./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y --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 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-13 17:30:59,772 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-13 17:30:59,774 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-13 17:30:59,821 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-13 17:30:59,822 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-13 17:30:59,827 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-13 17:30:59,829 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-13 17:30:59,833 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-13 17:30:59,836 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-13 17:30:59,843 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-13 17:30:59,844 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-13 17:30:59,846 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-13 17:30:59,847 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-13 17:30:59,849 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-13 17:30:59,851 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-13 17:30:59,856 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-13 17:30:59,858 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-13 17:30:59,859 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-13 17:30:59,862 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-13 17:30:59,870 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-13 17:30:59,872 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-13 17:30:59,873 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-13 17:30:59,877 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-13 17:30:59,878 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-13 17:30:59,882 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-13 17:30:59,882 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-13 17:30:59,882 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-13 17:30:59,884 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-13 17:30:59,885 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-13 17:30:59,886 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-13 17:30:59,887 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-13 17:30:59,888 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-13 17:30:59,890 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-13 17:30:59,892 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-13 17:30:59,893 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-13 17:30:59,893 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-13 17:30:59,894 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-13 17:30:59,894 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-13 17:30:59,895 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-13 17:30:59,896 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-13 17:30:59,896 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-13 17:30:59,897 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-13 17:30:59,946 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-13 17:30:59,948 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-13 17:30:59,948 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-13 17:30:59,949 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-13 17:30:59,956 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-13 17:30:59,956 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-13 17:30:59,957 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-13 17:30:59,957 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-13 17:30:59,958 INFO L138 SettingsManager]: * Use SBE=true [2021-11-13 17:30:59,958 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-13 17:30:59,959 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-13 17:30:59,959 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-13 17:30:59,960 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-13 17:30:59,960 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-13 17:30:59,960 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-13 17:30:59,960 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-13 17:30:59,961 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-13 17:30:59,961 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-13 17:30:59,961 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-13 17:30:59,961 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-13 17:30:59,961 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-13 17:30:59,962 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-13 17:30:59,962 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-13 17:30:59,962 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-13 17:30:59,962 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-13 17:30:59,963 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 17:30:59,963 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-13 17:30:59,963 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-13 17:30:59,963 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-13 17:30:59,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-13 17:30:59,965 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-13 17:30:59,966 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_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4cb6276eff0c60579b1d5f7034948eb4f53891709ff48cdd11b3329ec3c4cc2e [2021-11-13 17:31:00,274 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-13 17:31:00,313 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-13 17:31:00,316 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-13 17:31:00,318 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-13 17:31:00,318 INFO L275 PluginConnector]: CDTParser initialized [2021-11-13 17:31:00,320 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/../../sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-13 17:31:00,409 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/data/8f1b39e26/211007d8706d4ea6817496964f15ea7c/FLAGfaf159e2b [2021-11-13 17:31:01,015 INFO L306 CDTParser]: Found 1 translation units. [2021-11-13 17:31:01,019 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/sv-benchmarks/c/array-memsafety/substring-alloca-2.i [2021-11-13 17:31:01,039 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/data/8f1b39e26/211007d8706d4ea6817496964f15ea7c/FLAGfaf159e2b [2021-11-13 17:31:01,293 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/data/8f1b39e26/211007d8706d4ea6817496964f15ea7c [2021-11-13 17:31:01,295 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-13 17:31:01,297 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-13 17:31:01,299 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-13 17:31:01,299 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-13 17:31:01,303 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-13 17:31:01,304 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,305 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36ddffe9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01, skipping insertion in model container [2021-11-13 17:31:01,306 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,313 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-13 17:31:01,362 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-13 17:31:01,728 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 17:31:01,736 INFO L203 MainTranslator]: Completed pre-run [2021-11-13 17:31:01,779 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-13 17:31:01,816 INFO L208 MainTranslator]: Completed translation [2021-11-13 17:31:01,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01 WrapperNode [2021-11-13 17:31:01,817 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-13 17:31:01,818 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-13 17:31:01,819 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-13 17:31:01,819 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-13 17:31:01,830 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,830 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,844 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,844 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,859 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,864 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,875 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-13 17:31:01,876 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-13 17:31:01,876 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-13 17:31:01,876 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-13 17:31:01,877 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (1/1) ... [2021-11-13 17:31:01,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-13 17:31:01,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:01,913 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-13 17:31:01,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-13 17:31:01,963 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-13 17:31:01,964 INFO L138 BoogieDeclarations]: Found implementation of procedure substring [2021-11-13 17:31:01,965 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-13 17:31:01,965 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-13 17:31:01,966 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-13 17:31:01,967 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-13 17:31:01,968 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-13 17:31:01,969 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-13 17:31:01,970 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-13 17:31:01,971 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-13 17:31:01,972 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-13 17:31:01,973 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-13 17:31:01,974 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-13 17:31:01,975 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-13 17:31:01,976 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-13 17:31:01,977 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure substring [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-13 17:31:01,978 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-13 17:31:01,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-13 17:31:01,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-13 17:31:02,476 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-13 17:31:02,488 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-13 17:31:02,490 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 05:31:02 BoogieIcfgContainer [2021-11-13 17:31:02,497 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-13 17:31:02,499 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-13 17:31:02,499 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-13 17:31:02,503 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-13 17:31:02,503 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.11 05:31:01" (1/3) ... [2021-11-13 17:31:02,504 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@89cb16e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 05:31:02, skipping insertion in model container [2021-11-13 17:31:02,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.11 05:31:01" (2/3) ... [2021-11-13 17:31:02,506 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@89cb16e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.11 05:31:02, skipping insertion in model container [2021-11-13 17:31:02,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.11 05:31:02" (3/3) ... [2021-11-13 17:31:02,509 INFO L111 eAbstractionObserver]: Analyzing ICFG substring-alloca-2.i [2021-11-13 17:31:02,519 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-13 17:31:02,520 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-13 17:31:02,582 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-13 17:31:02,594 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 [2021-11-13 17:31:02,595 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-13 17:31:02,617 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 1.911764705882353) internal successors, (65), 53 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-13 17:31:02,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 17:31:02,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:02,625 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:02,626 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:02,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:02,631 INFO L85 PathProgramCache]: Analyzing trace with hash -391744755, now seen corresponding path program 1 times [2021-11-13 17:31:02,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:02,641 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514318320] [2021-11-13 17:31:02,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:02,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:02,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:02,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:02,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:02,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:02,956 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:02,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514318320] [2021-11-13 17:31:02,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514318320] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:02,957 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:02,957 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 17:31:02,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964951738] [2021-11-13 17:31:02,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:02,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:31:02,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:02,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:31:02,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:02,992 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 1.911764705882353) internal successors, (65), 53 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-13 17:31:03,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:03,201 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-11-13 17:31:03,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 17:31:03,203 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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 11 [2021-11-13 17:31:03,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:03,212 INFO L225 Difference]: With dead ends: 81 [2021-11-13 17:31:03,213 INFO L226 Difference]: Without dead ends: 77 [2021-11-13 17:31:03,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-13 17:31:03,218 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 54 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 117.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.62ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 145.57ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:03,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 115 Invalid, 131 Unknown, 0 Unchecked, 6.62ms Time], IncrementalHoareTripleChecker [5 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 145.57ms Time] [2021-11-13 17:31:03,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-13 17:31:03,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 60. [2021-11-13 17:31:03,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 36 states have (on average 1.75) internal successors, (63), 54 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:03,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-11-13 17:31:03,274 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 11 [2021-11-13 17:31:03,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:03,275 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-11-13 17:31:03,275 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-13 17:31:03,276 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-11-13 17:31:03,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 17:31:03,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:03,276 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:03,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-13 17:31:03,277 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:03,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:03,280 INFO L85 PathProgramCache]: Analyzing trace with hash -389897713, now seen corresponding path program 1 times [2021-11-13 17:31:03,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:03,282 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564810884] [2021-11-13 17:31:03,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:03,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:03,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:03,475 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:03,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:03,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:03,486 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:03,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564810884] [2021-11-13 17:31:03,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564810884] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:03,488 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:03,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 17:31:03,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871752551] [2021-11-13 17:31:03,490 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:03,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:31:03,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:03,492 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:31:03,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:03,493 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-13 17:31:03,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:03,750 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2021-11-13 17:31:03,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 17:31:03,751 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 11 [2021-11-13 17:31:03,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:03,756 INFO L225 Difference]: With dead ends: 82 [2021-11-13 17:31:03,756 INFO L226 Difference]: Without dead ends: 82 [2021-11-13 17:31:03,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:31:03,762 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 57 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 168.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.96ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 204.19ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:03,762 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 73 Invalid, 152 Unknown, 0 Unchecked, 9.96ms Time], IncrementalHoareTripleChecker [3 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 204.19ms Time] [2021-11-13 17:31:03,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-13 17:31:03,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2021-11-13 17:31:03,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.763157894736842) internal successors, (67), 56 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:03,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-11-13 17:31:03,786 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 11 [2021-11-13 17:31:03,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:03,786 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-11-13 17:31:03,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-11-13 17:31:03,786 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-11-13 17:31:03,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-13 17:31:03,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:03,787 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:03,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-13 17:31:03,788 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:03,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:03,788 INFO L85 PathProgramCache]: Analyzing trace with hash -389897714, now seen corresponding path program 1 times [2021-11-13 17:31:03,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:03,789 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196587923] [2021-11-13 17:31:03,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:03,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:03,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:03,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:03,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:03,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:03,895 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:03,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196587923] [2021-11-13 17:31:03,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196587923] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:03,896 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:03,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 17:31:03,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988961512] [2021-11-13 17:31:03,897 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:03,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 17:31:03,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:03,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 17:31:03,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 17:31:03,898 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-11-13 17:31:04,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:04,029 INFO L93 Difference]: Finished difference Result 60 states and 69 transitions. [2021-11-13 17:31:04,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 17:31:04,035 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 11 [2021-11-13 17:31:04,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:04,036 INFO L225 Difference]: With dead ends: 60 [2021-11-13 17:31:04,036 INFO L226 Difference]: Without dead ends: 60 [2021-11-13 17:31:04,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 17:31:04,044 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 51 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 95.44ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.33ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 114.15ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:04,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 46 Invalid, 86 Unknown, 0 Unchecked, 4.33ms Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 114.15ms Time] [2021-11-13 17:31:04,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-13 17:31:04,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-13 17:31:04,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 54 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:04,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 69 transitions. [2021-11-13 17:31:04,059 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 69 transitions. Word has length 11 [2021-11-13 17:31:04,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:04,060 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 69 transitions. [2021-11-13 17:31:04,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-11-13 17:31:04,061 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 69 transitions. [2021-11-13 17:31:04,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 17:31:04,061 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:04,062 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:04,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-13 17:31:04,062 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:04,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:04,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1490361092, now seen corresponding path program 1 times [2021-11-13 17:31:04,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:04,063 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [667809794] [2021-11-13 17:31:04,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:04,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:04,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:04,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:04,196 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:04,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [667809794] [2021-11-13 17:31:04,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [667809794] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:04,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:04,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 17:31:04,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127881048] [2021-11-13 17:31:04,197 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:04,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:31:04,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:04,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:31:04,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:04,199 INFO L87 Difference]: Start difference. First operand 60 states and 69 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-13 17:31:04,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:04,358 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-11-13 17:31:04,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 17:31:04,359 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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 13 [2021-11-13 17:31:04,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:04,362 INFO L225 Difference]: With dead ends: 59 [2021-11-13 17:31:04,362 INFO L226 Difference]: Without dead ends: 59 [2021-11-13 17:31:04,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:31:04,372 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 54 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 103.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.74ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 128.70ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:04,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 51 Invalid, 113 Unknown, 0 Unchecked, 4.74ms Time], IncrementalHoareTripleChecker [4 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 128.70ms Time] [2021-11-13 17:31:04,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-13 17:31:04,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-13 17:31:04,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 53 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:04,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 68 transitions. [2021-11-13 17:31:04,378 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 68 transitions. Word has length 13 [2021-11-13 17:31:04,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:04,378 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 68 transitions. [2021-11-13 17:31:04,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-13 17:31:04,379 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 68 transitions. [2021-11-13 17:31:04,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 17:31:04,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:04,379 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:04,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-13 17:31:04,380 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:04,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:04,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1490361144, now seen corresponding path program 1 times [2021-11-13 17:31:04,380 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:04,381 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701940355] [2021-11-13 17:31:04,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:04,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:04,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,455 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:04,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,466 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:04,466 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:04,466 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701940355] [2021-11-13 17:31:04,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701940355] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:04,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:04,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 17:31:04,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801429869] [2021-11-13 17:31:04,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:04,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:31:04,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:04,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:31:04,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:04,468 INFO L87 Difference]: Start difference. First operand 59 states and 68 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-13 17:31:04,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:04,607 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2021-11-13 17:31:04,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 17:31:04,607 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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 13 [2021-11-13 17:31:04,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:04,609 INFO L225 Difference]: With dead ends: 79 [2021-11-13 17:31:04,609 INFO L226 Difference]: Without dead ends: 79 [2021-11-13 17:31:04,609 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:31:04,610 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 53 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 96.58ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.40ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 113.53ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:04,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 77 Invalid, 83 Unknown, 0 Unchecked, 3.40ms Time], IncrementalHoareTripleChecker [4 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 113.53ms Time] [2021-11-13 17:31:04,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-13 17:31:04,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-13 17:31:04,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 49 states have (on average 1.5714285714285714) internal successors, (77), 64 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:04,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 82 transitions. [2021-11-13 17:31:04,629 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 82 transitions. Word has length 13 [2021-11-13 17:31:04,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:04,629 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 82 transitions. [2021-11-13 17:31:04,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 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) [2021-11-13 17:31:04,629 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 82 transitions. [2021-11-13 17:31:04,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 17:31:04,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:04,630 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:04,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-13 17:31:04,631 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:04,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:04,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1547619446, now seen corresponding path program 1 times [2021-11-13 17:31:04,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:04,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409922773] [2021-11-13 17:31:04,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:04,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:04,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:04,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:04,706 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:04,706 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409922773] [2021-11-13 17:31:04,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409922773] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:04,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:04,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-13 17:31:04,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714808888] [2021-11-13 17:31:04,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:04,707 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 17:31:04,707 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:04,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 17:31:04,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 17:31:04,708 INFO L87 Difference]: Start difference. First operand 70 states and 82 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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) [2021-11-13 17:31:04,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:04,805 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2021-11-13 17:31:04,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 17:31:04,805 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 13 [2021-11-13 17:31:04,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:04,806 INFO L225 Difference]: With dead ends: 68 [2021-11-13 17:31:04,806 INFO L226 Difference]: Without dead ends: 68 [2021-11-13 17:31:04,807 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 17:31:04,808 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 46 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 68.59ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.05ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 84.72ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:04,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 45 Invalid, 81 Unknown, 0 Unchecked, 2.05ms Time], IncrementalHoareTripleChecker [3 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 84.72ms Time] [2021-11-13 17:31:04,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-13 17:31:04,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-13 17:31:04,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 49 states have (on average 1.530612244897959) internal successors, (75), 62 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:04,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2021-11-13 17:31:04,826 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 13 [2021-11-13 17:31:04,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:04,826 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2021-11-13 17:31:04,826 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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) [2021-11-13 17:31:04,826 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2021-11-13 17:31:04,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-13 17:31:04,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:04,827 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:04,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-13 17:31:04,827 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:04,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:04,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1547619447, now seen corresponding path program 1 times [2021-11-13 17:31:04,828 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:04,828 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312191516] [2021-11-13 17:31:04,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:04,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:04,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:04,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:04,944 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:04,944 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:04,944 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312191516] [2021-11-13 17:31:04,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312191516] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:04,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:04,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 17:31:04,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394876642] [2021-11-13 17:31:04,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:04,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 17:31:04,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:04,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 17:31:04,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:31:04,946 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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) [2021-11-13 17:31:05,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:05,093 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2021-11-13 17:31:05,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 17:31:05,094 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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 13 [2021-11-13 17:31:05,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:05,095 INFO L225 Difference]: With dead ends: 79 [2021-11-13 17:31:05,095 INFO L226 Difference]: Without dead ends: 79 [2021-11-13 17:31:05,095 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-13 17:31:05,096 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 70 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 110.37ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.24ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 130.46ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:05,096 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 62 Invalid, 145 Unknown, 0 Unchecked, 2.24ms Time], IncrementalHoareTripleChecker [5 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 130.46ms Time] [2021-11-13 17:31:05,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-13 17:31:05,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 70. [2021-11-13 17:31:05,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 51 states have (on average 1.5294117647058822) internal successors, (78), 64 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:05,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2021-11-13 17:31:05,101 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 13 [2021-11-13 17:31:05,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:05,101 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2021-11-13 17:31:05,101 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 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) [2021-11-13 17:31:05,101 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2021-11-13 17:31:05,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-13 17:31:05,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:05,102 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:05,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-13 17:31:05,102 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:05,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:05,103 INFO L85 PathProgramCache]: Analyzing trace with hash -1043446404, now seen corresponding path program 1 times [2021-11-13 17:31:05,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:05,103 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105248415] [2021-11-13 17:31:05,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:05,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:05,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:05,150 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:05,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:05,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:05,154 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:05,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105248415] [2021-11-13 17:31:05,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105248415] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:05,154 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:05,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 17:31:05,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040442] [2021-11-13 17:31:05,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:05,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:31:05,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:05,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:31:05,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:05,156 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 4 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) [2021-11-13 17:31:05,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:05,252 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-11-13 17:31:05,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-13 17:31:05,253 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), 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 [2021-11-13 17:31:05,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:05,254 INFO L225 Difference]: With dead ends: 69 [2021-11-13 17:31:05,254 INFO L226 Difference]: Without dead ends: 69 [2021-11-13 17:31:05,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:31:05,255 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 63 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 69.90ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.50ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 82.42ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:05,256 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 45 Invalid, 79 Unknown, 0 Unchecked, 1.50ms Time], IncrementalHoareTripleChecker [5 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 82.42ms Time] [2021-11-13 17:31:05,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-13 17:31:05,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-13 17:31:05,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 51 states have (on average 1.5098039215686274) internal successors, (77), 63 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:05,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 82 transitions. [2021-11-13 17:31:05,260 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 82 transitions. Word has length 14 [2021-11-13 17:31:05,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:05,260 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 82 transitions. [2021-11-13 17:31:05,260 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), 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) [2021-11-13 17:31:05,260 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 82 transitions. [2021-11-13 17:31:05,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-13 17:31:05,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:05,261 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:05,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-13 17:31:05,262 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:05,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:05,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1553442094, now seen corresponding path program 1 times [2021-11-13 17:31:05,263 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:05,263 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053713615] [2021-11-13 17:31:05,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:05,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:05,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:05,346 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:05,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:05,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:05,351 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:05,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053713615] [2021-11-13 17:31:05,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053713615] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:05,351 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995831822] [2021-11-13 17:31:05,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:05,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:05,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:05,353 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:05,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-13 17:31:05,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:05,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-13 17:31:05,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:05,583 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:31:05,584 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:31:05,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:31:05,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:05,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:05,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:05,996 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995831822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:05,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:05,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2021-11-13 17:31:05,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495983683] [2021-11-13 17:31:05,997 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:05,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 17:31:05,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:05,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 17:31:05,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-13 17:31:05,998 INFO L87 Difference]: Start difference. First operand 69 states and 82 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:06,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:06,264 INFO L93 Difference]: Finished difference Result 106 states and 124 transitions. [2021-11-13 17:31:06,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 17:31:06,265 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-13 17:31:06,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:06,266 INFO L225 Difference]: With dead ends: 106 [2021-11-13 17:31:06,266 INFO L226 Difference]: Without dead ends: 106 [2021-11-13 17:31:06,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2021-11-13 17:31:06,268 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 153 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 165.26ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.65ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 197.43ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:06,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 107 Invalid, 226 Unknown, 0 Unchecked, 3.65ms Time], IncrementalHoareTripleChecker [21 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 197.43ms Time] [2021-11-13 17:31:06,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-13 17:31:06,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 64. [2021-11-13 17:31:06,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.4680851063829787) internal successors, (69), 58 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:06,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-13 17:31:06,273 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 15 [2021-11-13 17:31:06,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:06,273 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-13 17:31:06,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:06,273 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-13 17:31:06,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-13 17:31:06,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:06,278 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:06,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:06,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:06,499 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting substringErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:06,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:06,500 INFO L85 PathProgramCache]: Analyzing trace with hash 1661532524, now seen corresponding path program 1 times [2021-11-13 17:31:06,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:06,500 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445962533] [2021-11-13 17:31:06,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:06,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:06,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:06,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:06,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:06,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:06,573 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:06,573 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445962533] [2021-11-13 17:31:06,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445962533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:06,573 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:06,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-13 17:31:06,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512511149] [2021-11-13 17:31:06,574 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:06,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-13 17:31:06,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:06,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-13 17:31:06,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-13 17:31:06,575 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:06,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:06,694 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-13 17:31:06,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-13 17:31:06,694 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-11-13 17:31:06,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:06,695 INFO L225 Difference]: With dead ends: 63 [2021-11-13 17:31:06,695 INFO L226 Difference]: Without dead ends: 63 [2021-11-13 17:31:06,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-13 17:31:06,696 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 94 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 76.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.15ms SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 92.28ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:06,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 69 Invalid, 111 Unknown, 0 Unchecked, 2.15ms Time], IncrementalHoareTripleChecker [6 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 92.28ms Time] [2021-11-13 17:31:06,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-13 17:31:06,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-13 17:31:06,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 47 states have (on average 1.446808510638298) internal successors, (68), 57 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:06,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-11-13 17:31:06,700 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 17 [2021-11-13 17:31:06,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:06,701 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-11-13 17:31:06,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:06,701 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-11-13 17:31:06,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-13 17:31:06,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:06,702 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:06,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-13 17:31:06,702 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:06,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:06,716 INFO L85 PathProgramCache]: Analyzing trace with hash 1661532525, now seen corresponding path program 1 times [2021-11-13 17:31:06,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:06,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302474306] [2021-11-13 17:31:06,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:06,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:06,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:06,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:06,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:06,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:06,822 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:06,822 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302474306] [2021-11-13 17:31:06,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302474306] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:06,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:06,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 17:31:06,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772334845] [2021-11-13 17:31:06,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:06,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 17:31:06,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:06,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 17:31:06,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-13 17:31:06,825 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:07,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:07,059 INFO L93 Difference]: Finished difference Result 85 states and 99 transitions. [2021-11-13 17:31:07,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 17:31:07,060 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-11-13 17:31:07,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:07,063 INFO L225 Difference]: With dead ends: 85 [2021-11-13 17:31:07,063 INFO L226 Difference]: Without dead ends: 85 [2021-11-13 17:31:07,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-13 17:31:07,064 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 162 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 146.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.01ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 175.99ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:07,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 71 Invalid, 210 Unknown, 0 Unchecked, 3.01ms Time], IncrementalHoareTripleChecker [11 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 175.99ms Time] [2021-11-13 17:31:07,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-13 17:31:07,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 64. [2021-11-13 17:31:07,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 48 states have (on average 1.4375) internal successors, (69), 58 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:07,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-11-13 17:31:07,067 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 17 [2021-11-13 17:31:07,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:07,068 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-11-13 17:31:07,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:07,068 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-11-13 17:31:07,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-13 17:31:07,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:07,069 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:07,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-13 17:31:07,070 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:07,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:07,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1317111226, now seen corresponding path program 1 times [2021-11-13 17:31:07,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:07,071 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149474371] [2021-11-13 17:31:07,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:07,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:07,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:07,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:07,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:07,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:07,153 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:07,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149474371] [2021-11-13 17:31:07,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149474371] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:07,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061958322] [2021-11-13 17:31:07,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:07,154 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:07,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:07,159 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:07,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-13 17:31:07,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:07,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-13 17:31:07,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:07,290 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:31:07,291 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:31:07,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:07,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:07,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:07,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061958322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:07,645 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:07,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 11 [2021-11-13 17:31:07,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981443897] [2021-11-13 17:31:07,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:07,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-13 17:31:07,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:07,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-13 17:31:07,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-13 17:31:07,652 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:07,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:07,967 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2021-11-13 17:31:07,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-13 17:31:07,968 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-11-13 17:31:07,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:07,969 INFO L225 Difference]: With dead ends: 78 [2021-11-13 17:31:07,969 INFO L226 Difference]: Without dead ends: 78 [2021-11-13 17:31:07,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2021-11-13 17:31:07,970 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 99 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 197.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.12ms SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 234.42ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:07,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 91 Invalid, 315 Unknown, 0 Unchecked, 4.12ms Time], IncrementalHoareTripleChecker [24 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 234.42ms Time] [2021-11-13 17:31:07,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-13 17:31:07,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 61. [2021-11-13 17:31:07,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 55 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:07,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2021-11-13 17:31:07,974 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 17 [2021-11-13 17:31:07,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:07,975 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2021-11-13 17:31:07,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 11 states have internal predecessors, (29), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:07,975 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2021-11-13 17:31:07,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-13 17:31:07,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:07,976 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:08,015 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:08,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:08,177 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting substringErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:08,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:08,177 INFO L85 PathProgramCache]: Analyzing trace with hash -995076911, now seen corresponding path program 1 times [2021-11-13 17:31:08,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:08,177 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460297253] [2021-11-13 17:31:08,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:08,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:08,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,227 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:08,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:08,235 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:08,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460297253] [2021-11-13 17:31:08,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [460297253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:08,235 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:08,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-13 17:31:08,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822624780] [2021-11-13 17:31:08,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:08,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 17:31:08,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:08,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 17:31:08,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-13 17:31:08,237 INFO L87 Difference]: Start difference. First operand 61 states and 70 transitions. Second operand has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:08,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:08,362 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-13 17:31:08,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 17:31:08,362 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-13 17:31:08,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:08,363 INFO L225 Difference]: With dead ends: 62 [2021-11-13 17:31:08,363 INFO L226 Difference]: Without dead ends: 62 [2021-11-13 17:31:08,364 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-13 17:31:08,364 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 105 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 73.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.25ms SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 89.19ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:08,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 80 Invalid, 141 Unknown, 0 Unchecked, 3.25ms Time], IncrementalHoareTripleChecker [9 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 89.19ms Time] [2021-11-13 17:31:08,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-13 17:31:08,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2021-11-13 17:31:08,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.3478260869565217) internal successors, (62), 52 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:08,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-11-13 17:31:08,367 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 19 [2021-11-13 17:31:08,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:08,368 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-11-13 17:31:08,368 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:08,368 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-11-13 17:31:08,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-13 17:31:08,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:08,369 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:08,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-13 17:31:08,369 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:08,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:08,369 INFO L85 PathProgramCache]: Analyzing trace with hash -995076910, now seen corresponding path program 1 times [2021-11-13 17:31:08,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:08,370 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105535242] [2021-11-13 17:31:08,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:08,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:08,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:08,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:08,459 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:08,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105535242] [2021-11-13 17:31:08,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105535242] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:08,459 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:08,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-13 17:31:08,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425858910] [2021-11-13 17:31:08,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:08,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 17:31:08,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:08,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 17:31:08,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-13 17:31:08,466 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:08,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:08,779 INFO L93 Difference]: Finished difference Result 75 states and 88 transitions. [2021-11-13 17:31:08,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 17:31:08,780 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-13 17:31:08,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:08,781 INFO L225 Difference]: With dead ends: 75 [2021-11-13 17:31:08,781 INFO L226 Difference]: Without dead ends: 75 [2021-11-13 17:31:08,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-13 17:31:08,782 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 164 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 172.31ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.22ms SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 222.35ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:08,782 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 87 Invalid, 231 Unknown, 0 Unchecked, 4.22ms Time], IncrementalHoareTripleChecker [12 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 222.35ms Time] [2021-11-13 17:31:08,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-13 17:31:08,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 66. [2021-11-13 17:31:08,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 54 states have (on average 1.3703703703703705) internal successors, (74), 60 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:08,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 79 transitions. [2021-11-13 17:31:08,789 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 79 transitions. Word has length 19 [2021-11-13 17:31:08,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:08,789 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 79 transitions. [2021-11-13 17:31:08,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:08,790 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 79 transitions. [2021-11-13 17:31:08,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-13 17:31:08,790 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:08,790 INFO L514 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] [2021-11-13 17:31:08,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-13 17:31:08,791 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:08,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:08,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1744606647, now seen corresponding path program 1 times [2021-11-13 17:31:08,791 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:08,791 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335343253] [2021-11-13 17:31:08,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:08,792 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:08,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:08,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:08,820 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:08,821 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335343253] [2021-11-13 17:31:08,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335343253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:08,821 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:08,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 17:31:08,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721173658] [2021-11-13 17:31:08,821 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:08,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-13 17:31:08,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:08,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-13 17:31:08,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-13 17:31:08,822 INFO L87 Difference]: Start difference. First operand 66 states and 79 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:08,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:08,887 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2021-11-13 17:31:08,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 17:31:08,888 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-11-13 17:31:08,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:08,888 INFO L225 Difference]: With dead ends: 68 [2021-11-13 17:31:08,889 INFO L226 Difference]: Without dead ends: 68 [2021-11-13 17:31:08,889 INFO L932 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 [2021-11-13 17:31:08,889 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 29 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.35ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 53.75ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:08,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 66 Invalid, 60 Unknown, 0 Unchecked, 1.35ms Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 53.75ms Time] [2021-11-13 17:31:08,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-13 17:31:08,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-13 17:31:08,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 56 states have (on average 1.3571428571428572) internal successors, (76), 62 states have internal predecessors, (76), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:08,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 81 transitions. [2021-11-13 17:31:08,893 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 81 transitions. Word has length 23 [2021-11-13 17:31:08,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:08,893 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 81 transitions. [2021-11-13 17:31:08,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:08,894 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 81 transitions. [2021-11-13 17:31:08,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-13 17:31:08,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:08,894 INFO L514 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] [2021-11-13 17:31:08,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-13 17:31:08,895 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting substringErr6REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:08,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:08,895 INFO L85 PathProgramCache]: Analyzing trace with hash -1744615721, now seen corresponding path program 1 times [2021-11-13 17:31:08,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:08,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953170133] [2021-11-13 17:31:08,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:08,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:08,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:08,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:08,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:08,943 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:08,943 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953170133] [2021-11-13 17:31:08,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953170133] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:08,944 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:08,944 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-13 17:31:08,944 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113554145] [2021-11-13 17:31:08,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:08,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 17:31:08,945 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:08,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 17:31:08,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-13 17:31:08,945 INFO L87 Difference]: Start difference. First operand 68 states and 81 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:09,093 INFO L93 Difference]: Finished difference Result 71 states and 84 transitions. [2021-11-13 17:31:09,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-13 17:31:09,093 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-11-13 17:31:09,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:09,095 INFO L225 Difference]: With dead ends: 71 [2021-11-13 17:31:09,095 INFO L226 Difference]: Without dead ends: 71 [2021-11-13 17:31:09,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-13 17:31:09,097 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 92 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 89.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.28ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 106.12ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:09,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 80 Invalid, 141 Unknown, 0 Unchecked, 2.28ms Time], IncrementalHoareTripleChecker [11 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 106.12ms Time] [2021-11-13 17:31:09,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-13 17:31:09,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2021-11-13 17:31:09,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 56 states have (on average 1.3214285714285714) internal successors, (74), 61 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:09,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-11-13 17:31:09,102 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 23 [2021-11-13 17:31:09,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:09,103 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-11-13 17:31:09,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,103 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-11-13 17:31:09,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-13 17:31:09,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:09,106 INFO L514 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] [2021-11-13 17:31:09,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-13 17:31:09,106 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:09,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:09,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1744615720, now seen corresponding path program 1 times [2021-11-13 17:31:09,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:09,108 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860127864] [2021-11-13 17:31:09,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:09,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:09,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,184 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:09,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:09,200 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:09,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860127864] [2021-11-13 17:31:09,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860127864] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:09,201 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:09,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 17:31:09,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251312358] [2021-11-13 17:31:09,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:09,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-13 17:31:09,203 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:09,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-13 17:31:09,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-13 17:31:09,204 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:09,471 INFO L93 Difference]: Finished difference Result 103 states and 123 transitions. [2021-11-13 17:31:09,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 17:31:09,472 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-11-13 17:31:09,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:09,473 INFO L225 Difference]: With dead ends: 103 [2021-11-13 17:31:09,473 INFO L226 Difference]: Without dead ends: 103 [2021-11-13 17:31:09,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-11-13 17:31:09,474 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 175 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 139.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.85ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 171.14ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:09,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 110 Invalid, 200 Unknown, 0 Unchecked, 3.85ms Time], IncrementalHoareTripleChecker [10 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 171.14ms Time] [2021-11-13 17:31:09,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-13 17:31:09,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 73. [2021-11-13 17:31:09,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 62 states have (on average 1.3225806451612903) internal successors, (82), 67 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:09,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-11-13 17:31:09,478 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 23 [2021-11-13 17:31:09,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:09,479 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-11-13 17:31:09,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,479 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-11-13 17:31:09,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-13 17:31:09,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:09,480 INFO L514 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] [2021-11-13 17:31:09,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-13 17:31:09,480 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:09,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:09,481 INFO L85 PathProgramCache]: Analyzing trace with hash -1768533058, now seen corresponding path program 1 times [2021-11-13 17:31:09,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:09,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220381239] [2021-11-13 17:31:09,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:09,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:09,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:09,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-11-13 17:31:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:09,575 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:09,575 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220381239] [2021-11-13 17:31:09,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220381239] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:09,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:09,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-13 17:31:09,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79968894] [2021-11-13 17:31:09,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:09,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-13 17:31:09,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:09,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-13 17:31:09,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:09,578 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:09,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:09,652 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2021-11-13 17:31:09,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-13 17:31:09,653 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2021-11-13 17:31:09,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:09,654 INFO L225 Difference]: With dead ends: 72 [2021-11-13 17:31:09,654 INFO L226 Difference]: Without dead ends: 67 [2021-11-13 17:31:09,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-13 17:31:09,655 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 61 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 58.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.26ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 69.54ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:09,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 50 Invalid, 58 Unknown, 0 Unchecked, 1.26ms Time], IncrementalHoareTripleChecker [5 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 69.54ms Time] [2021-11-13 17:31:09,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-13 17:31:09,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-11-13 17:31:09,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 58 states have (on average 1.293103448275862) internal successors, (75), 62 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2021-11-13 17:31:09,659 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 23 [2021-11-13 17:31:09,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:09,659 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2021-11-13 17:31:09,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-13 17:31:09,660 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2021-11-13 17:31:09,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-13 17:31:09,660 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:09,660 INFO L514 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] [2021-11-13 17:31:09,661 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-13 17:31:09,661 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:09,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:09,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1529776103, now seen corresponding path program 1 times [2021-11-13 17:31:09,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:09,662 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220808816] [2021-11-13 17:31:09,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:09,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:09,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:09,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:09,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:09,726 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:09,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220808816] [2021-11-13 17:31:09,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220808816] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:09,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:09,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-13 17:31:09,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422736473] [2021-11-13 17:31:09,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:09,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-13 17:31:09,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:09,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-13 17:31:09,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-13 17:31:09,729 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:09,887 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2021-11-13 17:31:09,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-13 17:31:09,888 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-11-13 17:31:09,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:09,888 INFO L225 Difference]: With dead ends: 71 [2021-11-13 17:31:09,889 INFO L226 Difference]: Without dead ends: 68 [2021-11-13 17:31:09,889 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-11-13 17:31:09,890 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 42 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 80.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.05ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 95.06ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:09,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 93 Invalid, 131 Unknown, 0 Unchecked, 3.05ms Time], IncrementalHoareTripleChecker [4 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 95.06ms Time] [2021-11-13 17:31:09,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-13 17:31:09,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-11-13 17:31:09,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 58 states have (on average 1.2586206896551724) internal successors, (73), 62 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2021-11-13 17:31:09,893 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 25 [2021-11-13 17:31:09,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:09,893 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2021-11-13 17:31:09,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:09,894 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2021-11-13 17:31:09,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 17:31:09,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:09,894 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:09,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-13 17:31:09,895 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:09,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:09,895 INFO L85 PathProgramCache]: Analyzing trace with hash -447626662, now seen corresponding path program 1 times [2021-11-13 17:31:09,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:09,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751139377] [2021-11-13 17:31:09,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:09,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:09,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:10,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:10,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:10,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:10,049 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:10,049 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751139377] [2021-11-13 17:31:10,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751139377] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:10,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:10,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-13 17:31:10,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785410479] [2021-11-13 17:31:10,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:10,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-13 17:31:10,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:10,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-13 17:31:10,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-13 17:31:10,053 INFO L87 Difference]: Start difference. First operand 67 states and 77 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:10,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:10,248 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2021-11-13 17:31:10,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-13 17:31:10,249 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-13 17:31:10,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:10,250 INFO L225 Difference]: With dead ends: 80 [2021-11-13 17:31:10,250 INFO L226 Difference]: Without dead ends: 62 [2021-11-13 17:31:10,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-13 17:31:10,251 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 40 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 111.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.51ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 133.91ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:10,251 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 109 Invalid, 220 Unknown, 0 Unchecked, 2.51ms Time], IncrementalHoareTripleChecker [5 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 133.91ms Time] [2021-11-13 17:31:10,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-13 17:31:10,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-13 17:31:10,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 53 states have (on average 1.2452830188679245) internal successors, (66), 57 states have internal predecessors, (66), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:10,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2021-11-13 17:31:10,254 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 26 [2021-11-13 17:31:10,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:10,254 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2021-11-13 17:31:10,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:10,255 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2021-11-13 17:31:10,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-13 17:31:10,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:10,255 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:10,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-13 17:31:10,256 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:10,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:10,256 INFO L85 PathProgramCache]: Analyzing trace with hash -1265275112, now seen corresponding path program 1 times [2021-11-13 17:31:10,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:10,256 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397252025] [2021-11-13 17:31:10,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:10,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:10,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:10,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:10,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:10,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:10,437 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:10,437 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397252025] [2021-11-13 17:31:10,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397252025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:10,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:10,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-13 17:31:10,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072689587] [2021-11-13 17:31:10,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:10,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-13 17:31:10,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:10,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-13 17:31:10,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-13 17:31:10,443 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:10,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:10,657 INFO L93 Difference]: Finished difference Result 83 states and 93 transitions. [2021-11-13 17:31:10,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-13 17:31:10,658 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-13 17:31:10,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:10,659 INFO L225 Difference]: With dead ends: 83 [2021-11-13 17:31:10,659 INFO L226 Difference]: Without dead ends: 70 [2021-11-13 17:31:10,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-13 17:31:10,660 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 69 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 114.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.87ms SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 138.77ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:10,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 81 Invalid, 205 Unknown, 0 Unchecked, 5.87ms Time], IncrementalHoareTripleChecker [8 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 138.77ms Time] [2021-11-13 17:31:10,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-13 17:31:10,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-11-13 17:31:10,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 59 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:10,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2021-11-13 17:31:10,663 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 26 [2021-11-13 17:31:10,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:10,663 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2021-11-13 17:31:10,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 8 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:10,664 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2021-11-13 17:31:10,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 17:31:10,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:10,664 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:10,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-13 17:31:10,664 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:10,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:10,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1692710901, now seen corresponding path program 1 times [2021-11-13 17:31:10,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:10,665 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914719416] [2021-11-13 17:31:10,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:10,665 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:10,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:10,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:10,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:10,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:10,818 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:10,818 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914719416] [2021-11-13 17:31:10,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914719416] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:10,819 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:10,819 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-13 17:31:10,819 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008087305] [2021-11-13 17:31:10,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:10,820 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-13 17:31:10,820 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:10,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-13 17:31:10,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-13 17:31:10,820 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 11 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:11,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:11,114 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2021-11-13 17:31:11,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 17:31:11,116 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-13 17:31:11,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:11,116 INFO L225 Difference]: With dead ends: 73 [2021-11-13 17:31:11,116 INFO L226 Difference]: Without dead ends: 56 [2021-11-13 17:31:11,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2021-11-13 17:31:11,117 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 48 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 125.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.37ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 154.90ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:11,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 142 Invalid, 274 Unknown, 0 Unchecked, 3.37ms Time], IncrementalHoareTripleChecker [5 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 154.90ms Time] [2021-11-13 17:31:11,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-13 17:31:11,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-13 17:31:11,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 51 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:11,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-11-13 17:31:11,119 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 30 [2021-11-13 17:31:11,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:11,119 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-11-13 17:31:11,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:11,120 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-11-13 17:31:11,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-13 17:31:11,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:11,120 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:11,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-13 17:31:11,120 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:11,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:11,121 INFO L85 PathProgramCache]: Analyzing trace with hash -112727433, now seen corresponding path program 1 times [2021-11-13 17:31:11,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:11,121 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932577168] [2021-11-13 17:31:11,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:11,121 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:11,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:11,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:11,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:11,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:11,292 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:11,292 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932577168] [2021-11-13 17:31:11,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932577168] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-13 17:31:11,292 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-13 17:31:11,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-13 17:31:11,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072886446] [2021-11-13 17:31:11,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-13 17:31:11,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-13 17:31:11,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:11,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-13 17:31:11,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-11-13 17:31:11,295 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:11,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:11,583 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2021-11-13 17:31:11,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 17:31:11,584 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-13 17:31:11,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:11,584 INFO L225 Difference]: With dead ends: 69 [2021-11-13 17:31:11,584 INFO L226 Difference]: Without dead ends: 60 [2021-11-13 17:31:11,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-13 17:31:11,585 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 66 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 144.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.28ms SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 174.96ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:11,586 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 114 Invalid, 285 Unknown, 0 Unchecked, 9.28ms Time], IncrementalHoareTripleChecker [7 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 174.96ms Time] [2021-11-13 17:31:11,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-13 17:31:11,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2021-11-13 17:31:11,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 52 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:11,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-11-13 17:31:11,588 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 30 [2021-11-13 17:31:11,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:11,589 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-11-13 17:31:11,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:11,589 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-11-13 17:31:11,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-13 17:31:11,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:11,590 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:11,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-13 17:31:11,590 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:11,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:11,590 INFO L85 PathProgramCache]: Analyzing trace with hash -147074924, now seen corresponding path program 1 times [2021-11-13 17:31:11,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:11,591 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675558926] [2021-11-13 17:31:11,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:11,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:11,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:11,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:11,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:11,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:11,741 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:11,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675558926] [2021-11-13 17:31:11,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675558926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:11,741 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481853795] [2021-11-13 17:31:11,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:11,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:11,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:11,742 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:11,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-13 17:31:11,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:11,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-13 17:31:11,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:12,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:12,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:12,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-13 17:31:12,342 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:12,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481853795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:12,342 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:12,343 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 24 [2021-11-13 17:31:12,343 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409677752] [2021-11-13 17:31:12,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:12,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-13 17:31:12,344 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:12,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-13 17:31:12,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2021-11-13 17:31:12,345 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand has 25 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:12,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:12,752 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-11-13 17:31:12,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 17:31:12,753 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-11-13 17:31:12,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:12,754 INFO L225 Difference]: With dead ends: 78 [2021-11-13 17:31:12,754 INFO L226 Difference]: Without dead ends: 74 [2021-11-13 17:31:12,754 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=776, Unknown=0, NotChecked=0, Total=930 [2021-11-13 17:31:12,755 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 240 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 224.83ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.79ms SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 276.65ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:12,755 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [240 Valid, 167 Invalid, 502 Unknown, 0 Unchecked, 4.79ms Time], IncrementalHoareTripleChecker [29 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 276.65ms Time] [2021-11-13 17:31:12,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-13 17:31:12,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 53. [2021-11-13 17:31:12,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 46 states have (on average 1.173913043478261) internal successors, (54), 48 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:12,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-11-13 17:31:12,758 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 34 [2021-11-13 17:31:12,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:12,758 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-11-13 17:31:12,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:12,759 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-11-13 17:31:12,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-13 17:31:12,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:12,759 INFO L514 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] [2021-11-13 17:31:12,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:12,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-13 17:31:12,960 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:12,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:12,960 INFO L85 PathProgramCache]: Analyzing trace with hash 394885028, now seen corresponding path program 1 times [2021-11-13 17:31:12,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:12,960 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130407411] [2021-11-13 17:31:12,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:12,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:12,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:13,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:13,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:13,094 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:13,095 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:13,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130407411] [2021-11-13 17:31:13,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [130407411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:13,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201002031] [2021-11-13 17:31:13,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:13,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:13,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:13,097 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:13,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-13 17:31:13,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:13,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 17:31:13,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:13,241 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:31:13,241 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:31:13,752 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:13,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:14,281 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:14,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201002031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:14,282 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:14,282 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 26 [2021-11-13 17:31:14,282 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530254442] [2021-11-13 17:31:14,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:14,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-13 17:31:14,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:14,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-13 17:31:14,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2021-11-13 17:31:14,284 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 27 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:14,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:14,933 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2021-11-13 17:31:14,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-13 17:31:14,934 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-11-13 17:31:14,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:14,935 INFO L225 Difference]: With dead ends: 91 [2021-11-13 17:31:14,935 INFO L226 Difference]: Without dead ends: 91 [2021-11-13 17:31:14,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=185, Invalid=1075, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 17:31:14,937 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 234 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 270.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.06ms SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 331.18ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:14,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 102 Invalid, 516 Unknown, 0 Unchecked, 6.06ms Time], IncrementalHoareTripleChecker [26 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 331.18ms Time] [2021-11-13 17:31:14,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-13 17:31:14,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 66. [2021-11-13 17:31:14,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 59 states have (on average 1.2033898305084745) internal successors, (71), 61 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:14,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 75 transitions. [2021-11-13 17:31:14,940 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 75 transitions. Word has length 36 [2021-11-13 17:31:14,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:14,941 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 75 transitions. [2021-11-13 17:31:14,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 3.25) internal successors, (78), 23 states have internal predecessors, (78), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:14,941 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 75 transitions. [2021-11-13 17:31:14,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-13 17:31:14,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:14,942 INFO L514 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] [2021-11-13 17:31:14,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:15,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-13 17:31:15,159 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:15,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:15,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1560744346, now seen corresponding path program 1 times [2021-11-13 17:31:15,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:15,160 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645155599] [2021-11-13 17:31:15,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:15,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:15,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:15,330 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:15,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:15,334 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:15,334 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:15,334 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645155599] [2021-11-13 17:31:15,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645155599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:15,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113333767] [2021-11-13 17:31:15,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:15,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:15,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:15,340 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:15,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-13 17:31:15,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:15,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 17:31:15,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:15,487 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:31:15,487 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:31:15,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:31:15,764 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:15,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:16,160 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:16,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113333767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:16,160 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:16,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2021-11-13 17:31:16,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124248265] [2021-11-13 17:31:16,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:16,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 17:31:16,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:16,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 17:31:16,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2021-11-13 17:31:16,162 INFO L87 Difference]: Start difference. First operand 66 states and 75 transitions. Second operand has 24 states, 23 states have (on average 4.0) internal successors, (92), 20 states have internal predecessors, (92), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:16,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:16,788 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2021-11-13 17:31:16,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 17:31:16,789 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.0) internal successors, (92), 20 states have internal predecessors, (92), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-11-13 17:31:16,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:16,789 INFO L225 Difference]: With dead ends: 85 [2021-11-13 17:31:16,790 INFO L226 Difference]: Without dead ends: 85 [2021-11-13 17:31:16,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=191, Invalid=999, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 17:31:16,791 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 212 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 270.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.43ms SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 340.98ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:16,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 174 Invalid, 635 Unknown, 0 Unchecked, 9.43ms Time], IncrementalHoareTripleChecker [35 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 340.98ms Time] [2021-11-13 17:31:16,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-13 17:31:16,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 70. [2021-11-13 17:31:16,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 63 states have (on average 1.1904761904761905) internal successors, (75), 65 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:16,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 79 transitions. [2021-11-13 17:31:16,794 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 79 transitions. Word has length 38 [2021-11-13 17:31:16,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:16,798 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 79 transitions. [2021-11-13 17:31:16,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.0) internal successors, (92), 20 states have internal predecessors, (92), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:16,799 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 79 transitions. [2021-11-13 17:31:16,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-13 17:31:16,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:16,800 INFO L514 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] [2021-11-13 17:31:16,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:17,015 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-13 17:31:17,016 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:17,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:17,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1181095848, now seen corresponding path program 2 times [2021-11-13 17:31:17,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:17,016 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49096638] [2021-11-13 17:31:17,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:17,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:17,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:17,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:17,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:17,264 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:17,264 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:17,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49096638] [2021-11-13 17:31:17,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49096638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:17,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248761023] [2021-11-13 17:31:17,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:31:17,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:17,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:17,266 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:17,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-13 17:31:17,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:31:17,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:31:17,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 17:31:17,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:17,467 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 25 treesize of output 21 [2021-11-13 17:31:18,159 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:31:18,159 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 33 treesize of output 33 [2021-11-13 17:31:18,404 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:18,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:19,064 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 36 treesize of output 34 [2021-11-13 17:31:19,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2021-11-13 17:31:19,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2021-11-13 17:31:19,148 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:19,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248761023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:19,148 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:19,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 37 [2021-11-13 17:31:19,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033165191] [2021-11-13 17:31:19,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:19,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-13 17:31:19,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:19,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-13 17:31:19,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1210, Unknown=0, NotChecked=0, Total=1332 [2021-11-13 17:31:19,151 INFO L87 Difference]: Start difference. First operand 70 states and 79 transitions. Second operand has 37 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 33 states have internal predecessors, (89), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:20,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:20,294 INFO L93 Difference]: Finished difference Result 116 states and 128 transitions. [2021-11-13 17:31:20,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 17:31:20,295 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 33 states have internal predecessors, (89), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-11-13 17:31:20,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:20,296 INFO L225 Difference]: With dead ends: 116 [2021-11-13 17:31:20,297 INFO L226 Difference]: Without dead ends: 113 [2021-11-13 17:31:20,298 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 62 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=246, Invalid=2406, Unknown=0, NotChecked=0, Total=2652 [2021-11-13 17:31:20,299 INFO L933 BasicCegarLoop]: 39 mSDtfsCounter, 138 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 962 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 432.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 1295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.87ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 962 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 319 IncrementalHoareTripleChecker+Unchecked, 525.15ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:20,299 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 385 Invalid, 1295 Unknown, 0 Unchecked, 6.87ms Time], IncrementalHoareTripleChecker [14 Valid, 962 Invalid, 0 Unknown, 319 Unchecked, 525.15ms Time] [2021-11-13 17:31:20,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-13 17:31:20,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 90. [2021-11-13 17:31:20,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 82 states have (on average 1.170731707317073) internal successors, (96), 84 states have internal predecessors, (96), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:20,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 101 transitions. [2021-11-13 17:31:20,304 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 101 transitions. Word has length 41 [2021-11-13 17:31:20,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:20,304 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 101 transitions. [2021-11-13 17:31:20,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.6176470588235294) internal successors, (89), 33 states have internal predecessors, (89), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:20,305 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 101 transitions. [2021-11-13 17:31:20,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-13 17:31:20,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:20,305 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:20,340 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:20,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-13 17:31:20,519 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:20,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:20,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1692139569, now seen corresponding path program 1 times [2021-11-13 17:31:20,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:20,520 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714153755] [2021-11-13 17:31:20,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:20,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:20,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:20,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:20,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:20,684 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:20,684 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:20,684 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714153755] [2021-11-13 17:31:20,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714153755] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:20,685 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617055352] [2021-11-13 17:31:20,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:20,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:20,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:20,686 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:20,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-13 17:31:20,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:20,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 17:31:20,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:20,820 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:31:20,820 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:31:20,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:31:21,141 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:21,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:21,511 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:21,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617055352] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:21,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:21,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2021-11-13 17:31:21,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094978533] [2021-11-13 17:31:21,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:21,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-13 17:31:21,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:21,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-13 17:31:21,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2021-11-13 17:31:21,513 INFO L87 Difference]: Start difference. First operand 90 states and 101 transitions. Second operand has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 20 states have internal predecessors, (96), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:22,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:22,172 INFO L93 Difference]: Finished difference Result 120 states and 130 transitions. [2021-11-13 17:31:22,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-13 17:31:22,172 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 20 states have internal predecessors, (96), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-11-13 17:31:22,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:22,173 INFO L225 Difference]: With dead ends: 120 [2021-11-13 17:31:22,173 INFO L226 Difference]: Without dead ends: 120 [2021-11-13 17:31:22,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=229, Invalid=1177, Unknown=0, NotChecked=0, Total=1406 [2021-11-13 17:31:22,174 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 256 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 259.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.18ms SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 326.83ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:22,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [256 Valid, 158 Invalid, 559 Unknown, 0 Unchecked, 4.18ms Time], IncrementalHoareTripleChecker [53 Valid, 506 Invalid, 0 Unknown, 0 Unchecked, 326.83ms Time] [2021-11-13 17:31:22,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-13 17:31:22,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 90. [2021-11-13 17:31:22,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 82 states have (on average 1.1585365853658536) internal successors, (95), 84 states have internal predecessors, (95), 4 states have call successors, (4), 4 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:22,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 100 transitions. [2021-11-13 17:31:22,179 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 100 transitions. Word has length 42 [2021-11-13 17:31:22,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:22,179 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 100 transitions. [2021-11-13 17:31:22,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 4.173913043478261) internal successors, (96), 20 states have internal predecessors, (96), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:22,180 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 100 transitions. [2021-11-13 17:31:22,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-13 17:31:22,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:22,180 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:22,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:22,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:22,395 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:22,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:22,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1777949011, now seen corresponding path program 2 times [2021-11-13 17:31:22,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:22,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495341092] [2021-11-13 17:31:22,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:22,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:22,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:22,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:22,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:22,646 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:22,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:22,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495341092] [2021-11-13 17:31:22,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495341092] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:22,647 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665205143] [2021-11-13 17:31:22,647 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:31:22,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:22,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:22,651 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:22,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-13 17:31:22,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:31:22,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:31:22,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-13 17:31:22,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:22,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:31:22,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:31:23,032 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:31:23,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:31:23,870 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-13 17:31:23,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 34 [2021-11-13 17:31:23,914 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:23,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:26,756 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 62 treesize of output 56 [2021-11-13 17:31:27,138 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:27,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665205143] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:27,138 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:27,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 33 [2021-11-13 17:31:27,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683982492] [2021-11-13 17:31:27,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:27,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-13 17:31:27,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:27,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-13 17:31:27,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=941, Unknown=1, NotChecked=0, Total=1056 [2021-11-13 17:31:27,140 INFO L87 Difference]: Start difference. First operand 90 states and 100 transitions. Second operand has 33 states, 31 states have (on average 3.193548387096774) internal successors, (99), 29 states have internal predecessors, (99), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:27,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:27,693 INFO L93 Difference]: Finished difference Result 154 states and 169 transitions. [2021-11-13 17:31:27,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 17:31:27,694 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 3.193548387096774) internal successors, (99), 29 states have internal predecessors, (99), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-11-13 17:31:27,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:27,695 INFO L225 Difference]: With dead ends: 154 [2021-11-13 17:31:27,695 INFO L226 Difference]: Without dead ends: 137 [2021-11-13 17:31:27,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=167, Invalid=1238, Unknown=1, NotChecked=0, Total=1406 [2021-11-13 17:31:27,701 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 73 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 352 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 194.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.46ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 352 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 253.58ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:27,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 321 Invalid, 540 Unknown, 0 Unchecked, 3.46ms Time], IncrementalHoareTripleChecker [11 Valid, 352 Invalid, 0 Unknown, 177 Unchecked, 253.58ms Time] [2021-11-13 17:31:27,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-13 17:31:27,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 132. [2021-11-13 17:31:27,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 123 states have (on average 1.1382113821138211) internal successors, (140), 125 states have internal predecessors, (140), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:27,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 146 transitions. [2021-11-13 17:31:27,708 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 146 transitions. Word has length 47 [2021-11-13 17:31:27,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:27,709 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 146 transitions. [2021-11-13 17:31:27,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 3.193548387096774) internal successors, (99), 29 states have internal predecessors, (99), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:27,709 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 146 transitions. [2021-11-13 17:31:27,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-13 17:31:27,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:27,710 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2021-11-13 17:31:27,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:27,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-13 17:31:27,935 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:27,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:27,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1479203935, now seen corresponding path program 2 times [2021-11-13 17:31:27,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:27,936 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [688418003] [2021-11-13 17:31:27,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:27,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:27,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:28,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:28,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:28,603 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:31:28,603 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:28,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [688418003] [2021-11-13 17:31:28,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [688418003] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:28,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353487268] [2021-11-13 17:31:28,604 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:31:28,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:28,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:28,608 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:28,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-13 17:31:28,718 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:31:28,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:31:28,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 17:31:28,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:28,753 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:31:28,753 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:31:29,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:31:29,490 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-13 17:31:29,490 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 34 treesize of output 25 [2021-11-13 17:31:29,504 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:29,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:30,204 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 24 treesize of output 22 [2021-11-13 17:31:30,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-13 17:31:30,790 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:30,790 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353487268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:30,791 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:30,791 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 16] total 45 [2021-11-13 17:31:30,791 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382049843] [2021-11-13 17:31:30,791 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:30,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 17:31:30,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:30,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 17:31:30,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1832, Unknown=0, NotChecked=0, Total=1980 [2021-11-13 17:31:30,792 INFO L87 Difference]: Start difference. First operand 132 states and 146 transitions. Second operand has 45 states, 42 states have (on average 2.8095238095238093) internal successors, (118), 41 states have internal predecessors, (118), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:33,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:33,330 INFO L93 Difference]: Finished difference Result 230 states and 247 transitions. [2021-11-13 17:31:33,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-13 17:31:33,337 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 2.8095238095238093) internal successors, (118), 41 states have internal predecessors, (118), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-11-13 17:31:33,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:33,338 INFO L225 Difference]: With dead ends: 230 [2021-11-13 17:31:33,338 INFO L226 Difference]: Without dead ends: 202 [2021-11-13 17:31:33,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=579, Invalid=5273, Unknown=0, NotChecked=0, Total=5852 [2021-11-13 17:31:33,340 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 382 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 1484 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 812.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 1884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.69ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 359 IncrementalHoareTripleChecker+Unchecked, 973.03ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:33,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 276 Invalid, 1884 Unknown, 0 Unchecked, 6.69ms Time], IncrementalHoareTripleChecker [41 Valid, 1484 Invalid, 0 Unknown, 359 Unchecked, 973.03ms Time] [2021-11-13 17:31:33,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-13 17:31:33,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 182. [2021-11-13 17:31:33,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 172 states have (on average 1.1337209302325582) internal successors, (195), 174 states have internal predecessors, (195), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:33,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 202 transitions. [2021-11-13 17:31:33,362 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 202 transitions. Word has length 49 [2021-11-13 17:31:33,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:33,362 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 202 transitions. [2021-11-13 17:31:33,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 42 states have (on average 2.8095238095238093) internal successors, (118), 41 states have internal predecessors, (118), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:33,363 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 202 transitions. [2021-11-13 17:31:33,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-13 17:31:33,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:33,364 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:33,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:33,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:33,566 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:33,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:33,566 INFO L85 PathProgramCache]: Analyzing trace with hash -426369642, now seen corresponding path program 3 times [2021-11-13 17:31:33,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:33,567 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326295001] [2021-11-13 17:31:33,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:33,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:33,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:33,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:33,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:33,719 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:33,719 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:33,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326295001] [2021-11-13 17:31:33,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326295001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:33,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1892611316] [2021-11-13 17:31:33,720 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:31:33,720 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:33,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:33,724 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:33,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-13 17:31:33,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-13 17:31:33,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:31:33,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-13 17:31:33,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:34,154 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:34,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:34,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-13 17:31:34,554 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 1 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:34,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1892611316] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:34,555 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:34,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 27 [2021-11-13 17:31:34,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173238045] [2021-11-13 17:31:34,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:34,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-13 17:31:34,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:34,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-13 17:31:34,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=658, Unknown=0, NotChecked=0, Total=756 [2021-11-13 17:31:34,557 INFO L87 Difference]: Start difference. First operand 182 states and 202 transitions. Second operand has 28 states, 27 states have (on average 4.296296296296297) internal successors, (116), 24 states have internal predecessors, (116), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:35,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:35,232 INFO L93 Difference]: Finished difference Result 270 states and 296 transitions. [2021-11-13 17:31:35,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-13 17:31:35,233 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.296296296296297) internal successors, (116), 24 states have internal predecessors, (116), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-11-13 17:31:35,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:35,234 INFO L225 Difference]: With dead ends: 270 [2021-11-13 17:31:35,234 INFO L226 Difference]: Without dead ends: 270 [2021-11-13 17:31:35,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=221, Invalid=1185, Unknown=0, NotChecked=0, Total=1406 [2021-11-13 17:31:35,235 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 350 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 913 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 364.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.59ms SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 913 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 449.27ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:35,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 268 Invalid, 960 Unknown, 0 Unchecked, 3.59ms Time], IncrementalHoareTripleChecker [47 Valid, 913 Invalid, 0 Unknown, 0 Unchecked, 449.27ms Time] [2021-11-13 17:31:35,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-13 17:31:35,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 219. [2021-11-13 17:31:35,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 209 states have (on average 1.1435406698564594) internal successors, (239), 211 states have internal predecessors, (239), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:35,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 246 transitions. [2021-11-13 17:31:35,246 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 246 transitions. Word has length 51 [2021-11-13 17:31:35,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:35,247 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 246 transitions. [2021-11-13 17:31:35,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.296296296296297) internal successors, (116), 24 states have internal predecessors, (116), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:35,247 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 246 transitions. [2021-11-13 17:31:35,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 17:31:35,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:35,248 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:31:35,272 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:35,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:35,455 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:35,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:35,456 INFO L85 PathProgramCache]: Analyzing trace with hash -1427061148, now seen corresponding path program 3 times [2021-11-13 17:31:35,456 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:35,456 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058506087] [2021-11-13 17:31:35,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:35,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:35,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:35,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:35,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:35,913 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:31:35,913 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:35,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058506087] [2021-11-13 17:31:35,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058506087] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:35,914 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807187969] [2021-11-13 17:31:35,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:31:35,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:35,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:35,928 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:35,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-13 17:31:36,040 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-13 17:31:36,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:31:36,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 17:31:36,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:36,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:31:36,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:31:36,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-13 17:31:38,229 INFO L354 Elim1Store]: treesize reduction 71, result has 14.5 percent of original size [2021-11-13 17:31:38,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 64 treesize of output 49 [2021-11-13 17:31:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:31:38,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:43,921 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-13 17:31:43,921 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 2 case distinctions, treesize of input 213 treesize of output 173 [2021-11-13 17:31:43,932 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:31:43,932 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 169 treesize of output 163 [2021-11-13 17:31:44,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 50 [2021-11-13 17:31:44,177 INFO L354 Elim1Store]: treesize reduction 5, result has 85.7 percent of original size [2021-11-13 17:31:44,177 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 76 treesize of output 84 [2021-11-13 17:31:44,764 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 10 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:31:44,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807187969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:44,764 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:44,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 51 [2021-11-13 17:31:44,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678796296] [2021-11-13 17:31:44,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:44,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 17:31:44,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:44,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 17:31:44,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=2358, Unknown=4, NotChecked=0, Total=2550 [2021-11-13 17:31:44,767 INFO L87 Difference]: Start difference. First operand 219 states and 246 transitions. Second operand has 51 states, 49 states have (on average 2.1020408163265305) internal successors, (103), 47 states have internal predecessors, (103), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:45,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:45,741 INFO L93 Difference]: Finished difference Result 214 states and 238 transitions. [2021-11-13 17:31:45,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 17:31:45,742 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 2.1020408163265305) internal successors, (103), 47 states have internal predecessors, (103), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-11-13 17:31:45,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:45,743 INFO L225 Difference]: With dead ends: 214 [2021-11-13 17:31:45,743 INFO L226 Difference]: Without dead ends: 180 [2021-11-13 17:31:45,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 843 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=303, Invalid=3475, Unknown=4, NotChecked=0, Total=3782 [2021-11-13 17:31:45,745 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 106 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 214.73ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.04ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 370 IncrementalHoareTripleChecker+Unchecked, 254.99ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:45,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 385 Invalid, 803 Unknown, 0 Unchecked, 3.04ms Time], IncrementalHoareTripleChecker [16 Valid, 417 Invalid, 0 Unknown, 370 Unchecked, 254.99ms Time] [2021-11-13 17:31:45,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-13 17:31:45,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 177. [2021-11-13 17:31:45,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 168 states have (on average 1.1547619047619047) internal successors, (194), 170 states have internal predecessors, (194), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:45,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 200 transitions. [2021-11-13 17:31:45,754 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 200 transitions. Word has length 53 [2021-11-13 17:31:45,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:45,754 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 200 transitions. [2021-11-13 17:31:45,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 2.1020408163265305) internal successors, (103), 47 states have internal predecessors, (103), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:45,754 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 200 transitions. [2021-11-13 17:31:45,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-13 17:31:45,755 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:45,756 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2021-11-13 17:31:45,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-13 17:31:45,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-13 17:31:45,975 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:45,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:45,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1685978356, now seen corresponding path program 1 times [2021-11-13 17:31:45,976 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:45,976 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224156746] [2021-11-13 17:31:45,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:45,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:45,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:46,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:46,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:46,168 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:46,168 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:46,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224156746] [2021-11-13 17:31:46,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224156746] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:46,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974141980] [2021-11-13 17:31:46,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:46,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:46,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:46,169 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:46,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-13 17:31:46,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:46,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 17:31:46,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:46,618 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:46,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:46,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-13 17:31:46,958 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:31:46,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974141980] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:46,958 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:46,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 25 [2021-11-13 17:31:46,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556291522] [2021-11-13 17:31:46,959 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:46,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-13 17:31:46,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:46,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-13 17:31:46,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-11-13 17:31:46,961 INFO L87 Difference]: Start difference. First operand 177 states and 200 transitions. Second operand has 26 states, 25 states have (on average 4.32) internal successors, (108), 22 states have internal predecessors, (108), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:47,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:47,694 INFO L93 Difference]: Finished difference Result 201 states and 220 transitions. [2021-11-13 17:31:47,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-13 17:31:47,694 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 4.32) internal successors, (108), 22 states have internal predecessors, (108), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-11-13 17:31:47,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:47,695 INFO L225 Difference]: With dead ends: 201 [2021-11-13 17:31:47,695 INFO L226 Difference]: Without dead ends: 201 [2021-11-13 17:31:47,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=243, Invalid=1317, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 17:31:47,697 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 350 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 687 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 324.49ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 756 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.33ms SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 687 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 386.38ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:47,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 160 Invalid, 756 Unknown, 0 Unchecked, 3.33ms Time], IncrementalHoareTripleChecker [69 Valid, 687 Invalid, 0 Unknown, 0 Unchecked, 386.38ms Time] [2021-11-13 17:31:47,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-13 17:31:47,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 181. [2021-11-13 17:31:47,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 172 states have (on average 1.1453488372093024) internal successors, (197), 174 states have internal predecessors, (197), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:47,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 203 transitions. [2021-11-13 17:31:47,703 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 203 transitions. Word has length 53 [2021-11-13 17:31:47,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:47,704 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 203 transitions. [2021-11-13 17:31:47,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 4.32) internal successors, (108), 22 states have internal predecessors, (108), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:47,704 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 203 transitions. [2021-11-13 17:31:47,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-13 17:31:47,705 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:47,705 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2021-11-13 17:31:47,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:47,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-13 17:31:47,911 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:47,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:47,912 INFO L85 PathProgramCache]: Analyzing trace with hash -1633605210, now seen corresponding path program 1 times [2021-11-13 17:31:47,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:47,912 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514104914] [2021-11-13 17:31:47,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:47,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:47,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:48,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:48,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:48,212 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 17:31:48,212 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:48,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514104914] [2021-11-13 17:31:48,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514104914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:48,212 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948140649] [2021-11-13 17:31:48,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:48,212 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:48,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:48,213 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:48,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-13 17:31:48,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:48,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-13 17:31:48,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:48,399 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 25 treesize of output 21 [2021-11-13 17:31:49,317 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:31:49,317 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 33 treesize of output 33 [2021-11-13 17:31:49,523 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 17:31:49,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:50,434 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 36 treesize of output 34 [2021-11-13 17:31:50,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2021-11-13 17:31:50,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2021-11-13 17:31:50,535 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 17:31:50,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948140649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:50,536 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:50,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 37 [2021-11-13 17:31:50,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373418769] [2021-11-13 17:31:50,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:50,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-13 17:31:50,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:50,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-13 17:31:50,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1210, Unknown=0, NotChecked=0, Total=1332 [2021-11-13 17:31:50,548 INFO L87 Difference]: Start difference. First operand 181 states and 203 transitions. Second operand has 37 states, 34 states have (on average 3.5) internal successors, (119), 33 states have internal predecessors, (119), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:51,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:31:51,630 INFO L93 Difference]: Finished difference Result 298 states and 329 transitions. [2021-11-13 17:31:51,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 17:31:51,631 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 3.5) internal successors, (119), 33 states have internal predecessors, (119), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-11-13 17:31:51,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:31:51,633 INFO L225 Difference]: With dead ends: 298 [2021-11-13 17:31:51,633 INFO L226 Difference]: Without dead ends: 291 [2021-11-13 17:31:51,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 96 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=272, Invalid=2590, Unknown=0, NotChecked=0, Total=2862 [2021-11-13 17:31:51,635 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 160 mSDsluCounter, 286 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 274.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 1014 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.11ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 387 IncrementalHoareTripleChecker+Unchecked, 349.86ms IncrementalHoareTripleChecker+Time [2021-11-13 17:31:51,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 319 Invalid, 1014 Unknown, 0 Unchecked, 3.11ms Time], IncrementalHoareTripleChecker [13 Valid, 614 Invalid, 0 Unknown, 387 Unchecked, 349.86ms Time] [2021-11-13 17:31:51,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-13 17:31:51,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 243. [2021-11-13 17:31:51,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 234 states have (on average 1.123931623931624) internal successors, (263), 236 states have internal predecessors, (263), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:51,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 269 transitions. [2021-11-13 17:31:51,645 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 269 transitions. Word has length 56 [2021-11-13 17:31:51,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:31:51,646 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 269 transitions. [2021-11-13 17:31:51,646 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 3.5) internal successors, (119), 33 states have internal predecessors, (119), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:31:51,646 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 269 transitions. [2021-11-13 17:31:51,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-13 17:31:51,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:31:51,647 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-13 17:31:51,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-13 17:31:51,863 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:51,863 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:31:51,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:31:51,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1613499495, now seen corresponding path program 4 times [2021-11-13 17:31:51,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:31:51,864 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [606928690] [2021-11-13 17:31:51,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:31:51,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:31:51,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:52,068 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:31:52,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:31:52,073 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:31:52,073 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:31:52,073 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [606928690] [2021-11-13 17:31:52,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [606928690] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:31:52,074 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928273968] [2021-11-13 17:31:52,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:31:52,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:31:52,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:31:52,080 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:31:52,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-13 17:31:52,187 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:31:52,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:31:52,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-13 17:31:52,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:31:52,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:31:52,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 17:31:52,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:31:52,488 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-13 17:31:52,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-13 17:31:53,181 INFO L354 Elim1Store]: treesize reduction 43, result has 55.2 percent of original size [2021-11-13 17:31:53,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 73 [2021-11-13 17:31:53,424 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-13 17:31:53,424 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:31:58,033 INFO L354 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2021-11-13 17:31:58,034 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 385 treesize of output 349 [2021-11-13 17:31:58,664 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-13 17:31:58,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928273968] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:31:58,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:31:58,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16] total 40 [2021-11-13 17:31:58,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162975292] [2021-11-13 17:31:58,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:31:58,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-13 17:31:58,667 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:31:58,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-13 17:31:58,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1486, Unknown=1, NotChecked=0, Total=1640 [2021-11-13 17:31:58,668 INFO L87 Difference]: Start difference. First operand 243 states and 269 transitions. Second operand has 41 states, 38 states have (on average 2.973684210526316) internal successors, (113), 37 states have internal predecessors, (113), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:00,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:00,049 INFO L93 Difference]: Finished difference Result 246 states and 270 transitions. [2021-11-13 17:32:00,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 17:32:00,050 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 2.973684210526316) internal successors, (113), 37 states have internal predecessors, (113), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-11-13 17:32:00,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:00,052 INFO L225 Difference]: With dead ends: 246 [2021-11-13 17:32:00,052 INFO L226 Difference]: Without dead ends: 246 [2021-11-13 17:32:00,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 88 SyntacticMatches, 6 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=436, Invalid=3469, Unknown=1, NotChecked=0, Total=3906 [2021-11-13 17:32:00,054 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 64 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 558 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 269.47ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 905 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.90ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 334 IncrementalHoareTripleChecker+Unchecked, 321.45ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:00,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 327 Invalid, 905 Unknown, 0 Unchecked, 2.90ms Time], IncrementalHoareTripleChecker [13 Valid, 558 Invalid, 0 Unknown, 334 Unchecked, 321.45ms Time] [2021-11-13 17:32:00,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-13 17:32:00,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 243. [2021-11-13 17:32:00,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 234 states have (on average 1.1196581196581197) internal successors, (262), 236 states have internal predecessors, (262), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:00,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 268 transitions. [2021-11-13 17:32:00,063 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 268 transitions. Word has length 57 [2021-11-13 17:32:00,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:00,063 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 268 transitions. [2021-11-13 17:32:00,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 38 states have (on average 2.973684210526316) internal successors, (113), 37 states have internal predecessors, (113), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:00,064 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 268 transitions. [2021-11-13 17:32:00,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-13 17:32:00,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:00,065 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:00,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:00,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:00,284 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:00,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:00,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1510482325, now seen corresponding path program 3 times [2021-11-13 17:32:00,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:00,285 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104003473] [2021-11-13 17:32:00,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:00,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:00,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:00,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:00,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:00,505 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:32:00,505 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:00,507 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104003473] [2021-11-13 17:32:00,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104003473] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:00,508 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044408387] [2021-11-13 17:32:00,508 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:32:00,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:00,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:00,510 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:00,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-13 17:32:00,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-13 17:32:00,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:00,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-13 17:32:00,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:01,103 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 33 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:32:01,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:01,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-13 17:32:01,521 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 33 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:32:01,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044408387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:01,521 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:01,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 34 [2021-11-13 17:32:01,522 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879578717] [2021-11-13 17:32:01,522 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:01,522 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-13 17:32:01,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:01,523 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-13 17:32:01,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 17:32:01,524 INFO L87 Difference]: Start difference. First operand 243 states and 268 transitions. Second operand has 35 states, 31 states have (on average 4.064516129032258) internal successors, (126), 31 states have internal predecessors, (126), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:02,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:02,343 INFO L93 Difference]: Finished difference Result 390 states and 432 transitions. [2021-11-13 17:32:02,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-13 17:32:02,344 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 31 states have (on average 4.064516129032258) internal successors, (126), 31 states have internal predecessors, (126), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-11-13 17:32:02,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:02,347 INFO L225 Difference]: With dead ends: 390 [2021-11-13 17:32:02,348 INFO L226 Difference]: Without dead ends: 390 [2021-11-13 17:32:02,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=265, Invalid=1627, Unknown=0, NotChecked=0, Total=1892 [2021-11-13 17:32:02,349 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 415 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 1183 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 474.19ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 1221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.09ms SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 597.64ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:02,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [415 Valid, 211 Invalid, 1221 Unknown, 0 Unchecked, 4.09ms Time], IncrementalHoareTripleChecker [38 Valid, 1183 Invalid, 0 Unknown, 0 Unchecked, 597.64ms Time] [2021-11-13 17:32:02,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-11-13 17:32:02,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 281. [2021-11-13 17:32:02,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 272 states have (on average 1.1470588235294117) internal successors, (312), 274 states have internal predecessors, (312), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:02,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 318 transitions. [2021-11-13 17:32:02,361 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 318 transitions. Word has length 60 [2021-11-13 17:32:02,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:02,361 INFO L470 AbstractCegarLoop]: Abstraction has 281 states and 318 transitions. [2021-11-13 17:32:02,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 31 states have (on average 4.064516129032258) internal successors, (126), 31 states have internal predecessors, (126), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:02,362 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 318 transitions. [2021-11-13 17:32:02,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-13 17:32:02,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:02,363 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:02,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:02,591 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:02,591 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:02,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:02,592 INFO L85 PathProgramCache]: Analyzing trace with hash -1057888223, now seen corresponding path program 4 times [2021-11-13 17:32:02,592 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:02,592 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871828773] [2021-11-13 17:32:02,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:02,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:02,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:03,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:03,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 21 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:32:03,261 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:03,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871828773] [2021-11-13 17:32:03,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871828773] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:03,261 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810866674] [2021-11-13 17:32:03,262 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:32:03,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:03,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:03,266 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:03,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-13 17:32:03,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:32:03,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:03,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-13 17:32:03,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:03,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:32:03,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 17:32:03,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:32:03,802 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-13 17:32:03,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-13 17:32:04,595 INFO L354 Elim1Store]: treesize reduction 39, result has 23.5 percent of original size [2021-11-13 17:32:04,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 26 [2021-11-13 17:32:04,759 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:04,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:07,766 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 56 treesize of output 52 [2021-11-13 17:32:08,221 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 21 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:08,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810866674] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:08,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:08,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 15, 15] total 45 [2021-11-13 17:32:08,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261080745] [2021-11-13 17:32:08,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:08,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 17:32:08,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:08,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 17:32:08,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1831, Unknown=1, NotChecked=0, Total=1980 [2021-11-13 17:32:08,224 INFO L87 Difference]: Start difference. First operand 281 states and 318 transitions. Second operand has 45 states, 42 states have (on average 3.6904761904761907) internal successors, (155), 41 states have internal predecessors, (155), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:09,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:09,859 INFO L93 Difference]: Finished difference Result 486 states and 541 transitions. [2021-11-13 17:32:09,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-13 17:32:09,859 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 3.6904761904761907) internal successors, (155), 41 states have internal predecessors, (155), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-11-13 17:32:09,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:09,862 INFO L225 Difference]: With dead ends: 486 [2021-11-13 17:32:09,862 INFO L226 Difference]: Without dead ends: 413 [2021-11-13 17:32:09,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=438, Invalid=3983, Unknown=1, NotChecked=0, Total=4422 [2021-11-13 17:32:09,865 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 128 mSDsluCounter, 516 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 215.94ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.48ms SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 246 IncrementalHoareTripleChecker+Unchecked, 253.73ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:09,866 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 541 Invalid, 689 Unknown, 0 Unchecked, 2.48ms Time], IncrementalHoareTripleChecker [42 Valid, 401 Invalid, 0 Unknown, 246 Unchecked, 253.73ms Time] [2021-11-13 17:32:09,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-11-13 17:32:09,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 403. [2021-11-13 17:32:09,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 392 states have (on average 1.1301020408163265) internal successors, (443), 394 states have internal predecessors, (443), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:09,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 451 transitions. [2021-11-13 17:32:09,879 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 451 transitions. Word has length 62 [2021-11-13 17:32:09,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:09,880 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 451 transitions. [2021-11-13 17:32:09,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 42 states have (on average 3.6904761904761907) internal successors, (155), 41 states have internal predecessors, (155), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:09,880 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 451 transitions. [2021-11-13 17:32:09,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-13 17:32:09,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:09,882 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:09,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:10,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-13 17:32:10,099 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:10,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:10,100 INFO L85 PathProgramCache]: Analyzing trace with hash -1344162434, now seen corresponding path program 5 times [2021-11-13 17:32:10,100 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:10,100 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89570303] [2021-11-13 17:32:10,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:10,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:10,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:10,315 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:10,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:10,320 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 1 proven. 50 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:10,320 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:10,320 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89570303] [2021-11-13 17:32:10,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89570303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:10,321 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205318812] [2021-11-13 17:32:10,321 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:32:10,321 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:10,321 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:10,324 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:10,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-13 17:32:10,482 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-13 17:32:10,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:10,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 17:32:10,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:10,523 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:32:10,523 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:32:10,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:32:11,080 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:11,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:11,769 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 15 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:11,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205318812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:11,769 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:11,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 10] total 27 [2021-11-13 17:32:11,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595572962] [2021-11-13 17:32:11,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:11,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-13 17:32:11,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:11,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-13 17:32:11,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=660, Unknown=0, NotChecked=0, Total=756 [2021-11-13 17:32:11,772 INFO L87 Difference]: Start difference. First operand 403 states and 451 transitions. Second operand has 28 states, 27 states have (on average 6.111111111111111) internal successors, (165), 25 states have internal predecessors, (165), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:12,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:12,564 INFO L93 Difference]: Finished difference Result 570 states and 637 transitions. [2021-11-13 17:32:12,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 17:32:12,564 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 6.111111111111111) internal successors, (165), 25 states have internal predecessors, (165), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-11-13 17:32:12,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:12,567 INFO L225 Difference]: With dead ends: 570 [2021-11-13 17:32:12,568 INFO L226 Difference]: Without dead ends: 570 [2021-11-13 17:32:12,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=180, Invalid=1152, Unknown=0, NotChecked=0, Total=1332 [2021-11-13 17:32:12,569 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 247 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 1314 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 488.27ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 1335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.03ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 600.39ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:12,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [247 Valid, 267 Invalid, 1335 Unknown, 0 Unchecked, 4.03ms Time], IncrementalHoareTripleChecker [21 Valid, 1314 Invalid, 0 Unknown, 0 Unchecked, 600.39ms Time] [2021-11-13 17:32:12,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-11-13 17:32:12,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 484. [2021-11-13 17:32:12,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 473 states have (on average 1.1374207188160677) internal successors, (538), 475 states have internal predecessors, (538), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:12,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 546 transitions. [2021-11-13 17:32:12,583 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 546 transitions. Word has length 66 [2021-11-13 17:32:12,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:12,584 INFO L470 AbstractCegarLoop]: Abstraction has 484 states and 546 transitions. [2021-11-13 17:32:12,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 6.111111111111111) internal successors, (165), 25 states have internal predecessors, (165), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:12,584 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 546 transitions. [2021-11-13 17:32:12,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-13 17:32:12,585 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:12,586 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 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] [2021-11-13 17:32:12,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:12,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-13 17:32:12,811 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:12,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:12,812 INFO L85 PathProgramCache]: Analyzing trace with hash -849406957, now seen corresponding path program 2 times [2021-11-13 17:32:12,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:12,812 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438995545] [2021-11-13 17:32:12,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:12,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:12,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:13,045 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:13,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:13,049 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:13,050 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:13,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438995545] [2021-11-13 17:32:13,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438995545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:13,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994452132] [2021-11-13 17:32:13,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:32:13,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:13,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:13,051 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:13,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-13 17:32:13,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:32:13,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:13,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-13 17:32:13,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:13,545 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 1 proven. 44 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:13,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:13,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-13 17:32:14,034 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 1 proven. 44 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:14,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994452132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:14,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:14,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 27 [2021-11-13 17:32:14,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174671012] [2021-11-13 17:32:14,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:14,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-13 17:32:14,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:14,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-13 17:32:14,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=666, Unknown=0, NotChecked=0, Total=756 [2021-11-13 17:32:14,036 INFO L87 Difference]: Start difference. First operand 484 states and 546 transitions. Second operand has 28 states, 24 states have (on average 5.083333333333333) internal successors, (122), 24 states have internal predecessors, (122), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:14,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:14,650 INFO L93 Difference]: Finished difference Result 624 states and 698 transitions. [2021-11-13 17:32:14,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-13 17:32:14,650 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 24 states have (on average 5.083333333333333) internal successors, (122), 24 states have internal predecessors, (122), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-11-13 17:32:14,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:14,654 INFO L225 Difference]: With dead ends: 624 [2021-11-13 17:32:14,655 INFO L226 Difference]: Without dead ends: 624 [2021-11-13 17:32:14,656 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=1075, Unknown=0, NotChecked=0, Total=1260 [2021-11-13 17:32:14,656 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 204 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 824 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 340.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 845 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.13ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 824 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 425.66ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:14,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 179 Invalid, 845 Unknown, 0 Unchecked, 3.13ms Time], IncrementalHoareTripleChecker [21 Valid, 824 Invalid, 0 Unknown, 0 Unchecked, 425.66ms Time] [2021-11-13 17:32:14,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-11-13 17:32:14,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 501. [2021-11-13 17:32:14,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 490 states have (on average 1.1428571428571428) internal successors, (560), 492 states have internal predecessors, (560), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:14,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 568 transitions. [2021-11-13 17:32:14,675 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 568 transitions. Word has length 67 [2021-11-13 17:32:14,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:14,676 INFO L470 AbstractCegarLoop]: Abstraction has 501 states and 568 transitions. [2021-11-13 17:32:14,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 24 states have (on average 5.083333333333333) internal successors, (122), 24 states have internal predecessors, (122), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:14,676 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 568 transitions. [2021-11-13 17:32:14,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-13 17:32:14,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:14,678 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:14,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:14,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-13 17:32:14,903 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:14,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:14,904 INFO L85 PathProgramCache]: Analyzing trace with hash -322835807, now seen corresponding path program 4 times [2021-11-13 17:32:14,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:14,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419881492] [2021-11-13 17:32:14,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:14,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:14,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:15,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:15,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:15,142 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 27 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:15,142 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:15,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419881492] [2021-11-13 17:32:15,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419881492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:15,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316725449] [2021-11-13 17:32:15,143 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:32:15,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:15,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:15,144 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:15,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-13 17:32:15,275 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:32:15,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:15,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-13 17:32:15,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:15,310 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:32:15,311 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:32:15,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:32:15,674 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 46 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:15,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 31 proven. 21 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:16,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [316725449] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:16,019 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:16,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 29 [2021-11-13 17:32:16,019 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478075426] [2021-11-13 17:32:16,020 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:16,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-13 17:32:16,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:16,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-13 17:32:16,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=687, Unknown=0, NotChecked=0, Total=812 [2021-11-13 17:32:16,021 INFO L87 Difference]: Start difference. First operand 501 states and 568 transitions. Second operand has 29 states, 29 states have (on average 4.0) internal successors, (116), 26 states have internal predecessors, (116), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:16,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:16,830 INFO L93 Difference]: Finished difference Result 519 states and 580 transitions. [2021-11-13 17:32:16,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-13 17:32:16,836 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 4.0) internal successors, (116), 26 states have internal predecessors, (116), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-11-13 17:32:16,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:16,840 INFO L225 Difference]: With dead ends: 519 [2021-11-13 17:32:16,840 INFO L226 Difference]: Without dead ends: 514 [2021-11-13 17:32:16,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=331, Invalid=1475, Unknown=0, NotChecked=0, Total=1806 [2021-11-13 17:32:16,844 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 179 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 367.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 788 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.15ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 448.92ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:16,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 167 Invalid, 788 Unknown, 0 Unchecked, 3.15ms Time], IncrementalHoareTripleChecker [41 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 448.92ms Time] [2021-11-13 17:32:16,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2021-11-13 17:32:16,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 500. [2021-11-13 17:32:16,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 489 states have (on average 1.1370143149284253) internal successors, (556), 491 states have internal predecessors, (556), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:16,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 564 transitions. [2021-11-13 17:32:16,862 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 564 transitions. Word has length 67 [2021-11-13 17:32:16,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:16,862 INFO L470 AbstractCegarLoop]: Abstraction has 500 states and 564 transitions. [2021-11-13 17:32:16,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 4.0) internal successors, (116), 26 states have internal predecessors, (116), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:16,863 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 564 transitions. [2021-11-13 17:32:16,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-13 17:32:16,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:16,864 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:16,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:17,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-13 17:32:17,081 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:17,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:17,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1392149990, now seen corresponding path program 2 times [2021-11-13 17:32:17,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:17,082 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834112317] [2021-11-13 17:32:17,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:17,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:17,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:17,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:17,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:17,720 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 15 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:32:17,721 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:17,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834112317] [2021-11-13 17:32:17,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834112317] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:17,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024308167] [2021-11-13 17:32:17,721 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:32:17,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:17,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:17,722 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:17,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-13 17:32:17,848 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:32:17,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:17,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-13 17:32:17,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:17,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:32:18,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:32:18,213 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:32:18,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:32:21,486 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-13 17:32:21,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 52 [2021-11-13 17:32:21,537 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 15 proven. 29 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:21,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:30,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:32:30,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:32:30,968 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 15 proven. 29 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:30,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024308167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:30,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:30,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20, 19] total 49 [2021-11-13 17:32:30,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364214614] [2021-11-13 17:32:30,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:30,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-13 17:32:30,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:30,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-13 17:32:30,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=2182, Unknown=0, NotChecked=0, Total=2352 [2021-11-13 17:32:30,971 INFO L87 Difference]: Start difference. First operand 500 states and 564 transitions. Second operand has 49 states, 48 states have (on average 2.9583333333333335) internal successors, (142), 45 states have internal predecessors, (142), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:31,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:31,967 INFO L93 Difference]: Finished difference Result 486 states and 545 transitions. [2021-11-13 17:32:31,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-13 17:32:31,968 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.9583333333333335) internal successors, (142), 45 states have internal predecessors, (142), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-11-13 17:32:31,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:31,971 INFO L225 Difference]: With dead ends: 486 [2021-11-13 17:32:31,972 INFO L226 Difference]: Without dead ends: 386 [2021-11-13 17:32:31,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 110 SyntacticMatches, 4 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=321, Invalid=3711, Unknown=0, NotChecked=0, Total=4032 [2021-11-13 17:32:31,973 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 81 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 536 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 242.03ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 493 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.64ms SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 536 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 193 IncrementalHoareTripleChecker+Unchecked, 288.97ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:31,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 493 Invalid, 754 Unknown, 0 Unchecked, 2.64ms Time], IncrementalHoareTripleChecker [25 Valid, 536 Invalid, 0 Unknown, 193 Unchecked, 288.97ms Time] [2021-11-13 17:32:31,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-11-13 17:32:31,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 383. [2021-11-13 17:32:31,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 374 states have (on average 1.1577540106951871) internal successors, (433), 376 states have internal predecessors, (433), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:31,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 439 transitions. [2021-11-13 17:32:31,988 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 439 transitions. Word has length 68 [2021-11-13 17:32:31,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:31,988 INFO L470 AbstractCegarLoop]: Abstraction has 383 states and 439 transitions. [2021-11-13 17:32:31,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.9583333333333335) internal successors, (142), 45 states have internal predecessors, (142), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:31,989 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 439 transitions. [2021-11-13 17:32:31,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-13 17:32:31,990 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:31,990 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:32,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:32,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:32,207 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:32,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:32,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1801252708, now seen corresponding path program 5 times [2021-11-13 17:32:32,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:32,208 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100704741] [2021-11-13 17:32:32,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:32,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:32,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:33,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:33,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:33,434 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:32:33,434 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:33,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100704741] [2021-11-13 17:32:33,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100704741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:33,434 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114733079] [2021-11-13 17:32:33,434 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:32:33,434 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:33,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:33,436 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:33,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-13 17:32:33,593 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-13 17:32:33,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:33,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 17:32:33,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:33,898 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 21 treesize of output 17 [2021-11-13 17:32:34,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-13 17:32:34,294 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:34,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:34,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:32:34,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:32:34,737 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:34,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114733079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:34,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:34,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 17, 17] total 41 [2021-11-13 17:32:34,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305134883] [2021-11-13 17:32:34,738 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:34,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-13 17:32:34,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:34,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-13 17:32:34,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1517, Unknown=0, NotChecked=0, Total=1640 [2021-11-13 17:32:34,739 INFO L87 Difference]: Start difference. First operand 383 states and 439 transitions. Second operand has 41 states, 38 states have (on average 3.0526315789473686) internal successors, (116), 37 states have internal predecessors, (116), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:37,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:37,999 INFO L93 Difference]: Finished difference Result 732 states and 816 transitions. [2021-11-13 17:32:38,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-13 17:32:38,003 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 3.0526315789473686) internal successors, (116), 37 states have internal predecessors, (116), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-11-13 17:32:38,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:38,007 INFO L225 Difference]: With dead ends: 732 [2021-11-13 17:32:38,008 INFO L226 Difference]: Without dead ends: 708 [2021-11-13 17:32:38,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 126 SyntacticMatches, 4 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 4 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=445, Invalid=4957, Unknown=0, NotChecked=0, Total=5402 [2021-11-13 17:32:38,009 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 327 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 2476 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1142.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 397 SdHoareTripleChecker+Invalid, 2667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.07ms SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 2476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 1377.18ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:38,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [327 Valid, 397 Invalid, 2667 Unknown, 0 Unchecked, 8.07ms Time], IncrementalHoareTripleChecker [46 Valid, 2476 Invalid, 0 Unknown, 145 Unchecked, 1377.18ms Time] [2021-11-13 17:32:38,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2021-11-13 17:32:38,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 615. [2021-11-13 17:32:38,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 615 states, 604 states have (on average 1.1523178807947019) internal successors, (696), 606 states have internal predecessors, (696), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:38,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 615 states to 615 states and 704 transitions. [2021-11-13 17:32:38,033 INFO L78 Accepts]: Start accepts. Automaton has 615 states and 704 transitions. Word has length 71 [2021-11-13 17:32:38,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:38,034 INFO L470 AbstractCegarLoop]: Abstraction has 615 states and 704 transitions. [2021-11-13 17:32:38,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 38 states have (on average 3.0526315789473686) internal successors, (116), 37 states have internal predecessors, (116), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:38,034 INFO L276 IsEmpty]: Start isEmpty. Operand 615 states and 704 transitions. [2021-11-13 17:32:38,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-13 17:32:38,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:38,036 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:38,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:38,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-13 17:32:38,251 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:38,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:38,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1648662191, now seen corresponding path program 3 times [2021-11-13 17:32:38,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:38,252 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642787166] [2021-11-13 17:32:38,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:38,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:38,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:38,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:38,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:38,515 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 1 proven. 58 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:32:38,515 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:38,515 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642787166] [2021-11-13 17:32:38,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642787166] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:38,515 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129686090] [2021-11-13 17:32:38,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:32:38,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:38,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:38,522 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:38,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-13 17:32:38,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-13 17:32:38,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:38,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-13 17:32:38,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:38,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:32:38,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 17:32:38,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-13 17:32:39,015 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-13 17:32:39,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-13 17:32:39,834 INFO L354 Elim1Store]: treesize reduction 39, result has 26.4 percent of original size [2021-11-13 17:32:39,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 42 treesize of output 34 [2021-11-13 17:32:39,993 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:32:39,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:40,615 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [substring_~ps~0.offset] [2021-11-13 17:32:40,615 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-13 17:32:40,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-11-13 17:32:40,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105846248] [2021-11-13 17:32:40,615 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:40,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-13 17:32:40,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:40,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-13 17:32:40,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=954, Unknown=0, NotChecked=0, Total=1056 [2021-11-13 17:32:40,617 INFO L87 Difference]: Start difference. First operand 615 states and 704 transitions. Second operand has 14 states, 13 states have (on average 4.923076923076923) internal successors, (64), 12 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:41,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:41,239 INFO L93 Difference]: Finished difference Result 647 states and 726 transitions. [2021-11-13 17:32:41,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-13 17:32:41,240 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.923076923076923) internal successors, (64), 12 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-11-13 17:32:41,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:41,244 INFO L225 Difference]: With dead ends: 647 [2021-11-13 17:32:41,244 INFO L226 Difference]: Without dead ends: 647 [2021-11-13 17:32:41,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=196, Invalid=1610, Unknown=0, NotChecked=0, Total=1806 [2021-11-13 17:32:41,245 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 166 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 755 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 292.28ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.34ms SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 755 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 351.05ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:41,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 156 Invalid, 770 Unknown, 0 Unchecked, 2.34ms Time], IncrementalHoareTripleChecker [15 Valid, 755 Invalid, 0 Unknown, 0 Unchecked, 351.05ms Time] [2021-11-13 17:32:41,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-11-13 17:32:41,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 615. [2021-11-13 17:32:41,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 615 states, 604 states have (on average 1.1440397350993377) internal successors, (691), 606 states have internal predecessors, (691), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:41,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 615 states to 615 states and 699 transitions. [2021-11-13 17:32:41,265 INFO L78 Accepts]: Start accepts. Automaton has 615 states and 699 transitions. Word has length 72 [2021-11-13 17:32:41,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:41,266 INFO L470 AbstractCegarLoop]: Abstraction has 615 states and 699 transitions. [2021-11-13 17:32:41,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.923076923076923) internal successors, (64), 12 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:41,266 INFO L276 IsEmpty]: Start isEmpty. Operand 615 states and 699 transitions. [2021-11-13 17:32:41,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-13 17:32:41,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:41,269 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:41,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:41,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:41,483 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:41,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:41,484 INFO L85 PathProgramCache]: Analyzing trace with hash -1480582781, now seen corresponding path program 4 times [2021-11-13 17:32:41,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:41,484 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470210936] [2021-11-13 17:32:41,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:41,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:41,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:41,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:41,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:41,721 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 1 proven. 52 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:41,721 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:41,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470210936] [2021-11-13 17:32:41,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470210936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:41,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956172866] [2021-11-13 17:32:41,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:32:41,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:41,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:41,727 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:41,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-13 17:32:41,866 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:32:41,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:41,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-13 17:32:41,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:41,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:32:41,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 17:32:42,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-13 17:32:42,569 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-13 17:32:42,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-13 17:32:43,806 INFO L354 Elim1Store]: treesize reduction 43, result has 55.2 percent of original size [2021-11-13 17:32:43,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 50 treesize of output 73 [2021-11-13 17:32:44,064 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 45 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:44,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:47,568 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-13 17:32:47,568 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 425 treesize of output 381 [2021-11-13 17:32:48,545 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 15 proven. 38 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:48,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956172866] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:48,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:48,546 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 20] total 51 [2021-11-13 17:32:48,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482619475] [2021-11-13 17:32:48,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:48,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-13 17:32:48,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:48,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-13 17:32:48,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2443, Unknown=1, NotChecked=0, Total=2652 [2021-11-13 17:32:48,548 INFO L87 Difference]: Start difference. First operand 615 states and 699 transitions. Second operand has 52 states, 49 states have (on average 3.489795918367347) internal successors, (171), 48 states have internal predecessors, (171), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:50,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:50,707 INFO L93 Difference]: Finished difference Result 726 states and 817 transitions. [2021-11-13 17:32:50,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-13 17:32:50,708 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 49 states have (on average 3.489795918367347) internal successors, (171), 48 states have internal predecessors, (171), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-11-13 17:32:50,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:50,712 INFO L225 Difference]: With dead ends: 726 [2021-11-13 17:32:50,712 INFO L226 Difference]: Without dead ends: 726 [2021-11-13 17:32:50,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1037 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=551, Invalid=5768, Unknown=1, NotChecked=0, Total=6320 [2021-11-13 17:32:50,714 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 121 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 229.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.43ms SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 368 IncrementalHoareTripleChecker+Unchecked, 275.39ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:50,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 424 Invalid, 896 Unknown, 0 Unchecked, 2.43ms Time], IncrementalHoareTripleChecker [17 Valid, 511 Invalid, 0 Unknown, 368 Unchecked, 275.39ms Time] [2021-11-13 17:32:50,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 726 states. [2021-11-13 17:32:50,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 726 to 714. [2021-11-13 17:32:50,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 714 states, 703 states have (on average 1.1337126600284495) internal successors, (797), 705 states have internal predecessors, (797), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:50,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 714 states to 714 states and 805 transitions. [2021-11-13 17:32:50,734 INFO L78 Accepts]: Start accepts. Automaton has 714 states and 805 transitions. Word has length 72 [2021-11-13 17:32:50,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:50,735 INFO L470 AbstractCegarLoop]: Abstraction has 714 states and 805 transitions. [2021-11-13 17:32:50,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 49 states have (on average 3.489795918367347) internal successors, (171), 48 states have internal predecessors, (171), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:50,736 INFO L276 IsEmpty]: Start isEmpty. Operand 714 states and 805 transitions. [2021-11-13 17:32:50,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-13 17:32:50,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:50,738 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:50,780 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:50,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:50,955 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:50,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:50,956 INFO L85 PathProgramCache]: Analyzing trace with hash 486762716, now seen corresponding path program 5 times [2021-11-13 17:32:50,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:50,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82001351] [2021-11-13 17:32:50,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:50,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:50,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:51,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:51,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:51,186 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 1 proven. 71 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:32:51,187 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:51,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82001351] [2021-11-13 17:32:51,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82001351] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:51,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488049707] [2021-11-13 17:32:51,187 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:32:51,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:51,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:51,192 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:51,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-13 17:32:51,356 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-13 17:32:51,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:51,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 17:32:51,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:51,396 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:32:51,397 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:32:51,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:32:52,063 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 6 proven. 73 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:32:52,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:52,679 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 15 proven. 57 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:32:52,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488049707] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:52,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:52,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 11] total 34 [2021-11-13 17:32:52,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118228995] [2021-11-13 17:32:52,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:52,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-13 17:32:52,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:52,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-13 17:32:52,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1066, Unknown=0, NotChecked=0, Total=1190 [2021-11-13 17:32:52,681 INFO L87 Difference]: Start difference. First operand 714 states and 805 transitions. Second operand has 35 states, 34 states have (on average 5.0588235294117645) internal successors, (172), 31 states have internal predecessors, (172), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:53,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:53,877 INFO L93 Difference]: Finished difference Result 763 states and 850 transitions. [2021-11-13 17:32:53,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-13 17:32:53,877 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 5.0588235294117645) internal successors, (172), 31 states have internal predecessors, (172), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-11-13 17:32:53,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:53,882 INFO L225 Difference]: With dead ends: 763 [2021-11-13 17:32:53,882 INFO L226 Difference]: Without dead ends: 763 [2021-11-13 17:32:53,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=383, Invalid=2479, Unknown=0, NotChecked=0, Total=2862 [2021-11-13 17:32:53,883 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 296 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 1060 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 480.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 1129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.88ms SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 1060 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 573.17ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:53,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 211 Invalid, 1129 Unknown, 0 Unchecked, 3.88ms Time], IncrementalHoareTripleChecker [69 Valid, 1060 Invalid, 0 Unknown, 0 Unchecked, 573.17ms Time] [2021-11-13 17:32:53,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 763 states. [2021-11-13 17:32:53,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 763 to 706. [2021-11-13 17:32:53,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 706 states, 695 states have (on average 1.1309352517985611) internal successors, (786), 697 states have internal predecessors, (786), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:53,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 706 states to 706 states and 794 transitions. [2021-11-13 17:32:53,906 INFO L78 Accepts]: Start accepts. Automaton has 706 states and 794 transitions. Word has length 75 [2021-11-13 17:32:53,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:53,907 INFO L470 AbstractCegarLoop]: Abstraction has 706 states and 794 transitions. [2021-11-13 17:32:53,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 5.0588235294117645) internal successors, (172), 31 states have internal predecessors, (172), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:53,907 INFO L276 IsEmpty]: Start isEmpty. Operand 706 states and 794 transitions. [2021-11-13 17:32:53,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-13 17:32:53,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:53,909 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:53,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:54,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:54,123 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:54,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:54,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1144910361, now seen corresponding path program 6 times [2021-11-13 17:32:54,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:54,124 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431994227] [2021-11-13 17:32:54,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:54,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:54,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:54,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:54,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:54,400 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 6 proven. 68 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:54,400 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:54,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431994227] [2021-11-13 17:32:54,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431994227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:54,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147877211] [2021-11-13 17:32:54,401 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:32:54,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:54,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:54,402 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:54,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-13 17:32:54,596 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-13 17:32:54,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:54,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-13 17:32:54,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:54,635 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:32:54,635 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:32:55,174 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 15 proven. 59 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:55,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:32:55,919 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 28 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:32:55,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147877211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:32:55,920 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:32:55,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 44 [2021-11-13 17:32:55,920 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009122033] [2021-11-13 17:32:55,920 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:32:55,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 17:32:55,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:32:55,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 17:32:55,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2021-11-13 17:32:55,921 INFO L87 Difference]: Start difference. First operand 706 states and 794 transitions. Second operand has 45 states, 43 states have (on average 4.186046511627907) internal successors, (180), 41 states have internal predecessors, (180), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:56,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:32:56,968 INFO L93 Difference]: Finished difference Result 943 states and 1060 transitions. [2021-11-13 17:32:56,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-13 17:32:56,969 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 43 states have (on average 4.186046511627907) internal successors, (180), 41 states have internal predecessors, (180), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-11-13 17:32:56,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:32:56,974 INFO L225 Difference]: With dead ends: 943 [2021-11-13 17:32:56,974 INFO L226 Difference]: Without dead ends: 943 [2021-11-13 17:32:56,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=432, Invalid=2760, Unknown=0, NotChecked=0, Total=3192 [2021-11-13 17:32:56,974 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 503 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 1402 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 536.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 503 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 1446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.28ms SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 1402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 644.66ms IncrementalHoareTripleChecker+Time [2021-11-13 17:32:56,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [503 Valid, 229 Invalid, 1446 Unknown, 0 Unchecked, 4.28ms Time], IncrementalHoareTripleChecker [44 Valid, 1402 Invalid, 0 Unknown, 0 Unchecked, 644.66ms Time] [2021-11-13 17:32:56,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 943 states. [2021-11-13 17:32:56,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 943 to 836. [2021-11-13 17:32:56,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 836 states, 825 states have (on average 1.1454545454545455) internal successors, (945), 827 states have internal predecessors, (945), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:56,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 836 states to 836 states and 953 transitions. [2021-11-13 17:32:56,995 INFO L78 Accepts]: Start accepts. Automaton has 836 states and 953 transitions. Word has length 75 [2021-11-13 17:32:56,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:32:56,996 INFO L470 AbstractCegarLoop]: Abstraction has 836 states and 953 transitions. [2021-11-13 17:32:56,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 43 states have (on average 4.186046511627907) internal successors, (180), 41 states have internal predecessors, (180), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:32:56,996 INFO L276 IsEmpty]: Start isEmpty. Operand 836 states and 953 transitions. [2021-11-13 17:32:56,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-13 17:32:56,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:32:56,998 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:32:57,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-13 17:32:57,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-13 17:32:57,211 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:32:57,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:32:57,212 INFO L85 PathProgramCache]: Analyzing trace with hash -1940926663, now seen corresponding path program 6 times [2021-11-13 17:32:57,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:32:57,212 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500771469] [2021-11-13 17:32:57,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:32:57,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:32:57,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:57,532 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:32:57,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:32:57,536 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 31 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:57,536 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:32:57,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500771469] [2021-11-13 17:32:57,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500771469] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:32:57,537 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [920338094] [2021-11-13 17:32:57,537 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:32:57,537 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:32:57,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:32:57,540 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:32:57,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-13 17:32:57,715 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-13 17:32:57,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:32:57,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-13 17:32:57,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:32:57,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:32:58,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:32:58,110 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:32:58,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:32:59,226 INFO L354 Elim1Store]: treesize reduction 77, result has 9.4 percent of original size [2021-11-13 17:32:59,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 48 treesize of output 31 [2021-11-13 17:32:59,247 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 44 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:32:59,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:02,727 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 31 treesize of output 27 [2021-11-13 17:33:02,739 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-13 17:33:02,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 43 [2021-11-13 17:33:03,104 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 42 proven. 43 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:33:03,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [920338094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:03,105 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:03,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 17] total 43 [2021-11-13 17:33:03,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497876706] [2021-11-13 17:33:03,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:03,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-13 17:33:03,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:03,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-13 17:33:03,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1655, Unknown=0, NotChecked=0, Total=1806 [2021-11-13 17:33:03,106 INFO L87 Difference]: Start difference. First operand 836 states and 953 transitions. Second operand has 43 states, 42 states have (on average 4.238095238095238) internal successors, (178), 39 states have internal predecessors, (178), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:03,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:03,905 INFO L93 Difference]: Finished difference Result 1162 states and 1306 transitions. [2021-11-13 17:33:03,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 17:33:03,905 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 4.238095238095238) internal successors, (178), 39 states have internal predecessors, (178), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-11-13 17:33:03,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:03,909 INFO L225 Difference]: With dead ends: 1162 [2021-11-13 17:33:03,909 INFO L226 Difference]: Without dead ends: 1064 [2021-11-13 17:33:03,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 128 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=269, Invalid=2811, Unknown=0, NotChecked=0, Total=3080 [2021-11-13 17:33:03,910 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 105 mSDsluCounter, 710 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 248.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 757 SdHoareTripleChecker+Invalid, 878 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.48ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 195 IncrementalHoareTripleChecker+Unchecked, 293.94ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:03,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 757 Invalid, 878 Unknown, 0 Unchecked, 2.48ms Time], IncrementalHoareTripleChecker [11 Valid, 672 Invalid, 0 Unknown, 195 Unchecked, 293.94ms Time] [2021-11-13 17:33:03,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1064 states. [2021-11-13 17:33:03,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1064 to 1046. [2021-11-13 17:33:03,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1046 states, 1033 states have (on average 1.1316553727008714) internal successors, (1169), 1035 states have internal predecessors, (1169), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:03,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1046 states to 1046 states and 1179 transitions. [2021-11-13 17:33:03,930 INFO L78 Accepts]: Start accepts. Automaton has 1046 states and 1179 transitions. Word has length 77 [2021-11-13 17:33:03,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:03,931 INFO L470 AbstractCegarLoop]: Abstraction has 1046 states and 1179 transitions. [2021-11-13 17:33:03,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 4.238095238095238) internal successors, (178), 39 states have internal predecessors, (178), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:03,931 INFO L276 IsEmpty]: Start isEmpty. Operand 1046 states and 1179 transitions. [2021-11-13 17:33:03,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-13 17:33:03,933 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:03,933 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:03,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:04,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-13 17:33:04,147 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:04,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:04,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1338520022, now seen corresponding path program 3 times [2021-11-13 17:33:04,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:04,148 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179524891] [2021-11-13 17:33:04,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:04,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:04,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:04,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:04,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:04,586 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 21 proven. 68 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-13 17:33:04,586 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:04,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179524891] [2021-11-13 17:33:04,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179524891] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:04,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669750613] [2021-11-13 17:33:04,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:33:04,587 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:04,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:04,590 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:04,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-13 17:33:04,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-13 17:33:04,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:33:04,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-13 17:33:04,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:05,063 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 21 treesize of output 17 [2021-11-13 17:33:05,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-13 17:33:05,350 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 21 proven. 74 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-13 17:33:05,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:05,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:33:05,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:33:05,703 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 21 proven. 53 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-13 17:33:05,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669750613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:05,704 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:05,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 15] total 41 [2021-11-13 17:33:05,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345940316] [2021-11-13 17:33:05,704 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:05,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-13 17:33:05,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:05,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-13 17:33:05,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1494, Unknown=0, NotChecked=0, Total=1640 [2021-11-13 17:33:05,706 INFO L87 Difference]: Start difference. First operand 1046 states and 1179 transitions. Second operand has 41 states, 38 states have (on average 3.9473684210526314) internal successors, (150), 38 states have internal predecessors, (150), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:06,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:06,513 INFO L93 Difference]: Finished difference Result 1041 states and 1155 transitions. [2021-11-13 17:33:06,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 17:33:06,514 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 3.9473684210526314) internal successors, (150), 38 states have internal predecessors, (150), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-11-13 17:33:06,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:06,517 INFO L225 Difference]: With dead ends: 1041 [2021-11-13 17:33:06,517 INFO L226 Difference]: Without dead ends: 948 [2021-11-13 17:33:06,518 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=291, Invalid=2571, Unknown=0, NotChecked=0, Total=2862 [2021-11-13 17:33:06,518 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 172 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 1148 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 383.18ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 1171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.28ms SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 460.28ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:06,519 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 262 Invalid, 1171 Unknown, 0 Unchecked, 3.28ms Time], IncrementalHoareTripleChecker [23 Valid, 1148 Invalid, 0 Unknown, 0 Unchecked, 460.28ms Time] [2021-11-13 17:33:06,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 948 states. [2021-11-13 17:33:06,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 948 to 877. [2021-11-13 17:33:06,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 877 states, 865 states have (on average 1.129479768786127) internal successors, (977), 867 states have internal predecessors, (977), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:06,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 986 transitions. [2021-11-13 17:33:06,536 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 986 transitions. Word has length 78 [2021-11-13 17:33:06,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:06,536 INFO L470 AbstractCegarLoop]: Abstraction has 877 states and 986 transitions. [2021-11-13 17:33:06,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 38 states have (on average 3.9473684210526314) internal successors, (150), 38 states have internal predecessors, (150), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:06,537 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 986 transitions. [2021-11-13 17:33:06,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-13 17:33:06,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:06,539 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:06,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:06,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-13 17:33:06,755 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:06,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:06,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1037435844, now seen corresponding path program 7 times [2021-11-13 17:33:06,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:06,756 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226883684] [2021-11-13 17:33:06,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:06,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:06,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:06,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:06,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 6 proven. 92 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:33:06,956 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:06,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226883684] [2021-11-13 17:33:06,956 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226883684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:06,956 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453732467] [2021-11-13 17:33:06,957 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:33:06,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:06,957 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:06,959 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:06,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-13 17:33:07,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:07,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-13 17:33:07,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:07,436 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 15 proven. 83 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:33:07,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:07,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-13 17:33:07,874 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 15 proven. 83 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:33:07,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453732467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:07,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:07,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 31 [2021-11-13 17:33:07,874 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372235199] [2021-11-13 17:33:07,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:07,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-13 17:33:07,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:07,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-13 17:33:07,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2021-11-13 17:33:07,876 INFO L87 Difference]: Start difference. First operand 877 states and 986 transitions. Second operand has 32 states, 31 states have (on average 5.290322580645161) internal successors, (164), 28 states have internal predecessors, (164), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:08,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:08,563 INFO L93 Difference]: Finished difference Result 1137 states and 1283 transitions. [2021-11-13 17:33:08,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-13 17:33:08,563 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 5.290322580645161) internal successors, (164), 28 states have internal predecessors, (164), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-11-13 17:33:08,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:08,567 INFO L225 Difference]: With dead ends: 1137 [2021-11-13 17:33:08,567 INFO L226 Difference]: Without dead ends: 1137 [2021-11-13 17:33:08,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 144 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=228, Invalid=1494, Unknown=0, NotChecked=0, Total=1722 [2021-11-13 17:33:08,568 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 338 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 409.56ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 1210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.32ms SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 492.82ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:08,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [338 Valid, 274 Invalid, 1210 Unknown, 0 Unchecked, 3.32ms Time], IncrementalHoareTripleChecker [24 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 492.82ms Time] [2021-11-13 17:33:08,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1137 states. [2021-11-13 17:33:08,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1137 to 1004. [2021-11-13 17:33:08,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1004 states, 992 states have (on average 1.1370967741935485) internal successors, (1128), 994 states have internal predecessors, (1128), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:08,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1004 states to 1004 states and 1137 transitions. [2021-11-13 17:33:08,589 INFO L78 Accepts]: Start accepts. Automaton has 1004 states and 1137 transitions. Word has length 81 [2021-11-13 17:33:08,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:08,590 INFO L470 AbstractCegarLoop]: Abstraction has 1004 states and 1137 transitions. [2021-11-13 17:33:08,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 5.290322580645161) internal successors, (164), 28 states have internal predecessors, (164), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:08,590 INFO L276 IsEmpty]: Start isEmpty. Operand 1004 states and 1137 transitions. [2021-11-13 17:33:08,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-13 17:33:08,592 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:08,592 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:08,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:08,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-13 17:33:08,819 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:08,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:08,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1208391589, now seen corresponding path program 7 times [2021-11-13 17:33:08,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:08,820 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664577173] [2021-11-13 17:33:08,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:08,820 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:08,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:09,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:09,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:09,066 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 49 proven. 41 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:09,066 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:09,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664577173] [2021-11-13 17:33:09,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664577173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:09,066 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075714093] [2021-11-13 17:33:09,066 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:33:09,066 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:09,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:09,072 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:09,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-13 17:33:09,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:09,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-13 17:33:09,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:09,231 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:33:09,232 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:33:09,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:33:09,715 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 75 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:09,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:10,053 INFO L134 CoverageAnalysis]: Checked inductivity of 118 backedges. 55 proven. 35 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:10,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075714093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:10,054 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:10,054 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 34 [2021-11-13 17:33:10,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119043180] [2021-11-13 17:33:10,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:10,055 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-13 17:33:10,055 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:10,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-13 17:33:10,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=949, Unknown=0, NotChecked=0, Total=1122 [2021-11-13 17:33:10,056 INFO L87 Difference]: Start difference. First operand 1004 states and 1137 transitions. Second operand has 34 states, 34 states have (on average 4.176470588235294) internal successors, (142), 31 states have internal predecessors, (142), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:10,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:10,901 INFO L93 Difference]: Finished difference Result 1033 states and 1155 transitions. [2021-11-13 17:33:10,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-13 17:33:10,903 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 4.176470588235294) internal successors, (142), 31 states have internal predecessors, (142), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-11-13 17:33:10,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:10,907 INFO L225 Difference]: With dead ends: 1033 [2021-11-13 17:33:10,907 INFO L226 Difference]: Without dead ends: 1028 [2021-11-13 17:33:10,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 147 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 492 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=458, Invalid=2092, Unknown=0, NotChecked=0, Total=2550 [2021-11-13 17:33:10,908 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 208 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 392.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 971 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.06ms SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 469.01ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:10,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 203 Invalid, 971 Unknown, 0 Unchecked, 3.06ms Time], IncrementalHoareTripleChecker [43 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 469.01ms Time] [2021-11-13 17:33:10,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1028 states. [2021-11-13 17:33:10,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1028 to 978. [2021-11-13 17:33:10,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 978 states, 966 states have (on average 1.1325051759834368) internal successors, (1094), 968 states have internal predecessors, (1094), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:10,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 978 states to 978 states and 1103 transitions. [2021-11-13 17:33:10,926 INFO L78 Accepts]: Start accepts. Automaton has 978 states and 1103 transitions. Word has length 82 [2021-11-13 17:33:10,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:10,927 INFO L470 AbstractCegarLoop]: Abstraction has 978 states and 1103 transitions. [2021-11-13 17:33:10,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 4.176470588235294) internal successors, (142), 31 states have internal predecessors, (142), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:10,927 INFO L276 IsEmpty]: Start isEmpty. Operand 978 states and 1103 transitions. [2021-11-13 17:33:10,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-13 17:33:10,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:10,930 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:10,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:11,151 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-13 17:33:11,151 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:11,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:11,152 INFO L85 PathProgramCache]: Analyzing trace with hash 2040468610, now seen corresponding path program 8 times [2021-11-13 17:33:11,152 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:11,152 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352524541] [2021-11-13 17:33:11,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:11,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:11,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:12,158 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:12,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:12,161 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:33:12,161 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:12,161 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352524541] [2021-11-13 17:33:12,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352524541] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:12,161 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193872921] [2021-11-13 17:33:12,162 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:33:12,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:12,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:12,162 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:12,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-13 17:33:12,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:33:12,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:33:12,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-13 17:33:12,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:12,585 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 21 treesize of output 17 [2021-11-13 17:33:12,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-13 17:33:12,954 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:12,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:13,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:33:13,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:33:13,449 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 21 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:13,449 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193872921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:13,450 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:13,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 19, 19] total 45 [2021-11-13 17:33:13,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652600140] [2021-11-13 17:33:13,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:13,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 17:33:13,451 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:13,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 17:33:13,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1848, Unknown=0, NotChecked=0, Total=1980 [2021-11-13 17:33:13,452 INFO L87 Difference]: Start difference. First operand 978 states and 1103 transitions. Second operand has 45 states, 42 states have (on average 3.2142857142857144) internal successors, (135), 41 states have internal predecessors, (135), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:18,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:18,058 INFO L93 Difference]: Finished difference Result 1747 states and 1937 transitions. [2021-11-13 17:33:18,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-13 17:33:18,063 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 3.2142857142857144) internal successors, (135), 41 states have internal predecessors, (135), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-11-13 17:33:18,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:18,072 INFO L225 Difference]: With dead ends: 1747 [2021-11-13 17:33:18,072 INFO L226 Difference]: Without dead ends: 1712 [2021-11-13 17:33:18,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 155 SyntacticMatches, 3 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 4 DeprecatedPredicates, 1930 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=601, Invalid=8519, Unknown=0, NotChecked=0, Total=9120 [2021-11-13 17:33:18,074 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 419 mSDsluCounter, 667 mSDsCounter, 0 mSdLazyCounter, 4035 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1632.87ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 732 SdHoareTripleChecker+Invalid, 4299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.80ms SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 4035 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 193 IncrementalHoareTripleChecker+Unchecked, 1928.95ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:18,074 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [419 Valid, 732 Invalid, 4299 Unknown, 0 Unchecked, 9.80ms Time], IncrementalHoareTripleChecker [71 Valid, 4035 Invalid, 0 Unknown, 193 Unchecked, 1928.95ms Time] [2021-11-13 17:33:18,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1712 states. [2021-11-13 17:33:18,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1712 to 1502. [2021-11-13 17:33:18,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1502 states, 1487 states have (on average 1.13315400134499) internal successors, (1685), 1489 states have internal predecessors, (1685), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:18,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1502 states to 1502 states and 1697 transitions. [2021-11-13 17:33:18,116 INFO L78 Accepts]: Start accepts. Automaton has 1502 states and 1697 transitions. Word has length 86 [2021-11-13 17:33:18,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:18,116 INFO L470 AbstractCegarLoop]: Abstraction has 1502 states and 1697 transitions. [2021-11-13 17:33:18,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 42 states have (on average 3.2142857142857144) internal successors, (135), 41 states have internal predecessors, (135), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:18,117 INFO L276 IsEmpty]: Start isEmpty. Operand 1502 states and 1697 transitions. [2021-11-13 17:33:18,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-13 17:33:18,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:18,120 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:18,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:18,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:18,335 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:18,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:18,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1166482891, now seen corresponding path program 6 times [2021-11-13 17:33:18,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:18,336 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54989807] [2021-11-13 17:33:18,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:18,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:18,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:18,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:18,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:18,554 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 6 proven. 102 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:33:18,554 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:18,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54989807] [2021-11-13 17:33:18,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54989807] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:18,554 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62000917] [2021-11-13 17:33:18,555 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:33:18,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:18,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:18,557 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:18,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-13 17:33:18,688 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-13 17:33:18,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:33:18,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-13 17:33:18,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:18,722 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:33:18,722 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:33:18,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:33:19,405 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 15 proven. 93 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:33:19,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:20,203 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 28 proven. 80 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:33:20,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62000917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:20,203 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:20,203 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 43 [2021-11-13 17:33:20,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574207251] [2021-11-13 17:33:20,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:20,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-13 17:33:20,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:20,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-13 17:33:20,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1715, Unknown=0, NotChecked=0, Total=1892 [2021-11-13 17:33:20,205 INFO L87 Difference]: Start difference. First operand 1502 states and 1697 transitions. Second operand has 44 states, 43 states have (on average 5.3023255813953485) internal successors, (228), 40 states have internal predecessors, (228), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:22,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:22,598 INFO L93 Difference]: Finished difference Result 1626 states and 1804 transitions. [2021-11-13 17:33:22,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-13 17:33:22,599 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 5.3023255813953485) internal successors, (228), 40 states have internal predecessors, (228), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-11-13 17:33:22,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:22,605 INFO L225 Difference]: With dead ends: 1626 [2021-11-13 17:33:22,605 INFO L226 Difference]: Without dead ends: 1626 [2021-11-13 17:33:22,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=743, Invalid=4957, Unknown=0, NotChecked=0, Total=5700 [2021-11-13 17:33:22,606 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 829 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 2167 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 863.98ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 829 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 2359 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.81ms SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 2167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1028.50ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:22,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [829 Valid, 307 Invalid, 2359 Unknown, 0 Unchecked, 6.81ms Time], IncrementalHoareTripleChecker [192 Valid, 2167 Invalid, 0 Unknown, 0 Unchecked, 1028.50ms Time] [2021-11-13 17:33:22,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1626 states. [2021-11-13 17:33:22,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1626 to 1456. [2021-11-13 17:33:22,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1456 states, 1441 states have (on average 1.128383067314365) internal successors, (1626), 1443 states have internal predecessors, (1626), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:22,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1456 states to 1456 states and 1638 transitions. [2021-11-13 17:33:22,627 INFO L78 Accepts]: Start accepts. Automaton has 1456 states and 1638 transitions. Word has length 87 [2021-11-13 17:33:22,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:22,628 INFO L470 AbstractCegarLoop]: Abstraction has 1456 states and 1638 transitions. [2021-11-13 17:33:22,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 5.3023255813953485) internal successors, (228), 40 states have internal predecessors, (228), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:22,628 INFO L276 IsEmpty]: Start isEmpty. Operand 1456 states and 1638 transitions. [2021-11-13 17:33:22,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 17:33:22,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:22,631 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:22,671 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-13 17:33:22,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:22,847 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:22,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:22,848 INFO L85 PathProgramCache]: Analyzing trace with hash -610960840, now seen corresponding path program 7 times [2021-11-13 17:33:22,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:22,848 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469281786] [2021-11-13 17:33:22,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:22,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:22,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:23,241 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:23,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:23,251 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:33:23,252 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:23,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469281786] [2021-11-13 17:33:23,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469281786] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:23,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657208956] [2021-11-13 17:33:23,252 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:33:23,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:23,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:23,253 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:23,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-13 17:33:23,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:23,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-13 17:33:23,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:23,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:33:23,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:33:23,731 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:33:23,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:33:27,087 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-13 17:33:27,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 56 [2021-11-13 17:33:27,154 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:33:27,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:28,280 WARN L838 $PredicateComparison]: unable to prove that (forall ((main_~nondetString2~0.offset Int) (main_~length2~0 Int)) (= 0 (select (select (store |c_#memory_int| c_main_~nondetString2~0.base (store (select |c_#memory_int| c_main_~nondetString2~0.base) (+ (- 1) main_~nondetString2~0.offset main_~length2~0) 0)) c_main_~nondetString1~0.base) (+ 3 c_main_~nondetString1~0.offset)))) is different from false [2021-11-13 17:33:28,284 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 56 treesize of output 50 [2021-11-13 17:33:28,589 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:33:28,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657208956] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:28,589 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:28,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 52 [2021-11-13 17:33:28,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629437450] [2021-11-13 17:33:28,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:28,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-13 17:33:28,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:28,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-13 17:33:28,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=2388, Unknown=1, NotChecked=98, Total=2652 [2021-11-13 17:33:28,591 INFO L87 Difference]: Start difference. First operand 1456 states and 1638 transitions. Second operand has 52 states, 50 states have (on average 3.4) internal successors, (170), 48 states have internal predecessors, (170), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:36,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:36,657 INFO L93 Difference]: Finished difference Result 1461 states and 1635 transitions. [2021-11-13 17:33:36,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 17:33:36,657 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 50 states have (on average 3.4) internal successors, (170), 48 states have internal predecessors, (170), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-13 17:33:36,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:36,663 INFO L225 Difference]: With dead ends: 1461 [2021-11-13 17:33:36,663 INFO L226 Difference]: Without dead ends: 1276 [2021-11-13 17:33:36,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 879 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=305, Invalid=4526, Unknown=3, NotChecked=136, Total=4970 [2021-11-13 17:33:36,664 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 81 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 265.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 475 SdHoareTripleChecker+Invalid, 1488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.23ms SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 740 IncrementalHoareTripleChecker+Unchecked, 328.07ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:36,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 475 Invalid, 1488 Unknown, 0 Unchecked, 5.23ms Time], IncrementalHoareTripleChecker [10 Valid, 738 Invalid, 0 Unknown, 740 Unchecked, 328.07ms Time] [2021-11-13 17:33:36,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1276 states. [2021-11-13 17:33:36,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1276 to 1249. [2021-11-13 17:33:36,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1249 states, 1235 states have (on average 1.1319838056680163) internal successors, (1398), 1237 states have internal predecessors, (1398), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:36,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1249 states to 1249 states and 1409 transitions. [2021-11-13 17:33:36,686 INFO L78 Accepts]: Start accepts. Automaton has 1249 states and 1409 transitions. Word has length 90 [2021-11-13 17:33:36,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:36,686 INFO L470 AbstractCegarLoop]: Abstraction has 1249 states and 1409 transitions. [2021-11-13 17:33:36,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 50 states have (on average 3.4) internal successors, (170), 48 states have internal predecessors, (170), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:36,686 INFO L276 IsEmpty]: Start isEmpty. Operand 1249 states and 1409 transitions. [2021-11-13 17:33:36,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 17:33:36,689 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:36,690 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:36,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:36,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:36,903 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:36,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:36,904 INFO L85 PathProgramCache]: Analyzing trace with hash 1484811926, now seen corresponding path program 8 times [2021-11-13 17:33:36,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:36,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841033657] [2021-11-13 17:33:36,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:36,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:36,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:37,588 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:37,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:37,591 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 25 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 17:33:37,591 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:37,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841033657] [2021-11-13 17:33:37,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841033657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:37,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066983094] [2021-11-13 17:33:37,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:33:37,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:37,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:37,592 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:37,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-13 17:33:37,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:33:37,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:33:37,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-13 17:33:37,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:37,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:33:38,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:33:38,104 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:33:38,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:33:41,644 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-13 17:33:41,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 56 [2021-11-13 17:33:41,697 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 25 proven. 80 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:33:41,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:43,184 WARN L838 $PredicateComparison]: unable to prove that (forall ((main_~nondetString2~0.offset Int) (main_~length2~0 Int)) (= 0 (select (select (store |c_#memory_int| c_main_~nondetString2~0.base (store (select |c_#memory_int| c_main_~nondetString2~0.base) (+ (- 1) main_~nondetString2~0.offset main_~length2~0) 0)) c_main_~nondetString1~0.base) (+ 3 c_main_~nondetString1~0.offset)))) is different from false [2021-11-13 17:33:43,189 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 56 treesize of output 50 [2021-11-13 17:33:43,548 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 25 proven. 80 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:33:43,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066983094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:43,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:43,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 22] total 56 [2021-11-13 17:33:43,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497713931] [2021-11-13 17:33:43,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:43,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-13 17:33:43,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:43,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-13 17:33:43,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2780, Unknown=1, NotChecked=106, Total=3080 [2021-11-13 17:33:43,549 INFO L87 Difference]: Start difference. First operand 1249 states and 1409 transitions. Second operand has 56 states, 54 states have (on average 3.240740740740741) internal successors, (175), 52 states have internal predecessors, (175), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:50,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:50,831 INFO L93 Difference]: Finished difference Result 1253 states and 1409 transitions. [2021-11-13 17:33:50,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-13 17:33:50,831 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 54 states have (on average 3.240740740740741) internal successors, (175), 52 states have internal predecessors, (175), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-13 17:33:50,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:50,836 INFO L225 Difference]: With dead ends: 1253 [2021-11-13 17:33:50,836 INFO L226 Difference]: Without dead ends: 1088 [2021-11-13 17:33:50,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 76 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1219 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=402, Invalid=5451, Unknown=3, NotChecked=150, Total=6006 [2021-11-13 17:33:50,837 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 109 mSDsluCounter, 495 mSDsCounter, 0 mSdLazyCounter, 1072 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 405.64ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 2373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.79ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1072 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1285 IncrementalHoareTripleChecker+Unchecked, 497.11ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:50,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 538 Invalid, 2373 Unknown, 0 Unchecked, 6.79ms Time], IncrementalHoareTripleChecker [16 Valid, 1072 Invalid, 0 Unknown, 1285 Unchecked, 497.11ms Time] [2021-11-13 17:33:50,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1088 states. [2021-11-13 17:33:50,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1088 to 1088. [2021-11-13 17:33:50,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1088 states, 1076 states have (on average 1.1431226765799256) internal successors, (1230), 1078 states have internal predecessors, (1230), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:50,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1088 states to 1088 states and 1239 transitions. [2021-11-13 17:33:50,859 INFO L78 Accepts]: Start accepts. Automaton has 1088 states and 1239 transitions. Word has length 90 [2021-11-13 17:33:50,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:50,859 INFO L470 AbstractCegarLoop]: Abstraction has 1088 states and 1239 transitions. [2021-11-13 17:33:50,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 54 states have (on average 3.240740740740741) internal successors, (175), 52 states have internal predecessors, (175), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:50,859 INFO L276 IsEmpty]: Start isEmpty. Operand 1088 states and 1239 transitions. [2021-11-13 17:33:50,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 17:33:50,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:50,862 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:50,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:51,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:51,087 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:51,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:51,088 INFO L85 PathProgramCache]: Analyzing trace with hash 520456662, now seen corresponding path program 9 times [2021-11-13 17:33:51,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:51,088 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345957392] [2021-11-13 17:33:51,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:51,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:51,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:51,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:51,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:51,343 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 6 proven. 112 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:33:51,343 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:51,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345957392] [2021-11-13 17:33:51,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345957392] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:51,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389607131] [2021-11-13 17:33:51,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:33:51,344 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:51,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:51,348 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:51,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-13 17:33:51,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-13 17:33:51,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:33:51,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-13 17:33:51,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:51,763 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 21 treesize of output 17 [2021-11-13 17:33:52,498 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-13 17:33:52,498 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 24 treesize of output 16 [2021-11-13 17:33:52,564 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 93 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-13 17:33:52,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:52,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:33:52,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:33:53,107 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 10 proven. 93 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-13 17:33:53,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389607131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:53,107 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:53,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 17] total 40 [2021-11-13 17:33:53,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854273449] [2021-11-13 17:33:53,108 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:53,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-13 17:33:53,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:53,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-13 17:33:53,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1458, Unknown=0, NotChecked=0, Total=1560 [2021-11-13 17:33:53,109 INFO L87 Difference]: Start difference. First operand 1088 states and 1239 transitions. Second operand has 40 states, 38 states have (on average 4.657894736842105) internal successors, (177), 36 states have internal predecessors, (177), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:56,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:33:56,595 INFO L93 Difference]: Finished difference Result 1115 states and 1246 transitions. [2021-11-13 17:33:56,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-13 17:33:56,596 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 4.657894736842105) internal successors, (177), 36 states have internal predecessors, (177), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-13 17:33:56,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:33:56,600 INFO L225 Difference]: With dead ends: 1115 [2021-11-13 17:33:56,600 INFO L226 Difference]: Without dead ends: 1103 [2021-11-13 17:33:56,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 7 DeprecatedPredicates, 1627 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=596, Invalid=6886, Unknown=0, NotChecked=0, Total=7482 [2021-11-13 17:33:56,601 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 205 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 1885 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 876.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 3732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.33ms SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1885 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1821 IncrementalHoareTripleChecker+Unchecked, 1049.68ms IncrementalHoareTripleChecker+Time [2021-11-13 17:33:56,601 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 403 Invalid, 3732 Unknown, 0 Unchecked, 10.33ms Time], IncrementalHoareTripleChecker [26 Valid, 1885 Invalid, 0 Unknown, 1821 Unchecked, 1049.68ms Time] [2021-11-13 17:33:56,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1103 states. [2021-11-13 17:33:56,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1103 to 893. [2021-11-13 17:33:56,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 893 states, 881 states have (on average 1.133938706015891) internal successors, (999), 883 states have internal predecessors, (999), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:56,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 893 states to 893 states and 1008 transitions. [2021-11-13 17:33:56,622 INFO L78 Accepts]: Start accepts. Automaton has 893 states and 1008 transitions. Word has length 90 [2021-11-13 17:33:56,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:33:56,622 INFO L470 AbstractCegarLoop]: Abstraction has 893 states and 1008 transitions. [2021-11-13 17:33:56,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 4.657894736842105) internal successors, (177), 36 states have internal predecessors, (177), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:33:56,623 INFO L276 IsEmpty]: Start isEmpty. Operand 893 states and 1008 transitions. [2021-11-13 17:33:56,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-13 17:33:56,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:33:56,625 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:33:56,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-13 17:33:56,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-13 17:33:56,842 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:33:56,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:33:56,842 INFO L85 PathProgramCache]: Analyzing trace with hash 2096045983, now seen corresponding path program 9 times [2021-11-13 17:33:56,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:33:56,842 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326401825] [2021-11-13 17:33:56,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:33:56,842 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:33:56,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:57,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:33:57,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:33:57,223 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 15 proven. 105 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:57,223 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:33:57,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326401825] [2021-11-13 17:33:57,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326401825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:33:57,224 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341003138] [2021-11-13 17:33:57,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:33:57,224 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:33:57,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:33:57,228 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:33:57,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-13 17:33:57,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-13 17:33:57,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:33:57,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 17:33:57,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:33:57,542 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:33:57,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:33:58,383 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 28 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:58,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:33:59,326 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 45 proven. 75 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:33:59,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341003138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:33:59,327 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:33:59,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 50 [2021-11-13 17:33:59,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040743878] [2021-11-13 17:33:59,327 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:33:59,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 17:33:59,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:33:59,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 17:33:59,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=2241, Unknown=0, NotChecked=0, Total=2550 [2021-11-13 17:33:59,329 INFO L87 Difference]: Start difference. First operand 893 states and 1008 transitions. Second operand has 51 states, 49 states have (on average 4.346938775510204) internal successors, (213), 47 states have internal predecessors, (213), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:00,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:34:00,681 INFO L93 Difference]: Finished difference Result 1249 states and 1409 transitions. [2021-11-13 17:34:00,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-13 17:34:00,682 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 4.346938775510204) internal successors, (213), 47 states have internal predecessors, (213), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-13 17:34:00,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:34:00,687 INFO L225 Difference]: With dead ends: 1249 [2021-11-13 17:34:00,687 INFO L226 Difference]: Without dead ends: 1249 [2021-11-13 17:34:00,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1139 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=554, Invalid=3606, Unknown=0, NotChecked=0, Total=4160 [2021-11-13 17:34:00,688 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 603 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 1727 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 684.71ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 603 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 1776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.88ms SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1727 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 821.87ms IncrementalHoareTripleChecker+Time [2021-11-13 17:34:00,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [603 Valid, 222 Invalid, 1776 Unknown, 0 Unchecked, 6.88ms Time], IncrementalHoareTripleChecker [49 Valid, 1727 Invalid, 0 Unknown, 0 Unchecked, 821.87ms Time] [2021-11-13 17:34:00,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1249 states. [2021-11-13 17:34:00,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1249 to 1091. [2021-11-13 17:34:00,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1091 states, 1079 states have (on average 1.150139017608897) internal successors, (1241), 1081 states have internal predecessors, (1241), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:00,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1091 states to 1091 states and 1250 transitions. [2021-11-13 17:34:00,704 INFO L78 Accepts]: Start accepts. Automaton has 1091 states and 1250 transitions. Word has length 90 [2021-11-13 17:34:00,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:34:00,704 INFO L470 AbstractCegarLoop]: Abstraction has 1091 states and 1250 transitions. [2021-11-13 17:34:00,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 4.346938775510204) internal successors, (213), 47 states have internal predecessors, (213), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:00,705 INFO L276 IsEmpty]: Start isEmpty. Operand 1091 states and 1250 transitions. [2021-11-13 17:34:00,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-13 17:34:00,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:34:00,707 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:34:00,748 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2021-11-13 17:34:00,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-13 17:34:00,923 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:34:00,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:34:00,924 INFO L85 PathProgramCache]: Analyzing trace with hash 102270395, now seen corresponding path program 8 times [2021-11-13 17:34:00,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:34:00,924 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522145607] [2021-11-13 17:34:00,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:34:00,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:34:00,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:01,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:34:01,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:01,359 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 41 proven. 102 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:34:01,359 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:34:01,359 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522145607] [2021-11-13 17:34:01,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522145607] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:34:01,360 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [896085907] [2021-11-13 17:34:01,360 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:34:01,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:01,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:34:01,364 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:34:01,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-13 17:34:01,526 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:34:01,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:34:01,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-13 17:34:01,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:34:01,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:34:01,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-13 17:34:01,855 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:34:01,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2021-11-13 17:34:04,038 INFO L354 Elim1Store]: treesize reduction 33, result has 26.7 percent of original size [2021-11-13 17:34:04,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 41 [2021-11-13 17:34:04,234 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 15 proven. 128 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:34:04,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:34:06,589 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 36 treesize of output 34 [2021-11-13 17:34:06,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 42 [2021-11-13 17:34:06,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2021-11-13 17:34:06,895 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 15 proven. 128 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:34:06,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [896085907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:34:06,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:34:06,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 17] total 51 [2021-11-13 17:34:06,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630697017] [2021-11-13 17:34:06,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:34:06,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 17:34:06,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:34:06,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 17:34:06,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2347, Unknown=0, NotChecked=0, Total=2550 [2021-11-13 17:34:06,897 INFO L87 Difference]: Start difference. First operand 1091 states and 1250 transitions. Second operand has 51 states, 50 states have (on average 5.1) internal successors, (255), 47 states have internal predecessors, (255), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:08,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:34:08,047 INFO L93 Difference]: Finished difference Result 1672 states and 1900 transitions. [2021-11-13 17:34:08,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 17:34:08,047 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 5.1) internal successors, (255), 47 states have internal predecessors, (255), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-11-13 17:34:08,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:34:08,055 INFO L225 Difference]: With dead ends: 1672 [2021-11-13 17:34:08,056 INFO L226 Difference]: Without dead ends: 1528 [2021-11-13 17:34:08,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 161 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=379, Invalid=4043, Unknown=0, NotChecked=0, Total=4422 [2021-11-13 17:34:08,057 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 267 mSDsluCounter, 845 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 282.18ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 889 SdHoareTripleChecker+Invalid, 1080 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.64ms SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 338 IncrementalHoareTripleChecker+Unchecked, 349.17ms IncrementalHoareTripleChecker+Time [2021-11-13 17:34:08,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [267 Valid, 889 Invalid, 1080 Unknown, 0 Unchecked, 3.64ms Time], IncrementalHoareTripleChecker [12 Valid, 730 Invalid, 0 Unknown, 338 Unchecked, 349.17ms Time] [2021-11-13 17:34:08,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1528 states. [2021-11-13 17:34:08,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1528 to 1514. [2021-11-13 17:34:08,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1514 states, 1500 states have (on average 1.1473333333333333) internal successors, (1721), 1502 states have internal predecessors, (1721), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:08,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1514 states to 1514 states and 1732 transitions. [2021-11-13 17:34:08,083 INFO L78 Accepts]: Start accepts. Automaton has 1514 states and 1732 transitions. Word has length 92 [2021-11-13 17:34:08,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:34:08,084 INFO L470 AbstractCegarLoop]: Abstraction has 1514 states and 1732 transitions. [2021-11-13 17:34:08,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 5.1) internal successors, (255), 47 states have internal predecessors, (255), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:08,084 INFO L276 IsEmpty]: Start isEmpty. Operand 1514 states and 1732 transitions. [2021-11-13 17:34:08,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-13 17:34:08,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:34:08,087 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:34:08,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-13 17:34:08,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-13 17:34:08,305 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:34:08,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:34:08,305 INFO L85 PathProgramCache]: Analyzing trace with hash -401824019, now seen corresponding path program 10 times [2021-11-13 17:34:08,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:34:08,305 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715048241] [2021-11-13 17:34:08,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:34:08,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:34:08,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:08,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:34:08,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:08,599 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 61 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:34:08,599 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:34:08,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715048241] [2021-11-13 17:34:08,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715048241] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:34:08,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806058675] [2021-11-13 17:34:08,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:34:08,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:08,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:34:08,604 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:34:08,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-13 17:34:08,746 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:34:08,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:34:08,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 17:34:08,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:34:08,780 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:34:08,781 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:34:08,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:34:09,491 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 111 proven. 28 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:34:09,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:34:09,948 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 86 proven. 53 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:34:09,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806058675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:34:09,949 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:34:09,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 39 [2021-11-13 17:34:09,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415049630] [2021-11-13 17:34:09,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:34:09,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-13 17:34:09,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:34:09,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-13 17:34:09,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1252, Unknown=0, NotChecked=0, Total=1482 [2021-11-13 17:34:09,951 INFO L87 Difference]: Start difference. First operand 1514 states and 1732 transitions. Second operand has 39 states, 39 states have (on average 4.3076923076923075) internal successors, (168), 36 states have internal predecessors, (168), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:11,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:34:11,036 INFO L93 Difference]: Finished difference Result 1624 states and 1827 transitions. [2021-11-13 17:34:11,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-13 17:34:11,036 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 4.3076923076923075) internal successors, (168), 36 states have internal predecessors, (168), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-11-13 17:34:11,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:34:11,042 INFO L225 Difference]: With dead ends: 1624 [2021-11-13 17:34:11,042 INFO L226 Difference]: Without dead ends: 1619 [2021-11-13 17:34:11,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=606, Invalid=2816, Unknown=0, NotChecked=0, Total=3422 [2021-11-13 17:34:11,043 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 255 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 1115 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 484.25ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 1180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.31ms SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 580.41ms IncrementalHoareTripleChecker+Time [2021-11-13 17:34:11,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 204 Invalid, 1180 Unknown, 0 Unchecked, 4.31ms Time], IncrementalHoareTripleChecker [65 Valid, 1115 Invalid, 0 Unknown, 0 Unchecked, 580.41ms Time] [2021-11-13 17:34:11,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1619 states. [2021-11-13 17:34:11,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1619 to 1473. [2021-11-13 17:34:11,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1473 states, 1459 states have (on average 1.1432488005483208) internal successors, (1668), 1461 states have internal predecessors, (1668), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:11,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1473 states to 1473 states and 1679 transitions. [2021-11-13 17:34:11,063 INFO L78 Accepts]: Start accepts. Automaton has 1473 states and 1679 transitions. Word has length 97 [2021-11-13 17:34:11,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:34:11,063 INFO L470 AbstractCegarLoop]: Abstraction has 1473 states and 1679 transitions. [2021-11-13 17:34:11,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 4.3076923076923075) internal successors, (168), 36 states have internal predecessors, (168), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:11,064 INFO L276 IsEmpty]: Start isEmpty. Operand 1473 states and 1679 transitions. [2021-11-13 17:34:11,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-13 17:34:11,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:34:11,066 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:34:11,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-13 17:34:11,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:11,266 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:34:11,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:34:11,266 INFO L85 PathProgramCache]: Analyzing trace with hash 710647936, now seen corresponding path program 10 times [2021-11-13 17:34:11,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:34:11,267 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66603099] [2021-11-13 17:34:11,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:34:11,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:34:11,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:12,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:34:12,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:12,313 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 25 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:34:12,313 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:34:12,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66603099] [2021-11-13 17:34:12,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66603099] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:34:12,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975978740] [2021-11-13 17:34:12,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:34:12,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:12,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:34:12,319 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:34:12,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-13 17:34:12,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:34:12,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:34:12,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 17:34:12,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:34:12,494 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:34:12,495 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:34:12,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:34:13,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:34:13,330 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-13 17:34:13,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-13 17:34:14,985 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 17:34:14,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 57 [2021-11-13 17:34:15,015 INFO L354 Elim1Store]: treesize reduction 56, result has 33.3 percent of original size [2021-11-13 17:34:15,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 57 treesize of output 59 [2021-11-13 17:34:15,076 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 69 proven. 72 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:34:15,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:34:23,193 INFO L354 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2021-11-13 17:34:23,194 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 370 treesize of output 334 [2021-11-13 17:34:24,122 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 61 proven. 80 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:34:24,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975978740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:34:24,122 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:34:24,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 24, 24] total 72 [2021-11-13 17:34:24,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169671837] [2021-11-13 17:34:24,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:34:24,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-13 17:34:24,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:34:24,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-13 17:34:24,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=4833, Unknown=2, NotChecked=0, Total=5112 [2021-11-13 17:34:24,124 INFO L87 Difference]: Start difference. First operand 1473 states and 1679 transitions. Second operand has 72 states, 69 states have (on average 3.536231884057971) internal successors, (244), 68 states have internal predecessors, (244), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:34,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:34:34,888 INFO L93 Difference]: Finished difference Result 1464 states and 1664 transitions. [2021-11-13 17:34:34,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-13 17:34:34,889 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 69 states have (on average 3.536231884057971) internal successors, (244), 68 states have internal predecessors, (244), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-11-13 17:34:34,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:34:34,894 INFO L225 Difference]: With dead ends: 1464 [2021-11-13 17:34:34,894 INFO L226 Difference]: Without dead ends: 1331 [2021-11-13 17:34:34,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 170 SyntacticMatches, 2 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2618 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=1013, Invalid=12093, Unknown=4, NotChecked=0, Total=13110 [2021-11-13 17:34:34,896 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 171 mSDsluCounter, 593 mSDsCounter, 0 mSdLazyCounter, 1616 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 642.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 643 SdHoareTripleChecker+Invalid, 3303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.24ms SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1616 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1641 IncrementalHoareTripleChecker+Unchecked, 760.73ms IncrementalHoareTripleChecker+Time [2021-11-13 17:34:34,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 643 Invalid, 3303 Unknown, 0 Unchecked, 6.24ms Time], IncrementalHoareTripleChecker [46 Valid, 1616 Invalid, 0 Unknown, 1641 Unchecked, 760.73ms Time] [2021-11-13 17:34:34,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1331 states. [2021-11-13 17:34:34,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1331 to 1316. [2021-11-13 17:34:34,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1316 states, 1303 states have (on average 1.145817344589409) internal successors, (1493), 1305 states have internal predecessors, (1493), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:34,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1316 states to 1316 states and 1503 transitions. [2021-11-13 17:34:34,917 INFO L78 Accepts]: Start accepts. Automaton has 1316 states and 1503 transitions. Word has length 98 [2021-11-13 17:34:34,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:34:34,917 INFO L470 AbstractCegarLoop]: Abstraction has 1316 states and 1503 transitions. [2021-11-13 17:34:34,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 69 states have (on average 3.536231884057971) internal successors, (244), 68 states have internal predecessors, (244), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:34,918 INFO L276 IsEmpty]: Start isEmpty. Operand 1316 states and 1503 transitions. [2021-11-13 17:34:34,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-13 17:34:34,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:34:34,920 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:34:34,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-13 17:34:35,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-13 17:34:35,135 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:34:35,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:34:35,136 INFO L85 PathProgramCache]: Analyzing trace with hash -811961944, now seen corresponding path program 11 times [2021-11-13 17:34:35,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:34:35,136 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476394733] [2021-11-13 17:34:35,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:34:35,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:34:35,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:35,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:34:35,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:35,545 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 25 proven. 106 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:34:35,545 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:34:35,545 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476394733] [2021-11-13 17:34:35,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476394733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:34:35,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938889171] [2021-11-13 17:34:35,546 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:34:35,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:35,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:34:35,554 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:34:35,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-13 17:34:35,704 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-13 17:34:35,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:34:35,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-13 17:34:35,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:34:35,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:34:36,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-13 17:34:36,144 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:34:36,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2021-11-13 17:34:37,780 INFO L354 Elim1Store]: treesize reduction 40, result has 54.0 percent of original size [2021-11-13 17:34:37,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 59 treesize of output 79 [2021-11-13 17:34:38,020 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 15 proven. 116 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:34:38,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:34:42,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:34:42,124 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-13 17:34:42,124 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 412 treesize of output 368 [2021-11-13 17:34:42,668 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 15 proven. 116 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-13 17:34:42,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938889171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:34:42,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:34:42,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 22] total 66 [2021-11-13 17:34:42,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366588955] [2021-11-13 17:34:42,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:34:42,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-13 17:34:42,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:34:42,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-13 17:34:42,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=4028, Unknown=1, NotChecked=0, Total=4290 [2021-11-13 17:34:42,670 INFO L87 Difference]: Start difference. First operand 1316 states and 1503 transitions. Second operand has 66 states, 64 states have (on average 3.703125) internal successors, (237), 62 states have internal predecessors, (237), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:53,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:34:53,893 INFO L93 Difference]: Finished difference Result 1629 states and 1831 transitions. [2021-11-13 17:34:53,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-13 17:34:53,894 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 64 states have (on average 3.703125) internal successors, (237), 62 states have internal predecessors, (237), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-11-13 17:34:53,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:34:53,902 INFO L225 Difference]: With dead ends: 1629 [2021-11-13 17:34:53,902 INFO L226 Difference]: Without dead ends: 1579 [2021-11-13 17:34:53,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1931 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=809, Invalid=10746, Unknown=1, NotChecked=0, Total=11556 [2021-11-13 17:34:53,918 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 174 mSDsluCounter, 863 mSDsCounter, 0 mSdLazyCounter, 648 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 267.43ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 921 SdHoareTripleChecker+Invalid, 1448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.07ms SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 648 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 778 IncrementalHoareTripleChecker+Unchecked, 319.11ms IncrementalHoareTripleChecker+Time [2021-11-13 17:34:53,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 921 Invalid, 1448 Unknown, 0 Unchecked, 4.07ms Time], IncrementalHoareTripleChecker [22 Valid, 648 Invalid, 0 Unknown, 778 Unchecked, 319.11ms Time] [2021-11-13 17:34:53,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1579 states. [2021-11-13 17:34:53,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1579 to 1379. [2021-11-13 17:34:53,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1379 states, 1366 states have (on average 1.1412884333821376) internal successors, (1559), 1368 states have internal predecessors, (1559), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:53,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1379 states to 1379 states and 1569 transitions. [2021-11-13 17:34:53,941 INFO L78 Accepts]: Start accepts. Automaton has 1379 states and 1569 transitions. Word has length 98 [2021-11-13 17:34:53,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:34:53,942 INFO L470 AbstractCegarLoop]: Abstraction has 1379 states and 1569 transitions. [2021-11-13 17:34:53,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 64 states have (on average 3.703125) internal successors, (237), 62 states have internal predecessors, (237), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:34:53,942 INFO L276 IsEmpty]: Start isEmpty. Operand 1379 states and 1569 transitions. [2021-11-13 17:34:53,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-13 17:34:53,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:34:53,945 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:34:53,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-13 17:34:54,159 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:54,160 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:34:54,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:34:54,160 INFO L85 PathProgramCache]: Analyzing trace with hash 1753604698, now seen corresponding path program 12 times [2021-11-13 17:34:54,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:34:54,160 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951878434] [2021-11-13 17:34:54,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:34:54,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:34:54,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:55,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:34:55,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:34:55,006 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 25 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:34:55,006 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:34:55,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951878434] [2021-11-13 17:34:55,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951878434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:34:55,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823560256] [2021-11-13 17:34:55,007 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:34:55,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:34:55,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:34:55,008 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:34:55,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-13 17:34:55,252 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-13 17:34:55,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:34:55,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-13 17:34:55,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:34:55,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:34:55,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:34:55,876 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:34:55,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:34:59,742 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-13 17:34:59,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 56 [2021-11-13 17:34:59,804 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 25 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:34:59,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:35:12,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:35:12,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:35:13,171 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 25 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:35:13,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823560256] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:35:13,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:35:13,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 24, 23] total 61 [2021-11-13 17:35:13,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932781017] [2021-11-13 17:35:13,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:35:13,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-13 17:35:13,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:35:13,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-13 17:35:13,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=3448, Unknown=0, NotChecked=0, Total=3660 [2021-11-13 17:35:13,173 INFO L87 Difference]: Start difference. First operand 1379 states and 1569 transitions. Second operand has 61 states, 60 states have (on average 3.3666666666666667) internal successors, (202), 57 states have internal predecessors, (202), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:15,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:35:15,355 INFO L93 Difference]: Finished difference Result 1390 states and 1577 transitions. [2021-11-13 17:35:15,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-13 17:35:15,356 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 3.3666666666666667) internal successors, (202), 57 states have internal predecessors, (202), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-11-13 17:35:15,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:35:15,360 INFO L225 Difference]: With dead ends: 1390 [2021-11-13 17:35:15,361 INFO L226 Difference]: Without dead ends: 1390 [2021-11-13 17:35:15,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 164 SyntacticMatches, 4 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1658 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=464, Invalid=7192, Unknown=0, NotChecked=0, Total=7656 [2021-11-13 17:35:15,362 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 135 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 1366 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 565.96ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 2548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.89ms SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1150 IncrementalHoareTripleChecker+Unchecked, 683.03ms IncrementalHoareTripleChecker+Time [2021-11-13 17:35:15,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 589 Invalid, 2548 Unknown, 0 Unchecked, 5.89ms Time], IncrementalHoareTripleChecker [32 Valid, 1366 Invalid, 0 Unknown, 1150 Unchecked, 683.03ms Time] [2021-11-13 17:35:15,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2021-11-13 17:35:15,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 1372. [2021-11-13 17:35:15,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1372 states, 1359 states have (on average 1.1398086828550404) internal successors, (1549), 1361 states have internal predecessors, (1549), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:15,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1372 states to 1372 states and 1559 transitions. [2021-11-13 17:35:15,382 INFO L78 Accepts]: Start accepts. Automaton has 1372 states and 1559 transitions. Word has length 98 [2021-11-13 17:35:15,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:35:15,382 INFO L470 AbstractCegarLoop]: Abstraction has 1372 states and 1559 transitions. [2021-11-13 17:35:15,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 3.3666666666666667) internal successors, (202), 57 states have internal predecessors, (202), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:15,383 INFO L276 IsEmpty]: Start isEmpty. Operand 1372 states and 1559 transitions. [2021-11-13 17:35:15,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-13 17:35:15,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:35:15,385 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:35:15,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-13 17:35:15,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-11-13 17:35:15,585 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:35:15,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:35:15,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1244056464, now seen corresponding path program 11 times [2021-11-13 17:35:15,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:35:15,586 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675975797] [2021-11-13 17:35:15,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:35:15,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:35:15,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:16,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:35:16,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:16,981 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 26 proven. 175 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:35:16,981 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:35:16,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675975797] [2021-11-13 17:35:16,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675975797] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:35:16,981 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059595198] [2021-11-13 17:35:16,981 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:35:16,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:35:16,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:35:16,982 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:35:16,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-13 17:35:17,214 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-13 17:35:17,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:35:17,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-13 17:35:17,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:35:17,256 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:35:17,256 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:35:18,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-13 17:35:18,884 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:35:18,885 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 19 treesize of output 19 [2021-11-13 17:35:19,281 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 1 proven. 185 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:35:19,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:35:20,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:35:20,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:35:21,808 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 45 proven. 111 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:35:21,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059595198] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:35:21,808 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:35:21,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 23, 22] total 74 [2021-11-13 17:35:21,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477102616] [2021-11-13 17:35:21,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:35:21,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-13 17:35:21,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:35:21,810 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-13 17:35:21,810 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=5088, Unknown=0, NotChecked=0, Total=5402 [2021-11-13 17:35:21,810 INFO L87 Difference]: Start difference. First operand 1372 states and 1559 transitions. Second operand has 74 states, 71 states have (on average 3.6338028169014085) internal successors, (258), 70 states have internal predecessors, (258), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:33,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:35:33,481 INFO L93 Difference]: Finished difference Result 2106 states and 2351 transitions. [2021-11-13 17:35:33,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-13 17:35:33,496 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 71 states have (on average 3.6338028169014085) internal successors, (258), 70 states have internal predecessors, (258), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-11-13 17:35:33,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:35:33,501 INFO L225 Difference]: With dead ends: 2106 [2021-11-13 17:35:33,501 INFO L226 Difference]: Without dead ends: 2088 [2021-11-13 17:35:33,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2949 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1355, Invalid=17005, Unknown=0, NotChecked=0, Total=18360 [2021-11-13 17:35:33,503 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 1155 mSDsluCounter, 911 mSDsCounter, 0 mSdLazyCounter, 9761 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4892.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1155 SdHoareTripleChecker+Valid, 1007 SdHoareTripleChecker+Invalid, 9913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 33.18ms SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 9761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5793.26ms IncrementalHoareTripleChecker+Time [2021-11-13 17:35:33,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1155 Valid, 1007 Invalid, 9913 Unknown, 0 Unchecked, 33.18ms Time], IncrementalHoareTripleChecker [152 Valid, 9761 Invalid, 0 Unknown, 0 Unchecked, 5793.26ms Time] [2021-11-13 17:35:33,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2088 states. [2021-11-13 17:35:33,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2088 to 1762. [2021-11-13 17:35:33,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1762 states, 1748 states have (on average 1.1493135011441649) internal successors, (2009), 1750 states have internal predecessors, (2009), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:33,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1762 states to 1762 states and 2020 transitions. [2021-11-13 17:35:33,535 INFO L78 Accepts]: Start accepts. Automaton has 1762 states and 2020 transitions. Word has length 101 [2021-11-13 17:35:33,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:35:33,535 INFO L470 AbstractCegarLoop]: Abstraction has 1762 states and 2020 transitions. [2021-11-13 17:35:33,536 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 71 states have (on average 3.6338028169014085) internal successors, (258), 70 states have internal predecessors, (258), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:33,536 INFO L276 IsEmpty]: Start isEmpty. Operand 1762 states and 2020 transitions. [2021-11-13 17:35:33,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-13 17:35:33,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:35:33,539 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:35:33,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-13 17:35:33,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:35:33,755 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:35:33,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:35:33,756 INFO L85 PathProgramCache]: Analyzing trace with hash 1067824875, now seen corresponding path program 13 times [2021-11-13 17:35:33,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:35:33,756 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740671475] [2021-11-13 17:35:33,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:35:33,756 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:35:33,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:34,094 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:35:34,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:34,098 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 15 proven. 157 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:35:34,098 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:35:34,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740671475] [2021-11-13 17:35:34,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740671475] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:35:34,098 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102242274] [2021-11-13 17:35:34,098 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:35:34,099 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:35:34,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:35:34,100 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:35:34,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-13 17:35:34,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:34,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-13 17:35:34,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:35:34,308 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:35:34,308 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:35:37,065 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 28 proven. 150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:35:37,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:35:38,975 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 45 proven. 133 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:35:38,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102242274] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:35:38,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:35:38,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22, 22] total 59 [2021-11-13 17:35:38,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317588799] [2021-11-13 17:35:38,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:35:38,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-13 17:35:38,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:35:38,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-13 17:35:38,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=3254, Unknown=0, NotChecked=0, Total=3540 [2021-11-13 17:35:38,977 INFO L87 Difference]: Start difference. First operand 1762 states and 2020 transitions. Second operand has 60 states, 59 states have (on average 4.762711864406779) internal successors, (281), 56 states have internal predecessors, (281), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:42,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:35:42,574 INFO L93 Difference]: Finished difference Result 1926 states and 2172 transitions. [2021-11-13 17:35:42,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-13 17:35:42,574 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 4.762711864406779) internal successors, (281), 56 states have internal predecessors, (281), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-11-13 17:35:42,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:35:42,577 INFO L225 Difference]: With dead ends: 1926 [2021-11-13 17:35:42,577 INFO L226 Difference]: Without dead ends: 1926 [2021-11-13 17:35:42,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 187 SyntacticMatches, 5 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3124 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=954, Invalid=11478, Unknown=0, NotChecked=0, Total=12432 [2021-11-13 17:35:42,578 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 628 mSDsluCounter, 708 mSDsCounter, 0 mSdLazyCounter, 2259 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1026.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 628 SdHoareTripleChecker+Valid, 784 SdHoareTripleChecker+Invalid, 3993 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.98ms SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 2259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1610 IncrementalHoareTripleChecker+Unchecked, 1244.44ms IncrementalHoareTripleChecker+Time [2021-11-13 17:35:42,578 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [628 Valid, 784 Invalid, 3993 Unknown, 0 Unchecked, 10.98ms Time], IncrementalHoareTripleChecker [124 Valid, 2259 Invalid, 0 Unknown, 1610 Unchecked, 1244.44ms Time] [2021-11-13 17:35:42,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1926 states. [2021-11-13 17:35:42,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1926 to 1811. [2021-11-13 17:35:42,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1811 states, 1797 states have (on average 1.1446855870895938) internal successors, (2057), 1799 states have internal predecessors, (2057), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1811 states to 1811 states and 2068 transitions. [2021-11-13 17:35:42,596 INFO L78 Accepts]: Start accepts. Automaton has 1811 states and 2068 transitions. Word has length 102 [2021-11-13 17:35:42,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:35:42,596 INFO L470 AbstractCegarLoop]: Abstraction has 1811 states and 2068 transitions. [2021-11-13 17:35:42,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 4.762711864406779) internal successors, (281), 56 states have internal predecessors, (281), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:42,597 INFO L276 IsEmpty]: Start isEmpty. Operand 1811 states and 2068 transitions. [2021-11-13 17:35:42,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-13 17:35:42,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:35:42,599 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:35:42,622 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-13 17:35:42,799 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:35:42,799 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:35:42,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:35:42,800 INFO L85 PathProgramCache]: Analyzing trace with hash 371245917, now seen corresponding path program 14 times [2021-11-13 17:35:42,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:35:42,800 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394783668] [2021-11-13 17:35:42,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:35:42,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:35:42,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:43,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:35:43,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:43,128 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 15 proven. 143 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:35:43,128 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:35:43,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394783668] [2021-11-13 17:35:43,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394783668] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:35:43,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045195793] [2021-11-13 17:35:43,128 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:35:43,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:35:43,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:35:43,132 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:35:43,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-13 17:35:43,318 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:35:43,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:35:43,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-13 17:35:43,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:35:43,872 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 28 proven. 130 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:35:43,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:35:44,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-13 17:35:44,497 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 28 proven. 130 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:35:44,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045195793] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:35:44,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:35:44,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 37 [2021-11-13 17:35:44,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060695001] [2021-11-13 17:35:44,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:35:44,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-13 17:35:44,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:35:44,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-13 17:35:44,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1267, Unknown=0, NotChecked=0, Total=1406 [2021-11-13 17:35:44,499 INFO L87 Difference]: Start difference. First operand 1811 states and 2068 transitions. Second operand has 38 states, 37 states have (on average 5.135135135135135) internal successors, (190), 34 states have internal predecessors, (190), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:46,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:35:46,237 INFO L93 Difference]: Finished difference Result 1959 states and 2203 transitions. [2021-11-13 17:35:46,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-13 17:35:46,238 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 5.135135135135135) internal successors, (190), 34 states have internal predecessors, (190), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-11-13 17:35:46,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:35:46,241 INFO L225 Difference]: With dead ends: 1959 [2021-11-13 17:35:46,241 INFO L226 Difference]: Without dead ends: 1959 [2021-11-13 17:35:46,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 921 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=530, Invalid=3630, Unknown=0, NotChecked=0, Total=4160 [2021-11-13 17:35:46,242 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 725 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 1455 mSolverCounterSat, 192 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 704.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 725 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 1647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.53ms SdHoareTripleChecker+Time, 192 IncrementalHoareTripleChecker+Valid, 1455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 845.13ms IncrementalHoareTripleChecker+Time [2021-11-13 17:35:46,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [725 Valid, 262 Invalid, 1647 Unknown, 0 Unchecked, 6.53ms Time], IncrementalHoareTripleChecker [192 Valid, 1455 Invalid, 0 Unknown, 0 Unchecked, 845.13ms Time] [2021-11-13 17:35:46,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1959 states. [2021-11-13 17:35:46,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1959 to 1811. [2021-11-13 17:35:46,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1811 states, 1797 states have (on average 1.1419031719532555) internal successors, (2052), 1799 states have internal predecessors, (2052), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:46,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1811 states to 1811 states and 2063 transitions. [2021-11-13 17:35:46,268 INFO L78 Accepts]: Start accepts. Automaton has 1811 states and 2063 transitions. Word has length 102 [2021-11-13 17:35:46,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:35:46,268 INFO L470 AbstractCegarLoop]: Abstraction has 1811 states and 2063 transitions. [2021-11-13 17:35:46,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 5.135135135135135) internal successors, (190), 34 states have internal predecessors, (190), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:35:46,269 INFO L276 IsEmpty]: Start isEmpty. Operand 1811 states and 2063 transitions. [2021-11-13 17:35:46,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-13 17:35:46,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:35:46,271 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:35:46,297 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-13 17:35:46,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-13 17:35:46,471 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:35:46,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:35:46,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1414202679, now seen corresponding path program 15 times [2021-11-13 17:35:46,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:35:46,472 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337127485] [2021-11-13 17:35:46,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:35:46,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:35:46,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:46,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:35:46,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:35:46,808 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 15 proven. 127 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:35:46,809 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:35:46,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337127485] [2021-11-13 17:35:46,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337127485] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:35:46,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689779085] [2021-11-13 17:35:46,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:35:46,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:35:46,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:35:46,815 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:35:46,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-13 17:35:47,050 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-13 17:35:47,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:35:47,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-13 17:35:47,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:35:47,086 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:35:47,086 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:35:47,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-13 17:35:47,881 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-13 17:35:47,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2021-11-13 17:35:50,582 INFO L354 Elim1Store]: treesize reduction 83, result has 41.1 percent of original size [2021-11-13 17:35:50,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 79 treesize of output 103 [2021-11-13 17:35:53,177 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-13 17:35:53,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:36:00,336 INFO L354 Elim1Store]: treesize reduction 23, result has 46.5 percent of original size [2021-11-13 17:36:00,336 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 2 case distinctions, treesize of input 248 treesize of output 197 [2021-11-13 17:36:00,348 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:36:00,348 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 193 treesize of output 185 [2021-11-13 17:36:00,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 17 [2021-11-13 17:36:00,513 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-13 17:36:00,544 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:36:00,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 83 treesize of output 106 [2021-11-13 17:36:13,044 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2021-11-13 17:36:13,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689779085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:36:13,044 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:36:13,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 21] total 57 [2021-11-13 17:36:13,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175990180] [2021-11-13 17:36:13,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:36:13,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-13 17:36:13,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:36:13,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-13 17:36:13,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=3012, Unknown=1, NotChecked=0, Total=3306 [2021-11-13 17:36:13,046 INFO L87 Difference]: Start difference. First operand 1811 states and 2063 transitions. Second operand has 58 states, 55 states have (on average 3.727272727272727) internal successors, (205), 54 states have internal predecessors, (205), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:32,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:36:32,686 INFO L93 Difference]: Finished difference Result 1980 states and 2250 transitions. [2021-11-13 17:36:32,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-11-13 17:36:32,687 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 55 states have (on average 3.727272727272727) internal successors, (205), 54 states have internal predecessors, (205), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-11-13 17:36:32,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:36:32,689 INFO L225 Difference]: With dead ends: 1980 [2021-11-13 17:36:32,689 INFO L226 Difference]: Without dead ends: 1980 [2021-11-13 17:36:32,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 174 SyntacticMatches, 9 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6315 ImplicationChecksByTransitivity, 24.9s TimeCoverageRelationStatistics Valid=2056, Invalid=20592, Unknown=2, NotChecked=0, Total=22650 [2021-11-13 17:36:32,691 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 113 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 190.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 1008 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.33ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 612 IncrementalHoareTripleChecker+Unchecked, 229.58ms IncrementalHoareTripleChecker+Time [2021-11-13 17:36:32,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 592 Invalid, 1008 Unknown, 0 Unchecked, 3.33ms Time], IncrementalHoareTripleChecker [5 Valid, 391 Invalid, 0 Unknown, 612 Unchecked, 229.58ms Time] [2021-11-13 17:36:32,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1980 states. [2021-11-13 17:36:32,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1980 to 1891. [2021-11-13 17:36:32,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1891 states, 1877 states have (on average 1.141715503462973) internal successors, (2143), 1879 states have internal predecessors, (2143), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:32,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1891 states to 1891 states and 2154 transitions. [2021-11-13 17:36:32,712 INFO L78 Accepts]: Start accepts. Automaton has 1891 states and 2154 transitions. Word has length 102 [2021-11-13 17:36:32,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:36:32,713 INFO L470 AbstractCegarLoop]: Abstraction has 1891 states and 2154 transitions. [2021-11-13 17:36:32,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 55 states have (on average 3.727272727272727) internal successors, (205), 54 states have internal predecessors, (205), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:32,713 INFO L276 IsEmpty]: Start isEmpty. Operand 1891 states and 2154 transitions. [2021-11-13 17:36:32,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-13 17:36:32,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:36:32,715 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:36:32,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-13 17:36:32,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-13 17:36:32,916 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:36:32,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:36:32,916 INFO L85 PathProgramCache]: Analyzing trace with hash -558025274, now seen corresponding path program 16 times [2021-11-13 17:36:32,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:36:32,916 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320005747] [2021-11-13 17:36:32,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:36:32,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:36:32,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:36:33,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:36:33,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:36:33,385 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 30 proven. 134 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:36:33,385 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:36:33,385 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320005747] [2021-11-13 17:36:33,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320005747] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:36:33,385 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753714086] [2021-11-13 17:36:33,385 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:36:33,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:36:33,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:36:33,386 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:36:33,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-13 17:36:33,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:36:33,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:36:33,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-13 17:36:33,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:36:33,560 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:36:33,560 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:36:33,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:36:34,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-13 17:36:34,306 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-13 17:36:34,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-13 17:36:36,543 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 17:36:36,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 63 [2021-11-13 17:36:36,586 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-13 17:36:36,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 62 [2021-11-13 17:36:36,663 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 69 proven. 95 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:36:36,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:36:40,927 INFO L354 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2021-11-13 17:36:40,928 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 380 treesize of output 344 [2021-11-13 17:36:41,910 INFO L134 CoverageAnalysis]: Checked inductivity of 199 backedges. 59 proven. 105 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:36:41,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753714086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:36:41,911 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:36:41,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 63 [2021-11-13 17:36:41,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984240070] [2021-11-13 17:36:41,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:36:41,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-13 17:36:41,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:36:41,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-13 17:36:41,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=3661, Unknown=1, NotChecked=0, Total=3906 [2021-11-13 17:36:41,912 INFO L87 Difference]: Start difference. First operand 1891 states and 2154 transitions. Second operand has 63 states, 61 states have (on average 3.721311475409836) internal successors, (227), 59 states have internal predecessors, (227), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:54,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:36:54,056 INFO L93 Difference]: Finished difference Result 1966 states and 2227 transitions. [2021-11-13 17:36:54,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-13 17:36:54,057 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 61 states have (on average 3.721311475409836) internal successors, (227), 59 states have internal predecessors, (227), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-11-13 17:36:54,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:36:54,059 INFO L225 Difference]: With dead ends: 1966 [2021-11-13 17:36:54,059 INFO L226 Difference]: Without dead ends: 1641 [2021-11-13 17:36:54,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1637 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=658, Invalid=8653, Unknown=1, NotChecked=0, Total=9312 [2021-11-13 17:36:54,060 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 184 mSDsluCounter, 470 mSDsCounter, 0 mSdLazyCounter, 2014 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 800.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 3521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.55ms SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 2014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1484 IncrementalHoareTripleChecker+Unchecked, 971.52ms IncrementalHoareTripleChecker+Time [2021-11-13 17:36:54,060 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 527 Invalid, 3521 Unknown, 0 Unchecked, 7.55ms Time], IncrementalHoareTripleChecker [23 Valid, 2014 Invalid, 0 Unknown, 1484 Unchecked, 971.52ms Time] [2021-11-13 17:36:54,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1641 states. [2021-11-13 17:36:54,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1641 to 1641. [2021-11-13 17:36:54,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1641 states, 1629 states have (on average 1.1522406384284838) internal successors, (1877), 1631 states have internal predecessors, (1877), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:54,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1641 states to 1641 states and 1886 transitions. [2021-11-13 17:36:54,085 INFO L78 Accepts]: Start accepts. Automaton has 1641 states and 1886 transitions. Word has length 105 [2021-11-13 17:36:54,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:36:54,086 INFO L470 AbstractCegarLoop]: Abstraction has 1641 states and 1886 transitions. [2021-11-13 17:36:54,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 61 states have (on average 3.721311475409836) internal successors, (227), 59 states have internal predecessors, (227), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:54,086 INFO L276 IsEmpty]: Start isEmpty. Operand 1641 states and 1886 transitions. [2021-11-13 17:36:54,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-13 17:36:54,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:36:54,089 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:36:54,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-13 17:36:54,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:36:54,303 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:36:54,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:36:54,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1220831128, now seen corresponding path program 17 times [2021-11-13 17:36:54,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:36:54,304 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542274710] [2021-11-13 17:36:54,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:36:54,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:36:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:36:54,600 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:36:54,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:36:54,603 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 15 proven. 160 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:36:54,603 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:36:54,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542274710] [2021-11-13 17:36:54,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542274710] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:36:54,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [80540280] [2021-11-13 17:36:54,603 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:36:54,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:36:54,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:36:54,605 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:36:54,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-13 17:36:54,767 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-13 17:36:54,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:36:54,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-13 17:36:54,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:36:54,803 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:36:54,803 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:36:54,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:36:55,640 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 28 proven. 147 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:36:55,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:36:56,665 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 45 proven. 130 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:36:56,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [80540280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:36:56,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:36:56,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 42 [2021-11-13 17:36:56,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466220715] [2021-11-13 17:36:56,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:36:56,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-13 17:36:56,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:36:56,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-13 17:36:56,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2021-11-13 17:36:56,667 INFO L87 Difference]: Start difference. First operand 1641 states and 1886 transitions. Second operand has 43 states, 42 states have (on average 5.404761904761905) internal successors, (227), 40 states have internal predecessors, (227), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:58,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:36:58,468 INFO L93 Difference]: Finished difference Result 1758 states and 1999 transitions. [2021-11-13 17:36:58,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-13 17:36:58,469 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 5.404761904761905) internal successors, (227), 40 states have internal predecessors, (227), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-11-13 17:36:58,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:36:58,471 INFO L225 Difference]: With dead ends: 1758 [2021-11-13 17:36:58,472 INFO L226 Difference]: Without dead ends: 1758 [2021-11-13 17:36:58,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 184 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1001 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=560, Invalid=4132, Unknown=0, NotChecked=0, Total=4692 [2021-11-13 17:36:58,472 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 382 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 1845 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 752.95ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 1951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.46ms SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 1845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 901.83ms IncrementalHoareTripleChecker+Time [2021-11-13 17:36:58,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 283 Invalid, 1951 Unknown, 0 Unchecked, 6.46ms Time], IncrementalHoareTripleChecker [106 Valid, 1845 Invalid, 0 Unknown, 0 Unchecked, 901.83ms Time] [2021-11-13 17:36:58,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1758 states. [2021-11-13 17:36:58,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1758 to 1619. [2021-11-13 17:36:58,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1619 states, 1607 states have (on average 1.151213441194773) internal successors, (1850), 1609 states have internal predecessors, (1850), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:58,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1619 states to 1619 states and 1859 transitions. [2021-11-13 17:36:58,497 INFO L78 Accepts]: Start accepts. Automaton has 1619 states and 1859 transitions. Word has length 105 [2021-11-13 17:36:58,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:36:58,497 INFO L470 AbstractCegarLoop]: Abstraction has 1619 states and 1859 transitions. [2021-11-13 17:36:58,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 5.404761904761905) internal successors, (227), 40 states have internal predecessors, (227), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:36:58,498 INFO L276 IsEmpty]: Start isEmpty. Operand 1619 states and 1859 transitions. [2021-11-13 17:36:58,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-13 17:36:58,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:36:58,501 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:36:58,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-13 17:36:58,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:36:58,716 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:36:58,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:36:58,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1454733793, now seen corresponding path program 9 times [2021-11-13 17:36:58,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:36:58,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69172912] [2021-11-13 17:36:58,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:36:58,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:36:58,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:36:59,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:36:59,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:36:59,139 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 51 proven. 165 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:36:59,139 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:36:59,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69172912] [2021-11-13 17:36:59,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69172912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:36:59,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250051655] [2021-11-13 17:36:59,139 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:36:59,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:36:59,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:36:59,141 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:36:59,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-13 17:36:59,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-13 17:36:59,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:36:59,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-13 17:36:59,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:36:59,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:36:59,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 17:36:59,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-13 17:36:59,950 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-13 17:36:59,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-13 17:37:01,570 INFO L354 Elim1Store]: treesize reduction 39, result has 26.4 percent of original size [2021-11-13 17:37:01,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 36 [2021-11-13 17:37:01,719 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 141 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:37:01,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:37:04,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 54 [2021-11-13 17:37:05,361 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 136 proven. 80 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:37:05,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250051655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:37:05,361 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:37:05,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 56 [2021-11-13 17:37:05,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76395073] [2021-11-13 17:37:05,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:37:05,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-13 17:37:05,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:37:05,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-13 17:37:05,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=2843, Unknown=1, NotChecked=0, Total=3080 [2021-11-13 17:37:05,363 INFO L87 Difference]: Start difference. First operand 1619 states and 1859 transitions. Second operand has 56 states, 54 states have (on average 5.37037037037037) internal successors, (290), 52 states have internal predecessors, (290), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:06,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:37:06,709 INFO L93 Difference]: Finished difference Result 2667 states and 3037 transitions. [2021-11-13 17:37:06,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-13 17:37:06,710 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 54 states have (on average 5.37037037037037) internal successors, (290), 52 states have internal predecessors, (290), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-11-13 17:37:06,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:37:06,713 INFO L225 Difference]: With dead ends: 2667 [2021-11-13 17:37:06,713 INFO L226 Difference]: Without dead ends: 2558 [2021-11-13 17:37:06,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 692 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=441, Invalid=4960, Unknown=1, NotChecked=0, Total=5402 [2021-11-13 17:37:06,714 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 97 mSDsluCounter, 1069 mSDsCounter, 0 mSdLazyCounter, 1030 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 398.74ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1121 SdHoareTripleChecker+Invalid, 1377 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.50ms SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1030 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 334 IncrementalHoareTripleChecker+Unchecked, 496.35ms IncrementalHoareTripleChecker+Time [2021-11-13 17:37:06,714 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 1121 Invalid, 1377 Unknown, 0 Unchecked, 4.50ms Time], IncrementalHoareTripleChecker [13 Valid, 1030 Invalid, 0 Unknown, 334 Unchecked, 496.35ms Time] [2021-11-13 17:37:06,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2558 states. [2021-11-13 17:37:06,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2558 to 2496. [2021-11-13 17:37:06,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2496 states, 2480 states have (on average 1.1399193548387097) internal successors, (2827), 2482 states have internal predecessors, (2827), 12 states have call successors, (12), 12 states have call predecessors, (12), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:06,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2496 states to 2496 states and 2840 transitions. [2021-11-13 17:37:06,738 INFO L78 Accepts]: Start accepts. Automaton has 2496 states and 2840 transitions. Word has length 107 [2021-11-13 17:37:06,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:37:06,739 INFO L470 AbstractCegarLoop]: Abstraction has 2496 states and 2840 transitions. [2021-11-13 17:37:06,739 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 54 states have (on average 5.37037037037037) internal successors, (290), 52 states have internal predecessors, (290), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:06,739 INFO L276 IsEmpty]: Start isEmpty. Operand 2496 states and 2840 transitions. [2021-11-13 17:37:06,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-13 17:37:06,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:37:06,742 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:37:06,766 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-13 17:37:06,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-13 17:37:06,942 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:37:06,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:37:06,950 INFO L85 PathProgramCache]: Analyzing trace with hash 2967242, now seen corresponding path program 4 times [2021-11-13 17:37:06,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:37:06,951 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171352296] [2021-11-13 17:37:06,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:37:06,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:37:06,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:08,561 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:37:08,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:08,564 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 7 proven. 215 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 17:37:08,564 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:37:08,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171352296] [2021-11-13 17:37:08,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171352296] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:37:08,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737667649] [2021-11-13 17:37:08,565 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:37:08,565 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:08,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:37:08,566 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:37:08,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-13 17:37:08,684 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:37:08,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:37:08,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-13 17:37:08,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:37:08,713 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:37:08,714 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:37:09,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:37:10,079 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-13 17:37:10,079 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 34 treesize of output 25 [2021-11-13 17:37:10,132 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 77 proven. 98 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-13 17:37:10,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:37:11,284 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 24 treesize of output 22 [2021-11-13 17:37:11,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-13 17:37:12,394 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 70 proven. 105 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-13 17:37:12,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737667649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:37:12,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:37:12,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 20, 20] total 67 [2021-11-13 17:37:12,394 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296929838] [2021-11-13 17:37:12,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:37:12,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-13 17:37:12,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:37:12,395 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-13 17:37:12,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=4170, Unknown=0, NotChecked=0, Total=4422 [2021-11-13 17:37:12,395 INFO L87 Difference]: Start difference. First operand 2496 states and 2840 transitions. Second operand has 67 states, 64 states have (on average 3.796875) internal successors, (243), 63 states have internal predecessors, (243), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:21,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:37:21,231 INFO L93 Difference]: Finished difference Result 2842 states and 3163 transitions. [2021-11-13 17:37:21,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-13 17:37:21,231 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 64 states have (on average 3.796875) internal successors, (243), 63 states have internal predecessors, (243), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 108 [2021-11-13 17:37:21,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:37:21,234 INFO L225 Difference]: With dead ends: 2842 [2021-11-13 17:37:21,234 INFO L226 Difference]: Without dead ends: 2813 [2021-11-13 17:37:21,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4988 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1820, Invalid=19642, Unknown=0, NotChecked=0, Total=21462 [2021-11-13 17:37:21,237 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 589 mSDsluCounter, 656 mSDsCounter, 0 mSdLazyCounter, 7250 mSolverCounterSat, 122 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3313.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 589 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 8408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 21.56ms SdHoareTripleChecker+Time, 122 IncrementalHoareTripleChecker+Valid, 7250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1036 IncrementalHoareTripleChecker+Unchecked, 3927.34ms IncrementalHoareTripleChecker+Time [2021-11-13 17:37:21,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [589 Valid, 725 Invalid, 8408 Unknown, 0 Unchecked, 21.56ms Time], IncrementalHoareTripleChecker [122 Valid, 7250 Invalid, 0 Unknown, 1036 Unchecked, 3927.34ms Time] [2021-11-13 17:37:21,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2813 states. [2021-11-13 17:37:21,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2813 to 2231. [2021-11-13 17:37:21,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2231 states, 2215 states have (on average 1.1313769751693001) internal successors, (2506), 2217 states have internal predecessors, (2506), 12 states have call successors, (12), 12 states have call predecessors, (12), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:21,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2231 states to 2231 states and 2519 transitions. [2021-11-13 17:37:21,270 INFO L78 Accepts]: Start accepts. Automaton has 2231 states and 2519 transitions. Word has length 108 [2021-11-13 17:37:21,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:37:21,270 INFO L470 AbstractCegarLoop]: Abstraction has 2231 states and 2519 transitions. [2021-11-13 17:37:21,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 64 states have (on average 3.796875) internal successors, (243), 63 states have internal predecessors, (243), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:21,271 INFO L276 IsEmpty]: Start isEmpty. Operand 2231 states and 2519 transitions. [2021-11-13 17:37:21,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-13 17:37:21,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:37:21,274 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:37:21,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-13 17:37:21,487 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-13 17:37:21,487 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:37:21,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:37:21,488 INFO L85 PathProgramCache]: Analyzing trace with hash 574588323, now seen corresponding path program 18 times [2021-11-13 17:37:21,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:37:21,488 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872708442] [2021-11-13 17:37:21,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:37:21,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:37:21,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:21,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:37:21,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:21,808 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 15 proven. 190 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:37:21,808 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:37:21,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872708442] [2021-11-13 17:37:21,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872708442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:37:21,808 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377714060] [2021-11-13 17:37:21,808 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:37:21,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:21,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:37:21,812 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:37:21,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-13 17:37:22,061 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-13 17:37:22,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:37:22,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-13 17:37:22,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:37:22,894 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 28 proven. 184 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-13 17:37:22,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:37:23,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:37:23,834 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 28 proven. 177 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:37:23,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377714060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:37:23,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:37:23,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 17] total 44 [2021-11-13 17:37:23,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382983444] [2021-11-13 17:37:23,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:37:23,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-13 17:37:23,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:37:23,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-13 17:37:23,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1781, Unknown=0, NotChecked=0, Total=1980 [2021-11-13 17:37:23,836 INFO L87 Difference]: Start difference. First operand 2231 states and 2519 transitions. Second operand has 45 states, 44 states have (on average 5.840909090909091) internal successors, (257), 41 states have internal predecessors, (257), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:26,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:37:26,310 INFO L93 Difference]: Finished difference Result 2514 states and 2791 transitions. [2021-11-13 17:37:26,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-13 17:37:26,311 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 5.840909090909091) internal successors, (257), 41 states have internal predecessors, (257), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-11-13 17:37:26,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:37:26,315 INFO L225 Difference]: With dead ends: 2514 [2021-11-13 17:37:26,315 INFO L226 Difference]: Without dead ends: 2379 [2021-11-13 17:37:26,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 191 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=743, Invalid=4807, Unknown=0, NotChecked=0, Total=5550 [2021-11-13 17:37:26,316 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 953 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 1938 mSolverCounterSat, 279 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 879.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 953 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 2217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.96ms SdHoareTripleChecker+Time, 279 IncrementalHoareTripleChecker+Valid, 1938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1053.80ms IncrementalHoareTripleChecker+Time [2021-11-13 17:37:26,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [953 Valid, 243 Invalid, 2217 Unknown, 0 Unchecked, 7.96ms Time], IncrementalHoareTripleChecker [279 Valid, 1938 Invalid, 0 Unknown, 0 Unchecked, 1053.80ms Time] [2021-11-13 17:37:26,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2379 states. [2021-11-13 17:37:26,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2379 to 2071. [2021-11-13 17:37:26,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2071 states, 2056 states have (on average 1.1357003891050583) internal successors, (2335), 2058 states have internal predecessors, (2335), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:26,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2071 states to 2071 states and 2347 transitions. [2021-11-13 17:37:26,348 INFO L78 Accepts]: Start accepts. Automaton has 2071 states and 2347 transitions. Word has length 109 [2021-11-13 17:37:26,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:37:26,349 INFO L470 AbstractCegarLoop]: Abstraction has 2071 states and 2347 transitions. [2021-11-13 17:37:26,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 5.840909090909091) internal successors, (257), 41 states have internal predecessors, (257), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:26,349 INFO L276 IsEmpty]: Start isEmpty. Operand 2071 states and 2347 transitions. [2021-11-13 17:37:26,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-13 17:37:26,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:37:26,353 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:37:26,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-13 17:37:26,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-13 17:37:26,567 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:37:26,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:37:26,568 INFO L85 PathProgramCache]: Analyzing trace with hash -1330540471, now seen corresponding path program 19 times [2021-11-13 17:37:26,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:37:26,568 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790575091] [2021-11-13 17:37:26,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:37:26,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:37:26,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:26,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:37:26,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:26,880 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 15 proven. 166 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:37:26,880 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:37:26,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790575091] [2021-11-13 17:37:26,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790575091] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:37:26,881 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881956187] [2021-11-13 17:37:26,881 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:37:26,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:26,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:37:26,888 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:37:26,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-13 17:37:27,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:27,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-13 17:37:27,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:37:27,083 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:37:27,084 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:37:27,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:37:28,072 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 28 proven. 153 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:37:28,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:37:29,076 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 45 proven. 136 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:37:29,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881956187] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:37:29,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:37:29,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 46 [2021-11-13 17:37:29,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782580394] [2021-11-13 17:37:29,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:37:29,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-13 17:37:29,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:37:29,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-13 17:37:29,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1970, Unknown=0, NotChecked=0, Total=2162 [2021-11-13 17:37:29,078 INFO L87 Difference]: Start difference. First operand 2071 states and 2347 transitions. Second operand has 47 states, 46 states have (on average 5.282608695652174) internal successors, (243), 43 states have internal predecessors, (243), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:31,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:37:31,221 INFO L93 Difference]: Finished difference Result 2308 states and 2574 transitions. [2021-11-13 17:37:31,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-13 17:37:31,222 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 5.282608695652174) internal successors, (243), 43 states have internal predecessors, (243), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-11-13 17:37:31,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:37:31,227 INFO L225 Difference]: With dead ends: 2308 [2021-11-13 17:37:31,227 INFO L226 Difference]: Without dead ends: 2308 [2021-11-13 17:37:31,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=659, Invalid=5347, Unknown=0, NotChecked=0, Total=6006 [2021-11-13 17:37:31,228 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 639 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 1954 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 893.32ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 639 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 2108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.56ms SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 1954 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1063.85ms IncrementalHoareTripleChecker+Time [2021-11-13 17:37:31,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [639 Valid, 298 Invalid, 2108 Unknown, 0 Unchecked, 7.56ms Time], IncrementalHoareTripleChecker [154 Valid, 1954 Invalid, 0 Unknown, 0 Unchecked, 1063.85ms Time] [2021-11-13 17:37:31,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2308 states. [2021-11-13 17:37:31,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2308 to 1888. [2021-11-13 17:37:31,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1888 states, 1873 states have (on average 1.1366791243993593) internal successors, (2129), 1875 states have internal predecessors, (2129), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:31,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1888 states to 1888 states and 2141 transitions. [2021-11-13 17:37:31,272 INFO L78 Accepts]: Start accepts. Automaton has 1888 states and 2141 transitions. Word has length 109 [2021-11-13 17:37:31,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:37:31,273 INFO L470 AbstractCegarLoop]: Abstraction has 1888 states and 2141 transitions. [2021-11-13 17:37:31,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 5.282608695652174) internal successors, (243), 43 states have internal predecessors, (243), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:31,273 INFO L276 IsEmpty]: Start isEmpty. Operand 1888 states and 2141 transitions. [2021-11-13 17:37:31,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-13 17:37:31,276 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:37:31,276 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:37:31,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-13 17:37:31,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:31,503 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting substringErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:37:31,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:37:31,504 INFO L85 PathProgramCache]: Analyzing trace with hash -812495902, now seen corresponding path program 10 times [2021-11-13 17:37:31,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:37:31,504 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1083848213] [2021-11-13 17:37:31,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:37:31,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:37:31,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:31,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:37:31,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:31,862 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 28 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-13 17:37:31,862 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:37:31,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1083848213] [2021-11-13 17:37:31,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1083848213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:37:31,862 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56505655] [2021-11-13 17:37:31,862 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:37:31,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:31,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:37:31,868 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:37:31,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-13 17:37:32,042 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:37:32,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:37:32,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-13 17:37:32,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:37:32,078 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:37:32,079 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:37:32,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-13 17:37:32,698 INFO L354 Elim1Store]: treesize reduction 41, result has 18.0 percent of original size [2021-11-13 17:37:32,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2021-11-13 17:37:38,387 INFO L354 Elim1Store]: treesize reduction 18, result has 61.7 percent of original size [2021-11-13 17:37:38,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 43 treesize of output 52 [2021-11-13 17:37:38,762 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 115 proven. 57 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-13 17:37:38,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:37:41,705 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 31 treesize of output 29 [2021-11-13 17:37:41,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 35 [2021-11-13 17:37:42,433 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 106 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-13 17:37:42,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56505655] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:37:42,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:37:42,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 18] total 53 [2021-11-13 17:37:42,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408017184] [2021-11-13 17:37:42,434 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:37:42,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-13 17:37:42,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:37:42,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-13 17:37:42,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2605, Unknown=1, NotChecked=0, Total=2862 [2021-11-13 17:37:42,435 INFO L87 Difference]: Start difference. First operand 1888 states and 2141 transitions. Second operand has 54 states, 52 states have (on average 5.230769230769231) internal successors, (272), 50 states have internal predecessors, (272), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:46,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:37:46,354 INFO L93 Difference]: Finished difference Result 2030 states and 2307 transitions. [2021-11-13 17:37:46,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-13 17:37:46,354 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 52 states have (on average 5.230769230769231) internal successors, (272), 50 states have internal predecessors, (272), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-11-13 17:37:46,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:37:46,357 INFO L225 Difference]: With dead ends: 2030 [2021-11-13 17:37:46,357 INFO L226 Difference]: Without dead ends: 1953 [2021-11-13 17:37:46,358 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 221 SyntacticMatches, 17 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=989, Invalid=8130, Unknown=1, NotChecked=0, Total=9120 [2021-11-13 17:37:46,358 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 447 mSDsluCounter, 1320 mSDsCounter, 0 mSdLazyCounter, 717 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 313.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 447 SdHoareTripleChecker+Valid, 1369 SdHoareTripleChecker+Invalid, 1259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.98ms SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 517 IncrementalHoareTripleChecker+Unchecked, 371.90ms IncrementalHoareTripleChecker+Time [2021-11-13 17:37:46,358 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [447 Valid, 1369 Invalid, 1259 Unknown, 0 Unchecked, 4.98ms Time], IncrementalHoareTripleChecker [25 Valid, 717 Invalid, 0 Unknown, 517 Unchecked, 371.90ms Time] [2021-11-13 17:37:46,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1953 states. [2021-11-13 17:37:46,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1953 to 1732. [2021-11-13 17:37:46,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1732 states, 1719 states have (on average 1.1337987201861548) internal successors, (1949), 1720 states have internal predecessors, (1949), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:46,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1732 states to 1732 states and 1960 transitions. [2021-11-13 17:37:46,379 INFO L78 Accepts]: Start accepts. Automaton has 1732 states and 1960 transitions. Word has length 111 [2021-11-13 17:37:46,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:37:46,379 INFO L470 AbstractCegarLoop]: Abstraction has 1732 states and 1960 transitions. [2021-11-13 17:37:46,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 52 states have (on average 5.230769230769231) internal successors, (272), 50 states have internal predecessors, (272), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:46,380 INFO L276 IsEmpty]: Start isEmpty. Operand 1732 states and 1960 transitions. [2021-11-13 17:37:46,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-13 17:37:46,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:37:46,382 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:37:46,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-13 17:37:46,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:46,583 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:37:46,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:37:46,584 INFO L85 PathProgramCache]: Analyzing trace with hash -858982096, now seen corresponding path program 20 times [2021-11-13 17:37:46,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:37:46,584 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128451500] [2021-11-13 17:37:46,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:37:46,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:37:46,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:47,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:37:47,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:47,159 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 30 proven. 182 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:37:47,160 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:37:47,160 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128451500] [2021-11-13 17:37:47,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128451500] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:37:47,160 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [484835039] [2021-11-13 17:37:47,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:37:47,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:47,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:37:47,161 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:37:47,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-13 17:37:47,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:37:47,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:37:47,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-13 17:37:47,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:37:47,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:37:47,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:37:47,803 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:37:47,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:37:49,881 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-13 17:37:49,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 56 [2021-11-13 17:37:49,947 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 30 proven. 182 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:37:49,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:37:56,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:37:56,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:37:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 30 proven. 182 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-13 17:37:57,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [484835039] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:37:57,192 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:37:57,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 25] total 61 [2021-11-13 17:37:57,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854001151] [2021-11-13 17:37:57,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:37:57,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-13 17:37:57,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:37:57,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-13 17:37:57,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=3469, Unknown=0, NotChecked=0, Total=3660 [2021-11-13 17:37:57,193 INFO L87 Difference]: Start difference. First operand 1732 states and 1960 transitions. Second operand has 61 states, 60 states have (on average 3.933333333333333) internal successors, (236), 57 states have internal predecessors, (236), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:58,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:37:58,083 INFO L93 Difference]: Finished difference Result 1684 states and 1892 transitions. [2021-11-13 17:37:58,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 17:37:58,083 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 3.933333333333333) internal successors, (236), 57 states have internal predecessors, (236), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-11-13 17:37:58,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:37:58,085 INFO L225 Difference]: With dead ends: 1684 [2021-11-13 17:37:58,085 INFO L226 Difference]: Without dead ends: 1506 [2021-11-13 17:37:58,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 191 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 932 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=280, Invalid=4832, Unknown=0, NotChecked=0, Total=5112 [2021-11-13 17:37:58,087 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 97 mSDsluCounter, 1311 mSDsCounter, 0 mSdLazyCounter, 1079 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 364.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 1369 SdHoareTripleChecker+Invalid, 1536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.34ms SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1079 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 440 IncrementalHoareTripleChecker+Unchecked, 442.22ms IncrementalHoareTripleChecker+Time [2021-11-13 17:37:58,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 1369 Invalid, 1536 Unknown, 0 Unchecked, 4.34ms Time], IncrementalHoareTripleChecker [17 Valid, 1079 Invalid, 0 Unknown, 440 Unchecked, 442.22ms Time] [2021-11-13 17:37:58,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1506 states. [2021-11-13 17:37:58,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1506 to 1489. [2021-11-13 17:37:58,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1489 states, 1477 states have (on average 1.1320243737305349) internal successors, (1672), 1478 states have internal predecessors, (1672), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:58,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1489 states to 1489 states and 1682 transitions. [2021-11-13 17:37:58,109 INFO L78 Accepts]: Start accepts. Automaton has 1489 states and 1682 transitions. Word has length 113 [2021-11-13 17:37:58,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:37:58,109 INFO L470 AbstractCegarLoop]: Abstraction has 1489 states and 1682 transitions. [2021-11-13 17:37:58,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 3.933333333333333) internal successors, (236), 57 states have internal predecessors, (236), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:37:58,109 INFO L276 IsEmpty]: Start isEmpty. Operand 1489 states and 1682 transitions. [2021-11-13 17:37:58,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-13 17:37:58,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:37:58,112 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:37:58,155 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-13 17:37:58,339 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:58,339 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:37:58,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:37:58,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1772984194, now seen corresponding path program 21 times [2021-11-13 17:37:58,340 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:37:58,340 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546597865] [2021-11-13 17:37:58,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:37:58,340 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:37:58,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:59,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:37:59,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:37:59,867 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 30 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:37:59,868 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:37:59,868 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546597865] [2021-11-13 17:37:59,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546597865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:37:59,868 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512129791] [2021-11-13 17:37:59,868 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:37:59,868 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:37:59,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:37:59,869 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:37:59,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-13 17:38:00,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-13 17:38:00,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:38:00,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-13 17:38:00,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:38:00,077 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:38:00,078 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:38:00,694 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 34 treesize of output 30 [2021-11-13 17:38:00,860 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-13 17:38:00,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 51 [2021-11-13 17:38:05,346 INFO L354 Elim1Store]: treesize reduction 1, result has 97.7 percent of original size [2021-11-13 17:38:05,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 61 [2021-11-13 17:38:05,588 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 8 proven. 121 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-11-13 17:38:05,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:38:08,872 INFO L354 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2021-11-13 17:38:08,872 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 385 treesize of output 349 [2021-11-13 17:38:10,137 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-13 17:38:10,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512129791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:38:10,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:38:10,137 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 15, 14] total 61 [2021-11-13 17:38:10,137 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695317680] [2021-11-13 17:38:10,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:38:10,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-13 17:38:10,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:38:10,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-13 17:38:10,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=3492, Unknown=0, NotChecked=0, Total=3660 [2021-11-13 17:38:10,139 INFO L87 Difference]: Start difference. First operand 1489 states and 1682 transitions. Second operand has 61 states, 58 states have (on average 3.6724137931034484) internal successors, (213), 57 states have internal predecessors, (213), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:18,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:38:18,243 INFO L93 Difference]: Finished difference Result 2379 states and 2653 transitions. [2021-11-13 17:38:18,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-13 17:38:18,243 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 58 states have (on average 3.6724137931034484) internal successors, (213), 57 states have internal predecessors, (213), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-11-13 17:38:18,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:38:18,245 INFO L225 Difference]: With dead ends: 2379 [2021-11-13 17:38:18,245 INFO L226 Difference]: Without dead ends: 2317 [2021-11-13 17:38:18,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 200 SyntacticMatches, 2 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4084 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=1080, Invalid=18942, Unknown=0, NotChecked=0, Total=20022 [2021-11-13 17:38:18,247 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 72 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 1177 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 653.70ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 1547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.81ms SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 349 IncrementalHoareTripleChecker+Unchecked, 773.17ms IncrementalHoareTripleChecker+Time [2021-11-13 17:38:18,247 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 580 Invalid, 1547 Unknown, 0 Unchecked, 4.81ms Time], IncrementalHoareTripleChecker [21 Valid, 1177 Invalid, 0 Unknown, 349 Unchecked, 773.17ms Time] [2021-11-13 17:38:18,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2317 states. [2021-11-13 17:38:18,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2317 to 2038. [2021-11-13 17:38:18,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2038 states, 2026 states have (on average 1.125370187561698) internal successors, (2280), 2027 states have internal predecessors, (2280), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:18,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2038 states to 2038 states and 2290 transitions. [2021-11-13 17:38:18,271 INFO L78 Accepts]: Start accepts. Automaton has 2038 states and 2290 transitions. Word has length 113 [2021-11-13 17:38:18,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:38:18,271 INFO L470 AbstractCegarLoop]: Abstraction has 2038 states and 2290 transitions. [2021-11-13 17:38:18,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 58 states have (on average 3.6724137931034484) internal successors, (213), 57 states have internal predecessors, (213), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:18,272 INFO L276 IsEmpty]: Start isEmpty. Operand 2038 states and 2290 transitions. [2021-11-13 17:38:18,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-13 17:38:18,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:38:18,274 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:38:18,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-13 17:38:18,475 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2021-11-13 17:38:18,475 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:38:18,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:38:18,475 INFO L85 PathProgramCache]: Analyzing trace with hash 1300800755, now seen corresponding path program 12 times [2021-11-13 17:38:18,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:38:18,476 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222314310] [2021-11-13 17:38:18,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:38:18,478 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:38:18,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:38:18,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:38:18,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:38:18,851 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 161 proven. 109 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:38:18,851 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:38:18,851 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222314310] [2021-11-13 17:38:18,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222314310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:38:18,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316650953] [2021-11-13 17:38:18,852 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:38:18,852 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:38:18,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:38:18,853 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:38:18,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-13 17:38:19,449 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-13 17:38:19,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:38:19,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-13 17:38:19,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:38:19,483 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:38:19,483 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:38:20,427 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 204 proven. 66 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:38:20,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:38:21,175 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 204 proven. 66 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-13 17:38:21,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316650953] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:38:21,175 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:38:21,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 21] total 54 [2021-11-13 17:38:21,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817388149] [2021-11-13 17:38:21,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:38:21,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-13 17:38:21,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:38:21,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-13 17:38:21,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=2432, Unknown=0, NotChecked=0, Total=2862 [2021-11-13 17:38:21,177 INFO L87 Difference]: Start difference. First operand 2038 states and 2290 transitions. Second operand has 54 states, 53 states have (on average 4.490566037735849) internal successors, (238), 50 states have internal predecessors, (238), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:22,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:38:22,423 INFO L93 Difference]: Finished difference Result 3324 states and 3680 transitions. [2021-11-13 17:38:22,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-13 17:38:22,424 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 4.490566037735849) internal successors, (238), 50 states have internal predecessors, (238), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-11-13 17:38:22,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:38:22,427 INFO L225 Difference]: With dead ends: 3324 [2021-11-13 17:38:22,427 INFO L226 Difference]: Without dead ends: 3253 [2021-11-13 17:38:22,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 208 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1785 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=767, Invalid=4063, Unknown=0, NotChecked=0, Total=4830 [2021-11-13 17:38:22,428 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 335 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 1654 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 718.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 1695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.37ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 866.31ms IncrementalHoareTripleChecker+Time [2021-11-13 17:38:22,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 242 Invalid, 1695 Unknown, 0 Unchecked, 6.37ms Time], IncrementalHoareTripleChecker [41 Valid, 1654 Invalid, 0 Unknown, 0 Unchecked, 866.31ms Time] [2021-11-13 17:38:22,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3253 states. [2021-11-13 17:38:22,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3253 to 2837. [2021-11-13 17:38:22,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2837 states, 2823 states have (on average 1.128586609989373) internal successors, (3186), 2824 states have internal predecessors, (3186), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:22,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2837 states to 2837 states and 3198 transitions. [2021-11-13 17:38:22,463 INFO L78 Accepts]: Start accepts. Automaton has 2837 states and 3198 transitions. Word has length 119 [2021-11-13 17:38:22,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:38:22,463 INFO L470 AbstractCegarLoop]: Abstraction has 2837 states and 3198 transitions. [2021-11-13 17:38:22,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 4.490566037735849) internal successors, (238), 50 states have internal predecessors, (238), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:22,463 INFO L276 IsEmpty]: Start isEmpty. Operand 2837 states and 3198 transitions. [2021-11-13 17:38:22,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 17:38:22,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:38:22,467 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:38:22,497 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-13 17:38:22,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:38:22,671 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:38:22,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:38:22,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1551891920, now seen corresponding path program 22 times [2021-11-13 17:38:22,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:38:22,672 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833169247] [2021-11-13 17:38:22,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:38:22,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:38:22,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:38:24,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:38:24,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:38:24,266 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 35 proven. 231 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 17:38:24,266 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:38:24,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833169247] [2021-11-13 17:38:24,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833169247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:38:24,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323578858] [2021-11-13 17:38:24,267 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:38:24,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:38:24,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:38:24,268 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:38:24,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-13 17:38:24,418 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:38:24,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:38:24,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-13 17:38:24,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:38:24,469 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:38:24,470 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:38:24,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:38:25,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-13 17:38:25,507 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-13 17:38:25,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-13 17:38:28,122 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-13 17:38:28,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 63 [2021-11-13 17:38:28,149 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-13 17:38:28,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 66 [2021-11-13 17:38:28,238 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 105 proven. 133 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:38:28,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:38:32,923 INFO L354 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2021-11-13 17:38:32,924 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 380 treesize of output 344 [2021-11-13 17:38:34,179 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 95 proven. 143 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:38:34,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323578858] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:38:34,179 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:38:34,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 25, 25] total 77 [2021-11-13 17:38:34,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567781209] [2021-11-13 17:38:34,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:38:34,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-13 17:38:34,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:38:34,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-13 17:38:34,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=5542, Unknown=1, NotChecked=0, Total=5852 [2021-11-13 17:38:34,182 INFO L87 Difference]: Start difference. First operand 2837 states and 3198 transitions. Second operand has 77 states, 74 states have (on average 3.8378378378378377) internal successors, (284), 73 states have internal predecessors, (284), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:58,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:38:58,828 INFO L93 Difference]: Finished difference Result 3376 states and 3776 transitions. [2021-11-13 17:38:58,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-13 17:38:58,828 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 74 states have (on average 3.8378378378378377) internal successors, (284), 73 states have internal predecessors, (284), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-11-13 17:38:58,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:38:58,831 INFO L225 Difference]: With dead ends: 3376 [2021-11-13 17:38:58,831 INFO L226 Difference]: Without dead ends: 3070 [2021-11-13 17:38:58,832 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3634 ImplicationChecksByTransitivity, 29.5s TimeCoverageRelationStatistics Valid=1235, Invalid=17396, Unknown=1, NotChecked=0, Total=18632 [2021-11-13 17:38:58,833 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 236 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 2660 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1193.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 236 SdHoareTripleChecker+Valid, 668 SdHoareTripleChecker+Invalid, 4319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.77ms SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 2660 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1601 IncrementalHoareTripleChecker+Unchecked, 1410.10ms IncrementalHoareTripleChecker+Time [2021-11-13 17:38:58,833 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [236 Valid, 668 Invalid, 4319 Unknown, 0 Unchecked, 9.77ms Time], IncrementalHoareTripleChecker [58 Valid, 2660 Invalid, 0 Unknown, 1601 Unchecked, 1410.10ms Time] [2021-11-13 17:38:58,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3070 states. [2021-11-13 17:38:58,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3070 to 2737. [2021-11-13 17:38:58,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2737 states, 2723 states have (on average 1.12559676827029) internal successors, (3065), 2724 states have internal predecessors, (3065), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:58,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2737 states to 2737 states and 3077 transitions. [2021-11-13 17:38:58,870 INFO L78 Accepts]: Start accepts. Automaton has 2737 states and 3077 transitions. Word has length 120 [2021-11-13 17:38:58,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:38:58,871 INFO L470 AbstractCegarLoop]: Abstraction has 2737 states and 3077 transitions. [2021-11-13 17:38:58,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 74 states have (on average 3.8378378378378377) internal successors, (284), 73 states have internal predecessors, (284), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:38:58,871 INFO L276 IsEmpty]: Start isEmpty. Operand 2737 states and 3077 transitions. [2021-11-13 17:38:58,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 17:38:58,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:38:58,875 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:38:58,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-13 17:38:59,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:38:59,091 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:38:59,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:38:59,092 INFO L85 PathProgramCache]: Analyzing trace with hash -444061126, now seen corresponding path program 23 times [2021-11-13 17:38:59,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:38:59,092 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903467016] [2021-11-13 17:38:59,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:38:59,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:38:59,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:00,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:39:00,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:00,236 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 35 proven. 231 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 17:39:00,236 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:39:00,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903467016] [2021-11-13 17:39:00,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903467016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:39:00,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779661780] [2021-11-13 17:39:00,237 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:39:00,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:39:00,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:39:00,237 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:39:00,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-13 17:39:00,440 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-13 17:39:00,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:39:00,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-13 17:39:00,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:39:00,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:39:00,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:39:01,020 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:39:01,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:39:03,182 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-13 17:39:03,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 52 [2021-11-13 17:39:03,246 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 35 proven. 203 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:39:03,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:39:04,417 WARN L838 $PredicateComparison]: unable to prove that (forall ((main_~nondetString2~0.offset Int) (main_~length2~0 Int)) (= (select (select (store |c_#memory_int| c_main_~nondetString2~0.base (store (select |c_#memory_int| c_main_~nondetString2~0.base) (+ (- 1) main_~nondetString2~0.offset main_~length2~0) 0)) c_main_~nondetString1~0.base) (+ 5 c_main_~nondetString1~0.offset)) 0)) is different from false [2021-11-13 17:39:04,423 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 56 treesize of output 50 [2021-11-13 17:39:04,972 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 35 proven. 203 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:39:04,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779661780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:39:04,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:39:04,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 26, 26] total 70 [2021-11-13 17:39:04,972 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083827286] [2021-11-13 17:39:04,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:39:04,973 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-13 17:39:04,973 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:39:04,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-13 17:39:04,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=4488, Unknown=1, NotChecked=134, Total=4830 [2021-11-13 17:39:04,974 INFO L87 Difference]: Start difference. First operand 2737 states and 3077 transitions. Second operand has 70 states, 67 states have (on average 3.611940298507463) internal successors, (242), 66 states have internal predecessors, (242), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:19,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:39:19,047 INFO L93 Difference]: Finished difference Result 2758 states and 3087 transitions. [2021-11-13 17:39:19,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-13 17:39:19,048 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 67 states have (on average 3.611940298507463) internal successors, (242), 66 states have internal predecessors, (242), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-11-13 17:39:19,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:39:19,049 INFO L225 Difference]: With dead ends: 2758 [2021-11-13 17:39:19,050 INFO L226 Difference]: Without dead ends: 2556 [2021-11-13 17:39:19,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 205 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2100 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=550, Invalid=11005, Unknown=5, NotChecked=212, Total=11772 [2021-11-13 17:39:19,050 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 190 mSDsluCounter, 665 mSDsCounter, 0 mSdLazyCounter, 1839 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 740.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 3355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.02ms SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 1839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1474 IncrementalHoareTripleChecker+Unchecked, 878.78ms IncrementalHoareTripleChecker+Time [2021-11-13 17:39:19,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 721 Invalid, 3355 Unknown, 0 Unchecked, 7.02ms Time], IncrementalHoareTripleChecker [42 Valid, 1839 Invalid, 0 Unknown, 1474 Unchecked, 878.78ms Time] [2021-11-13 17:39:19,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2556 states. [2021-11-13 17:39:19,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2556 to 2399. [2021-11-13 17:39:19,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2399 states, 2386 states have (on average 1.1274098910310142) internal successors, (2690), 2387 states have internal predecessors, (2690), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:19,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2399 states to 2399 states and 2701 transitions. [2021-11-13 17:39:19,071 INFO L78 Accepts]: Start accepts. Automaton has 2399 states and 2701 transitions. Word has length 120 [2021-11-13 17:39:19,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:39:19,071 INFO L470 AbstractCegarLoop]: Abstraction has 2399 states and 2701 transitions. [2021-11-13 17:39:19,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 67 states have (on average 3.611940298507463) internal successors, (242), 66 states have internal predecessors, (242), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:19,072 INFO L276 IsEmpty]: Start isEmpty. Operand 2399 states and 2701 transitions. [2021-11-13 17:39:19,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 17:39:19,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:39:19,074 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:39:19,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-13 17:39:19,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-11-13 17:39:19,275 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:39:19,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:39:19,276 INFO L85 PathProgramCache]: Analyzing trace with hash -458821588, now seen corresponding path program 24 times [2021-11-13 17:39:19,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:39:19,276 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838625347] [2021-11-13 17:39:19,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:39:19,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:39:19,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:19,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:39:19,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:19,854 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 35 proven. 193 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:39:19,854 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:39:19,854 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838625347] [2021-11-13 17:39:19,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838625347] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:39:19,854 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813720913] [2021-11-13 17:39:19,854 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:39:19,854 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:39:19,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:39:19,855 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:39:19,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-13 17:39:20,049 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-13 17:39:20,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:39:20,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-13 17:39:20,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:39:20,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:39:20,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:39:20,553 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:39:20,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:39:22,517 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-13 17:39:22,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 56 [2021-11-13 17:39:22,576 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 35 proven. 193 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:39:22,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:39:26,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:39:26,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:39:27,227 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 35 proven. 193 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:39:27,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813720913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:39:27,227 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:39:27,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 25] total 61 [2021-11-13 17:39:27,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503232550] [2021-11-13 17:39:27,228 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:39:27,228 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-13 17:39:27,228 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:39:27,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-13 17:39:27,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=3469, Unknown=0, NotChecked=0, Total=3660 [2021-11-13 17:39:27,229 INFO L87 Difference]: Start difference. First operand 2399 states and 2701 transitions. Second operand has 61 states, 60 states have (on average 3.7) internal successors, (222), 57 states have internal predecessors, (222), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:36,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:39:36,137 INFO L93 Difference]: Finished difference Result 2330 states and 2617 transitions. [2021-11-13 17:39:36,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 17:39:36,137 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 3.7) internal successors, (222), 57 states have internal predecessors, (222), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-11-13 17:39:36,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:39:36,139 INFO L225 Difference]: With dead ends: 2330 [2021-11-13 17:39:36,139 INFO L226 Difference]: Without dead ends: 2058 [2021-11-13 17:39:36,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 205 SyntacticMatches, 4 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1271 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=379, Invalid=6427, Unknown=0, NotChecked=0, Total=6806 [2021-11-13 17:39:36,140 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 128 mSDsluCounter, 590 mSDsCounter, 0 mSdLazyCounter, 1110 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 361.89ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 2654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.17ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1528 IncrementalHoareTripleChecker+Unchecked, 437.61ms IncrementalHoareTripleChecker+Time [2021-11-13 17:39:36,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [128 Valid, 642 Invalid, 2654 Unknown, 0 Unchecked, 4.17ms Time], IncrementalHoareTripleChecker [16 Valid, 1110 Invalid, 0 Unknown, 1528 Unchecked, 437.61ms Time] [2021-11-13 17:39:36,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2058 states. [2021-11-13 17:39:36,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2058 to 2052. [2021-11-13 17:39:36,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2052 states, 2040 states have (on average 1.1264705882352941) internal successors, (2298), 2041 states have internal predecessors, (2298), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:36,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2052 states to 2052 states and 2308 transitions. [2021-11-13 17:39:36,165 INFO L78 Accepts]: Start accepts. Automaton has 2052 states and 2308 transitions. Word has length 120 [2021-11-13 17:39:36,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:39:36,165 INFO L470 AbstractCegarLoop]: Abstraction has 2052 states and 2308 transitions. [2021-11-13 17:39:36,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 3.7) internal successors, (222), 57 states have internal predecessors, (222), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:36,166 INFO L276 IsEmpty]: Start isEmpty. Operand 2052 states and 2308 transitions. [2021-11-13 17:39:36,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 17:39:36,168 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:39:36,169 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:39:36,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-13 17:39:36,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-11-13 17:39:36,383 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:39:36,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:39:36,383 INFO L85 PathProgramCache]: Analyzing trace with hash -1612191734, now seen corresponding path program 25 times [2021-11-13 17:39:36,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:39:36,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693218009] [2021-11-13 17:39:36,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:39:36,384 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:39:36,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:37,226 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:39:37,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:37,236 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 35 proven. 253 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-13 17:39:37,236 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:39:37,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693218009] [2021-11-13 17:39:37,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693218009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:39:37,237 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492074504] [2021-11-13 17:39:37,237 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:39:37,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:39:37,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:39:37,243 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:39:37,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-13 17:39:37,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:37,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-13 17:39:37,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:39:37,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:39:37,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-13 17:39:37,945 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-13 17:39:37,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:39:42,056 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-13 17:39:42,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 52 [2021-11-13 17:39:42,128 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 35 proven. 187 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-13 17:39:42,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:39:43,671 WARN L838 $PredicateComparison]: unable to prove that (forall ((main_~nondetString2~0.offset Int) (main_~length2~0 Int)) (= (select (select (store |c_#memory_int| c_main_~nondetString2~0.base (store (select |c_#memory_int| c_main_~nondetString2~0.base) (+ (- 1) main_~nondetString2~0.offset main_~length2~0) 0)) c_main_~nondetString1~0.base) (+ 5 c_main_~nondetString1~0.offset)) 0)) is different from false [2021-11-13 17:39:43,676 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 56 treesize of output 50 [2021-11-13 17:39:44,172 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 35 proven. 187 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-13 17:39:44,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492074504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:39:44,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:39:44,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 26, 26] total 68 [2021-11-13 17:39:44,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269541756] [2021-11-13 17:39:44,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:39:44,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-13 17:39:44,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:39:44,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-13 17:39:44,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=4190, Unknown=1, NotChecked=130, Total=4556 [2021-11-13 17:39:44,174 INFO L87 Difference]: Start difference. First operand 2052 states and 2308 transitions. Second operand has 68 states, 66 states have (on average 3.5606060606060606) internal successors, (235), 64 states have internal predecessors, (235), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:50,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:39:50,031 INFO L93 Difference]: Finished difference Result 2000 states and 2246 transitions. [2021-11-13 17:39:50,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-13 17:39:50,031 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 66 states have (on average 3.5606060606060606) internal successors, (235), 64 states have internal predecessors, (235), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-11-13 17:39:50,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:39:50,033 INFO L225 Difference]: With dead ends: 2000 [2021-11-13 17:39:50,033 INFO L226 Difference]: Without dead ends: 1828 [2021-11-13 17:39:50,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 205 SyntacticMatches, 3 SemanticMatches, 94 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1937 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=454, Invalid=8477, Unknown=3, NotChecked=186, Total=9120 [2021-11-13 17:39:50,034 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 127 mSDsluCounter, 658 mSDsCounter, 0 mSdLazyCounter, 1627 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 566.26ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 710 SdHoareTripleChecker+Invalid, 2418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.09ms SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1627 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 761 IncrementalHoareTripleChecker+Unchecked, 679.77ms IncrementalHoareTripleChecker+Time [2021-11-13 17:39:50,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [127 Valid, 710 Invalid, 2418 Unknown, 0 Unchecked, 5.09ms Time], IncrementalHoareTripleChecker [30 Valid, 1627 Invalid, 0 Unknown, 761 Unchecked, 679.77ms Time] [2021-11-13 17:39:50,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1828 states. [2021-11-13 17:39:50,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1828 to 1824. [2021-11-13 17:39:50,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1824 states, 1813 states have (on average 1.1312741312741312) internal successors, (2051), 1814 states have internal predecessors, (2051), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:50,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1824 states to 1824 states and 2060 transitions. [2021-11-13 17:39:50,051 INFO L78 Accepts]: Start accepts. Automaton has 1824 states and 2060 transitions. Word has length 120 [2021-11-13 17:39:50,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:39:50,051 INFO L470 AbstractCegarLoop]: Abstraction has 1824 states and 2060 transitions. [2021-11-13 17:39:50,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 66 states have (on average 3.5606060606060606) internal successors, (235), 64 states have internal predecessors, (235), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:39:50,052 INFO L276 IsEmpty]: Start isEmpty. Operand 1824 states and 2060 transitions. [2021-11-13 17:39:50,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-13 17:39:50,053 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:39:50,054 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:39:50,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-13 17:39:50,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-13 17:39:50,254 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:39:50,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:39:50,254 INFO L85 PathProgramCache]: Analyzing trace with hash 1279071050, now seen corresponding path program 26 times [2021-11-13 17:39:50,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:39:50,255 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492167537] [2021-11-13 17:39:50,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:39:50,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:39:50,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:50,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:39:50,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:39:50,522 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 28 proven. 215 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:39:50,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:39:50,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492167537] [2021-11-13 17:39:50,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492167537] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:39:50,523 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1165777173] [2021-11-13 17:39:50,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:39:50,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:39:50,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:39:50,524 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:39:50,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-13 17:39:50,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:39:50,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:39:50,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-13 17:39:50,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:39:50,703 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:39:50,703 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:39:51,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:39:52,092 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-11-13 17:39:52,093 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 34 treesize of output 25 [2021-11-13 17:39:52,157 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 89 proven. 131 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-13 17:39:52,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:39:53,297 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 24 treesize of output 22 [2021-11-13 17:39:53,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 28 [2021-11-13 17:39:54,638 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 80 proven. 140 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-13 17:39:54,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1165777173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:39:54,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:39:54,638 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 22, 22] total 58 [2021-11-13 17:39:54,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493084529] [2021-11-13 17:39:54,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:39:54,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-13 17:39:54,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:39:54,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-13 17:39:54,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=3041, Unknown=0, NotChecked=0, Total=3306 [2021-11-13 17:39:54,640 INFO L87 Difference]: Start difference. First operand 1824 states and 2060 transitions. Second operand has 58 states, 56 states have (on average 4.625) internal successors, (259), 54 states have internal predecessors, (259), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:00,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:40:00,721 INFO L93 Difference]: Finished difference Result 2363 states and 2634 transitions. [2021-11-13 17:40:00,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-13 17:40:00,722 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 56 states have (on average 4.625) internal successors, (259), 54 states have internal predecessors, (259), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 120 [2021-11-13 17:40:00,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:40:00,723 INFO L225 Difference]: With dead ends: 2363 [2021-11-13 17:40:00,723 INFO L226 Difference]: Without dead ends: 2336 [2021-11-13 17:40:00,724 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5699 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=2340, Invalid=18830, Unknown=0, NotChecked=0, Total=21170 [2021-11-13 17:40:00,724 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 668 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 4067 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1831.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 668 SdHoareTripleChecker+Valid, 500 SdHoareTripleChecker+Invalid, 5241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.98ms SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 4067 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1058 IncrementalHoareTripleChecker+Unchecked, 2187.05ms IncrementalHoareTripleChecker+Time [2021-11-13 17:40:00,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [668 Valid, 500 Invalid, 5241 Unknown, 0 Unchecked, 13.98ms Time], IncrementalHoareTripleChecker [116 Valid, 4067 Invalid, 0 Unknown, 1058 Unchecked, 2187.05ms Time] [2021-11-13 17:40:00,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2336 states. [2021-11-13 17:40:00,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2336 to 2159. [2021-11-13 17:40:00,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2159 states, 2147 states have (on average 1.1290172333488588) internal successors, (2424), 2148 states have internal predecessors, (2424), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:00,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2159 states to 2159 states and 2434 transitions. [2021-11-13 17:40:00,741 INFO L78 Accepts]: Start accepts. Automaton has 2159 states and 2434 transitions. Word has length 120 [2021-11-13 17:40:00,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:40:00,741 INFO L470 AbstractCegarLoop]: Abstraction has 2159 states and 2434 transitions. [2021-11-13 17:40:00,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 56 states have (on average 4.625) internal successors, (259), 54 states have internal predecessors, (259), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:00,742 INFO L276 IsEmpty]: Start isEmpty. Operand 2159 states and 2434 transitions. [2021-11-13 17:40:00,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-13 17:40:00,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:40:00,744 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:40:00,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-13 17:40:00,944 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-11-13 17:40:00,944 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:40:00,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:40:00,945 INFO L85 PathProgramCache]: Analyzing trace with hash 938135926, now seen corresponding path program 13 times [2021-11-13 17:40:00,945 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:40:00,945 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668508526] [2021-11-13 17:40:00,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:40:00,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:40:00,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:01,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:40:01,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:01,274 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 157 proven. 92 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 17:40:01,274 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:40:01,275 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668508526] [2021-11-13 17:40:01,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668508526] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:40:01,275 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393976079] [2021-11-13 17:40:01,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:40:01,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:40:01,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:40:01,276 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:40:01,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-13 17:40:01,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:01,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-13 17:40:01,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:40:01,466 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:40:01,467 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:40:01,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:40:02,243 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 204 proven. 45 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 17:40:02,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:40:02,887 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 169 proven. 80 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 17:40:02,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393976079] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:40:02,887 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:40:02,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 51 [2021-11-13 17:40:02,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818454526] [2021-11-13 17:40:02,887 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:40:02,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-13 17:40:02,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:40:02,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-13 17:40:02,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=2167, Unknown=0, NotChecked=0, Total=2550 [2021-11-13 17:40:02,888 INFO L87 Difference]: Start difference. First operand 2159 states and 2434 transitions. Second operand has 51 states, 51 states have (on average 4.529411764705882) internal successors, (231), 47 states have internal predecessors, (231), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:04,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:40:04,499 INFO L93 Difference]: Finished difference Result 4579 states and 5092 transitions. [2021-11-13 17:40:04,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-13 17:40:04,500 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 4.529411764705882) internal successors, (231), 47 states have internal predecessors, (231), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 123 [2021-11-13 17:40:04,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:40:04,503 INFO L225 Difference]: With dead ends: 4579 [2021-11-13 17:40:04,503 INFO L226 Difference]: Without dead ends: 4471 [2021-11-13 17:40:04,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=796, Invalid=4316, Unknown=0, NotChecked=0, Total=5112 [2021-11-13 17:40:04,504 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 223 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 1752 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 767.84ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 1793 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.92ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 1752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 927.25ms IncrementalHoareTripleChecker+Time [2021-11-13 17:40:04,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [223 Valid, 229 Invalid, 1793 Unknown, 0 Unchecked, 5.92ms Time], IncrementalHoareTripleChecker [41 Valid, 1752 Invalid, 0 Unknown, 0 Unchecked, 927.25ms Time] [2021-11-13 17:40:04,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4471 states. [2021-11-13 17:40:04,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4471 to 2600. [2021-11-13 17:40:04,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2600 states, 2588 states have (on average 1.1367851622874807) internal successors, (2942), 2589 states have internal predecessors, (2942), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:04,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2600 states to 2600 states and 2952 transitions. [2021-11-13 17:40:04,549 INFO L78 Accepts]: Start accepts. Automaton has 2600 states and 2952 transitions. Word has length 123 [2021-11-13 17:40:04,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:40:04,550 INFO L470 AbstractCegarLoop]: Abstraction has 2600 states and 2952 transitions. [2021-11-13 17:40:04,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 4.529411764705882) internal successors, (231), 47 states have internal predecessors, (231), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:04,550 INFO L276 IsEmpty]: Start isEmpty. Operand 2600 states and 2952 transitions. [2021-11-13 17:40:04,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 17:40:04,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:40:04,552 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:40:04,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-13 17:40:04,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:40:04,754 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:40:04,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:40:04,755 INFO L85 PathProgramCache]: Analyzing trace with hash -272798349, now seen corresponding path program 27 times [2021-11-13 17:40:04,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:40:04,755 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837264926] [2021-11-13 17:40:04,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:40:04,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:40:04,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:05,069 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:40:05,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:05,071 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 28 proven. 263 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:40:05,071 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:40:05,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837264926] [2021-11-13 17:40:05,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837264926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:40:05,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958723633] [2021-11-13 17:40:05,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:40:05,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:40:05,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:40:05,074 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:40:05,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-13 17:40:05,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-13 17:40:05,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:40:05,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-13 17:40:05,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:40:05,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-13 17:40:05,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-13 17:40:05,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-13 17:40:05,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 34 [2021-11-13 17:40:08,056 INFO L354 Elim1Store]: treesize reduction 71, result has 22.8 percent of original size [2021-11-13 17:40:08,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 56 treesize of output 47 [2021-11-13 17:40:08,338 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 106 proven. 114 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-11-13 17:40:08,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:40:10,312 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-13 17:40:10,312 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 2 case distinctions, treesize of input 226 treesize of output 186 [2021-11-13 17:40:10,320 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:40:10,320 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 182 treesize of output 176 [2021-11-13 17:40:10,392 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-13 17:40:10,393 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 138 treesize of output 129 [2021-11-13 17:40:10,457 INFO L354 Elim1Store]: treesize reduction 5, result has 85.7 percent of original size [2021-11-13 17:40:10,458 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 85 treesize of output 97 [2021-11-13 17:40:12,446 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 13 proven. 204 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-11-13 17:40:12,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958723633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:40:12,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:40:12,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 20] total 56 [2021-11-13 17:40:12,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054041817] [2021-11-13 17:40:12,447 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:40:12,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-13 17:40:12,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:40:12,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-13 17:40:12,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=2955, Unknown=0, NotChecked=0, Total=3192 [2021-11-13 17:40:12,448 INFO L87 Difference]: Start difference. First operand 2600 states and 2952 transitions. Second operand has 57 states, 54 states have (on average 5.037037037037037) internal successors, (272), 53 states have internal predecessors, (272), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:20,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:40:20,315 INFO L93 Difference]: Finished difference Result 5354 states and 6008 transitions. [2021-11-13 17:40:20,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-13 17:40:20,316 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 54 states have (on average 5.037037037037037) internal successors, (272), 53 states have internal predecessors, (272), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-11-13 17:40:20,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:40:20,319 INFO L225 Difference]: With dead ends: 5354 [2021-11-13 17:40:20,319 INFO L226 Difference]: Without dead ends: 5354 [2021-11-13 17:40:20,320 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 228 SyntacticMatches, 15 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5578 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=2517, Invalid=17789, Unknown=0, NotChecked=0, Total=20306 [2021-11-13 17:40:20,320 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 405 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 972 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 453.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 2894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.82ms SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 972 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1898 IncrementalHoareTripleChecker+Unchecked, 535.81ms IncrementalHoareTripleChecker+Time [2021-11-13 17:40:20,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [405 Valid, 411 Invalid, 2894 Unknown, 0 Unchecked, 5.82ms Time], IncrementalHoareTripleChecker [24 Valid, 972 Invalid, 0 Unknown, 1898 Unchecked, 535.81ms Time] [2021-11-13 17:40:20,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5354 states. [2021-11-13 17:40:20,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5354 to 3137. [2021-11-13 17:40:20,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3137 states, 3125 states have (on average 1.13152) internal successors, (3536), 3126 states have internal predecessors, (3536), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:20,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3137 states to 3137 states and 3546 transitions. [2021-11-13 17:40:20,359 INFO L78 Accepts]: Start accepts. Automaton has 3137 states and 3546 transitions. Word has length 124 [2021-11-13 17:40:20,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:40:20,360 INFO L470 AbstractCegarLoop]: Abstraction has 3137 states and 3546 transitions. [2021-11-13 17:40:20,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 54 states have (on average 5.037037037037037) internal successors, (272), 53 states have internal predecessors, (272), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:20,360 INFO L276 IsEmpty]: Start isEmpty. Operand 3137 states and 3546 transitions. [2021-11-13 17:40:20,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 17:40:20,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:40:20,363 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:40:20,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-13 17:40:20,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:40:20,567 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:40:20,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:40:20,568 INFO L85 PathProgramCache]: Analyzing trace with hash 472649469, now seen corresponding path program 28 times [2021-11-13 17:40:20,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:40:20,568 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840819768] [2021-11-13 17:40:20,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:40:20,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:40:20,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:20,887 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:40:20,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:40:20,890 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 28 proven. 263 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:40:20,891 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:40:20,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840819768] [2021-11-13 17:40:20,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840819768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:40:20,891 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82454842] [2021-11-13 17:40:20,891 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:40:20,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:40:20,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:40:20,892 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:40:20,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-13 17:40:21,062 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:40:21,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:40:21,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-13 17:40:21,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:40:21,105 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:40:21,105 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:40:21,948 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 24 treesize of output 20 [2021-11-13 17:40:22,030 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-13 17:40:22,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-13 17:40:28,072 INFO L354 Elim1Store]: treesize reduction 43, result has 55.2 percent of original size [2021-11-13 17:40:28,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 74 [2021-11-13 17:40:28,370 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 148 proven. 148 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-13 17:40:28,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:40:34,049 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-13 17:40:34,049 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 424 treesize of output 380 [2021-11-13 17:40:34,975 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-13 17:40:34,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82454842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:40:34,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:40:34,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 30, 25] total 72 [2021-11-13 17:40:34,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958527556] [2021-11-13 17:40:34,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:40:34,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-13 17:40:34,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:40:34,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-13 17:40:34,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=4902, Unknown=2, NotChecked=0, Total=5256 [2021-11-13 17:40:34,977 INFO L87 Difference]: Start difference. First operand 3137 states and 3546 transitions. Second operand has 73 states, 70 states have (on average 4.414285714285715) internal successors, (309), 69 states have internal predecessors, (309), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:40:37,324 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (select |c_#length| c_main_~nondetString1~0.base))) (let ((.cse1 (< .cse0 6)) (.cse2 (+ c_main_~nondetString1~0.offset c_main_~length1~0))) (and (or (= c_main_~nondetString2~0.base c_main_~nondetString1~0.base) (= c_main_~length1~0 .cse0)) (<= 7 c_main_~length1~0) (<= (+ 7 c_main_~nondetString1~0.offset) .cse0) (or .cse1 (<= .cse2 .cse0)) (= c_main_~nondetString1~0.offset 0) (= (select |c_#length| c_main_~nondetString2~0.base) c_main_~length2~0) (or .cse1 (<= .cse0 .cse2)) (<= 5 c_main_~i~0) (forall ((substring_~pt~0.offset Int) (main_~nondetString2~0.offset Int) (substring_~pt~0.base Int) (substring_~ps~0.offset Int)) (let ((.cse5 (store |c_#memory_int| c_main_~nondetString2~0.base (store (select |c_#memory_int| c_main_~nondetString2~0.base) (+ (- 1) main_~nondetString2~0.offset c_main_~length2~0) 0)))) (let ((.cse4 (select (select .cse5 substring_~pt~0.base) substring_~pt~0.offset)) (.cse3 (select |c_#length| c_main_~nondetString1~0.base))) (or (< .cse3 (+ 6 substring_~ps~0.offset)) (< substring_~ps~0.offset 0) (not (= .cse4 (select (select .cse5 c_main_~nondetString1~0.base) (+ 5 substring_~ps~0.offset)))) (= .cse4 0) (<= (+ 7 substring_~ps~0.offset) .cse3)))))))) is different from false [2021-11-13 17:41:35,512 WARN L838 $PredicateComparison]: unable to prove that (and (= |c_substring_#in~s.offset| 0) (forall ((substring_~pt~0.offset Int) (substring_~pt~0.base Int) (substring_~ps~0.offset Int)) (let ((.cse0 (select (select |c_#memory_int| substring_~pt~0.base) substring_~pt~0.offset)) (.cse1 (select |c_#length| |c_substring_#in~s.base|))) (or (= .cse0 0) (< .cse1 (+ 6 substring_~ps~0.offset)) (not (= (select (select |c_#memory_int| |c_substring_#in~s.base|) (+ 5 substring_~ps~0.offset)) .cse0)) (<= (+ 7 substring_~ps~0.offset) .cse1) (< substring_~ps~0.offset 0)))) (<= 7 (select |c_#length| |c_substring_#in~s.base|))) is different from false [2021-11-13 17:41:46,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:41:46,150 INFO L93 Difference]: Finished difference Result 4684 states and 5212 transitions. [2021-11-13 17:41:46,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-11-13 17:41:46,150 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 70 states have (on average 4.414285714285715) internal successors, (309), 69 states have internal predecessors, (309), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-11-13 17:41:46,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:41:46,154 INFO L225 Difference]: With dead ends: 4684 [2021-11-13 17:41:46,154 INFO L226 Difference]: Without dead ends: 4543 [2021-11-13 17:41:46,156 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 213 SyntacticMatches, 3 SemanticMatches, 195 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 11752 ImplicationChecksByTransitivity, 77.2s TimeCoverageRelationStatistics Valid=2409, Invalid=35414, Unknown=15, NotChecked=774, Total=38612 [2021-11-13 17:41:46,156 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 265 mSDsluCounter, 611 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 262.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 636 SdHoareTripleChecker+Invalid, 1171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.77ms SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 492 IncrementalHoareTripleChecker+Unchecked, 309.65ms IncrementalHoareTripleChecker+Time [2021-11-13 17:41:46,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [265 Valid, 636 Invalid, 1171 Unknown, 0 Unchecked, 3.77ms Time], IncrementalHoareTripleChecker [59 Valid, 620 Invalid, 0 Unknown, 492 Unchecked, 309.65ms Time] [2021-11-13 17:41:46,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4543 states. [2021-11-13 17:41:46,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4543 to 3367. [2021-11-13 17:41:46,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3367 states, 3355 states have (on average 1.130253353204173) internal successors, (3792), 3356 states have internal predecessors, (3792), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:46,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3367 states to 3367 states and 3802 transitions. [2021-11-13 17:41:46,193 INFO L78 Accepts]: Start accepts. Automaton has 3367 states and 3802 transitions. Word has length 124 [2021-11-13 17:41:46,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:41:46,194 INFO L470 AbstractCegarLoop]: Abstraction has 3367 states and 3802 transitions. [2021-11-13 17:41:46,194 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 70 states have (on average 4.414285714285715) internal successors, (309), 69 states have internal predecessors, (309), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:46,194 INFO L276 IsEmpty]: Start isEmpty. Operand 3367 states and 3802 transitions. [2021-11-13 17:41:46,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 17:41:46,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:41:46,198 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:41:46,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-13 17:41:46,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:41:46,399 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:41:46,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:41:46,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1572991795, now seen corresponding path program 29 times [2021-11-13 17:41:46,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:41:46,400 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096130987] [2021-11-13 17:41:46,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:41:46,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:41:46,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:46,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:41:46,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:46,733 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 28 proven. 263 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:41:46,733 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:41:46,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096130987] [2021-11-13 17:41:46,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096130987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:41:46,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520342789] [2021-11-13 17:41:46,733 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-13 17:41:46,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:41:46,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:41:46,746 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:41:46,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-13 17:41:46,932 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-13 17:41:46,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:41:46,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-13 17:41:46,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:41:46,975 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:41:46,975 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:41:46,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:41:48,087 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 45 proven. 246 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:41:48,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:41:49,509 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 66 proven. 225 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:41:49,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520342789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:41:49,509 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:41:49,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 17] total 48 [2021-11-13 17:41:49,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840570137] [2021-11-13 17:41:49,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:41:49,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-13 17:41:49,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:41:49,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-13 17:41:49,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2118, Unknown=0, NotChecked=0, Total=2352 [2021-11-13 17:41:49,511 INFO L87 Difference]: Start difference. First operand 3367 states and 3802 transitions. Second operand has 49 states, 48 states have (on average 6.4375) internal successors, (309), 46 states have internal predecessors, (309), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:51,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:41:51,795 INFO L93 Difference]: Finished difference Result 5731 states and 6473 transitions. [2021-11-13 17:41:51,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-13 17:41:51,796 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 6.4375) internal successors, (309), 46 states have internal predecessors, (309), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-11-13 17:41:51,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:41:51,800 INFO L225 Difference]: With dead ends: 5731 [2021-11-13 17:41:51,800 INFO L226 Difference]: Without dead ends: 5731 [2021-11-13 17:41:51,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=580, Invalid=4970, Unknown=0, NotChecked=0, Total=5550 [2021-11-13 17:41:51,801 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 668 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 2231 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1075.46ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 668 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 2389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.80ms SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 2231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1293.85ms IncrementalHoareTripleChecker+Time [2021-11-13 17:41:51,801 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [668 Valid, 301 Invalid, 2389 Unknown, 0 Unchecked, 11.80ms Time], IncrementalHoareTripleChecker [158 Valid, 2231 Invalid, 0 Unknown, 0 Unchecked, 1293.85ms Time] [2021-11-13 17:41:51,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5731 states. [2021-11-13 17:41:51,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5731 to 3562. [2021-11-13 17:41:51,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3562 states, 3550 states have (on average 1.1352112676056338) internal successors, (4030), 3551 states have internal predecessors, (4030), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:51,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3562 states to 3562 states and 4040 transitions. [2021-11-13 17:41:51,857 INFO L78 Accepts]: Start accepts. Automaton has 3562 states and 4040 transitions. Word has length 124 [2021-11-13 17:41:51,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:41:51,858 INFO L470 AbstractCegarLoop]: Abstraction has 3562 states and 4040 transitions. [2021-11-13 17:41:51,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 6.4375) internal successors, (309), 46 states have internal predecessors, (309), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:51,858 INFO L276 IsEmpty]: Start isEmpty. Operand 3562 states and 4040 transitions. [2021-11-13 17:41:51,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 17:41:51,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:41:51,862 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:41:51,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-13 17:41:52,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-11-13 17:41:52,063 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:41:52,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:41:52,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1288048815, now seen corresponding path program 30 times [2021-11-13 17:41:52,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:41:52,065 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941285626] [2021-11-13 17:41:52,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:41:52,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:41:52,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:52,470 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:41:52,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:52,477 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 28 proven. 245 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:41:52,477 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:41:52,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941285626] [2021-11-13 17:41:52,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941285626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:41:52,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720658529] [2021-11-13 17:41:52,478 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-13 17:41:52,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:41:52,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:41:52,480 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:41:52,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-13 17:41:52,854 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-13 17:41:52,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:41:52,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-13 17:41:52,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:41:53,883 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 45 proven. 228 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:41:53,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:41:54,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-13 17:41:55,058 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 45 proven. 228 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-13 17:41:55,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720658529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:41:55,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:41:55,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 48 [2021-11-13 17:41:55,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689066443] [2021-11-13 17:41:55,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:41:55,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-13 17:41:55,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:41:55,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-13 17:41:55,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2125, Unknown=0, NotChecked=0, Total=2352 [2021-11-13 17:41:55,060 INFO L87 Difference]: Start difference. First operand 3562 states and 4040 transitions. Second operand has 49 states, 48 states have (on average 5.833333333333333) internal successors, (280), 45 states have internal predecessors, (280), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:58,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:41:58,339 INFO L93 Difference]: Finished difference Result 4490 states and 5024 transitions. [2021-11-13 17:41:58,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-13 17:41:58,339 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 5.833333333333333) internal successors, (280), 45 states have internal predecessors, (280), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-11-13 17:41:58,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:41:58,343 INFO L225 Difference]: With dead ends: 4490 [2021-11-13 17:41:58,343 INFO L226 Difference]: Without dead ends: 4490 [2021-11-13 17:41:58,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1401 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=915, Invalid=6225, Unknown=0, NotChecked=0, Total=7140 [2021-11-13 17:41:58,344 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 1055 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 2115 mSolverCounterSat, 352 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1128.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1055 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 2467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.95ms SdHoareTripleChecker+Time, 352 IncrementalHoareTripleChecker+Valid, 2115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1346.16ms IncrementalHoareTripleChecker+Time [2021-11-13 17:41:58,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1055 Valid, 307 Invalid, 2467 Unknown, 0 Unchecked, 10.95ms Time], IncrementalHoareTripleChecker [352 Valid, 2115 Invalid, 0 Unknown, 0 Unchecked, 1346.16ms Time] [2021-11-13 17:41:58,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4490 states. [2021-11-13 17:41:58,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4490 to 3688. [2021-11-13 17:41:58,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3688 states, 3676 states have (on average 1.133569096844396) internal successors, (4167), 3677 states have internal predecessors, (4167), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:58,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3688 states to 3688 states and 4177 transitions. [2021-11-13 17:41:58,389 INFO L78 Accepts]: Start accepts. Automaton has 3688 states and 4177 transitions. Word has length 124 [2021-11-13 17:41:58,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:41:58,390 INFO L470 AbstractCegarLoop]: Abstraction has 3688 states and 4177 transitions. [2021-11-13 17:41:58,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 5.833333333333333) internal successors, (280), 45 states have internal predecessors, (280), 3 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:41:58,390 INFO L276 IsEmpty]: Start isEmpty. Operand 3688 states and 4177 transitions. [2021-11-13 17:41:58,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 17:41:58,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:41:58,394 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:41:58,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-13 17:41:58,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:41:58,595 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:41:58,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:41:58,595 INFO L85 PathProgramCache]: Analyzing trace with hash -525274803, now seen corresponding path program 31 times [2021-11-13 17:41:58,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:41:58,595 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184978974] [2021-11-13 17:41:58,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:41:58,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:41:58,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:58,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:41:58,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:58,894 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 28 proven. 231 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:41:58,894 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:41:58,894 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184978974] [2021-11-13 17:41:58,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184978974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:41:58,895 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271118399] [2021-11-13 17:41:58,895 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-13 17:41:58,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:41:58,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:41:58,896 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:41:58,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-13 17:41:59,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:41:59,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-13 17:41:59,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:41:59,066 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-13 17:41:59,066 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-13 17:41:59,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:42:00,160 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 45 proven. 214 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:42:00,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:42:01,452 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 66 proven. 193 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-13 17:42:01,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271118399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:42:01,453 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:42:01,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 52 [2021-11-13 17:42:01,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178003161] [2021-11-13 17:42:01,453 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:42:01,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-13 17:42:01,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:42:01,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-13 17:42:01,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=2521, Unknown=0, NotChecked=0, Total=2756 [2021-11-13 17:42:01,455 INFO L87 Difference]: Start difference. First operand 3688 states and 4177 transitions. Second operand has 53 states, 52 states have (on average 5.538461538461538) internal successors, (288), 49 states have internal predecessors, (288), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:04,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:42:04,118 INFO L93 Difference]: Finished difference Result 4042 states and 4519 transitions. [2021-11-13 17:42:04,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-13 17:42:04,119 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 5.538461538461538) internal successors, (288), 49 states have internal predecessors, (288), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-11-13 17:42:04,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:42:04,122 INFO L225 Difference]: With dead ends: 4042 [2021-11-13 17:42:04,122 INFO L226 Difference]: Without dead ends: 4042 [2021-11-13 17:42:04,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1813 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=818, Invalid=7192, Unknown=0, NotChecked=0, Total=8010 [2021-11-13 17:42:04,123 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 795 mSDsluCounter, 323 mSDsCounter, 0 mSdLazyCounter, 2726 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1091.73ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 795 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 2955 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.68ms SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 2726 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1306.38ms IncrementalHoareTripleChecker+Time [2021-11-13 17:42:04,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [795 Valid, 374 Invalid, 2955 Unknown, 0 Unchecked, 8.68ms Time], IncrementalHoareTripleChecker [229 Valid, 2726 Invalid, 0 Unknown, 0 Unchecked, 1306.38ms Time] [2021-11-13 17:42:04,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4042 states. [2021-11-13 17:42:04,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4042 to 3669. [2021-11-13 17:42:04,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3669 states, 3657 states have (on average 1.1323489198796828) internal successors, (4141), 3658 states have internal predecessors, (4141), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:04,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3669 states to 3669 states and 4151 transitions. [2021-11-13 17:42:04,207 INFO L78 Accepts]: Start accepts. Automaton has 3669 states and 4151 transitions. Word has length 124 [2021-11-13 17:42:04,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:42:04,208 INFO L470 AbstractCegarLoop]: Abstraction has 3669 states and 4151 transitions. [2021-11-13 17:42:04,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 5.538461538461538) internal successors, (288), 49 states have internal predecessors, (288), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:04,208 INFO L276 IsEmpty]: Start isEmpty. Operand 3669 states and 4151 transitions. [2021-11-13 17:42:04,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-13 17:42:04,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:42:04,211 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:42:04,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-13 17:42:04,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2021-11-13 17:42:04,412 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:42:04,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:42:04,413 INFO L85 PathProgramCache]: Analyzing trace with hash 567795529, now seen corresponding path program 32 times [2021-11-13 17:42:04,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:42:04,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777585169] [2021-11-13 17:42:04,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:42:04,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:42:04,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:04,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:42:04,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:04,714 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 28 proven. 221 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:42:04,714 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:42:04,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777585169] [2021-11-13 17:42:04,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777585169] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:42:04,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103802442] [2021-11-13 17:42:04,714 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:42:04,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:42:04,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:42:04,715 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:42:04,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-13 17:42:04,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:42:04,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:42:04,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-13 17:42:04,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:42:05,454 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 45 proven. 204 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:42:05,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:42:06,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-13 17:42:06,252 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 45 proven. 204 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-13 17:42:06,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103802442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:42:06,252 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:42:06,252 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 41 [2021-11-13 17:42:06,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696405488] [2021-11-13 17:42:06,252 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:42:06,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-13 17:42:06,253 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:42:06,253 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-13 17:42:06,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1556, Unknown=0, NotChecked=0, Total=1722 [2021-11-13 17:42:06,253 INFO L87 Difference]: Start difference. First operand 3669 states and 4151 transitions. Second operand has 42 states, 41 states have (on average 5.024390243902439) internal successors, (206), 38 states have internal predecessors, (206), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:08,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:42:08,398 INFO L93 Difference]: Finished difference Result 3960 states and 4433 transitions. [2021-11-13 17:42:08,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-13 17:42:08,399 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 5.024390243902439) internal successors, (206), 38 states have internal predecessors, (206), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 124 [2021-11-13 17:42:08,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:42:08,402 INFO L225 Difference]: With dead ends: 3960 [2021-11-13 17:42:08,402 INFO L226 Difference]: Without dead ends: 3960 [2021-11-13 17:42:08,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 225 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1297 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=672, Invalid=4730, Unknown=0, NotChecked=0, Total=5402 [2021-11-13 17:42:08,403 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 631 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 1877 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 867.97ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 631 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 2067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.00ms SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 1877 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1031.42ms IncrementalHoareTripleChecker+Time [2021-11-13 17:42:08,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [631 Valid, 313 Invalid, 2067 Unknown, 0 Unchecked, 7.00ms Time], IncrementalHoareTripleChecker [190 Valid, 1877 Invalid, 0 Unknown, 0 Unchecked, 1031.42ms Time] [2021-11-13 17:42:08,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3960 states. [2021-11-13 17:42:08,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3960 to 3643. [2021-11-13 17:42:08,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3643 states, 3631 states have (on average 1.1313687689341778) internal successors, (4108), 3632 states have internal predecessors, (4108), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:08,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3643 states to 3643 states and 4118 transitions. [2021-11-13 17:42:08,439 INFO L78 Accepts]: Start accepts. Automaton has 3643 states and 4118 transitions. Word has length 124 [2021-11-13 17:42:08,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:42:08,440 INFO L470 AbstractCegarLoop]: Abstraction has 3643 states and 4118 transitions. [2021-11-13 17:42:08,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 5.024390243902439) internal successors, (206), 38 states have internal predecessors, (206), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:08,440 INFO L276 IsEmpty]: Start isEmpty. Operand 3643 states and 4118 transitions. [2021-11-13 17:42:08,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-13 17:42:08,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:42:08,444 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:42:08,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-13 17:42:08,646 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2021-11-13 17:42:08,647 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:42:08,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:42:08,647 INFO L85 PathProgramCache]: Analyzing trace with hash 145226033, now seen corresponding path program 33 times [2021-11-13 17:42:08,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:42:08,647 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945117062] [2021-11-13 17:42:08,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:42:08,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:42:08,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:09,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:42:09,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:09,295 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 40 proven. 257 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-13 17:42:09,296 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:42:09,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945117062] [2021-11-13 17:42:09,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945117062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:42:09,296 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669708533] [2021-11-13 17:42:09,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-13 17:42:09,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:42:09,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:42:09,297 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:42:09,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-13 17:42:09,696 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-13 17:42:09,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:42:09,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-13 17:42:09,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:42:09,729 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:42:09,730 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:42:10,616 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 16 treesize of output 12 [2021-11-13 17:42:11,556 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-13 17:42:11,557 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 19 treesize of output 19 [2021-11-13 17:42:11,735 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 119 proven. 241 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-13 17:42:11,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:42:13,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 24 [2021-11-13 17:42:13,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 30 [2021-11-13 17:42:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 119 proven. 176 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-13 17:42:14,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669708533] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:42:14,477 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:42:14,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 24] total 77 [2021-11-13 17:42:14,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681179669] [2021-11-13 17:42:14,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:42:14,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-13 17:42:14,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:42:14,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-13 17:42:14,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=5481, Unknown=0, NotChecked=0, Total=5852 [2021-11-13 17:42:14,479 INFO L87 Difference]: Start difference. First operand 3643 states and 4118 transitions. Second operand has 77 states, 75 states have (on average 4.133333333333334) internal successors, (310), 73 states have internal predecessors, (310), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:25,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:42:25,177 INFO L93 Difference]: Finished difference Result 6535 states and 7206 transitions. [2021-11-13 17:42:25,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-11-13 17:42:25,178 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 75 states have (on average 4.133333333333334) internal successors, (310), 73 states have internal predecessors, (310), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-11-13 17:42:25,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:42:25,182 INFO L225 Difference]: With dead ends: 6535 [2021-11-13 17:42:25,182 INFO L226 Difference]: Without dead ends: 6463 [2021-11-13 17:42:25,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 216 SyntacticMatches, 1 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10930 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=3311, Invalid=37695, Unknown=0, NotChecked=0, Total=41006 [2021-11-13 17:42:25,184 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 810 mSDsluCounter, 492 mSDsCounter, 0 mSdLazyCounter, 6620 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2893.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 810 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 8011 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 20.54ms SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 6620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1209 IncrementalHoareTripleChecker+Unchecked, 3471.33ms IncrementalHoareTripleChecker+Time [2021-11-13 17:42:25,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [810 Valid, 553 Invalid, 8011 Unknown, 0 Unchecked, 20.54ms Time], IncrementalHoareTripleChecker [182 Valid, 6620 Invalid, 0 Unknown, 1209 Unchecked, 3471.33ms Time] [2021-11-13 17:42:25,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6463 states. [2021-11-13 17:42:25,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6463 to 3505. [2021-11-13 17:42:25,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3505 states, 3493 states have (on average 1.1294016604637847) internal successors, (3945), 3494 states have internal predecessors, (3945), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:25,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3505 states to 3505 states and 3955 transitions. [2021-11-13 17:42:25,249 INFO L78 Accepts]: Start accepts. Automaton has 3505 states and 3955 transitions. Word has length 131 [2021-11-13 17:42:25,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:42:25,249 INFO L470 AbstractCegarLoop]: Abstraction has 3505 states and 3955 transitions. [2021-11-13 17:42:25,249 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 75 states have (on average 4.133333333333334) internal successors, (310), 73 states have internal predecessors, (310), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:25,250 INFO L276 IsEmpty]: Start isEmpty. Operand 3505 states and 3955 transitions. [2021-11-13 17:42:25,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-13 17:42:25,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:42:25,254 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:42:25,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-13 17:42:25,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:42:25,479 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting substringErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:42:25,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:42:25,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1549600900, now seen corresponding path program 14 times [2021-11-13 17:42:25,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:42:25,480 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825862198] [2021-11-13 17:42:25,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:42:25,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:42:25,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:27,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:42:27,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:27,124 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 36 proven. 350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-13 17:42:27,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:42:27,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825862198] [2021-11-13 17:42:27,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825862198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:42:27,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021294099] [2021-11-13 17:42:27,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-13 17:42:27,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:42:27,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:42:27,126 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:42:27,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-13 17:42:27,253 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-13 17:42:27,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:42:27,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-13 17:42:27,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:42:27,762 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 21 treesize of output 17 [2021-11-13 17:42:28,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-13 17:42:28,373 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 36 proven. 259 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 17:42:28,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:42:28,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-13 17:42:28,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-13 17:42:29,177 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 36 proven. 259 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-13 17:42:29,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021294099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:42:29,178 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:42:29,178 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 25, 25] total 57 [2021-11-13 17:42:29,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872906184] [2021-11-13 17:42:29,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:42:29,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-13 17:42:29,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:42:29,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-13 17:42:29,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=3033, Unknown=0, NotChecked=0, Total=3192 [2021-11-13 17:42:29,179 INFO L87 Difference]: Start difference. First operand 3505 states and 3955 transitions. Second operand has 57 states, 54 states have (on average 3.5555555555555554) internal successors, (192), 53 states have internal predecessors, (192), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:39,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:42:39,748 INFO L93 Difference]: Finished difference Result 5657 states and 6322 transitions. [2021-11-13 17:42:39,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-13 17:42:39,749 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 54 states have (on average 3.5555555555555554) internal successors, (192), 53 states have internal predecessors, (192), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-11-13 17:42:39,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:42:39,754 INFO L225 Difference]: With dead ends: 5657 [2021-11-13 17:42:39,754 INFO L226 Difference]: Without dead ends: 5609 [2021-11-13 17:42:39,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 242 SyntacticMatches, 3 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 4 DeprecatedPredicates, 3640 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=829, Invalid=16463, Unknown=0, NotChecked=0, Total=17292 [2021-11-13 17:42:39,756 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 617 mSDsluCounter, 1505 mSDsCounter, 0 mSdLazyCounter, 9079 mSolverCounterSat, 117 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4300.76ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 617 SdHoareTripleChecker+Valid, 1598 SdHoareTripleChecker+Invalid, 9240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 27.10ms SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 9079 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 44 IncrementalHoareTripleChecker+Unchecked, 5101.78ms IncrementalHoareTripleChecker+Time [2021-11-13 17:42:39,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [617 Valid, 1598 Invalid, 9240 Unknown, 0 Unchecked, 27.10ms Time], IncrementalHoareTripleChecker [117 Valid, 9079 Invalid, 0 Unknown, 44 Unchecked, 5101.78ms Time] [2021-11-13 17:42:39,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5609 states. [2021-11-13 17:42:39,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5609 to 4578. [2021-11-13 17:42:39,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4578 states, 4563 states have (on average 1.1299583607275916) internal successors, (5156), 4564 states have internal predecessors, (5156), 12 states have call successors, (12), 12 states have call predecessors, (12), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:39,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4578 states to 4578 states and 5169 transitions. [2021-11-13 17:42:39,822 INFO L78 Accepts]: Start accepts. Automaton has 4578 states and 5169 transitions. Word has length 131 [2021-11-13 17:42:39,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:42:39,822 INFO L470 AbstractCegarLoop]: Abstraction has 4578 states and 5169 transitions. [2021-11-13 17:42:39,823 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 54 states have (on average 3.5555555555555554) internal successors, (192), 53 states have internal predecessors, (192), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:42:39,823 INFO L276 IsEmpty]: Start isEmpty. Operand 4578 states and 5169 transitions. [2021-11-13 17:42:39,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-13 17:42:39,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:42:39,828 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:42:39,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-13 17:42:40,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:42:40,055 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:42:40,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:42:40,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1248880560, now seen corresponding path program 34 times [2021-11-13 17:42:40,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:42:40,056 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697185207] [2021-11-13 17:42:40,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:42:40,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:42:40,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:40,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-13 17:42:40,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-13 17:42:40,657 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 40 proven. 327 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-13 17:42:40,658 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-13 17:42:40,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697185207] [2021-11-13 17:42:40,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697185207] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-13 17:42:40,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583341611] [2021-11-13 17:42:40,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-13 17:42:40,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-13 17:42:40,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 [2021-11-13 17:42:40,684 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-13 17:42:40,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-13 17:42:40,861 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-13 17:42:40,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-13 17:42:40,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-13 17:42:40,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-13 17:42:40,897 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-13 17:42:40,898 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-13 17:42:41,929 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 26 treesize of output 22 [2021-11-13 17:42:42,023 INFO L354 Elim1Store]: treesize reduction 41, result has 18.0 percent of original size [2021-11-13 17:42:42,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2021-11-13 17:42:51,226 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-13 17:42:51,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 48 [2021-11-13 17:42:51,237 INFO L354 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2021-11-13 17:42:51,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 34 [2021-11-13 17:42:51,306 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 290 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 17:42:51,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-13 17:42:54,651 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 56 treesize of output 52 [2021-11-13 17:42:56,351 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 279 proven. 89 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-13 17:42:56,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583341611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-13 17:42:56,352 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-13 17:42:56,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 26] total 75 [2021-11-13 17:42:56,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136278952] [2021-11-13 17:42:56,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-13 17:42:56,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-13 17:42:56,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-13 17:42:56,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-13 17:42:56,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=401, Invalid=5147, Unknown=2, NotChecked=0, Total=5550 [2021-11-13 17:42:56,353 INFO L87 Difference]: Start difference. First operand 4578 states and 5169 transitions. Second operand has 75 states, 73 states have (on average 4.657534246575342) internal successors, (340), 71 states have internal predecessors, (340), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:43:02,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-13 17:43:02,654 INFO L93 Difference]: Finished difference Result 7368 states and 8268 transitions. [2021-11-13 17:43:02,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-13 17:43:02,655 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 73 states have (on average 4.657534246575342) internal successors, (340), 71 states have internal predecessors, (340), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 135 [2021-11-13 17:43:02,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-13 17:43:02,660 INFO L225 Difference]: With dead ends: 7368 [2021-11-13 17:43:02,660 INFO L226 Difference]: Without dead ends: 6834 [2021-11-13 17:43:02,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 237 SyntacticMatches, 6 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2690 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=914, Invalid=12194, Unknown=2, NotChecked=0, Total=13110 [2021-11-13 17:43:02,662 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 290 mSDsluCounter, 1902 mSDsCounter, 0 mSdLazyCounter, 978 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 419.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 1965 SdHoareTripleChecker+Invalid, 1432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.19ms SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 415 IncrementalHoareTripleChecker+Unchecked, 523.35ms IncrementalHoareTripleChecker+Time [2021-11-13 17:43:02,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 1965 Invalid, 1432 Unknown, 0 Unchecked, 6.19ms Time], IncrementalHoareTripleChecker [39 Valid, 978 Invalid, 0 Unknown, 415 Unchecked, 523.35ms Time] [2021-11-13 17:43:02,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6834 states. [2021-11-13 17:43:02,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6834 to 6161. [2021-11-13 17:43:02,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6161 states, 6141 states have (on average 1.1255495847581827) internal successors, (6912), 6142 states have internal predecessors, (6912), 17 states have call successors, (17), 17 states have call predecessors, (17), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:43:02,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6161 states to 6161 states and 6930 transitions. [2021-11-13 17:43:02,780 INFO L78 Accepts]: Start accepts. Automaton has 6161 states and 6930 transitions. Word has length 135 [2021-11-13 17:43:02,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-13 17:43:02,780 INFO L470 AbstractCegarLoop]: Abstraction has 6161 states and 6930 transitions. [2021-11-13 17:43:02,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 73 states have (on average 4.657534246575342) internal successors, (340), 71 states have internal predecessors, (340), 4 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-13 17:43:02,780 INFO L276 IsEmpty]: Start isEmpty. Operand 6161 states and 6930 transitions. [2021-11-13 17:43:02,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-13 17:43:02,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-13 17:43:02,784 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-13 17:43:02,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-13 17:43:02,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf328689-e8fd-4f35-a7e8-7021d27b1ecc/bin/uautomizer-YU5uOKAj3y/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2021-11-13 17:43:02,985 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting substringErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 14 more)] === [2021-11-13 17:43:02,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-13 17:43:02,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1012453382, now seen corresponding path program 35 times [2021-11-13 17:43:02,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-13 17:43:02,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731855557] [2021-11-13 17:43:02,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-13 17:43:02,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-13 17:43:03,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat