,830 INFO L85 PathProgramCache]: Analyzing trace with hash 360508246, now seen corresponding path program 1 times [2021-11-02 23:03:53,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2021-11-02 23:03:53,830 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1832132376] [2021-11-02 23:03:53,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 23:03:53,831 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-02 23:03:53,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat [2021-11-02 23:03:53,832 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-02 23:03:53,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_86058c40-ff63-423f-80bd-ae6764078984/bin/uautomizer-tBqnrhUYjU/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-02 23:03:54,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 23:03:54,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-02 23:03:54,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 23:03:55,180 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:03:55,185 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:03:55,185 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 47 treesize of output 36 [2021-11-02 23:03:55,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:03:55,192 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:03:55,195 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 23:03:55,195 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 27 treesize of output 16 [2021-11-02 23:03:55,284 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 23:03:55,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-02 23:03:57,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:03:57,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:03:57,406 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:03:57,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:03:57,411 INFO L354 Elim1Store]: treesize reduction 8, result has 11.1 percent of original size [2021-11-02 23:03:57,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 114 treesize of output 1 [2021-11-02 23:03:57,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:03:57,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:03:57,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 23:03:57,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 23:03:57,609 INFO L354 Elim1Store]: treesize reduction 8, result has 11.1 percent of original size [2021-11-02 23:03:57,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 114 treesize of output 1 [2021-11-02 23:03:57,613 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 23:03:57,613 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2021-11-02 23:03:57,613 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1832132376] [2021-11-02 23:03:57,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1832132376] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-02 23:03:57,614 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-02 23:03:57,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11, 11] imperfect sequences [] total 20 [2021-11-02 23:03:57,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937210453] [2021-11-02 23:03:57,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 23:03:57,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2021-11-02 23:03:57,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 23:03:57,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2021-11-02 23:03:57,616 INFO L87 Difference]: Start difference. First operand 504 states and 684 transitions. Second operand has 20 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 16 states have internal predecessors, (32), 5 states have call successors, (9), 7 states have call predecessors, (9), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4)