./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:24:19,167 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:24:19,169 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:24:19,238 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:24:19,239 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:24:19,244 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:24:19,246 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:24:19,251 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:24:19,255 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:24:19,261 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:24:19,263 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:24:19,265 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:24:19,266 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:24:19,269 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:24:19,272 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:24:19,277 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:24:19,280 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:24:19,281 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:24:19,284 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:24:19,294 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:24:19,297 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:24:19,298 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:24:19,303 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:24:19,304 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:24:19,315 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:24:19,316 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:24:19,316 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:24:19,319 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:24:19,320 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:24:19,322 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:24:19,322 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:24:19,324 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:24:19,326 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:24:19,328 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:24:19,330 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:24:19,331 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:24:19,332 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:24:19,332 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:24:19,333 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:24:19,334 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:24:19,335 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:24:19,336 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:24:19,383 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:24:19,384 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:24:19,385 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:24:19,385 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:24:19,394 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:24:19,395 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:24:19,395 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:24:19,396 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:24:19,396 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:24:19,396 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:24:19,398 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:24:19,398 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:24:19,398 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:24:19,399 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:24:19,399 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:24:19,399 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:24:19,400 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:24:19,400 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:24:19,400 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:24:19,401 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:24:19,401 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:24:19,402 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:24:19,402 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:24:19,402 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:24:19,403 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:24:19,403 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:24:19,403 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:24:19,404 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:24:19,404 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:24:19,406 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_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2021-11-02 22:24:19,789 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:24:19,817 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:24:19,821 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:24:19,823 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:24:19,824 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:24:19,825 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-02 22:24:19,905 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/data/066e3d52c/8baac6aa040a460c96abdc1ea853a69a/FLAG639e79702 [2021-11-02 22:24:20,569 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:24:20,570 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-02 22:24:20,601 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/data/066e3d52c/8baac6aa040a460c96abdc1ea853a69a/FLAG639e79702 [2021-11-02 22:24:20,805 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/data/066e3d52c/8baac6aa040a460c96abdc1ea853a69a [2021-11-02 22:24:20,810 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:24:20,812 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:24:20,817 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:24:20,818 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:24:20,822 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:24:20,823 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:24:20" (1/1) ... [2021-11-02 22:24:20,825 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27f00cc7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:20, skipping insertion in model container [2021-11-02 22:24:20,826 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:24:20" (1/1) ... [2021-11-02 22:24:20,835 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:24:20,916 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:24:21,323 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:24:21,337 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:24:21,420 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:24:21,468 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:24:21,468 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21 WrapperNode [2021-11-02 22:24:21,468 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:24:21,469 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:24:21,470 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:24:21,470 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:24:21,484 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,526 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,527 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,564 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,574 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,588 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,595 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:24:21,596 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:24:21,596 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:24:21,596 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:24:21,597 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (1/1) ... [2021-11-02 22:24:21,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:24:21,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:21,642 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:24:21,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:24:21,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:24:21,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:24:21,684 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:24:21,684 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:24:21,684 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-02 22:24:21,685 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-02 22:24:21,685 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-02 22:24:21,686 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrlen [2021-11-02 22:24:21,686 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrncmp [2021-11-02 22:24:21,686 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrstr [2021-11-02 22:24:21,686 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:24:21,687 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:24:21,688 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:24:21,688 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:24:21,688 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:24:21,688 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:24:21,689 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:24:21,689 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:24:21,689 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:24:21,689 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:24:21,689 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:24:21,690 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:24:21,690 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:24:21,690 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:24:21,690 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:24:21,691 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:24:21,691 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:24:21,691 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:24:21,691 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:24:21,691 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-02 22:24:21,692 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-02 22:24:21,692 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-02 22:24:21,692 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:24:21,692 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:24:21,692 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:24:21,693 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:24:21,693 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:24:21,693 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:24:21,693 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:24:21,693 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:24:21,694 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:24:21,694 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:24:21,694 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:24:21,694 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:24:21,694 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:24:21,694 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:24:21,695 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:24:21,695 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:24:21,695 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:24:21,695 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:24:21,695 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:24:21,695 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:24:21,696 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:24:21,697 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:24:21,697 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:24:21,697 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:24:21,697 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:24:21,697 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:24:21,697 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:24:21,698 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:24:21,698 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:24:21,698 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:24:21,699 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:24:21,699 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:24:21,699 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:24:21,699 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:24:21,699 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:24:21,700 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:24:21,701 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:24:21,701 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:24:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:24:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:24:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:24:21,704 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:24:21,704 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:24:21,704 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:24:21,705 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:24:21,705 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:24:21,705 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:24:21,706 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:24:21,706 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:24:21,707 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:24:21,708 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:24:21,708 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:24:21,713 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:24:21,713 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:24:21,714 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:24:21,714 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:24:21,714 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:24:21,715 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:24:21,715 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:24:21,715 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:24:21,715 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:24:21,715 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:24:21,715 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:24:21,716 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:24:21,717 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:24:21,717 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:24:21,717 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:24:21,717 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:24:21,717 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:24:21,718 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:24:21,718 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:24:21,718 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:24:21,718 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:24:21,719 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:24:21,719 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:24:21,719 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:24:21,720 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:24:21,720 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:24:21,720 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:24:21,720 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:24:21,721 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:24:21,721 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-02 22:24:21,721 INFO L130 BoogieDeclarations]: Found specification of procedure cstrlen [2021-11-02 22:24:21,721 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:24:21,721 INFO L130 BoogieDeclarations]: Found specification of procedure cstrncmp [2021-11-02 22:24:21,721 INFO L130 BoogieDeclarations]: Found specification of procedure cstrstr [2021-11-02 22:24:21,722 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:24:21,722 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:24:21,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:24:21,723 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:24:21,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:24:21,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:24:22,349 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:24:22,350 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-02 22:24:22,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:24:22 BoogieIcfgContainer [2021-11-02 22:24:22,356 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:24:22,359 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:24:22,360 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:24:22,363 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:24:22,364 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:24:20" (1/3) ... [2021-11-02 22:24:22,365 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@318cdf13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:24:22, skipping insertion in model container [2021-11-02 22:24:22,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:24:21" (2/3) ... [2021-11-02 22:24:22,373 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@318cdf13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:24:22, skipping insertion in model container [2021-11-02 22:24:22,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:24:22" (3/3) ... [2021-11-02 22:24:22,375 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2021-11-02 22:24:22,385 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:24:22,385 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2021-11-02 22:24:22,447 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:24:22,455 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 22:24:22,456 INFO L340 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2021-11-02 22:24:22,478 INFO L276 IsEmpty]: Start isEmpty. Operand has 94 states, 58 states have (on average 1.7586206896551724) internal successors, (102), 83 states have internal predecessors, (102), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:24:22,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:24:22,486 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:22,487 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:22,487 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:22,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:22,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1159362034, now seen corresponding path program 1 times [2021-11-02 22:24:22,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:22,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597975768] [2021-11-02 22:24:22,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:22,517 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:22,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:22,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:22,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:22,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:24:22,886 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:22,886 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597975768] [2021-11-02 22:24:22,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597975768] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:22,888 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:22,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:24:22,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114360300] [2021-11-02 22:24:22,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:24:22,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:22,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:24:22,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:24:22,922 INFO L87 Difference]: Start difference. First operand has 94 states, 58 states have (on average 1.7586206896551724) internal successors, (102), 83 states have internal predecessors, (102), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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) [2021-11-02 22:24:23,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:23,275 INFO L93 Difference]: Finished difference Result 92 states and 104 transitions. [2021-11-02 22:24:23,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:24:23,277 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 [2021-11-02 22:24:23,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:23,287 INFO L225 Difference]: With dead ends: 92 [2021-11-02 22:24:23,287 INFO L226 Difference]: Without dead ends: 89 [2021-11-02 22:24:23,289 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:24:23,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-02 22:24:23,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-02 22:24:23,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 57 states have (on average 1.6140350877192982) internal successors, (92), 79 states have internal predecessors, (92), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:23,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2021-11-02 22:24:23,341 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 11 [2021-11-02 22:24:23,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:23,342 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2021-11-02 22:24:23,342 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) [2021-11-02 22:24:23,342 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2021-11-02 22:24:23,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:24:23,343 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:23,344 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:23,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:24:23,344 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:23,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:23,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1159362033, now seen corresponding path program 1 times [2021-11-02 22:24:23,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:23,346 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251592530] [2021-11-02 22:24:23,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:23,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:23,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:23,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:23,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:23,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:24:23,567 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:23,568 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251592530] [2021-11-02 22:24:23,568 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251592530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:23,568 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:23,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:24:23,569 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856528855] [2021-11-02 22:24:23,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:24:23,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:23,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:24:23,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:24:23,573 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 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) [2021-11-02 22:24:23,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:23,944 INFO L93 Difference]: Finished difference Result 93 states and 105 transitions. [2021-11-02 22:24:23,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:24:23,945 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 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 [2021-11-02 22:24:23,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:23,948 INFO L225 Difference]: With dead ends: 93 [2021-11-02 22:24:23,949 INFO L226 Difference]: Without dead ends: 93 [2021-11-02 22:24:23,950 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:24:23,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-02 22:24:23,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-11-02 22:24:23,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 59 states have (on average 1.5932203389830508) internal successors, (94), 81 states have internal predecessors, (94), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:23,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 103 transitions. [2021-11-02 22:24:23,971 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 103 transitions. Word has length 11 [2021-11-02 22:24:23,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:23,972 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 103 transitions. [2021-11-02 22:24:23,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 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) [2021-11-02 22:24:23,972 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 103 transitions. [2021-11-02 22:24:23,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:24:23,973 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:23,973 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:23,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:24:23,974 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:23,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:23,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1508818770, now seen corresponding path program 1 times [2021-11-02 22:24:23,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:23,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653019693] [2021-11-02 22:24:23,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:23,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:24,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:24,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:24,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:24,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:24:24,139 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:24,139 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653019693] [2021-11-02 22:24:24,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653019693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:24,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943486257] [2021-11-02 22:24:24,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:24,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:24,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:24,142 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:24,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:24:24,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:24,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:24:24,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:24,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:24:24,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943486257] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:24,563 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:24:24,563 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-02 22:24:24,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889475699] [2021-11-02 22:24:24,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:24:24,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:24,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:24:24,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:24,566 INFO L87 Difference]: Start difference. First operand 91 states and 103 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:24,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:24,646 INFO L93 Difference]: Finished difference Result 114 states and 128 transitions. [2021-11-02 22:24:24,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:24:24,647 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-11-02 22:24:24,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:24,651 INFO L225 Difference]: With dead ends: 114 [2021-11-02 22:24:24,651 INFO L226 Difference]: Without dead ends: 114 [2021-11-02 22:24:24,651 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:24,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-02 22:24:24,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 98. [2021-11-02 22:24:24,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 66 states have (on average 1.5454545454545454) internal successors, (102), 88 states have internal predecessors, (102), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:24,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 111 transitions. [2021-11-02 22:24:24,679 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 111 transitions. Word has length 15 [2021-11-02 22:24:24,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:24,679 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 111 transitions. [2021-11-02 22:24:24,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:24,680 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 111 transitions. [2021-11-02 22:24:24,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-02 22:24:24,683 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:24,683 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:24,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:24,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:24,902 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:24,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:24,903 INFO L85 PathProgramCache]: Analyzing trace with hash -2106090156, now seen corresponding path program 1 times [2021-11-02 22:24:24,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:24,903 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81817413] [2021-11-02 22:24:24,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:24,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:24,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:25,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:25,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:25,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:24:25,075 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:25,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81817413] [2021-11-02 22:24:25,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81817413] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:25,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028980795] [2021-11-02 22:24:25,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:25,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:25,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:25,081 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:25,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:24:25,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:25,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 22:24:25,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:25,382 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:24:25,383 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 [2021-11-02 22:24:25,396 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 15 treesize of output 13 [2021-11-02 22:24:25,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:24:25,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028980795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:25,534 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:25,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-02 22:24:25,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088105054] [2021-11-02 22:24:25,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:24:25,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:25,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:24:25,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:24:25,537 INFO L87 Difference]: Start difference. First operand 98 states and 111 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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) [2021-11-02 22:24:25,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:25,894 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2021-11-02 22:24:25,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:24:25,894 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 [2021-11-02 22:24:25,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:25,896 INFO L225 Difference]: With dead ends: 99 [2021-11-02 22:24:25,896 INFO L226 Difference]: Without dead ends: 99 [2021-11-02 22:24:25,896 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:25,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-02 22:24:25,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2021-11-02 22:24:25,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 65 states have (on average 1.5384615384615385) internal successors, (100), 86 states have internal predecessors, (100), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:25,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 109 transitions. [2021-11-02 22:24:25,904 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 109 transitions. Word has length 15 [2021-11-02 22:24:25,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:25,904 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 109 transitions. [2021-11-02 22:24:25,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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) [2021-11-02 22:24:25,905 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 109 transitions. [2021-11-02 22:24:25,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:24:25,905 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:25,906 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:25,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:26,131 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:26,132 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr2REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:26,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:26,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1724157827, now seen corresponding path program 1 times [2021-11-02 22:24:26,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:26,133 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928378253] [2021-11-02 22:24:26,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:26,133 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:26,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:26,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:26,202 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:26,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928378253] [2021-11-02 22:24:26,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928378253] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:26,204 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:26,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:24:26,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707651355] [2021-11-02 22:24:26,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:24:26,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:26,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:24:26,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:24:26,206 INFO L87 Difference]: Start difference. First operand 96 states and 109 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:26,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:26,386 INFO L93 Difference]: Finished difference Result 94 states and 107 transitions. [2021-11-02 22:24:26,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:24:26,387 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 17 [2021-11-02 22:24:26,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:26,388 INFO L225 Difference]: With dead ends: 94 [2021-11-02 22:24:26,388 INFO L226 Difference]: Without dead ends: 94 [2021-11-02 22:24:26,389 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:24:26,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-02 22:24:26,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-11-02 22:24:26,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 65 states have (on average 1.5076923076923077) internal successors, (98), 84 states have internal predecessors, (98), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:26,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 107 transitions. [2021-11-02 22:24:26,396 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 107 transitions. Word has length 17 [2021-11-02 22:24:26,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:26,397 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 107 transitions. [2021-11-02 22:24:26,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:26,398 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 107 transitions. [2021-11-02 22:24:26,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-02 22:24:26,398 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:26,399 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:26,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:24:26,399 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:26,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:26,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1724157826, now seen corresponding path program 1 times [2021-11-02 22:24:26,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:26,400 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920396117] [2021-11-02 22:24:26,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:26,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:26,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,507 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:26,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:26,520 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:26,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920396117] [2021-11-02 22:24:26,522 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920396117] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:26,522 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:26,522 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:24:26,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630493530] [2021-11-02 22:24:26,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:24:26,523 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:26,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:24:26,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:24:26,524 INFO L87 Difference]: Start difference. First operand 94 states and 107 transitions. Second operand has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:26,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:26,748 INFO L93 Difference]: Finished difference Result 97 states and 110 transitions. [2021-11-02 22:24:26,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:24:26,748 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 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 17 [2021-11-02 22:24:26,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:26,750 INFO L225 Difference]: With dead ends: 97 [2021-11-02 22:24:26,750 INFO L226 Difference]: Without dead ends: 97 [2021-11-02 22:24:26,750 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:26,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-02 22:24:26,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 95. [2021-11-02 22:24:26,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 67 states have (on average 1.4776119402985075) internal successors, (99), 85 states have internal predecessors, (99), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:26,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 108 transitions. [2021-11-02 22:24:26,758 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 108 transitions. Word has length 17 [2021-11-02 22:24:26,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:26,759 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 108 transitions. [2021-11-02 22:24:26,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:26,759 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 108 transitions. [2021-11-02 22:24:26,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:24:26,760 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:26,760 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:26,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:24:26,761 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:26,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:26,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1257878847, now seen corresponding path program 1 times [2021-11-02 22:24:26,761 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:26,762 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234536711] [2021-11-02 22:24:26,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:26,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:26,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:26,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,828 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:26,828 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:26,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234536711] [2021-11-02 22:24:26,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234536711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:26,829 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914362036] [2021-11-02 22:24:26,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:26,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:26,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:26,831 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:26,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:24:26,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:26,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:24:26,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:27,086 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:27,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914362036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:27,087 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:24:27,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-02 22:24:27,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765247834] [2021-11-02 22:24:27,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:24:27,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:27,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:24:27,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:27,091 INFO L87 Difference]: Start difference. First operand 95 states and 108 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:27,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:27,124 INFO L93 Difference]: Finished difference Result 120 states and 134 transitions. [2021-11-02 22:24:27,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:24:27,125 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-11-02 22:24:27,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:27,128 INFO L225 Difference]: With dead ends: 120 [2021-11-02 22:24:27,128 INFO L226 Difference]: Without dead ends: 120 [2021-11-02 22:24:27,128 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:27,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-02 22:24:27,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 113. [2021-11-02 22:24:27,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 85 states have (on average 1.388235294117647) internal successors, (118), 103 states have internal predecessors, (118), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:27,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 127 transitions. [2021-11-02 22:24:27,153 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 127 transitions. Word has length 21 [2021-11-02 22:24:27,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:27,154 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 127 transitions. [2021-11-02 22:24:27,154 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:27,154 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 127 transitions. [2021-11-02 22:24:27,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:24:27,155 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:27,155 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:27,201 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:27,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:27,370 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr5REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:27,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:27,370 INFO L85 PathProgramCache]: Analyzing trace with hash -1257878900, now seen corresponding path program 1 times [2021-11-02 22:24:27,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:27,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49757626] [2021-11-02 22:24:27,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:27,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:27,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:27,491 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:27,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:27,497 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:27,497 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:27,498 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49757626] [2021-11-02 22:24:27,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49757626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:27,498 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26073396] [2021-11-02 22:24:27,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:27,498 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:27,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:27,500 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:27,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:24:27,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:27,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:24:27,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:27,995 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:27,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26073396] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:27,995 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:27,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2021-11-02 22:24:27,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940497368] [2021-11-02 22:24:27,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:24:27,996 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:27,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:24:27,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:24:27,997 INFO L87 Difference]: Start difference. First operand 113 states and 127 transitions. Second operand has 9 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 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) [2021-11-02 22:24:28,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:28,371 INFO L93 Difference]: Finished difference Result 133 states and 148 transitions. [2021-11-02 22:24:28,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:24:28,372 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 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 21 [2021-11-02 22:24:28,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:28,373 INFO L225 Difference]: With dead ends: 133 [2021-11-02 22:24:28,373 INFO L226 Difference]: Without dead ends: 133 [2021-11-02 22:24:28,374 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:24:28,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-02 22:24:28,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 127. [2021-11-02 22:24:28,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 99 states have (on average 1.3535353535353536) internal successors, (134), 117 states have internal predecessors, (134), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:28,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 143 transitions. [2021-11-02 22:24:28,381 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 143 transitions. Word has length 21 [2021-11-02 22:24:28,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:28,381 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 143 transitions. [2021-11-02 22:24:28,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.0) internal successors, (32), 8 states have internal predecessors, (32), 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) [2021-11-02 22:24:28,382 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 143 transitions. [2021-11-02 22:24:28,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:24:28,383 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:28,383 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:28,420 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:28,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:28,602 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:28,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:28,603 INFO L85 PathProgramCache]: Analyzing trace with hash 2025971199, now seen corresponding path program 1 times [2021-11-02 22:24:28,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:28,603 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993785879] [2021-11-02 22:24:28,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:28,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:28,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:28,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:28,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:28,745 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:28,746 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:28,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993785879] [2021-11-02 22:24:28,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993785879] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:28,746 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341708407] [2021-11-02 22:24:28,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:28,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:28,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:28,750 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:28,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:24:28,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:28,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:24:28,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:28,956 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:24:28,957 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 [2021-11-02 22:24:29,105 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:29,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341708407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:29,106 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:29,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-11-02 22:24:29,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305268375] [2021-11-02 22:24:29,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:24:29,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:29,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:24:29,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:29,108 INFO L87 Difference]: Start difference. First operand 127 states and 143 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 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) [2021-11-02 22:24:29,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:29,378 INFO L93 Difference]: Finished difference Result 130 states and 145 transitions. [2021-11-02 22:24:29,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:24:29,379 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 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 21 [2021-11-02 22:24:29,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:29,380 INFO L225 Difference]: With dead ends: 130 [2021-11-02 22:24:29,380 INFO L226 Difference]: Without dead ends: 130 [2021-11-02 22:24:29,381 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:24:29,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-02 22:24:29,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 124. [2021-11-02 22:24:29,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 114 states have internal predecessors, (130), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:29,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 139 transitions. [2021-11-02 22:24:29,387 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 139 transitions. Word has length 21 [2021-11-02 22:24:29,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:29,387 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 139 transitions. [2021-11-02 22:24:29,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 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) [2021-11-02 22:24:29,388 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 139 transitions. [2021-11-02 22:24:29,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-02 22:24:29,389 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:29,389 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:29,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:29,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-02 22:24:29,598 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr5REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:29,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:29,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1757224718, now seen corresponding path program 1 times [2021-11-02 22:24:29,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:29,599 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757710221] [2021-11-02 22:24:29,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:29,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:29,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:29,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:29,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:29,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:29,737 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:29,737 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757710221] [2021-11-02 22:24:29,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757710221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:29,738 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:29,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:24:29,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608804370] [2021-11-02 22:24:29,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:24:29,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:29,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:24:29,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:29,739 INFO L87 Difference]: Start difference. First operand 124 states and 139 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:30,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:30,095 INFO L93 Difference]: Finished difference Result 123 states and 138 transitions. [2021-11-02 22:24:30,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:24:30,096 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 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 21 [2021-11-02 22:24:30,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:30,097 INFO L225 Difference]: With dead ends: 123 [2021-11-02 22:24:30,098 INFO L226 Difference]: Without dead ends: 123 [2021-11-02 22:24:30,098 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:24:30,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-02 22:24:30,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 110. [2021-11-02 22:24:30,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 84 states have (on average 1.369047619047619) internal successors, (115), 100 states have internal predecessors, (115), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:30,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 124 transitions. [2021-11-02 22:24:30,103 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 124 transitions. Word has length 21 [2021-11-02 22:24:30,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:30,103 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 124 transitions. [2021-11-02 22:24:30,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:30,103 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 124 transitions. [2021-11-02 22:24:30,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:24:30,104 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:30,105 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:30,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:24:30,105 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting cstrstrErr0REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:30,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:30,112 INFO L85 PathProgramCache]: Analyzing trace with hash -593572000, now seen corresponding path program 1 times [2021-11-02 22:24:30,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:30,113 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657989503] [2021-11-02 22:24:30,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:30,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:30,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:30,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:30,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:30,196 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:30,196 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:30,196 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657989503] [2021-11-02 22:24:30,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657989503] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:30,197 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:30,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:24:30,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471855503] [2021-11-02 22:24:30,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:24:30,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:30,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:24:30,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:24:30,199 INFO L87 Difference]: Start difference. First operand 110 states and 124 transitions. Second operand has 6 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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) [2021-11-02 22:24:30,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:30,450 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2021-11-02 22:24:30,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:24:30,451 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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 25 [2021-11-02 22:24:30,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:30,452 INFO L225 Difference]: With dead ends: 109 [2021-11-02 22:24:30,452 INFO L226 Difference]: Without dead ends: 109 [2021-11-02 22:24:30,452 INFO L786 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 [2021-11-02 22:24:30,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-02 22:24:30,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-11-02 22:24:30,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 84 states have (on average 1.3571428571428572) internal successors, (114), 99 states have internal predecessors, (114), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:30,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 123 transitions. [2021-11-02 22:24:30,457 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 123 transitions. Word has length 25 [2021-11-02 22:24:30,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:30,457 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 123 transitions. [2021-11-02 22:24:30,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 4 states have internal predecessors, (21), 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) [2021-11-02 22:24:30,457 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 123 transitions. [2021-11-02 22:24:30,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:24:30,459 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:30,459 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:30,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-02 22:24:30,459 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting cstrstrErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:30,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:30,460 INFO L85 PathProgramCache]: Analyzing trace with hash -593571999, now seen corresponding path program 1 times [2021-11-02 22:24:30,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:30,460 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23683623] [2021-11-02 22:24:30,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:30,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:30,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:30,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:30,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:30,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:24:30,557 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:30,558 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23683623] [2021-11-02 22:24:30,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23683623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:30,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:30,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:24:30,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074315619] [2021-11-02 22:24:30,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:24:30,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:30,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:24:30,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:30,560 INFO L87 Difference]: Start difference. First operand 109 states and 123 transitions. Second operand has 8 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-11-02 22:24:30,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:30,863 INFO L93 Difference]: Finished difference Result 108 states and 122 transitions. [2021-11-02 22:24:30,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:24:30,863 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 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 25 [2021-11-02 22:24:30,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:30,864 INFO L225 Difference]: With dead ends: 108 [2021-11-02 22:24:30,864 INFO L226 Difference]: Without dead ends: 108 [2021-11-02 22:24:30,865 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:24:30,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-02 22:24:30,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2021-11-02 22:24:30,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 84 states have (on average 1.3452380952380953) internal successors, (113), 98 states have internal predecessors, (113), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:30,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 122 transitions. [2021-11-02 22:24:30,870 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 122 transitions. Word has length 25 [2021-11-02 22:24:30,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:30,870 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 122 transitions. [2021-11-02 22:24:30,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-11-02 22:24:30,871 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 122 transitions. [2021-11-02 22:24:30,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:24:30,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:30,872 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:30,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-02 22:24:30,872 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting cstrlenErr0REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:30,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:30,873 INFO L85 PathProgramCache]: Analyzing trace with hash 872193985, now seen corresponding path program 1 times [2021-11-02 22:24:30,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:30,873 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919105310] [2021-11-02 22:24:30,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:30,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:30,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:30,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:30,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:30,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:24:30,933 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:30,933 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919105310] [2021-11-02 22:24:30,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919105310] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:30,933 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:30,934 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:24:30,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255599655] [2021-11-02 22:24:30,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:24:30,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:30,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:24:30,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:24:30,935 INFO L87 Difference]: Start difference. First operand 108 states and 122 transitions. Second operand has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:31,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:31,223 INFO L93 Difference]: Finished difference Result 107 states and 121 transitions. [2021-11-02 22:24:31,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:24:31,224 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-02 22:24:31,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:31,225 INFO L225 Difference]: With dead ends: 107 [2021-11-02 22:24:31,225 INFO L226 Difference]: Without dead ends: 107 [2021-11-02 22:24:31,226 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:24:31,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-02 22:24:31,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-02 22:24:31,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 84 states have (on average 1.3333333333333333) internal successors, (112), 97 states have internal predecessors, (112), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:31,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 121 transitions. [2021-11-02 22:24:31,230 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 121 transitions. Word has length 30 [2021-11-02 22:24:31,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:31,230 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 121 transitions. [2021-11-02 22:24:31,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:31,231 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 121 transitions. [2021-11-02 22:24:31,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:24:31,231 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:31,231 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:31,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-02 22:24:31,232 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting cstrlenErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:31,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:31,232 INFO L85 PathProgramCache]: Analyzing trace with hash 872193986, now seen corresponding path program 1 times [2021-11-02 22:24:31,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:31,232 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452473254] [2021-11-02 22:24:31,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:31,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:31,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:31,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:31,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:31,443 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:24:31,445 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:31,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452473254] [2021-11-02 22:24:31,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452473254] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:31,445 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:31,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:24:31,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718585077] [2021-11-02 22:24:31,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:24:31,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:31,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:24:31,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:24:31,448 INFO L87 Difference]: Start difference. First operand 107 states and 121 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 3 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) [2021-11-02 22:24:31,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:31,880 INFO L93 Difference]: Finished difference Result 123 states and 136 transitions. [2021-11-02 22:24:31,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:24:31,881 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 3 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) Word has length 30 [2021-11-02 22:24:31,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:31,884 INFO L225 Difference]: With dead ends: 123 [2021-11-02 22:24:31,884 INFO L226 Difference]: Without dead ends: 123 [2021-11-02 22:24:31,884 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:24:31,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-02 22:24:31,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2021-11-02 22:24:31,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 92 states have (on average 1.3043478260869565) internal successors, (120), 106 states have internal predecessors, (120), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:24:31,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 131 transitions. [2021-11-02 22:24:31,893 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 131 transitions. Word has length 30 [2021-11-02 22:24:31,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:31,894 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 131 transitions. [2021-11-02 22:24:31,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 3 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) [2021-11-02 22:24:31,894 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 131 transitions. [2021-11-02 22:24:31,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:24:31,899 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:31,899 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:31,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-02 22:24:31,900 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting cstrlenErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:31,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:31,900 INFO L85 PathProgramCache]: Analyzing trace with hash -933244348, now seen corresponding path program 1 times [2021-11-02 22:24:31,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:31,901 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464169937] [2021-11-02 22:24:31,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:31,901 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:31,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:32,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:32,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:32,176 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:32,176 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:32,176 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464169937] [2021-11-02 22:24:32,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464169937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:32,177 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689701843] [2021-11-02 22:24:32,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:32,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:32,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:32,177 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:32,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:24:32,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:32,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-02 22:24:32,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:32,600 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 [2021-11-02 22:24:32,891 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-02 22:24:32,892 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 25 [2021-11-02 22:24:32,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:32,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689701843] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:32,923 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:32,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 20 [2021-11-02 22:24:32,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505058237] [2021-11-02 22:24:32,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:24:32,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:32,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:24:32,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:24:32,925 INFO L87 Difference]: Start difference. First operand 117 states and 131 transitions. Second operand has 20 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 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) [2021-11-02 22:24:33,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:33,961 INFO L93 Difference]: Finished difference Result 140 states and 154 transitions. [2021-11-02 22:24:33,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:24:33,961 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 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 30 [2021-11-02 22:24:33,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:33,963 INFO L225 Difference]: With dead ends: 140 [2021-11-02 22:24:33,963 INFO L226 Difference]: Without dead ends: 140 [2021-11-02 22:24:33,964 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=146, Invalid=724, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:24:33,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-11-02 22:24:33,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 121. [2021-11-02 22:24:33,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 96 states have (on average 1.3020833333333333) internal successors, (125), 110 states have internal predecessors, (125), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:24:33,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 136 transitions. [2021-11-02 22:24:33,972 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 136 transitions. Word has length 30 [2021-11-02 22:24:33,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:33,973 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 136 transitions. [2021-11-02 22:24:33,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 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) [2021-11-02 22:24:33,973 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 136 transitions. [2021-11-02 22:24:33,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:24:33,974 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:33,974 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:34,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:34,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-02 22:24:34,175 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:34,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:34,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1648961659, now seen corresponding path program 1 times [2021-11-02 22:24:34,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:34,176 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936401705] [2021-11-02 22:24:34,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:34,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:34,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:34,254 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:34,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:34,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-11-02 22:24:34,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:34,266 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:24:34,267 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:34,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936401705] [2021-11-02 22:24:34,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936401705] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:34,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:34,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:24:34,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245090656] [2021-11-02 22:24:34,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:24:34,268 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:34,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:24:34,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:24:34,269 INFO L87 Difference]: Start difference. First operand 121 states and 136 transitions. Second operand has 5 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 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) [2021-11-02 22:24:34,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:34,396 INFO L93 Difference]: Finished difference Result 120 states and 135 transitions. [2021-11-02 22:24:34,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:24:34,397 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 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 32 [2021-11-02 22:24:34,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:34,398 INFO L225 Difference]: With dead ends: 120 [2021-11-02 22:24:34,398 INFO L226 Difference]: Without dead ends: 86 [2021-11-02 22:24:34,398 INFO L786 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 [2021-11-02 22:24:34,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-02 22:24:34,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2021-11-02 22:24:34,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 65 states have (on average 1.3384615384615384) internal successors, (87), 77 states have internal predecessors, (87), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:24:34,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2021-11-02 22:24:34,403 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 32 [2021-11-02 22:24:34,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:34,405 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2021-11-02 22:24:34,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 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) [2021-11-02 22:24:34,405 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2021-11-02 22:24:34,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-02 22:24:34,405 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:34,406 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:34,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-02 22:24:34,406 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting cstrlenErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:34,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:34,406 INFO L85 PathProgramCache]: Analyzing trace with hash 2110909409, now seen corresponding path program 2 times [2021-11-02 22:24:34,407 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:34,407 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857202253] [2021-11-02 22:24:34,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:34,407 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:34,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:34,642 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:34,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:34,646 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:34,646 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:34,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857202253] [2021-11-02 22:24:34,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857202253] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:34,646 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425996566] [2021-11-02 22:24:34,646 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:24:34,647 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:34,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:34,648 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:34,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:24:34,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:24:34,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:24:34,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:24:34,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:34,975 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 [2021-11-02 22:24:35,224 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:24:35,225 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 35 treesize of output 35 [2021-11-02 22:24:35,443 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:24:35,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425996566] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:35,443 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:24:35,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [12] total 18 [2021-11-02 22:24:35,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190532986] [2021-11-02 22:24:35,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:24:35,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:35,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:24:35,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:24:35,445 INFO L87 Difference]: Start difference. First operand 86 states and 95 transitions. Second operand has 11 states, 8 states have (on average 3.125) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:35,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:35,964 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2021-11-02 22:24:35,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:24:35,965 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 3.125) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-11-02 22:24:35,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:35,966 INFO L225 Difference]: With dead ends: 92 [2021-11-02 22:24:35,967 INFO L226 Difference]: Without dead ends: 92 [2021-11-02 22:24:35,967 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:24:35,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-02 22:24:35,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2021-11-02 22:24:35,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 66 states have (on average 1.3333333333333333) internal successors, (88), 78 states have internal predecessors, (88), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:24:35,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 96 transitions. [2021-11-02 22:24:35,978 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 96 transitions. Word has length 34 [2021-11-02 22:24:35,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:35,978 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 96 transitions. [2021-11-02 22:24:35,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 3.125) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:35,979 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 96 transitions. [2021-11-02 22:24:35,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:24:35,980 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:35,981 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:36,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:36,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:24:36,194 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting cstrlenErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:36,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:36,194 INFO L85 PathProgramCache]: Analyzing trace with hash -808876934, now seen corresponding path program 1 times [2021-11-02 22:24:36,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:36,195 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839893039] [2021-11-02 22:24:36,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:36,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:36,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:36,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:36,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:36,571 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:36,571 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:36,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839893039] [2021-11-02 22:24:36,572 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839893039] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:36,572 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054893279] [2021-11-02 22:24:36,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:36,573 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:36,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:36,574 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:36,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:24:36,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:36,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:24:36,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:37,175 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 [2021-11-02 22:24:37,534 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 [2021-11-02 22:24:37,542 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:37,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054893279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:37,542 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:37,542 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 26 [2021-11-02 22:24:37,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813475159] [2021-11-02 22:24:37,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:24:37,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:37,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:24:37,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:24:37,545 INFO L87 Difference]: Start difference. First operand 87 states and 96 transitions. Second operand has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 22 states have internal predecessors, (55), 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) [2021-11-02 22:24:38,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:38,445 INFO L93 Difference]: Finished difference Result 120 states and 132 transitions. [2021-11-02 22:24:38,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:24:38,445 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 22 states have internal predecessors, (55), 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 37 [2021-11-02 22:24:38,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:38,447 INFO L225 Difference]: With dead ends: 120 [2021-11-02 22:24:38,447 INFO L226 Difference]: Without dead ends: 120 [2021-11-02 22:24:38,448 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=173, Invalid=1159, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:24:38,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-02 22:24:38,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 105. [2021-11-02 22:24:38,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 81 states have (on average 1.2839506172839505) internal successors, (104), 94 states have internal predecessors, (104), 7 states have call successors, (7), 7 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:38,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 115 transitions. [2021-11-02 22:24:38,452 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 115 transitions. Word has length 37 [2021-11-02 22:24:38,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:38,453 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 115 transitions. [2021-11-02 22:24:38,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 22 states have internal predecessors, (55), 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) [2021-11-02 22:24:38,453 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 115 transitions. [2021-11-02 22:24:38,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:24:38,453 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:38,454 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:38,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:38,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-02 22:24:38,670 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting cstrlenErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:38,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:38,670 INFO L85 PathProgramCache]: Analyzing trace with hash 680644669, now seen corresponding path program 2 times [2021-11-02 22:24:38,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:38,670 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187271045] [2021-11-02 22:24:38,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:38,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:38,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:38,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:38,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:38,935 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:38,936 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:38,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187271045] [2021-11-02 22:24:38,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187271045] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:38,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075592885] [2021-11-02 22:24:38,937 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:24:38,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:38,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:38,946 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:38,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:24:39,174 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:24:39,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:24:39,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-02 22:24:39,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:39,514 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:39,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075592885] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:39,514 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:39,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2021-11-02 22:24:39,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979850757] [2021-11-02 22:24:39,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:24:39,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:39,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:24:39,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:24:39,519 INFO L87 Difference]: Start difference. First operand 105 states and 115 transitions. Second operand has 22 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 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) [2021-11-02 22:24:40,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:40,530 INFO L93 Difference]: Finished difference Result 128 states and 142 transitions. [2021-11-02 22:24:40,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:24:40,530 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 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 [2021-11-02 22:24:40,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:40,532 INFO L225 Difference]: With dead ends: 128 [2021-11-02 22:24:40,532 INFO L226 Difference]: Without dead ends: 128 [2021-11-02 22:24:40,533 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=111, Invalid=701, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:24:40,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-02 22:24:40,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 108. [2021-11-02 22:24:40,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 84 states have (on average 1.2857142857142858) internal successors, (108), 97 states have internal predecessors, (108), 7 states have call successors, (7), 7 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:40,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 119 transitions. [2021-11-02 22:24:40,543 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 119 transitions. Word has length 41 [2021-11-02 22:24:40,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:40,544 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 119 transitions. [2021-11-02 22:24:40,544 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 3.210526315789474) internal successors, (61), 18 states have internal predecessors, (61), 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) [2021-11-02 22:24:40,544 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 119 transitions. [2021-11-02 22:24:40,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:24:40,545 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:40,545 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:40,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:40,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:40,768 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting cstrstrErr2REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:40,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:40,769 INFO L85 PathProgramCache]: Analyzing trace with hash -661416091, now seen corresponding path program 1 times [2021-11-02 22:24:40,769 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:40,769 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538475671] [2021-11-02 22:24:40,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:40,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:40,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:40,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:40,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:40,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 22:24:40,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:40,855 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:40,855 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:40,855 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538475671] [2021-11-02 22:24:40,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538475671] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:40,856 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:40,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:24:40,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602832390] [2021-11-02 22:24:40,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:24:40,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:40,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:24:40,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:24:40,858 INFO L87 Difference]: Start difference. First operand 108 states and 119 transitions. Second operand has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 5 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:24:41,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:41,074 INFO L93 Difference]: Finished difference Result 107 states and 118 transitions. [2021-11-02 22:24:41,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:24:41,075 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 5 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 42 [2021-11-02 22:24:41,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:41,076 INFO L225 Difference]: With dead ends: 107 [2021-11-02 22:24:41,076 INFO L226 Difference]: Without dead ends: 107 [2021-11-02 22:24:41,076 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:24:41,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-11-02 22:24:41,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-11-02 22:24:41,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 84 states have (on average 1.2738095238095237) internal successors, (107), 96 states have internal predecessors, (107), 7 states have call successors, (7), 7 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:41,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 118 transitions. [2021-11-02 22:24:41,082 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 118 transitions. Word has length 42 [2021-11-02 22:24:41,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:41,083 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 118 transitions. [2021-11-02 22:24:41,083 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 5 states have internal predecessors, (32), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:24:41,083 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 118 transitions. [2021-11-02 22:24:41,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:24:41,084 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:41,084 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:41,084 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 22:24:41,085 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:41,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:41,085 INFO L85 PathProgramCache]: Analyzing trace with hash -661416090, now seen corresponding path program 1 times [2021-11-02 22:24:41,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:41,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879932604] [2021-11-02 22:24:41,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:41,086 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:41,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:41,203 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:41,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:41,207 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 22:24:41,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:41,217 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:41,217 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:41,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879932604] [2021-11-02 22:24:41,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879932604] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:41,218 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379702840] [2021-11-02 22:24:41,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:41,218 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:41,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:41,222 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:41,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:24:41,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:41,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-02 22:24:41,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:41,914 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:41,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379702840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:41,914 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:41,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 14 [2021-11-02 22:24:41,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568556174] [2021-11-02 22:24:41,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-02 22:24:41,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:41,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-02 22:24:41,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:24:41,916 INFO L87 Difference]: Start difference. First operand 107 states and 118 transitions. Second operand has 15 states, 14 states have (on average 4.285714285714286) internal successors, (60), 12 states have internal predecessors, (60), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:24:46,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:46,418 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2021-11-02 22:24:46,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:24:46,418 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 4.285714285714286) internal successors, (60), 12 states have internal predecessors, (60), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 42 [2021-11-02 22:24:46,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:46,419 INFO L225 Difference]: With dead ends: 115 [2021-11-02 22:24:46,419 INFO L226 Difference]: Without dead ends: 115 [2021-11-02 22:24:46,420 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=327, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:24:46,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-02 22:24:46,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 110. [2021-11-02 22:24:46,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 87 states have (on average 1.264367816091954) internal successors, (110), 99 states have internal predecessors, (110), 7 states have call successors, (7), 7 states have call predecessors, (7), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-02 22:24:46,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 121 transitions. [2021-11-02 22:24:46,425 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 121 transitions. Word has length 42 [2021-11-02 22:24:46,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:46,426 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 121 transitions. [2021-11-02 22:24:46,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 4.285714285714286) internal successors, (60), 12 states have internal predecessors, (60), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:24:46,426 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 121 transitions. [2021-11-02 22:24:46,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:24:46,427 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:46,427 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1] [2021-11-02 22:24:46,454 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:46,633 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-02 22:24:46,634 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting cstrlenErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:46,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:46,634 INFO L85 PathProgramCache]: Analyzing trace with hash 544797342, now seen corresponding path program 3 times [2021-11-02 22:24:46,634 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:46,634 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771310803] [2021-11-02 22:24:46,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:46,635 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:46,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:46,915 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:46,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:46,919 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:24:46,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:46,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771310803] [2021-11-02 22:24:46,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771310803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:46,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474970868] [2021-11-02 22:24:46,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:24:46,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:46,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:46,921 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:46,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:24:47,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:24:47,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:24:47,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:24:47,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:47,297 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:24:47,297 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 [2021-11-02 22:24:47,487 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 [2021-11-02 22:24:47,989 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:24:47,990 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 26 treesize of output 26 [2021-11-02 22:24:48,156 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:24:48,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474970868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:48,156 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:48,156 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 32 [2021-11-02 22:24:48,157 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240131219] [2021-11-02 22:24:48,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 22:24:48,158 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:48,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 22:24:48,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=913, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:24:48,160 INFO L87 Difference]: Start difference. First operand 110 states and 121 transitions. Second operand has 32 states, 30 states have (on average 2.3) internal successors, (69), 27 states have internal predecessors, (69), 5 states have call successors, (7), 6 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:51,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:51,458 INFO L93 Difference]: Finished difference Result 155 states and 171 transitions. [2021-11-02 22:24:51,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-02 22:24:51,467 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 2.3) internal successors, (69), 27 states have internal predecessors, (69), 5 states have call successors, (7), 6 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-11-02 22:24:51,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:51,469 INFO L225 Difference]: With dead ends: 155 [2021-11-02 22:24:51,469 INFO L226 Difference]: Without dead ends: 155 [2021-11-02 22:24:51,471 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 934 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=399, Invalid=3633, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:24:51,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-02 22:24:51,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 126. [2021-11-02 22:24:51,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 101 states have (on average 1.2277227722772277) internal successors, (124), 113 states have internal predecessors, (124), 9 states have call successors, (9), 9 states have call predecessors, (9), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:24:51,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 138 transitions. [2021-11-02 22:24:51,479 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 138 transitions. Word has length 44 [2021-11-02 22:24:51,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:51,479 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 138 transitions. [2021-11-02 22:24:51,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 2.3) internal successors, (69), 27 states have internal predecessors, (69), 5 states have call successors, (7), 6 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:24:51,480 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 138 transitions. [2021-11-02 22:24:51,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-02 22:24:51,481 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:51,481 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:51,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:51,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:51,706 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:51,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:51,706 INFO L85 PathProgramCache]: Analyzing trace with hash -483133633, now seen corresponding path program 1 times [2021-11-02 22:24:51,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:51,707 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595685826] [2021-11-02 22:24:51,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:51,707 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:51,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:51,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:51,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:51,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 22:24:51,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:51,973 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-02 22:24:51,973 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:51,973 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595685826] [2021-11-02 22:24:51,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595685826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:51,974 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:51,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:24:51,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779591900] [2021-11-02 22:24:51,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:24:51,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:51,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:24:51,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:24:51,976 INFO L87 Difference]: Start difference. First operand 126 states and 138 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 9 states have internal predecessors, (37), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:24:52,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:52,481 INFO L93 Difference]: Finished difference Result 174 states and 191 transitions. [2021-11-02 22:24:52,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:24:52,482 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 9 states have internal predecessors, (37), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 47 [2021-11-02 22:24:52,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:52,483 INFO L225 Difference]: With dead ends: 174 [2021-11-02 22:24:52,483 INFO L226 Difference]: Without dead ends: 119 [2021-11-02 22:24:52,483 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:24:52,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-02 22:24:52,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-02 22:24:52,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 94 states have (on average 1.2340425531914894) internal successors, (116), 106 states have internal predecessors, (116), 9 states have call successors, (9), 9 states have call predecessors, (9), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:24:52,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 130 transitions. [2021-11-02 22:24:52,489 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 130 transitions. Word has length 47 [2021-11-02 22:24:52,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:52,490 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 130 transitions. [2021-11-02 22:24:52,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 9 states have internal predecessors, (37), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:24:52,490 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 130 transitions. [2021-11-02 22:24:52,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-02 22:24:52,491 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:52,492 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:52,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-02 22:24:52,492 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:52,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:52,493 INFO L85 PathProgramCache]: Analyzing trace with hash -59486911, now seen corresponding path program 1 times [2021-11-02 22:24:52,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:52,493 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160278982] [2021-11-02 22:24:52,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:52,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:52,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:52,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:52,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:52,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-11-02 22:24:52,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:52,779 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:52,779 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:52,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160278982] [2021-11-02 22:24:52,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160278982] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:52,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127024409] [2021-11-02 22:24:52,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:52,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:52,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:52,782 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:52,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:24:53,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:53,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-02 22:24:53,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:53,451 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 [2021-11-02 22:24:53,516 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:24:53,517 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 31 treesize of output 30 [2021-11-02 22:24:53,721 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 [2021-11-02 22:24:53,738 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:53,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127024409] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:53,739 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:53,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 18 [2021-11-02 22:24:53,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849695379] [2021-11-02 22:24:53,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:24:53,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:53,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:24:53,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:24:53,741 INFO L87 Difference]: Start difference. First operand 119 states and 130 transitions. Second operand has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 16 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:24:54,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:54,637 INFO L93 Difference]: Finished difference Result 174 states and 191 transitions. [2021-11-02 22:24:54,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:24:54,639 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 16 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2021-11-02 22:24:54,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:54,640 INFO L225 Difference]: With dead ends: 174 [2021-11-02 22:24:54,640 INFO L226 Difference]: Without dead ends: 126 [2021-11-02 22:24:54,641 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:24:54,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-02 22:24:54,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2021-11-02 22:24:54,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 98 states have (on average 1.2244897959183674) internal successors, (120), 110 states have internal predecessors, (120), 9 states have call successors, (9), 9 states have call predecessors, (9), 5 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:24:54,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 134 transitions. [2021-11-02 22:24:54,648 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 134 transitions. Word has length 47 [2021-11-02 22:24:54,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:54,648 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 134 transitions. [2021-11-02 22:24:54,648 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.1666666666666665) internal successors, (57), 16 states have internal predecessors, (57), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:24:54,649 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 134 transitions. [2021-11-02 22:24:54,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-02 22:24:54,650 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:54,650 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:54,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:54,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-02 22:24:54,866 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:54,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:54,866 INFO L85 PathProgramCache]: Analyzing trace with hash 1649507588, now seen corresponding path program 2 times [2021-11-02 22:24:54,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:54,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914730098] [2021-11-02 22:24:54,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:54,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:54,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:55,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:55,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:55,045 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-11-02 22:24:55,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:55,050 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:55,050 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:55,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914730098] [2021-11-02 22:24:55,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914730098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:55,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402845930] [2021-11-02 22:24:55,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:24:55,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:55,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:55,052 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:55,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:24:55,428 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:24:55,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:24:55,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:24:55,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:55,758 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:55,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402845930] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:55,758 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:24:55,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2021-11-02 22:24:55,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492544507] [2021-11-02 22:24:55,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:24:55,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:55,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:24:55,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:24:55,760 INFO L87 Difference]: Start difference. First operand 123 states and 134 transitions. Second operand has 18 states, 17 states have (on average 4.0) internal successors, (68), 15 states have internal predecessors, (68), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:24:56,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:56,370 INFO L93 Difference]: Finished difference Result 135 states and 148 transitions. [2021-11-02 22:24:56,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:24:56,370 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.0) internal successors, (68), 15 states have internal predecessors, (68), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 51 [2021-11-02 22:24:56,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:56,371 INFO L225 Difference]: With dead ends: 135 [2021-11-02 22:24:56,372 INFO L226 Difference]: Without dead ends: 135 [2021-11-02 22:24:56,372 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:24:56,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-02 22:24:56,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 132. [2021-11-02 22:24:56,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 106 states have (on average 1.2169811320754718) internal successors, (129), 118 states have internal predecessors, (129), 10 states have call successors, (10), 9 states have call predecessors, (10), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:24:56,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 145 transitions. [2021-11-02 22:24:56,378 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 145 transitions. Word has length 51 [2021-11-02 22:24:56,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:56,379 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 145 transitions. [2021-11-02 22:24:56,379 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.0) internal successors, (68), 15 states have internal predecessors, (68), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:24:56,379 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 145 transitions. [2021-11-02 22:24:56,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 22:24:56,380 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:56,380 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:56,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:56,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-02 22:24:56,594 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting cstrncmpErr0REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:56,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:56,594 INFO L85 PathProgramCache]: Analyzing trace with hash 337192400, now seen corresponding path program 1 times [2021-11-02 22:24:56,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:56,594 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352979013] [2021-11-02 22:24:56,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:56,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:56,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:56,677 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:56,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:56,682 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-11-02 22:24:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:56,689 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-02 22:24:56,689 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:56,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352979013] [2021-11-02 22:24:56,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352979013] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:56,690 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:24:56,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-02 22:24:56,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074347624] [2021-11-02 22:24:56,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:24:56,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:56,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:24:56,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:24:56,692 INFO L87 Difference]: Start difference. First operand 132 states and 145 transitions. Second operand has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:24:56,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:56,919 INFO L93 Difference]: Finished difference Result 130 states and 143 transitions. [2021-11-02 22:24:56,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:24:56,919 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 53 [2021-11-02 22:24:56,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:56,921 INFO L225 Difference]: With dead ends: 130 [2021-11-02 22:24:56,921 INFO L226 Difference]: Without dead ends: 130 [2021-11-02 22:24:56,921 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:24:56,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-02 22:24:56,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2021-11-02 22:24:56,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 106 states have (on average 1.1981132075471699) internal successors, (127), 116 states have internal predecessors, (127), 10 states have call successors, (10), 9 states have call predecessors, (10), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:24:56,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 143 transitions. [2021-11-02 22:24:56,927 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 143 transitions. Word has length 53 [2021-11-02 22:24:56,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:56,928 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 143 transitions. [2021-11-02 22:24:56,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.714285714285714) internal successors, (40), 5 states have internal predecessors, (40), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:24:56,928 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 143 transitions. [2021-11-02 22:24:56,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 22:24:56,929 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:56,930 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:56,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-02 22:24:56,930 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:56,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:56,931 INFO L85 PathProgramCache]: Analyzing trace with hash 337192401, now seen corresponding path program 1 times [2021-11-02 22:24:56,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:56,931 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095535543] [2021-11-02 22:24:56,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:56,931 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:56,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:57,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:57,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:57,166 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-11-02 22:24:57,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:57,171 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:57,171 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:57,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095535543] [2021-11-02 22:24:57,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095535543] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:57,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423673992] [2021-11-02 22:24:57,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:57,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:57,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:57,174 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:57,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:24:57,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:57,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 22:24:57,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:57,913 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:24:57,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423673992] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:24:57,913 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:24:57,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [11] total 18 [2021-11-02 22:24:57,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631146650] [2021-11-02 22:24:57,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:24:57,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:24:57,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:24:57,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:24:57,915 INFO L87 Difference]: Start difference. First operand 130 states and 143 transitions. Second operand has 8 states, 8 states have (on average 4.75) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:24:57,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:24:57,975 INFO L93 Difference]: Finished difference Result 168 states and 186 transitions. [2021-11-02 22:24:57,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:24:57,976 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 53 [2021-11-02 22:24:57,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:24:57,978 INFO L225 Difference]: With dead ends: 168 [2021-11-02 22:24:57,978 INFO L226 Difference]: Without dead ends: 168 [2021-11-02 22:24:57,978 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=338, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:24:57,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-02 22:24:57,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2021-11-02 22:24:57,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 135 states have (on average 1.1851851851851851) internal successors, (160), 146 states have internal predecessors, (160), 12 states have call successors, (12), 10 states have call predecessors, (12), 8 states have return successors, (10), 7 states have call predecessors, (10), 8 states have call successors, (10) [2021-11-02 22:24:57,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 182 transitions. [2021-11-02 22:24:57,987 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 182 transitions. Word has length 53 [2021-11-02 22:24:57,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:24:57,987 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 182 transitions. [2021-11-02 22:24:57,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.75) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:24:57,988 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 182 transitions. [2021-11-02 22:24:57,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 22:24:57,989 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:24:57,989 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:24:58,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:24:58,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-02 22:24:58,206 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:24:58,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:24:58,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1157962655, now seen corresponding path program 3 times [2021-11-02 22:24:58,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:24:58,206 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784269508] [2021-11-02 22:24:58,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:24:58,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:24:58,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:58,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:24:58,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:58,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-11-02 22:24:58,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:24:58,671 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:24:58,671 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:24:58,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784269508] [2021-11-02 22:24:58,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784269508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:24:58,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889820333] [2021-11-02 22:24:58,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:24:58,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:24:58,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:24:58,673 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:24:58,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:24:59,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:24:59,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:24:59,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-02 22:24:59,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:24:59,243 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:24:59,244 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 [2021-11-02 22:24:59,256 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 [2021-11-02 22:24:59,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:24:59,886 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-02 22:24:59,887 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 [2021-11-02 22:25:10,662 INFO L354 Elim1Store]: treesize reduction 105, result has 2.8 percent of original size [2021-11-02 22:25:10,663 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 66 treesize of output 40 [2021-11-02 22:25:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:25:10,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889820333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:10,687 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:10,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 29 [2021-11-02 22:25:10,688 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759755597] [2021-11-02 22:25:10,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-02 22:25:10,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:10,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-02 22:25:10,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=735, Unknown=2, NotChecked=0, Total=812 [2021-11-02 22:25:10,690 INFO L87 Difference]: Start difference. First operand 164 states and 182 transitions. Second operand has 29 states, 28 states have (on average 2.9642857142857144) internal successors, (83), 26 states have internal predecessors, (83), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:45,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:45,448 INFO L93 Difference]: Finished difference Result 302 states and 331 transitions. [2021-11-02 22:25:45,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:25:45,448 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.9642857142857144) internal successors, (83), 26 states have internal predecessors, (83), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 56 [2021-11-02 22:25:45,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:45,450 INFO L225 Difference]: With dead ends: 302 [2021-11-02 22:25:45,451 INFO L226 Difference]: Without dead ends: 252 [2021-11-02 22:25:45,452 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 39.1s TimeCoverageRelationStatistics Valid=225, Invalid=1663, Unknown=4, NotChecked=0, Total=1892 [2021-11-02 22:25:45,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2021-11-02 22:25:45,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 241. [2021-11-02 22:25:45,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 205 states have (on average 1.1804878048780487) internal successors, (242), 217 states have internal predecessors, (242), 17 states have call successors, (17), 15 states have call predecessors, (17), 10 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-02 22:25:45,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 271 transitions. [2021-11-02 22:25:45,461 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 271 transitions. Word has length 56 [2021-11-02 22:25:45,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:45,462 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 271 transitions. [2021-11-02 22:25:45,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.9642857142857144) internal successors, (83), 26 states have internal predecessors, (83), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:45,462 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 271 transitions. [2021-11-02 22:25:45,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:25:45,463 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:45,464 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:45,505 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-02 22:25:45,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-02 22:25:45,686 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:25:45,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:45,686 INFO L85 PathProgramCache]: Analyzing trace with hash -713458357, now seen corresponding path program 1 times [2021-11-02 22:25:45,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:45,687 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742190669] [2021-11-02 22:25:45,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:45,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:45,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:45,873 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:45,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:45,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:25:45,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:45,885 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:25:45,885 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:45,885 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742190669] [2021-11-02 22:25:45,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742190669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:45,885 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611306649] [2021-11-02 22:25:45,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:45,885 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:45,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:45,886 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:45,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:25:46,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:46,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-02 22:25:46,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:46,573 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:25:46,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611306649] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:46,573 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:46,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 17 [2021-11-02 22:25:46,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490061034] [2021-11-02 22:25:46,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:25:46,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:46,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:25:46,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:25:46,574 INFO L87 Difference]: Start difference. First operand 241 states and 271 transitions. Second operand has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 14 states have internal predecessors, (71), 6 states have call successors, (8), 5 states have call predecessors, (8), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:47,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:47,200 INFO L93 Difference]: Finished difference Result 291 states and 328 transitions. [2021-11-02 22:25:47,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:25:47,200 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 14 states have internal predecessors, (71), 6 states have call successors, (8), 5 states have call predecessors, (8), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 60 [2021-11-02 22:25:47,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:47,202 INFO L225 Difference]: With dead ends: 291 [2021-11-02 22:25:47,202 INFO L226 Difference]: Without dead ends: 291 [2021-11-02 22:25:47,203 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:25:47,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-02 22:25:47,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 272. [2021-11-02 22:25:47,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 234 states have (on average 1.235042735042735) internal successors, (289), 246 states have internal predecessors, (289), 17 states have call successors, (17), 17 states have call predecessors, (17), 12 states have return successors, (12), 8 states have call predecessors, (12), 10 states have call successors, (12) [2021-11-02 22:25:47,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 318 transitions. [2021-11-02 22:25:47,213 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 318 transitions. Word has length 60 [2021-11-02 22:25:47,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:47,213 INFO L470 AbstractCegarLoop]: Abstraction has 272 states and 318 transitions. [2021-11-02 22:25:47,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 14 states have internal predecessors, (71), 6 states have call successors, (8), 5 states have call predecessors, (8), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:47,214 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 318 transitions. [2021-11-02 22:25:47,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:25:47,215 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:47,215 INFO L513 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1] [2021-11-02 22:25:47,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:25:47,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-02 22:25:47,430 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:25:47,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:47,430 INFO L85 PathProgramCache]: Analyzing trace with hash 762560510, now seen corresponding path program 4 times [2021-11-02 22:25:47,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:47,430 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446198399] [2021-11-02 22:25:47,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:47,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:47,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:47,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:47,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:47,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:25:47,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:47,641 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:25:47,641 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:47,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446198399] [2021-11-02 22:25:47,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446198399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:47,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28029849] [2021-11-02 22:25:47,642 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:25:47,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:47,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:47,643 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:47,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:25:48,120 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:25:48,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:25:48,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-02 22:25:48,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:48,469 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:25:48,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28029849] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:48,469 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:48,470 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2021-11-02 22:25:48,470 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13044485] [2021-11-02 22:25:48,470 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:25:48,470 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:48,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:25:48,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:25:48,471 INFO L87 Difference]: Start difference. First operand 272 states and 318 transitions. Second operand has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 17 states have internal predecessors, (81), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:49,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:49,192 INFO L93 Difference]: Finished difference Result 295 states and 345 transitions. [2021-11-02 22:25:49,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:25:49,193 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 17 states have internal predecessors, (81), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 60 [2021-11-02 22:25:49,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:49,196 INFO L225 Difference]: With dead ends: 295 [2021-11-02 22:25:49,196 INFO L226 Difference]: Without dead ends: 295 [2021-11-02 22:25:49,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=598, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:25:49,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-11-02 22:25:49,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 290. [2021-11-02 22:25:49,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 290 states, 250 states have (on average 1.228) internal successors, (307), 262 states have internal predecessors, (307), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:25:49,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 340 transitions. [2021-11-02 22:25:49,209 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 340 transitions. Word has length 60 [2021-11-02 22:25:49,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:49,209 INFO L470 AbstractCegarLoop]: Abstraction has 290 states and 340 transitions. [2021-11-02 22:25:49,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 4.2631578947368425) internal successors, (81), 17 states have internal predecessors, (81), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:25:49,210 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 340 transitions. [2021-11-02 22:25:49,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:25:49,211 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:49,211 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:49,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-02 22:25:49,430 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:49,430 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting cstrncmpErr2REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:25:49,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:49,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1561289195, now seen corresponding path program 1 times [2021-11-02 22:25:49,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:49,431 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367153138] [2021-11-02 22:25:49,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:49,431 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:49,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:49,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:49,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:49,515 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:25:49,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:49,522 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-02 22:25:49,522 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:49,522 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367153138] [2021-11-02 22:25:49,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367153138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:25:49,523 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:25:49,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:25:49,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740176694] [2021-11-02 22:25:49,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:25:49,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:49,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:25:49,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:25:49,524 INFO L87 Difference]: Start difference. First operand 290 states and 340 transitions. Second operand has 9 states, 8 states have (on average 5.5) internal successors, (44), 6 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:49,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:25:49,820 INFO L93 Difference]: Finished difference Result 289 states and 335 transitions. [2021-11-02 22:25:49,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:25:49,821 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.5) internal successors, (44), 6 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 62 [2021-11-02 22:25:49,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:25:49,823 INFO L225 Difference]: With dead ends: 289 [2021-11-02 22:25:49,823 INFO L226 Difference]: Without dead ends: 289 [2021-11-02 22:25:49,824 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:25:49,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-02 22:25:49,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-02 22:25:49,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 250 states have (on average 1.208) internal successors, (302), 261 states have internal predecessors, (302), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:25:49,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 335 transitions. [2021-11-02 22:25:49,838 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 335 transitions. Word has length 62 [2021-11-02 22:25:49,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:25:49,838 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 335 transitions. [2021-11-02 22:25:49,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.5) internal successors, (44), 6 states have internal predecessors, (44), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:25:49,838 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 335 transitions. [2021-11-02 22:25:49,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:25:49,839 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:25:49,840 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:25:49,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-11-02 22:25:49,840 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting cstrncmpErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:25:49,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:25:49,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1561289196, now seen corresponding path program 1 times [2021-11-02 22:25:49,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:25:49,841 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665875075] [2021-11-02 22:25:49,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:49,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:25:49,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:50,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:25:50,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:50,090 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:25:50,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:50,096 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:25:50,096 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:25:50,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665875075] [2021-11-02 22:25:50,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665875075] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:50,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878374820] [2021-11-02 22:25:50,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:25:50,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:25:50,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:25:50,106 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:25:50,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:25:50,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:25:50,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-02 22:25:50,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:25:51,139 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:25:51,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878374820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:25:51,139 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:25:51,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 21 [2021-11-02 22:25:51,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049714333] [2021-11-02 22:25:51,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:25:51,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:25:51,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:25:51,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-02 22:25:51,141 INFO L87 Difference]: Start difference. First operand 289 states and 335 transitions. Second operand has 22 states, 20 states have (on average 4.1) internal successors, (82), 18 states have internal predecessors, (82), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:26:05,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:05,875 INFO L93 Difference]: Finished difference Result 338 states and 388 transitions. [2021-11-02 22:26:05,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:26:05,882 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 4.1) internal successors, (82), 18 states have internal predecessors, (82), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 62 [2021-11-02 22:26:05,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:05,885 INFO L225 Difference]: With dead ends: 338 [2021-11-02 22:26:05,885 INFO L226 Difference]: Without dead ends: 338 [2021-11-02 22:26:05,886 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=134, Invalid=736, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:26:05,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2021-11-02 22:26:05,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 292. [2021-11-02 22:26:05,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 253 states have (on average 1.2015810276679841) internal successors, (304), 264 states have internal predecessors, (304), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:26:05,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 337 transitions. [2021-11-02 22:26:05,898 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 337 transitions. Word has length 62 [2021-11-02 22:26:05,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:05,899 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 337 transitions. [2021-11-02 22:26:05,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 4.1) internal successors, (82), 18 states have internal predecessors, (82), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:26:05,899 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 337 transitions. [2021-11-02 22:26:05,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-02 22:26:05,901 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:05,901 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:05,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:06,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:06,121 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting cstrncmpErr8REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:06,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:06,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1455334444, now seen corresponding path program 1 times [2021-11-02 22:26:06,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:06,122 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82761221] [2021-11-02 22:26:06,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:06,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:06,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:06,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:26:06,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,203 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-02 22:26:06,203 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:06,203 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82761221] [2021-11-02 22:26:06,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82761221] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:26:06,204 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:26:06,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:26:06,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104362728] [2021-11-02 22:26:06,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:26:06,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:06,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:26:06,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:26:06,205 INFO L87 Difference]: Start difference. First operand 292 states and 337 transitions. Second operand has 9 states, 8 states have (on average 5.75) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:26:06,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:06,495 INFO L93 Difference]: Finished difference Result 291 states and 334 transitions. [2021-11-02 22:26:06,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:26:06,496 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.75) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2021-11-02 22:26:06,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:06,498 INFO L225 Difference]: With dead ends: 291 [2021-11-02 22:26:06,498 INFO L226 Difference]: Without dead ends: 291 [2021-11-02 22:26:06,498 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:26:06,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-02 22:26:06,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 291. [2021-11-02 22:26:06,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 253 states have (on average 1.1897233201581028) internal successors, (301), 263 states have internal predecessors, (301), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:26:06,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 334 transitions. [2021-11-02 22:26:06,509 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 334 transitions. Word has length 64 [2021-11-02 22:26:06,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:06,510 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 334 transitions. [2021-11-02 22:26:06,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.75) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:26:06,510 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 334 transitions. [2021-11-02 22:26:06,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-02 22:26:06,511 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:06,512 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:06,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-02 22:26:06,512 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting cstrncmpErr9REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:06,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:06,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1455334445, now seen corresponding path program 1 times [2021-11-02 22:26:06,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:06,513 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76830733] [2021-11-02 22:26:06,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:06,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:06,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,723 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:06,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,727 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:26:06,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:06,732 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:26:06,733 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:06,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76830733] [2021-11-02 22:26:06,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76830733] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:06,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240492840] [2021-11-02 22:26:06,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:06,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:06,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:06,735 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:06,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:26:07,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:07,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-02 22:26:07,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:07,453 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:26:07,453 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 [2021-11-02 22:26:08,582 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:26:08,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240492840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:08,582 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:08,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 27 [2021-11-02 22:26:08,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615180378] [2021-11-02 22:26:08,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 22:26:08,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:08,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 22:26:08,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=683, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:26:08,584 INFO L87 Difference]: Start difference. First operand 291 states and 334 transitions. Second operand has 28 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 23 states have internal predecessors, (100), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:26:24,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:24,771 INFO L93 Difference]: Finished difference Result 350 states and 393 transitions. [2021-11-02 22:26:24,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:26:24,772 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 23 states have internal predecessors, (100), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 64 [2021-11-02 22:26:24,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:24,774 INFO L225 Difference]: With dead ends: 350 [2021-11-02 22:26:24,774 INFO L226 Difference]: Without dead ends: 350 [2021-11-02 22:26:24,775 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=272, Invalid=2178, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:26:24,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-11-02 22:26:24,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 293. [2021-11-02 22:26:24,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 255 states have (on average 1.188235294117647) internal successors, (303), 265 states have internal predecessors, (303), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:26:24,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 336 transitions. [2021-11-02 22:26:24,786 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 336 transitions. Word has length 64 [2021-11-02 22:26:24,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:24,787 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 336 transitions. [2021-11-02 22:26:24,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.7037037037037037) internal successors, (100), 23 states have internal predecessors, (100), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:26:24,787 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 336 transitions. [2021-11-02 22:26:24,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:26:24,788 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:24,789 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:24,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:25,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:25,011 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting cstrncmpErr6REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:25,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:25,011 INFO L85 PathProgramCache]: Analyzing trace with hash -1583210387, now seen corresponding path program 1 times [2021-11-02 22:26:25,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:25,011 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610134120] [2021-11-02 22:26:25,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:25,011 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:25,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:25,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:25,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:25,095 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:26:25,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:25,101 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-02 22:26:25,102 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:25,102 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610134120] [2021-11-02 22:26:25,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610134120] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:26:25,102 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:26:25,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:26:25,103 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182306461] [2021-11-02 22:26:25,103 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:26:25,103 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:25,104 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:26:25,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:26:25,104 INFO L87 Difference]: Start difference. First operand 293 states and 336 transitions. Second operand has 9 states, 8 states have (on average 6.0) internal successors, (48), 6 states have internal predecessors, (48), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:26:25,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:25,398 INFO L93 Difference]: Finished difference Result 292 states and 333 transitions. [2021-11-02 22:26:25,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:26:25,398 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.0) internal successors, (48), 6 states have internal predecessors, (48), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 66 [2021-11-02 22:26:25,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:25,400 INFO L225 Difference]: With dead ends: 292 [2021-11-02 22:26:25,400 INFO L226 Difference]: Without dead ends: 292 [2021-11-02 22:26:25,400 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:26:25,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-11-02 22:26:25,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 292. [2021-11-02 22:26:25,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 255 states have (on average 1.1764705882352942) internal successors, (300), 264 states have internal predecessors, (300), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:26:25,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 333 transitions. [2021-11-02 22:26:25,409 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 333 transitions. Word has length 66 [2021-11-02 22:26:25,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:25,410 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 333 transitions. [2021-11-02 22:26:25,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.0) internal successors, (48), 6 states have internal predecessors, (48), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:26:25,410 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 333 transitions. [2021-11-02 22:26:25,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:26:25,411 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:25,411 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:25,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-02 22:26:25,412 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting cstrncmpErr7REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:25,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:25,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1583210386, now seen corresponding path program 1 times [2021-11-02 22:26:25,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:25,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870169062] [2021-11-02 22:26:25,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:25,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:25,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:25,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:25,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:25,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:26:25,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:25,709 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:26:25,710 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:25,710 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870169062] [2021-11-02 22:26:25,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870169062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:25,710 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788934426] [2021-11-02 22:26:25,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:25,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:25,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:25,712 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:25,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:26:26,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:26,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-02 22:26:26,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:26,827 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-02 22:26:26,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788934426] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:26,828 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:26,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 22 [2021-11-02 22:26:26,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568482746] [2021-11-02 22:26:26,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:26:26,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:26,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:26:26,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:26:26,830 INFO L87 Difference]: Start difference. First operand 292 states and 333 transitions. Second operand has 23 states, 21 states have (on average 4.095238095238095) internal successors, (86), 19 states have internal predecessors, (86), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:26:41,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:41,811 INFO L93 Difference]: Finished difference Result 372 states and 424 transitions. [2021-11-02 22:26:41,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:26:41,811 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 4.095238095238095) internal successors, (86), 19 states have internal predecessors, (86), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 66 [2021-11-02 22:26:41,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:41,814 INFO L225 Difference]: With dead ends: 372 [2021-11-02 22:26:41,814 INFO L226 Difference]: Without dead ends: 369 [2021-11-02 22:26:41,815 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:26:41,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-11-02 22:26:41,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 297. [2021-11-02 22:26:41,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 260 states have (on average 1.176923076923077) internal successors, (306), 269 states have internal predecessors, (306), 19 states have call successors, (19), 17 states have call predecessors, (19), 12 states have return successors, (14), 10 states have call predecessors, (14), 12 states have call successors, (14) [2021-11-02 22:26:41,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 339 transitions. [2021-11-02 22:26:41,827 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 339 transitions. Word has length 66 [2021-11-02 22:26:41,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:41,827 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 339 transitions. [2021-11-02 22:26:41,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 4.095238095238095) internal successors, (86), 19 states have internal predecessors, (86), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:26:41,828 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 339 transitions. [2021-11-02 22:26:41,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-02 22:26:41,829 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:41,829 INFO L513 BasicCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:41,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2021-11-02 22:26:42,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:42,046 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:42,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:42,046 INFO L85 PathProgramCache]: Analyzing trace with hash -544379481, now seen corresponding path program 5 times [2021-11-02 22:26:42,046 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:42,046 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646270076] [2021-11-02 22:26:42,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:42,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:42,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:42,901 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:42,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:42,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:26:42,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:42,919 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:26:42,919 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:42,919 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646270076] [2021-11-02 22:26:42,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646270076] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:42,920 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1931675839] [2021-11-02 22:26:42,920 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:26:42,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:42,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:42,930 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:42,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:26:43,503 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:26:43,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:26:43,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 71 conjunts are in the unsatisfiable core [2021-11-02 22:26:43,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:43,969 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 [2021-11-02 22:26:44,063 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:26:44,064 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 31 treesize of output 30 [2021-11-02 22:26:45,665 INFO L354 Elim1Store]: treesize reduction 81, result has 16.5 percent of original size [2021-11-02 22:26:45,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 44 treesize of output 35 [2021-11-02 22:26:45,683 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 8 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:26:45,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1931675839] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:45,683 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:45,683 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 43 [2021-11-02 22:26:45,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788937931] [2021-11-02 22:26:45,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-02 22:26:45,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:45,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-02 22:26:45,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1682, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:26:45,686 INFO L87 Difference]: Start difference. First operand 297 states and 339 transitions. Second operand has 43 states, 41 states have (on average 2.5609756097560976) internal successors, (105), 40 states have internal predecessors, (105), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:26:50,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:50,445 INFO L93 Difference]: Finished difference Result 512 states and 582 transitions. [2021-11-02 22:26:50,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-02 22:26:50,446 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 41 states have (on average 2.5609756097560976) internal successors, (105), 40 states have internal predecessors, (105), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 65 [2021-11-02 22:26:50,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:50,448 INFO L225 Difference]: With dead ends: 512 [2021-11-02 22:26:50,448 INFO L226 Difference]: Without dead ends: 427 [2021-11-02 22:26:50,451 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=513, Invalid=5493, Unknown=0, NotChecked=0, Total=6006 [2021-11-02 22:26:50,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2021-11-02 22:26:50,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 402. [2021-11-02 22:26:50,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 356 states have (on average 1.1769662921348314) internal successors, (419), 366 states have internal predecessors, (419), 25 states have call successors, (25), 23 states have call predecessors, (25), 15 states have return successors, (17), 12 states have call predecessors, (17), 15 states have call successors, (17) [2021-11-02 22:26:50,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 461 transitions. [2021-11-02 22:26:50,463 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 461 transitions. Word has length 65 [2021-11-02 22:26:50,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:50,464 INFO L470 AbstractCegarLoop]: Abstraction has 402 states and 461 transitions. [2021-11-02 22:26:50,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 41 states have (on average 2.5609756097560976) internal successors, (105), 40 states have internal predecessors, (105), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:26:50,464 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 461 transitions. [2021-11-02 22:26:50,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:26:50,466 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:50,466 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:50,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:50,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:26:50,682 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:50,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:50,682 INFO L85 PathProgramCache]: Analyzing trace with hash -780379538, now seen corresponding path program 1 times [2021-11-02 22:26:50,682 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:50,682 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640783812] [2021-11-02 22:26:50,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:50,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:50,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:50,808 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:50,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:50,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-11-02 22:26:50,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:50,862 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-02 22:26:50,863 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:50,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640783812] [2021-11-02 22:26:50,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640783812] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:50,863 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162946921] [2021-11-02 22:26:50,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:50,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:50,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:50,865 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:50,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:26:51,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:51,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-02 22:26:51,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:51,860 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-02 22:26:51,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162946921] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:51,860 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:51,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 11 [2021-11-02 22:26:51,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373202843] [2021-11-02 22:26:51,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:26:51,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:51,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:26:51,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:26:51,862 INFO L87 Difference]: Start difference. First operand 402 states and 461 transitions. Second operand has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 8 states have internal predecessors, (50), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:26:52,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:26:52,364 INFO L93 Difference]: Finished difference Result 561 states and 637 transitions. [2021-11-02 22:26:52,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:26:52,364 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 8 states have internal predecessors, (50), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 68 [2021-11-02 22:26:52,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:26:52,367 INFO L225 Difference]: With dead ends: 561 [2021-11-02 22:26:52,367 INFO L226 Difference]: Without dead ends: 523 [2021-11-02 22:26:52,367 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:26:52,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-11-02 22:26:52,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 506. [2021-11-02 22:26:52,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 453 states have (on average 1.1766004415011038) internal successors, (533), 462 states have internal predecessors, (533), 28 states have call successors, (28), 25 states have call predecessors, (28), 19 states have return successors, (22), 18 states have call predecessors, (22), 18 states have call successors, (22) [2021-11-02 22:26:52,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 583 transitions. [2021-11-02 22:26:52,384 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 583 transitions. Word has length 68 [2021-11-02 22:26:52,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:26:52,384 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 583 transitions. [2021-11-02 22:26:52,384 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.545454545454546) internal successors, (50), 8 states have internal predecessors, (50), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:26:52,385 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 583 transitions. [2021-11-02 22:26:52,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-02 22:26:52,386 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:26:52,386 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:26:52,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:26:52,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-02 22:26:52,614 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:26:52,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:26:52,614 INFO L85 PathProgramCache]: Analyzing trace with hash -1043639369, now seen corresponding path program 1 times [2021-11-02 22:26:52,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:26:52,614 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744649501] [2021-11-02 22:26:52,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:52,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:26:52,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:52,890 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:26:52,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:52,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-11-02 22:26:52,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:52,905 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:26:52,906 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:26:52,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744649501] [2021-11-02 22:26:52,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744649501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:52,906 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151712734] [2021-11-02 22:26:52,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:26:52,907 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:26:52,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:26:52,908 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:26:52,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:26:53,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:26:53,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-02 22:26:53,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:26:53,638 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:26:53,638 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 [2021-11-02 22:26:54,861 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:26:54,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151712734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:26:54,862 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:26:54,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17] total 29 [2021-11-02 22:26:54,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546986505] [2021-11-02 22:26:54,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-02 22:26:54,863 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:26:54,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-02 22:26:54,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=779, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:26:54,864 INFO L87 Difference]: Start difference. First operand 506 states and 583 transitions. Second operand has 30 states, 29 states have (on average 3.793103448275862) internal successors, (110), 25 states have internal predecessors, (110), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:27:10,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:10,434 INFO L93 Difference]: Finished difference Result 577 states and 656 transitions. [2021-11-02 22:27:10,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:27:10,434 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 3.793103448275862) internal successors, (110), 25 states have internal predecessors, (110), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-11-02 22:27:10,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:10,436 INFO L225 Difference]: With dead ends: 577 [2021-11-02 22:27:10,436 INFO L226 Difference]: Without dead ends: 576 [2021-11-02 22:27:10,437 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=257, Invalid=1813, Unknown=0, NotChecked=0, Total=2070 [2021-11-02 22:27:10,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-11-02 22:27:10,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 550. [2021-11-02 22:27:10,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 550 states, 494 states have (on average 1.180161943319838) internal successors, (583), 503 states have internal predecessors, (583), 28 states have call successors, (28), 28 states have call predecessors, (28), 22 states have return successors, (22), 18 states have call predecessors, (22), 18 states have call successors, (22) [2021-11-02 22:27:10,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 550 states to 550 states and 633 transitions. [2021-11-02 22:27:10,453 INFO L78 Accepts]: Start accepts. Automaton has 550 states and 633 transitions. Word has length 69 [2021-11-02 22:27:10,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:10,453 INFO L470 AbstractCegarLoop]: Abstraction has 550 states and 633 transitions. [2021-11-02 22:27:10,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 3.793103448275862) internal successors, (110), 25 states have internal predecessors, (110), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:27:10,453 INFO L276 IsEmpty]: Start isEmpty. Operand 550 states and 633 transitions. [2021-11-02 22:27:10,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-02 22:27:10,455 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:10,455 INFO L513 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:10,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:10,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:27:10,679 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:27:10,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:10,679 INFO L85 PathProgramCache]: Analyzing trace with hash 1491423914, now seen corresponding path program 6 times [2021-11-02 22:27:10,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:10,680 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730027852] [2021-11-02 22:27:10,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:10,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:10,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:10,896 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:10,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:10,903 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-11-02 22:27:10,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:10,908 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:27:10,908 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:10,908 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730027852] [2021-11-02 22:27:10,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730027852] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:10,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267276828] [2021-11-02 22:27:10,909 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:27:10,909 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:10,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:10,918 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:10,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:27:11,683 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:27:11,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:11,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:27:11,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:12,260 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 18 proven. 31 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:27:12,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267276828] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:12,261 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:12,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 22 [2021-11-02 22:27:12,261 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657710298] [2021-11-02 22:27:12,263 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-02 22:27:12,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:12,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-02 22:27:12,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:27:12,264 INFO L87 Difference]: Start difference. First operand 550 states and 633 transitions. Second operand has 23 states, 22 states have (on average 4.5) internal successors, (99), 20 states have internal predecessors, (99), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:27:27,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:27,301 INFO L93 Difference]: Finished difference Result 589 states and 673 transitions. [2021-11-02 22:27:27,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:27:27,302 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 4.5) internal successors, (99), 20 states have internal predecessors, (99), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 69 [2021-11-02 22:27:27,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:27,304 INFO L225 Difference]: With dead ends: 589 [2021-11-02 22:27:27,304 INFO L226 Difference]: Without dead ends: 589 [2021-11-02 22:27:27,305 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=157, Invalid=835, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:27:27,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-11-02 22:27:27,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 577. [2021-11-02 22:27:27,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 577 states, 518 states have (on average 1.1776061776061777) internal successors, (610), 527 states have internal predecessors, (610), 31 states have call successors, (31), 28 states have call predecessors, (31), 22 states have return successors, (25), 21 states have call predecessors, (25), 21 states have call successors, (25) [2021-11-02 22:27:27,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 577 states to 577 states and 666 transitions. [2021-11-02 22:27:27,320 INFO L78 Accepts]: Start accepts. Automaton has 577 states and 666 transitions. Word has length 69 [2021-11-02 22:27:27,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:27,328 INFO L470 AbstractCegarLoop]: Abstraction has 577 states and 666 transitions. [2021-11-02 22:27:27,328 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 4.5) internal successors, (99), 20 states have internal predecessors, (99), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:27:27,328 INFO L276 IsEmpty]: Start isEmpty. Operand 577 states and 666 transitions. [2021-11-02 22:27:27,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-02 22:27:27,330 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:27,330 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:27,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:27,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-02 22:27:27,542 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting cstrncmpErr9REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:27:27,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:27,542 INFO L85 PathProgramCache]: Analyzing trace with hash -2144901991, now seen corresponding path program 1 times [2021-11-02 22:27:27,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:27,542 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683335904] [2021-11-02 22:27:27,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:27,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:27,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:27,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:27,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:27,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-11-02 22:27:27,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:27,830 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:27:27,830 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:27,830 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683335904] [2021-11-02 22:27:27,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683335904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:27,830 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299840341] [2021-11-02 22:27:27,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:27,831 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:27,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:27,832 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:27,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-02 22:27:28,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:28,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-02 22:27:28,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:28,662 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:27:28,663 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 [2021-11-02 22:27:28,666 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 [2021-11-02 22:27:29,551 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:27:29,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299840341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:29,552 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:29,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 27 [2021-11-02 22:27:29,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828223926] [2021-11-02 22:27:29,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-02 22:27:29,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:29,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-02 22:27:29,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2021-11-02 22:27:29,553 INFO L87 Difference]: Start difference. First operand 577 states and 666 transitions. Second operand has 28 states, 27 states have (on average 4.074074074074074) internal successors, (110), 23 states have internal predecessors, (110), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:27:45,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:27:45,005 INFO L93 Difference]: Finished difference Result 607 states and 690 transitions. [2021-11-02 22:27:45,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-02 22:27:45,005 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.074074074074074) internal successors, (110), 23 states have internal predecessors, (110), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 73 [2021-11-02 22:27:45,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:27:45,008 INFO L225 Difference]: With dead ends: 607 [2021-11-02 22:27:45,009 INFO L226 Difference]: Without dead ends: 546 [2021-11-02 22:27:45,009 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=194, Invalid=1446, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:27:45,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-11-02 22:27:45,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 504. [2021-11-02 22:27:45,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 453 states have (on average 1.1898454746136866) internal successors, (539), 461 states have internal predecessors, (539), 26 states have call successors, (26), 23 states have call predecessors, (26), 19 states have return successors, (22), 19 states have call predecessors, (22), 19 states have call successors, (22) [2021-11-02 22:27:45,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 587 transitions. [2021-11-02 22:27:45,023 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 587 transitions. Word has length 73 [2021-11-02 22:27:45,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:27:45,023 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 587 transitions. [2021-11-02 22:27:45,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.074074074074074) internal successors, (110), 23 states have internal predecessors, (110), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:27:45,024 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 587 transitions. [2021-11-02 22:27:45,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-02 22:27:45,025 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:27:45,026 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:27:45,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-02 22:27:45,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:45,242 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:27:45,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:27:45,242 INFO L85 PathProgramCache]: Analyzing trace with hash 2115197274, now seen corresponding path program 2 times [2021-11-02 22:27:45,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:27:45,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560197074] [2021-11-02 22:27:45,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:27:45,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:27:45,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:45,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:27:45,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:45,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-11-02 22:27:45,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:27:45,809 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:27:45,809 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:27:45,809 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560197074] [2021-11-02 22:27:45,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560197074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:45,810 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995393303] [2021-11-02 22:27:45,810 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:27:45,810 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:27:45,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:27:45,814 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:27:45,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-02 22:27:46,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:27:46,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:27:46,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-02 22:27:46,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:27:46,690 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 10 treesize of output 8 [2021-11-02 22:27:47,223 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 [2021-11-02 22:27:47,284 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 [2021-11-02 22:27:57,647 INFO L354 Elim1Store]: treesize reduction 61, result has 16.4 percent of original size [2021-11-02 22:27:57,647 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 47 treesize of output 34 [2021-11-02 22:27:57,693 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-02 22:27:57,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995393303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:27:57,693 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:27:57,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 37 [2021-11-02 22:27:57,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611946697] [2021-11-02 22:27:57,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:27:57,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:27:57,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:27:57,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1211, Unknown=7, NotChecked=0, Total=1332 [2021-11-02 22:27:57,695 INFO L87 Difference]: Start difference. First operand 504 states and 587 transitions. Second operand has 37 states, 36 states have (on average 2.75) internal successors, (99), 31 states have internal predecessors, (99), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:28:03,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:28:03,663 INFO L93 Difference]: Finished difference Result 517 states and 599 transitions. [2021-11-02 22:28:03,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:28:03,663 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.75) internal successors, (99), 31 states have internal predecessors, (99), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 75 [2021-11-02 22:28:03,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:28:03,666 INFO L225 Difference]: With dead ends: 517 [2021-11-02 22:28:03,666 INFO L226 Difference]: Without dead ends: 465 [2021-11-02 22:28:03,667 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=282, Invalid=2680, Unknown=8, NotChecked=0, Total=2970 [2021-11-02 22:28:03,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2021-11-02 22:28:03,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 465. [2021-11-02 22:28:03,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 417 states have (on average 1.1990407673860912) internal successors, (500), 425 states have internal predecessors, (500), 24 states have call successors, (24), 21 states have call predecessors, (24), 18 states have return successors, (21), 18 states have call predecessors, (21), 18 states have call successors, (21) [2021-11-02 22:28:03,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 545 transitions. [2021-11-02 22:28:03,679 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 545 transitions. Word has length 75 [2021-11-02 22:28:03,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:28:03,680 INFO L470 AbstractCegarLoop]: Abstraction has 465 states and 545 transitions. [2021-11-02 22:28:03,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.75) internal successors, (99), 31 states have internal predecessors, (99), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:28:03,680 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 545 transitions. [2021-11-02 22:28:03,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-02 22:28:03,682 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:28:03,682 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:28:03,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-02 22:28:03,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:03,896 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:28:03,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:28:03,896 INFO L85 PathProgramCache]: Analyzing trace with hash 2076747387, now seen corresponding path program 7 times [2021-11-02 22:28:03,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:28:03,896 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66934198] [2021-11-02 22:28:03,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:28:03,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:28:03,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:04,271 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:28:04,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:04,282 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-11-02 22:28:04,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:04,287 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:28:04,287 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:28:04,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66934198] [2021-11-02 22:28:04,287 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66934198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:04,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046976437] [2021-11-02 22:28:04,288 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:28:04,288 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:28:04,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:28:04,297 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:28:04,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-02 22:28:05,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:28:05,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-02 22:28:05,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:28:05,280 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 [2021-11-02 22:28:05,809 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 [2021-11-02 22:28:05,894 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:28:05,899 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 [2021-11-02 22:28:17,970 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-02 22:28:17,970 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 [2021-11-02 22:28:18,001 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 11 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:28:18,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046976437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:28:18,002 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:28:18,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 37 [2021-11-02 22:28:18,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331317614] [2021-11-02 22:28:18,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:28:18,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:28:18,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:28:18,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1236, Unknown=5, NotChecked=0, Total=1332 [2021-11-02 22:28:18,004 INFO L87 Difference]: Start difference. First operand 465 states and 545 transitions. Second operand has 37 states, 36 states have (on average 3.3055555555555554) internal successors, (119), 34 states have internal predecessors, (119), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:29:16,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:29:16,110 INFO L93 Difference]: Finished difference Result 757 states and 875 transitions. [2021-11-02 22:29:16,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:29:16,110 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 3.3055555555555554) internal successors, (119), 34 states have internal predecessors, (119), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 74 [2021-11-02 22:29:16,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:29:16,113 INFO L225 Difference]: With dead ends: 757 [2021-11-02 22:29:16,113 INFO L226 Difference]: Without dead ends: 655 [2021-11-02 22:29:16,114 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 620 ImplicationChecksByTransitivity, 52.1s TimeCoverageRelationStatistics Valid=307, Invalid=3336, Unknown=17, NotChecked=0, Total=3660 [2021-11-02 22:29:16,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-11-02 22:29:16,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 635. [2021-11-02 22:29:16,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 572 states have (on average 1.1888111888111887) internal successors, (680), 581 states have internal predecessors, (680), 34 states have call successors, (34), 29 states have call predecessors, (34), 23 states have return successors, (28), 24 states have call predecessors, (28), 24 states have call successors, (28) [2021-11-02 22:29:16,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 742 transitions. [2021-11-02 22:29:16,129 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 742 transitions. Word has length 74 [2021-11-02 22:29:16,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:29:16,130 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 742 transitions. [2021-11-02 22:29:16,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 3.3055555555555554) internal successors, (119), 34 states have internal predecessors, (119), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:29:16,130 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 742 transitions. [2021-11-02 22:29:16,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-02 22:29:16,132 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:29:16,132 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:29:16,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-02 22:29:16,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-02 22:29:16,358 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:29:16,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:29:16,358 INFO L85 PathProgramCache]: Analyzing trace with hash -205993435, now seen corresponding path program 2 times [2021-11-02 22:29:16,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:29:16,358 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415077050] [2021-11-02 22:29:16,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:29:16,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:29:16,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:16,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:29:16,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:16,664 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:29:16,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:16,669 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 35 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:29:16,669 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:29:16,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415077050] [2021-11-02 22:29:16,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415077050] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:16,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485533401] [2021-11-02 22:29:16,670 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:29:16,670 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:16,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:29:16,671 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:29:16,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-02 22:29:17,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:29:17,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:29:17,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-02 22:29:17,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:29:17,846 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:29:17,847 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 [2021-11-02 22:29:18,633 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 [2021-11-02 22:29:19,555 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:29:19,556 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 30 treesize of output 34 [2021-11-02 22:29:19,843 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 15 proven. 28 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:29:19,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485533401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:19,843 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:29:19,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 32 [2021-11-02 22:29:19,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820095793] [2021-11-02 22:29:19,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:29:19,844 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:29:19,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:29:19,845 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=972, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:29:19,845 INFO L87 Difference]: Start difference. First operand 635 states and 742 transitions. Second operand has 33 states, 31 states have (on average 3.870967741935484) internal successors, (120), 28 states have internal predecessors, (120), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:29:23,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:29:23,199 INFO L93 Difference]: Finished difference Result 721 states and 832 transitions. [2021-11-02 22:29:23,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:29:23,200 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 3.870967741935484) internal successors, (120), 28 states have internal predecessors, (120), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 78 [2021-11-02 22:29:23,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:29:23,204 INFO L225 Difference]: With dead ends: 721 [2021-11-02 22:29:23,204 INFO L226 Difference]: Without dead ends: 720 [2021-11-02 22:29:23,205 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=314, Invalid=2548, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:29:23,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-11-02 22:29:23,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 679. [2021-11-02 22:29:23,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 679 states, 613 states have (on average 1.1908646003262642) internal successors, (730), 622 states have internal predecessors, (730), 34 states have call successors, (34), 32 states have call predecessors, (34), 26 states have return successors, (28), 24 states have call predecessors, (28), 24 states have call successors, (28) [2021-11-02 22:29:23,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 679 states to 679 states and 792 transitions. [2021-11-02 22:29:23,224 INFO L78 Accepts]: Start accepts. Automaton has 679 states and 792 transitions. Word has length 78 [2021-11-02 22:29:23,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:29:23,224 INFO L470 AbstractCegarLoop]: Abstraction has 679 states and 792 transitions. [2021-11-02 22:29:23,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 3.870967741935484) internal successors, (120), 28 states have internal predecessors, (120), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:29:23,225 INFO L276 IsEmpty]: Start isEmpty. Operand 679 states and 792 transitions. [2021-11-02 22:29:23,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-02 22:29:23,227 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:29:23,227 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:29:23,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-02 22:29:23,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:23,442 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:29:23,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:29:23,442 INFO L85 PathProgramCache]: Analyzing trace with hash -918612323, now seen corresponding path program 3 times [2021-11-02 22:29:23,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:29:23,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574267481] [2021-11-02 22:29:23,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:29:23,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:29:23,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:23,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:29:23,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:23,728 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:29:23,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:29:23,735 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:29:23,735 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:29:23,735 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574267481] [2021-11-02 22:29:23,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1574267481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:23,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228225806] [2021-11-02 22:29:23,736 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:29:23,736 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:29:23,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:29:23,738 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:29:23,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-02 22:29:25,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-02 22:29:25,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:29:25,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-02 22:29:25,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:29:25,589 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 [2021-11-02 22:29:25,593 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 [2021-11-02 22:29:26,115 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 [2021-11-02 22:29:26,169 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-02 22:29:26,169 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 [2021-11-02 22:29:35,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:29:35,211 INFO L354 Elim1Store]: treesize reduction 91, result has 47.4 percent of original size [2021-11-02 22:29:35,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 76 treesize of output 118 [2021-11-02 22:29:35,551 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-02 22:29:35,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228225806] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:29:35,552 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:29:35,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 18] total 30 [2021-11-02 22:29:35,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642035651] [2021-11-02 22:29:35,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:29:35,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:29:35,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:29:35,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=853, Unknown=2, NotChecked=0, Total=930 [2021-11-02 22:29:35,553 INFO L87 Difference]: Start difference. First operand 679 states and 792 transitions. Second operand has 31 states, 29 states have (on average 3.5172413793103448) internal successors, (102), 26 states have internal predecessors, (102), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:30:14,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:14,945 INFO L93 Difference]: Finished difference Result 747 states and 868 transitions. [2021-11-02 22:30:14,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:30:14,946 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 3.5172413793103448) internal successors, (102), 26 states have internal predecessors, (102), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 79 [2021-11-02 22:30:14,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:14,948 INFO L225 Difference]: With dead ends: 747 [2021-11-02 22:30:14,948 INFO L226 Difference]: Without dead ends: 747 [2021-11-02 22:30:14,949 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=268, Invalid=2278, Unknown=4, NotChecked=0, Total=2550 [2021-11-02 22:30:14,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 747 states. [2021-11-02 22:30:14,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 747 to 703. [2021-11-02 22:30:14,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 703 states, 637 states have (on average 1.2025117739403455) internal successors, (766), 646 states have internal predecessors, (766), 34 states have call successors, (34), 32 states have call predecessors, (34), 26 states have return successors, (28), 24 states have call predecessors, (28), 24 states have call successors, (28) [2021-11-02 22:30:14,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 703 states to 703 states and 828 transitions. [2021-11-02 22:30:14,965 INFO L78 Accepts]: Start accepts. Automaton has 703 states and 828 transitions. Word has length 79 [2021-11-02 22:30:14,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:14,965 INFO L470 AbstractCegarLoop]: Abstraction has 703 states and 828 transitions. [2021-11-02 22:30:14,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 3.5172413793103448) internal successors, (102), 26 states have internal predecessors, (102), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:30:14,966 INFO L276 IsEmpty]: Start isEmpty. Operand 703 states and 828 transitions. [2021-11-02 22:30:14,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-02 22:30:14,967 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:14,968 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:15,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:15,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-02 22:30:15,194 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:30:15,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:15,194 INFO L85 PathProgramCache]: Analyzing trace with hash 593409240, now seen corresponding path program 8 times [2021-11-02 22:30:15,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:15,194 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660779647] [2021-11-02 22:30:15,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:15,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:15,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:15,581 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:15,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:15,584 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:30:15,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:15,590 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 18 proven. 65 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:30:15,590 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:15,590 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660779647] [2021-11-02 22:30:15,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660779647] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:15,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782231764] [2021-11-02 22:30:15,591 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:30:15,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:15,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:15,602 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:15,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-02 22:30:17,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:30:17,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:17,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-02 22:30:17,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:17,612 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:30:17,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782231764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:17,613 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:17,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2021-11-02 22:30:17,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408423527] [2021-11-02 22:30:17,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:30:17,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:17,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:30:17,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:30:17,615 INFO L87 Difference]: Start difference. First operand 703 states and 828 transitions. Second operand has 27 states, 26 states have (on average 4.115384615384615) internal successors, (107), 24 states have internal predecessors, (107), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:30:18,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:18,884 INFO L93 Difference]: Finished difference Result 737 states and 868 transitions. [2021-11-02 22:30:18,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:30:18,884 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.115384615384615) internal successors, (107), 24 states have internal predecessors, (107), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 78 [2021-11-02 22:30:18,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:18,887 INFO L225 Difference]: With dead ends: 737 [2021-11-02 22:30:18,887 INFO L226 Difference]: Without dead ends: 737 [2021-11-02 22:30:18,888 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=171, Invalid=1161, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:30:18,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 737 states. [2021-11-02 22:30:18,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 737 to 730. [2021-11-02 22:30:18,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 730 states, 661 states have (on average 1.199697428139183) internal successors, (793), 670 states have internal predecessors, (793), 37 states have call successors, (37), 32 states have call predecessors, (37), 26 states have return successors, (31), 27 states have call predecessors, (31), 27 states have call successors, (31) [2021-11-02 22:30:18,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 730 states to 730 states and 861 transitions. [2021-11-02 22:30:18,908 INFO L78 Accepts]: Start accepts. Automaton has 730 states and 861 transitions. Word has length 78 [2021-11-02 22:30:18,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:18,909 INFO L470 AbstractCegarLoop]: Abstraction has 730 states and 861 transitions. [2021-11-02 22:30:18,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.115384615384615) internal successors, (107), 24 states have internal predecessors, (107), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:30:18,909 INFO L276 IsEmpty]: Start isEmpty. Operand 730 states and 861 transitions. [2021-11-02 22:30:18,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-02 22:30:18,911 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:18,912 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:18,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:19,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-02 22:30:19,138 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting cstrncmpErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:30:19,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:19,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1976823486, now seen corresponding path program 1 times [2021-11-02 22:30:19,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:19,138 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683235399] [2021-11-02 22:30:19,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:19,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:19,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:19,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:19,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:19,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:30:19,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:19,427 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:30:19,427 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:19,427 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683235399] [2021-11-02 22:30:19,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683235399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:19,428 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343150698] [2021-11-02 22:30:19,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:19,428 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:19,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:19,429 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:19,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-02 22:30:20,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:20,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-02 22:30:20,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:21,278 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 18 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:30:21,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343150698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:21,279 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:21,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 24 [2021-11-02 22:30:21,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058188972] [2021-11-02 22:30:21,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-02 22:30:21,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:21,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-02 22:30:21,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:30:21,281 INFO L87 Difference]: Start difference. First operand 730 states and 861 transitions. Second operand has 25 states, 23 states have (on average 4.260869565217392) internal successors, (98), 21 states have internal predecessors, (98), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:30:36,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:36,378 INFO L93 Difference]: Finished difference Result 1047 states and 1221 transitions. [2021-11-02 22:30:36,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:30:36,378 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 4.260869565217392) internal successors, (98), 21 states have internal predecessors, (98), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 81 [2021-11-02 22:30:36,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:36,383 INFO L225 Difference]: With dead ends: 1047 [2021-11-02 22:30:36,383 INFO L226 Difference]: Without dead ends: 1047 [2021-11-02 22:30:36,383 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:30:36,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1047 states. [2021-11-02 22:30:36,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1047 to 757. [2021-11-02 22:30:36,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 757 states, 688 states have (on average 1.2063953488372092) internal successors, (830), 697 states have internal predecessors, (830), 37 states have call successors, (37), 32 states have call predecessors, (37), 26 states have return successors, (31), 27 states have call predecessors, (31), 27 states have call successors, (31) [2021-11-02 22:30:36,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 757 states to 757 states and 898 transitions. [2021-11-02 22:30:36,408 INFO L78 Accepts]: Start accepts. Automaton has 757 states and 898 transitions. Word has length 81 [2021-11-02 22:30:36,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:36,408 INFO L470 AbstractCegarLoop]: Abstraction has 757 states and 898 transitions. [2021-11-02 22:30:36,409 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 4.260869565217392) internal successors, (98), 21 states have internal predecessors, (98), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:30:36,409 INFO L276 IsEmpty]: Start isEmpty. Operand 757 states and 898 transitions. [2021-11-02 22:30:36,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-02 22:30:36,411 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:36,411 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:36,449 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:36,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-02 22:30:36,638 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting cstrncmpErr9REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:30:36,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:36,638 INFO L85 PathProgramCache]: Analyzing trace with hash 2021127175, now seen corresponding path program 2 times [2021-11-02 22:30:36,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:36,638 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413985251] [2021-11-02 22:30:36,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:36,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:36,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:36,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:36,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:36,912 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:30:36,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:36,916 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 35 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:30:36,916 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:36,916 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413985251] [2021-11-02 22:30:36,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [413985251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:36,917 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327979297] [2021-11-02 22:30:36,917 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:30:36,917 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:36,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:36,919 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:36,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-02 22:30:38,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:30:38,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:38,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-02 22:30:38,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:38,558 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-02 22:30:38,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327979297] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:30:38,559 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:30:38,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [16] total 22 [2021-11-02 22:30:38,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355919461] [2021-11-02 22:30:38,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:30:38,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:38,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:30:38,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=449, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:30:38,560 INFO L87 Difference]: Start difference. First operand 757 states and 898 transitions. Second operand has 8 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:30:38,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:38,737 INFO L93 Difference]: Finished difference Result 777 states and 902 transitions. [2021-11-02 22:30:38,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-02 22:30:38,758 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 82 [2021-11-02 22:30:38,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:38,761 INFO L225 Difference]: With dead ends: 777 [2021-11-02 22:30:38,761 INFO L226 Difference]: Without dead ends: 705 [2021-11-02 22:30:38,762 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=624, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:30:38,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2021-11-02 22:30:38,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 663. [2021-11-02 22:30:38,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 663 states, 605 states have (on average 1.1851239669421487) internal successors, (717), 612 states have internal predecessors, (717), 31 states have call successors, (31), 27 states have call predecessors, (31), 23 states have return successors, (27), 23 states have call predecessors, (27), 24 states have call successors, (27) [2021-11-02 22:30:38,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 663 states to 663 states and 775 transitions. [2021-11-02 22:30:38,786 INFO L78 Accepts]: Start accepts. Automaton has 663 states and 775 transitions. Word has length 82 [2021-11-02 22:30:38,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:38,787 INFO L470 AbstractCegarLoop]: Abstraction has 663 states and 775 transitions. [2021-11-02 22:30:38,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:30:38,787 INFO L276 IsEmpty]: Start isEmpty. Operand 663 states and 775 transitions. [2021-11-02 22:30:38,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-02 22:30:38,789 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:38,789 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:38,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:39,009 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-02 22:30:39,010 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:30:39,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:39,010 INFO L85 PathProgramCache]: Analyzing trace with hash 684547080, now seen corresponding path program 1 times [2021-11-02 22:30:39,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:39,010 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984812650] [2021-11-02 22:30:39,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:39,010 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:39,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:39,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:39,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:39,472 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:30:39,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:39,481 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:30:39,481 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:39,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984812650] [2021-11-02 22:30:39,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984812650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:39,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695266877] [2021-11-02 22:30:39,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:39,482 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:39,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:39,483 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:39,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-02 22:30:40,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:40,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-02 22:30:40,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:41,473 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 [2021-11-02 22:30:41,537 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:30:41,537 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 31 treesize of output 30 [2021-11-02 22:30:43,712 INFO L354 Elim1Store]: treesize reduction 101, result has 16.5 percent of original size [2021-11-02 22:30:43,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 59 treesize of output 46 [2021-11-02 22:30:43,770 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-02 22:30:43,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695266877] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:43,770 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:30:43,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 29] total 46 [2021-11-02 22:30:43,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632518010] [2021-11-02 22:30:43,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-02 22:30:43,771 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:43,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-02 22:30:43,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1934, Unknown=0, NotChecked=0, Total=2070 [2021-11-02 22:30:43,771 INFO L87 Difference]: Start difference. First operand 663 states and 775 transitions. Second operand has 46 states, 45 states have (on average 2.6) internal successors, (117), 40 states have internal predecessors, (117), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:30:47,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:30:47,893 INFO L93 Difference]: Finished difference Result 695 states and 802 transitions. [2021-11-02 22:30:47,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-02 22:30:47,893 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.6) internal successors, (117), 40 states have internal predecessors, (117), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 84 [2021-11-02 22:30:47,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:30:47,896 INFO L225 Difference]: With dead ends: 695 [2021-11-02 22:30:47,896 INFO L226 Difference]: Without dead ends: 659 [2021-11-02 22:30:47,897 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1577 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=481, Invalid=6325, Unknown=0, NotChecked=0, Total=6806 [2021-11-02 22:30:47,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-11-02 22:30:47,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 643. [2021-11-02 22:30:47,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 643 states, 586 states have (on average 1.1723549488054608) internal successors, (687), 592 states have internal predecessors, (687), 31 states have call successors, (31), 27 states have call predecessors, (31), 22 states have return successors, (26), 23 states have call predecessors, (26), 23 states have call successors, (26) [2021-11-02 22:30:47,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 744 transitions. [2021-11-02 22:30:47,910 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 744 transitions. Word has length 84 [2021-11-02 22:30:47,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:30:47,911 INFO L470 AbstractCegarLoop]: Abstraction has 643 states and 744 transitions. [2021-11-02 22:30:47,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.6) internal successors, (117), 40 states have internal predecessors, (117), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:30:47,911 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 744 transitions. [2021-11-02 22:30:47,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-02 22:30:47,913 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:30:47,913 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:30:47,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-02 22:30:48,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-02 22:30:48,142 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:30:48,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:30:48,142 INFO L85 PathProgramCache]: Analyzing trace with hash -564432627, now seen corresponding path program 9 times [2021-11-02 22:30:48,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:30:48,142 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477932284] [2021-11-02 22:30:48,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:30:48,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:30:48,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:48,626 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:30:48,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:48,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:30:48,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:30:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 14 proven. 91 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:30:48,637 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:30:48,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477932284] [2021-11-02 22:30:48,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477932284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:30:48,637 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135185152] [2021-11-02 22:30:48,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:30:48,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:30:48,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:30:48,638 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:30:48,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-02 22:30:50,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-02 22:30:50,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:30:50,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-02 22:30:50,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:30:50,183 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 [2021-11-02 22:30:50,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:30:50,643 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:30:50,643 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 [2021-11-02 22:30:59,347 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [main_~length1~0] [2021-11-02 22:30:59,348 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:30:59,348 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2021-11-02 22:30:59,348 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15610260] [2021-11-02 22:30:59,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-02 22:30:59,348 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:30:59,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-02 22:30:59,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=1171, Unknown=3, NotChecked=0, Total=1260 [2021-11-02 22:30:59,349 INFO L87 Difference]: Start difference. First operand 643 states and 744 transitions. Second operand has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 20 states have internal predecessors, (73), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:31:34,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:31:34,056 INFO L93 Difference]: Finished difference Result 818 states and 950 transitions. [2021-11-02 22:31:34,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:31:34,056 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 20 states have internal predecessors, (73), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 83 [2021-11-02 22:31:34,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:31:34,061 INFO L225 Difference]: With dead ends: 818 [2021-11-02 22:31:34,061 INFO L226 Difference]: Without dead ends: 754 [2021-11-02 22:31:34,061 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 42.0s TimeCoverageRelationStatistics Valid=185, Invalid=2446, Unknown=21, NotChecked=0, Total=2652 [2021-11-02 22:31:34,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-11-02 22:31:34,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 751. [2021-11-02 22:31:34,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 751 states, 682 states have (on average 1.1612903225806452) internal successors, (792), 690 states have internal predecessors, (792), 43 states have call successors, (43), 29 states have call predecessors, (43), 22 states have return successors, (35), 31 states have call predecessors, (35), 31 states have call successors, (35) [2021-11-02 22:31:34,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 751 states to 751 states and 870 transitions. [2021-11-02 22:31:34,078 INFO L78 Accepts]: Start accepts. Automaton has 751 states and 870 transitions. Word has length 83 [2021-11-02 22:31:34,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:31:34,078 INFO L470 AbstractCegarLoop]: Abstraction has 751 states and 870 transitions. [2021-11-02 22:31:34,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 3.3181818181818183) internal successors, (73), 20 states have internal predecessors, (73), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:31:34,079 INFO L276 IsEmpty]: Start isEmpty. Operand 751 states and 870 transitions. [2021-11-02 22:31:34,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-02 22:31:34,081 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:31:34,082 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:31:34,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-02 22:31:34,289 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:34,290 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting cstrncmpErr7REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:31:34,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:31:34,290 INFO L85 PathProgramCache]: Analyzing trace with hash 2026894400, now seen corresponding path program 1 times [2021-11-02 22:31:34,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:31:34,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369979686] [2021-11-02 22:31:34,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:34,290 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:31:34,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:34,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:31:34,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:34,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:31:34,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:34,640 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:31:34,641 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:31:34,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369979686] [2021-11-02 22:31:34,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369979686] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:34,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819387867] [2021-11-02 22:31:34,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:34,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:34,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:31:34,643 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:31:34,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-02 22:31:36,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:36,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 358 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-02 22:31:36,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:31:36,854 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-02 22:31:36,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819387867] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:36,854 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:31:36,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 25 [2021-11-02 22:31:36,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137103756] [2021-11-02 22:31:36,855 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:31:36,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:31:36,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:31:36,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:31:36,856 INFO L87 Difference]: Start difference. First operand 751 states and 870 transitions. Second operand has 26 states, 24 states have (on average 4.25) internal successors, (102), 22 states have internal predecessors, (102), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:31:54,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:31:54,064 INFO L93 Difference]: Finished difference Result 1091 states and 1274 transitions. [2021-11-02 22:31:54,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:31:54,071 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 4.25) internal successors, (102), 22 states have internal predecessors, (102), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 85 [2021-11-02 22:31:54,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:31:54,077 INFO L225 Difference]: With dead ends: 1091 [2021-11-02 22:31:54,077 INFO L226 Difference]: Without dead ends: 1088 [2021-11-02 22:31:54,078 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:31:54,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1088 states. [2021-11-02 22:31:54,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1088 to 757. [2021-11-02 22:31:54,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 757 states, 688 states have (on average 1.1671511627906976) internal successors, (803), 696 states have internal predecessors, (803), 43 states have call successors, (43), 29 states have call predecessors, (43), 22 states have return successors, (35), 31 states have call predecessors, (35), 31 states have call successors, (35) [2021-11-02 22:31:54,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 757 states to 757 states and 881 transitions. [2021-11-02 22:31:54,105 INFO L78 Accepts]: Start accepts. Automaton has 757 states and 881 transitions. Word has length 85 [2021-11-02 22:31:54,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:31:54,105 INFO L470 AbstractCegarLoop]: Abstraction has 757 states and 881 transitions. [2021-11-02 22:31:54,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 4.25) internal successors, (102), 22 states have internal predecessors, (102), 4 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:31:54,105 INFO L276 IsEmpty]: Start isEmpty. Operand 757 states and 881 transitions. [2021-11-02 22:31:54,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-02 22:31:54,108 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:31:54,108 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:31:54,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-02 22:31:54,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:54,334 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:31:54,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:31:54,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1803255360, now seen corresponding path program 4 times [2021-11-02 22:31:54,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:31:54,334 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000745538] [2021-11-02 22:31:54,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:31:54,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:31:54,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:54,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:31:54,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:54,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-11-02 22:31:54,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:31:54,580 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-02 22:31:54,580 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:31:54,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000745538] [2021-11-02 22:31:54,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000745538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:54,580 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783360824] [2021-11-02 22:31:54,581 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:31:54,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:31:54,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:31:54,582 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:31:54,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-02 22:31:56,134 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:31:56,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:31:56,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-02 22:31:56,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:31:56,162 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 [2021-11-02 22:31:56,168 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 [2021-11-02 22:31:56,436 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 19 treesize of output 13 [2021-11-02 22:31:56,782 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 [2021-11-02 22:31:56,832 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 33 treesize of output 32 [2021-11-02 22:31:59,547 INFO L354 Elim1Store]: treesize reduction 68, result has 15.0 percent of original size [2021-11-02 22:31:59,548 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 58 treesize of output 44 [2021-11-02 22:31:59,618 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:31:59,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783360824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:31:59,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:31:59,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 27] total 38 [2021-11-02 22:31:59,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710640229] [2021-11-02 22:31:59,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:31:59,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:31:59,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:31:59,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=1314, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:31:59,620 INFO L87 Difference]: Start difference. First operand 757 states and 881 transitions. Second operand has 38 states, 37 states have (on average 3.324324324324324) internal successors, (123), 32 states have internal predecessors, (123), 5 states have call successors, (9), 6 states have call predecessors, (9), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:32:08,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:08,246 INFO L93 Difference]: Finished difference Result 1109 states and 1287 transitions. [2021-11-02 22:32:08,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-02 22:32:08,248 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 3.324324324324324) internal successors, (123), 32 states have internal predecessors, (123), 5 states have call successors, (9), 6 states have call predecessors, (9), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 87 [2021-11-02 22:32:08,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:08,252 INFO L225 Difference]: With dead ends: 1109 [2021-11-02 22:32:08,252 INFO L226 Difference]: Without dead ends: 1013 [2021-11-02 22:32:08,253 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1379 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=518, Invalid=6791, Unknown=1, NotChecked=0, Total=7310 [2021-11-02 22:32:08,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1013 states. [2021-11-02 22:32:08,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1013 to 958. [2021-11-02 22:32:08,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 958 states, 874 states have (on average 1.1762013729977117) internal successors, (1028), 882 states have internal predecessors, (1028), 52 states have call successors, (52), 32 states have call predecessors, (52), 28 states have return successors, (47), 43 states have call predecessors, (47), 40 states have call successors, (47) [2021-11-02 22:32:08,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 958 states to 958 states and 1127 transitions. [2021-11-02 22:32:08,280 INFO L78 Accepts]: Start accepts. Automaton has 958 states and 1127 transitions. Word has length 87 [2021-11-02 22:32:08,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:08,280 INFO L470 AbstractCegarLoop]: Abstraction has 958 states and 1127 transitions. [2021-11-02 22:32:08,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 3.324324324324324) internal successors, (123), 32 states have internal predecessors, (123), 5 states have call successors, (9), 6 states have call predecessors, (9), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:32:08,281 INFO L276 IsEmpty]: Start isEmpty. Operand 958 states and 1127 transitions. [2021-11-02 22:32:08,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-02 22:32:08,283 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:08,284 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:08,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:08,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-02 22:32:08,510 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:32:08,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:08,510 INFO L85 PathProgramCache]: Analyzing trace with hash -1578376099, now seen corresponding path program 3 times [2021-11-02 22:32:08,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:08,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896585770] [2021-11-02 22:32:08,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:08,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:08,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:08,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:08,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:08,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-11-02 22:32:08,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:08,892 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 18 proven. 57 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:32:08,893 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:08,893 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896585770] [2021-11-02 22:32:08,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896585770] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:08,893 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11213197] [2021-11-02 22:32:08,893 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:32:08,894 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:08,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:08,895 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:08,917 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-02 22:32:10,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:32:10,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:10,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-02 22:32:10,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:10,861 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 [2021-11-02 22:32:10,867 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 [2021-11-02 22:32:11,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:32:11,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-02 22:32:20,064 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [main_~nondetString2~0.offset] [2021-11-02 22:32:20,064 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:32:20,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-11-02 22:32:20,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523021579] [2021-11-02 22:32:20,064 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:32:20,064 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:20,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:32:20,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=636, Unknown=1, NotChecked=0, Total=702 [2021-11-02 22:32:20,065 INFO L87 Difference]: Start difference. First operand 958 states and 1127 transitions. Second operand has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 15 states have internal predecessors, (71), 4 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:32:21,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:21,600 INFO L93 Difference]: Finished difference Result 1053 states and 1235 transitions. [2021-11-02 22:32:21,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:32:21,601 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 15 states have internal predecessors, (71), 4 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 87 [2021-11-02 22:32:21,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:21,609 INFO L225 Difference]: With dead ends: 1053 [2021-11-02 22:32:21,609 INFO L226 Difference]: Without dead ends: 1010 [2021-11-02 22:32:21,609 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=124, Invalid=1207, Unknown=1, NotChecked=0, Total=1332 [2021-11-02 22:32:21,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1010 states. [2021-11-02 22:32:21,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1010 to 993. [2021-11-02 22:32:21,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 993 states, 911 states have (on average 1.1866081229418222) internal successors, (1081), 918 states have internal predecessors, (1081), 46 states have call successors, (46), 35 states have call predecessors, (46), 32 states have return successors, (42), 39 states have call predecessors, (42), 36 states have call successors, (42) [2021-11-02 22:32:21,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 993 states to 993 states and 1169 transitions. [2021-11-02 22:32:21,639 INFO L78 Accepts]: Start accepts. Automaton has 993 states and 1169 transitions. Word has length 87 [2021-11-02 22:32:21,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:21,639 INFO L470 AbstractCegarLoop]: Abstraction has 993 states and 1169 transitions. [2021-11-02 22:32:21,640 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 4.176470588235294) internal successors, (71), 15 states have internal predecessors, (71), 4 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:32:21,640 INFO L276 IsEmpty]: Start isEmpty. Operand 993 states and 1169 transitions. [2021-11-02 22:32:21,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-02 22:32:21,642 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:21,643 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:21,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:21,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:21,860 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:32:21,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:21,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1707006501, now seen corresponding path program 2 times [2021-11-02 22:32:21,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:21,861 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199654574] [2021-11-02 22:32:21,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:21,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:21,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:22,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:22,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-11-02 22:32:22,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:22,398 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 8 proven. 26 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:32:22,398 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:22,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199654574] [2021-11-02 22:32:22,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199654574] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:22,399 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045999967] [2021-11-02 22:32:22,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:32:22,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:22,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:22,402 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:22,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-02 22:32:24,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:32:24,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:24,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-02 22:32:24,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:24,733 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:32:24,733 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 [2021-11-02 22:32:24,735 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 15 treesize of output 13 [2021-11-02 22:32:25,585 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 15 proven. 19 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:32:25,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045999967] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:25,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:25,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 29 [2021-11-02 22:32:25,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593751532] [2021-11-02 22:32:25,586 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-02 22:32:25,586 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:25,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-02 22:32:25,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=777, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:32:25,586 INFO L87 Difference]: Start difference. First operand 993 states and 1169 transitions. Second operand has 30 states, 29 states have (on average 4.344827586206897) internal successors, (126), 25 states have internal predecessors, (126), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:32:35,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:35,016 INFO L93 Difference]: Finished difference Result 1017 states and 1196 transitions. [2021-11-02 22:32:35,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:32:35,027 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 4.344827586206897) internal successors, (126), 25 states have internal predecessors, (126), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 88 [2021-11-02 22:32:35,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:35,032 INFO L225 Difference]: With dead ends: 1017 [2021-11-02 22:32:35,033 INFO L226 Difference]: Without dead ends: 1017 [2021-11-02 22:32:35,033 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=217, Invalid=1675, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:32:35,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1017 states. [2021-11-02 22:32:35,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1017 to 993. [2021-11-02 22:32:35,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 993 states, 911 states have (on average 1.1844127332601537) internal successors, (1079), 918 states have internal predecessors, (1079), 46 states have call successors, (46), 35 states have call predecessors, (46), 32 states have return successors, (42), 39 states have call predecessors, (42), 36 states have call successors, (42) [2021-11-02 22:32:35,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 993 states to 993 states and 1167 transitions. [2021-11-02 22:32:35,055 INFO L78 Accepts]: Start accepts. Automaton has 993 states and 1167 transitions. Word has length 88 [2021-11-02 22:32:35,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:35,056 INFO L470 AbstractCegarLoop]: Abstraction has 993 states and 1167 transitions. [2021-11-02 22:32:35,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 4.344827586206897) internal successors, (126), 25 states have internal predecessors, (126), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:32:35,056 INFO L276 IsEmpty]: Start isEmpty. Operand 993 states and 1167 transitions. [2021-11-02 22:32:35,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-02 22:32:35,058 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:35,058 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:35,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:35,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:35,274 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:32:35,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:35,274 INFO L85 PathProgramCache]: Analyzing trace with hash 576928592, now seen corresponding path program 10 times [2021-11-02 22:32:35,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:35,274 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928933170] [2021-11-02 22:32:35,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:35,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:35,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:35,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:35,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:35,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-11-02 22:32:35,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 32 proven. 94 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:32:35,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:35,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928933170] [2021-11-02 22:32:35,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928933170] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:35,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691743619] [2021-11-02 22:32:35,655 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:32:35,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:35,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:35,662 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:35,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-02 22:32:37,461 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:32:37,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:37,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-02 22:32:37,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:38,050 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 50 proven. 76 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:32:38,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691743619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:38,050 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:38,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 28 [2021-11-02 22:32:38,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579014999] [2021-11-02 22:32:38,051 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-02 22:32:38,051 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:38,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-02 22:32:38,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:32:38,052 INFO L87 Difference]: Start difference. First operand 993 states and 1167 transitions. Second operand has 29 states, 28 states have (on average 4.285714285714286) internal successors, (120), 26 states have internal predecessors, (120), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:32:39,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:32:39,491 INFO L93 Difference]: Finished difference Result 1038 states and 1220 transitions. [2021-11-02 22:32:39,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:32:39,492 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 4.285714285714286) internal successors, (120), 26 states have internal predecessors, (120), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 87 [2021-11-02 22:32:39,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:32:39,499 INFO L225 Difference]: With dead ends: 1038 [2021-11-02 22:32:39,499 INFO L226 Difference]: Without dead ends: 1038 [2021-11-02 22:32:39,500 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=1297, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:32:39,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1038 states. [2021-11-02 22:32:39,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1038 to 1029. [2021-11-02 22:32:39,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1029 states, 943 states have (on average 1.1823966065747613) internal successors, (1115), 950 states have internal predecessors, (1115), 50 states have call successors, (50), 35 states have call predecessors, (50), 32 states have return successors, (46), 43 states have call predecessors, (46), 40 states have call successors, (46) [2021-11-02 22:32:39,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1029 states to 1029 states and 1211 transitions. [2021-11-02 22:32:39,531 INFO L78 Accepts]: Start accepts. Automaton has 1029 states and 1211 transitions. Word has length 87 [2021-11-02 22:32:39,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:32:39,531 INFO L470 AbstractCegarLoop]: Abstraction has 1029 states and 1211 transitions. [2021-11-02 22:32:39,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 4.285714285714286) internal successors, (120), 26 states have internal predecessors, (120), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:32:39,532 INFO L276 IsEmpty]: Start isEmpty. Operand 1029 states and 1211 transitions. [2021-11-02 22:32:39,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-02 22:32:39,535 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:32:39,535 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:32:39,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-02 22:32:39,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-02 22:32:39,750 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:32:39,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:32:39,750 INFO L85 PathProgramCache]: Analyzing trace with hash 750947712, now seen corresponding path program 3 times [2021-11-02 22:32:39,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:32:39,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030510743] [2021-11-02 22:32:39,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:32:39,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:32:39,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:40,441 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:32:40,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:40,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-11-02 22:32:40,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:32:40,455 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 1 proven. 43 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-02 22:32:40,455 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:32:40,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030510743] [2021-11-02 22:32:40,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030510743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:40,455 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002777795] [2021-11-02 22:32:40,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:32:40,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:32:40,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:32:40,457 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:32:40,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-02 22:32:42,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:32:42,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:32:42,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-02 22:32:42,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:32:42,565 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:32:42,565 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 [2021-11-02 22:32:42,573 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 [2021-11-02 22:32:43,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-02 22:32:43,080 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-02 22:32:43,080 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 [2021-11-02 22:32:50,374 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-02 22:32:50,374 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 37 treesize of output 24 [2021-11-02 22:32:50,481 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-02 22:32:50,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002777795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:32:50,481 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:32:50,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 14] total 34 [2021-11-02 22:32:50,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53015094] [2021-11-02 22:32:50,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 22:32:50,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:32:50,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 22:32:50,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1039, Unknown=2, NotChecked=0, Total=1122 [2021-11-02 22:32:50,484 INFO L87 Difference]: Start difference. First operand 1029 states and 1211 transitions. Second operand has 34 states, 33 states have (on average 3.606060606060606) internal successors, (119), 29 states have internal predecessors, (119), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:43,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:43,411 INFO L93 Difference]: Finished difference Result 1132 states and 1313 transitions. [2021-11-02 22:33:43,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-02 22:33:43,412 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.606060606060606) internal successors, (119), 29 states have internal predecessors, (119), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 93 [2021-11-02 22:33:43,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:43,416 INFO L225 Difference]: With dead ends: 1132 [2021-11-02 22:33:43,416 INFO L226 Difference]: Without dead ends: 993 [2021-11-02 22:33:43,417 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 41.6s TimeCoverageRelationStatistics Valid=514, Invalid=5333, Unknown=5, NotChecked=0, Total=5852 [2021-11-02 22:33:43,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 993 states. [2021-11-02 22:33:43,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 993 to 895. [2021-11-02 22:33:43,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 895 states, 819 states have (on average 1.1758241758241759) internal successors, (963), 827 states have internal predecessors, (963), 42 states have call successors, (42), 32 states have call predecessors, (42), 30 states have return successors, (38), 35 states have call predecessors, (38), 34 states have call successors, (38) [2021-11-02 22:33:43,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 895 states to 895 states and 1043 transitions. [2021-11-02 22:33:43,439 INFO L78 Accepts]: Start accepts. Automaton has 895 states and 1043 transitions. Word has length 93 [2021-11-02 22:33:43,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:43,440 INFO L470 AbstractCegarLoop]: Abstraction has 895 states and 1043 transitions. [2021-11-02 22:33:43,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.606060606060606) internal successors, (119), 29 states have internal predecessors, (119), 7 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:43,440 INFO L276 IsEmpty]: Start isEmpty. Operand 895 states and 1043 transitions. [2021-11-02 22:33:43,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-02 22:33:43,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:43,442 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:43,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:43,657 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:43,658 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:33:43,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:43,658 INFO L85 PathProgramCache]: Analyzing trace with hash 402666901, now seen corresponding path program 11 times [2021-11-02 22:33:43,658 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:43,658 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037183761] [2021-11-02 22:33:43,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:43,658 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:43,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:44,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-11-02 22:33:44,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,295 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 17 proven. 136 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:33:44,295 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:44,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037183761] [2021-11-02 22:33:44,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037183761] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:44,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046705311] [2021-11-02 22:33:44,295 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:33:44,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:44,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:44,310 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:44,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-02 22:33:46,258 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-02 22:33:46,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:46,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-02 22:33:46,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:46,887 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 [2021-11-02 22:33:46,961 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:33:46,961 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 31 treesize of output 30 [2021-11-02 22:33:49,569 INFO L354 Elim1Store]: treesize reduction 81, result has 16.5 percent of original size [2021-11-02 22:33:49,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 44 treesize of output 35 [2021-11-02 22:33:49,588 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 17 proven. 136 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:33:49,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046705311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:49,589 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:49,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 29] total 49 [2021-11-02 22:33:49,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497887460] [2021-11-02 22:33:49,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:33:49,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:49,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:33:49,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2217, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:33:49,591 INFO L87 Difference]: Start difference. First operand 895 states and 1043 transitions. Second operand has 49 states, 48 states have (on average 3.2291666666666665) internal successors, (155), 46 states have internal predecessors, (155), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:55,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:55,807 INFO L93 Difference]: Finished difference Result 1743 states and 2029 transitions. [2021-11-02 22:33:55,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-02 22:33:55,808 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 3.2291666666666665) internal successors, (155), 46 states have internal predecessors, (155), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 92 [2021-11-02 22:33:55,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:55,813 INFO L225 Difference]: With dead ends: 1743 [2021-11-02 22:33:55,813 INFO L226 Difference]: Without dead ends: 1527 [2021-11-02 22:33:55,814 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1753 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=518, Invalid=7672, Unknown=0, NotChecked=0, Total=8190 [2021-11-02 22:33:55,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1527 states. [2021-11-02 22:33:55,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1527 to 1410. [2021-11-02 22:33:55,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1410 states, 1300 states have (on average 1.1792307692307693) internal successors, (1533), 1310 states have internal predecessors, (1533), 60 states have call successors, (60), 50 states have call predecessors, (60), 46 states have return successors, (54), 49 states have call predecessors, (54), 48 states have call successors, (54) [2021-11-02 22:33:55,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1410 states to 1410 states and 1647 transitions. [2021-11-02 22:33:55,853 INFO L78 Accepts]: Start accepts. Automaton has 1410 states and 1647 transitions. Word has length 92 [2021-11-02 22:33:55,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:55,854 INFO L470 AbstractCegarLoop]: Abstraction has 1410 states and 1647 transitions. [2021-11-02 22:33:55,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 3.2291666666666665) internal successors, (155), 46 states have internal predecessors, (155), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:55,854 INFO L276 IsEmpty]: Start isEmpty. Operand 1410 states and 1647 transitions. [2021-11-02 22:33:55,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-02 22:33:55,856 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:55,857 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:55,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:56,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:56,070 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting cstrncmpErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:33:56,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:56,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1482248535, now seen corresponding path program 2 times [2021-11-02 22:33:56,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:56,070 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436182731] [2021-11-02 22:33:56,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:56,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:56,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:56,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:56,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:56,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-11-02 22:33:56,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:56,393 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 6 proven. 36 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-02 22:33:56,393 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:56,393 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436182731] [2021-11-02 22:33:56,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436182731] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:56,394 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100806513] [2021-11-02 22:33:56,394 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:33:56,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:56,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:56,395 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:56,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-02 22:33:58,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:33:58,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:58,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-02 22:33:58,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:58,712 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:58,712 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 [2021-11-02 22:33:59,520 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 31 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-02 22:33:59,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100806513] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:59,521 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:59,521 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 33 [2021-11-02 22:33:59,521 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1742429621] [2021-11-02 22:33:59,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:33:59,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:59,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:33:59,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=943, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:33:59,522 INFO L87 Difference]: Start difference. First operand 1410 states and 1647 transitions. Second operand has 33 states, 32 states have (on average 4.15625) internal successors, (133), 28 states have internal predecessors, (133), 6 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:34:08,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:08,777 INFO L93 Difference]: Finished difference Result 2946 states and 3373 transitions. [2021-11-02 22:34:08,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:34:08,778 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 4.15625) internal successors, (133), 28 states have internal predecessors, (133), 6 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 96 [2021-11-02 22:34:08,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:08,791 INFO L225 Difference]: With dead ends: 2946 [2021-11-02 22:34:08,791 INFO L226 Difference]: Without dead ends: 2897 [2021-11-02 22:34:08,792 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1098 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=403, Invalid=3757, Unknown=0, NotChecked=0, Total=4160 [2021-11-02 22:34:08,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2897 states. [2021-11-02 22:34:08,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2897 to 1552. [2021-11-02 22:34:08,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1552 states, 1433 states have (on average 1.1800418702023727) internal successors, (1691), 1448 states have internal predecessors, (1691), 64 states have call successors, (64), 54 states have call predecessors, (64), 51 states have return successors, (59), 49 states have call predecessors, (59), 50 states have call successors, (59) [2021-11-02 22:34:08,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1552 states to 1552 states and 1814 transitions. [2021-11-02 22:34:08,847 INFO L78 Accepts]: Start accepts. Automaton has 1552 states and 1814 transitions. Word has length 96 [2021-11-02 22:34:08,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:08,847 INFO L470 AbstractCegarLoop]: Abstraction has 1552 states and 1814 transitions. [2021-11-02 22:34:08,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 4.15625) internal successors, (133), 28 states have internal predecessors, (133), 6 states have call successors, (9), 7 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:34:08,848 INFO L276 IsEmpty]: Start isEmpty. Operand 1552 states and 1814 transitions. [2021-11-02 22:34:08,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-02 22:34:08,850 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:08,850 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:08,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:09,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-02 22:34:09,065 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:34:09,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:09,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1955286017, now seen corresponding path program 4 times [2021-11-02 22:34:09,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:09,066 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792690937] [2021-11-02 22:34:09,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:09,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:09,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:09,371 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:09,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:09,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:34:09,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:09,379 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 32 proven. 84 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:34:09,379 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:09,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792690937] [2021-11-02 22:34:09,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792690937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:09,379 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737234817] [2021-11-02 22:34:09,379 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:34:09,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:09,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:09,380 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:09,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-02 22:34:11,484 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:34:11,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:11,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-02 22:34:11,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:12,065 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 50 proven. 66 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:34:12,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737234817] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:12,065 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:12,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 29 [2021-11-02 22:34:12,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320253055] [2021-11-02 22:34:12,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-02 22:34:12,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:12,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-02 22:34:12,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=763, Unknown=0, NotChecked=0, Total=870 [2021-11-02 22:34:12,066 INFO L87 Difference]: Start difference. First operand 1552 states and 1814 transitions. Second operand has 30 states, 29 states have (on average 4.241379310344827) internal successors, (123), 26 states have internal predecessors, (123), 6 states have call successors, (8), 5 states have call predecessors, (8), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:34:13,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:13,463 INFO L93 Difference]: Finished difference Result 1653 states and 1926 transitions. [2021-11-02 22:34:13,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 22:34:13,464 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 4.241379310344827) internal successors, (123), 26 states have internal predecessors, (123), 6 states have call successors, (8), 5 states have call predecessors, (8), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 96 [2021-11-02 22:34:13,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:13,474 INFO L225 Difference]: With dead ends: 1653 [2021-11-02 22:34:13,474 INFO L226 Difference]: Without dead ends: 1357 [2021-11-02 22:34:13,475 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=190, Invalid=1450, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:34:13,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1357 states. [2021-11-02 22:34:13,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1357 to 1341. [2021-11-02 22:34:13,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1341 states, 1244 states have (on average 1.1889067524115755) internal successors, (1479), 1255 states have internal predecessors, (1479), 51 states have call successors, (51), 45 states have call predecessors, (51), 42 states have return successors, (46), 40 states have call predecessors, (46), 40 states have call successors, (46) [2021-11-02 22:34:13,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1341 states to 1341 states and 1576 transitions. [2021-11-02 22:34:13,512 INFO L78 Accepts]: Start accepts. Automaton has 1341 states and 1576 transitions. Word has length 96 [2021-11-02 22:34:13,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:13,522 INFO L470 AbstractCegarLoop]: Abstraction has 1341 states and 1576 transitions. [2021-11-02 22:34:13,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 4.241379310344827) internal successors, (123), 26 states have internal predecessors, (123), 6 states have call successors, (8), 5 states have call predecessors, (8), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:34:13,523 INFO L276 IsEmpty]: Start isEmpty. Operand 1341 states and 1576 transitions. [2021-11-02 22:34:13,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-02 22:34:13,526 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:13,526 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:13,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:13,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:13,727 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:34:13,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:13,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1314145970, now seen corresponding path program 12 times [2021-11-02 22:34:13,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:13,728 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106527064] [2021-11-02 22:34:13,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:13,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:13,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,298 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:14,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:34:14,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,307 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 50 proven. 128 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:14,308 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:14,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106527064] [2021-11-02 22:34:14,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106527064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:14,308 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007050971] [2021-11-02 22:34:14,308 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:34:14,308 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:14,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:14,309 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:14,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-02 22:34:17,035 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-02 22:34:17,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:17,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-02 22:34:17,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:17,809 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 72 proven. 106 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:17,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007050971] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:17,810 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:17,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 38 [2021-11-02 22:34:17,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496913860] [2021-11-02 22:34:17,810 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:34:17,810 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:17,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:34:17,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1291, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:34:17,811 INFO L87 Difference]: Start difference. First operand 1341 states and 1576 transitions. Second operand has 39 states, 38 states have (on average 4.2894736842105265) internal successors, (163), 36 states have internal predecessors, (163), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:34:19,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:19,306 INFO L93 Difference]: Finished difference Result 1386 states and 1629 transitions. [2021-11-02 22:34:19,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:34:19,307 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 4.2894736842105265) internal successors, (163), 36 states have internal predecessors, (163), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 96 [2021-11-02 22:34:19,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:19,312 INFO L225 Difference]: With dead ends: 1386 [2021-11-02 22:34:19,313 INFO L226 Difference]: Without dead ends: 1386 [2021-11-02 22:34:19,313 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 662 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=378, Invalid=2592, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:34:19,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1386 states. [2021-11-02 22:34:19,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1386 to 1377. [2021-11-02 22:34:19,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1377 states, 1276 states have (on average 1.1873040752351096) internal successors, (1515), 1287 states have internal predecessors, (1515), 55 states have call successors, (55), 45 states have call predecessors, (55), 42 states have return successors, (50), 44 states have call predecessors, (50), 44 states have call successors, (50) [2021-11-02 22:34:19,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1377 states to 1377 states and 1620 transitions. [2021-11-02 22:34:19,335 INFO L78 Accepts]: Start accepts. Automaton has 1377 states and 1620 transitions. Word has length 96 [2021-11-02 22:34:19,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:19,335 INFO L470 AbstractCegarLoop]: Abstraction has 1377 states and 1620 transitions. [2021-11-02 22:34:19,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 4.2894736842105265) internal successors, (163), 36 states have internal predecessors, (163), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:34:19,336 INFO L276 IsEmpty]: Start isEmpty. Operand 1377 states and 1620 transitions. [2021-11-02 22:34:19,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-02 22:34:19,338 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:19,339 INFO L513 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:19,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:19,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-02 22:34:19,554 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:34:19,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:19,554 INFO L85 PathProgramCache]: Analyzing trace with hash 658044787, now seen corresponding path program 13 times [2021-11-02 22:34:19,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:19,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848406842] [2021-11-02 22:34:19,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:19,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:19,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:20,270 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:20,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:20,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:34:20,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:20,280 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 20 proven. 190 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:20,280 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:20,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848406842] [2021-11-02 22:34:20,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848406842] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:20,281 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108666106] [2021-11-02 22:34:20,281 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:34:20,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:20,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:20,286 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:20,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-02 22:34:22,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:22,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-02 22:34:22,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:22,874 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 [2021-11-02 22:34:23,491 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 [2021-11-02 22:34:23,556 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:34:23,556 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 [2021-11-02 22:34:34,023 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [main_~length1~0] [2021-11-02 22:34:34,023 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:34:34,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2021-11-02 22:34:34,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397235830] [2021-11-02 22:34:34,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:34:34,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:34,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:34:34,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1617, Unknown=6, NotChecked=0, Total=1722 [2021-11-02 22:34:34,024 INFO L87 Difference]: Start difference. First operand 1377 states and 1620 transitions. Second operand has 26 states, 26 states have (on average 3.5) internal successors, (91), 24 states have internal predecessors, (91), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:15,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:15,377 INFO L93 Difference]: Finished difference Result 1678 states and 1980 transitions. [2021-11-02 22:35:15,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-02 22:35:15,377 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.5) internal successors, (91), 24 states have internal predecessors, (91), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 101 [2021-11-02 22:35:15,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:15,384 INFO L225 Difference]: With dead ends: 1678 [2021-11-02 22:35:15,384 INFO L226 Difference]: Without dead ends: 1589 [2021-11-02 22:35:15,385 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 50.4s TimeCoverageRelationStatistics Valid=225, Invalid=3654, Unknown=27, NotChecked=0, Total=3906 [2021-11-02 22:35:15,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1589 states. [2021-11-02 22:35:15,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1589 to 1586. [2021-11-02 22:35:15,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1586 states, 1461 states have (on average 1.1765913757700206) internal successors, (1719), 1475 states have internal predecessors, (1719), 79 states have call successors, (79), 48 states have call predecessors, (79), 42 states have return successors, (71), 62 states have call predecessors, (71), 62 states have call successors, (71) [2021-11-02 22:35:15,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1586 states to 1586 states and 1869 transitions. [2021-11-02 22:35:15,410 INFO L78 Accepts]: Start accepts. Automaton has 1586 states and 1869 transitions. Word has length 101 [2021-11-02 22:35:15,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:15,411 INFO L470 AbstractCegarLoop]: Abstraction has 1586 states and 1869 transitions. [2021-11-02 22:35:15,411 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.5) internal successors, (91), 24 states have internal predecessors, (91), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:35:15,411 INFO L276 IsEmpty]: Start isEmpty. Operand 1586 states and 1869 transitions. [2021-11-02 22:35:15,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-02 22:35:15,415 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:15,415 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:15,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:15,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:15,642 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting cstrncmpErr7REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:35:15,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:15,642 INFO L85 PathProgramCache]: Analyzing trace with hash 2135056264, now seen corresponding path program 2 times [2021-11-02 22:35:15,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:15,642 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732888645] [2021-11-02 22:35:15,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:15,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:15,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:16,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:16,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:16,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:35:16,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:16,089 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 15 proven. 46 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-02 22:35:16,089 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:16,089 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732888645] [2021-11-02 22:35:16,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732888645] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:16,090 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511089619] [2021-11-02 22:35:16,090 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:35:16,090 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:16,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:16,091 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:16,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-02 22:35:18,585 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:35:18,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:18,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:35:18,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:18,855 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-02 22:35:18,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511089619] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:35:18,855 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:35:18,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [19] total 22 [2021-11-02 22:35:18,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648686349] [2021-11-02 22:35:18,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:35:18,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:18,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:35:18,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-11-02 22:35:18,856 INFO L87 Difference]: Start difference. First operand 1586 states and 1869 transitions. Second operand has 5 states, 4 states have (on average 13.25) internal successors, (53), 5 states have internal predecessors, (53), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:18,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:18,922 INFO L93 Difference]: Finished difference Result 1631 states and 1924 transitions. [2021-11-02 22:35:18,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:35:18,922 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 13.25) internal successors, (53), 5 states have internal predecessors, (53), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 104 [2021-11-02 22:35:18,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:18,928 INFO L225 Difference]: With dead ends: 1631 [2021-11-02 22:35:18,928 INFO L226 Difference]: Without dead ends: 1628 [2021-11-02 22:35:18,929 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:35:18,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1628 states. [2021-11-02 22:35:18,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1628 to 1549. [2021-11-02 22:35:18,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1549 states, 1425 states have (on average 1.1726315789473685) internal successors, (1671), 1438 states have internal predecessors, (1671), 79 states have call successors, (79), 48 states have call predecessors, (79), 42 states have return successors, (71), 62 states have call predecessors, (71), 62 states have call successors, (71) [2021-11-02 22:35:18,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1549 states to 1549 states and 1821 transitions. [2021-11-02 22:35:18,962 INFO L78 Accepts]: Start accepts. Automaton has 1549 states and 1821 transitions. Word has length 104 [2021-11-02 22:35:18,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:18,962 INFO L470 AbstractCegarLoop]: Abstraction has 1549 states and 1821 transitions. [2021-11-02 22:35:18,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 13.25) internal successors, (53), 5 states have internal predecessors, (53), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-02 22:35:18,962 INFO L276 IsEmpty]: Start isEmpty. Operand 1549 states and 1821 transitions. [2021-11-02 22:35:18,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-02 22:35:18,966 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:18,967 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:19,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:19,181 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:19,182 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:35:19,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:19,182 INFO L85 PathProgramCache]: Analyzing trace with hash -1523374077, now seen corresponding path program 5 times [2021-11-02 22:35:19,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:19,182 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865827198] [2021-11-02 22:35:19,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:19,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:19,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:19,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-11-02 22:35:19,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 50 proven. 116 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:35:19,712 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:19,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865827198] [2021-11-02 22:35:19,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865827198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:19,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226074617] [2021-11-02 22:35:19,713 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:35:19,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:19,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:19,718 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:19,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-02 22:35:22,562 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-02 22:35:22,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:22,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-02 22:35:22,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:22,599 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:35:22,599 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 [2021-11-02 22:35:22,601 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 [2021-11-02 22:35:23,724 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 66 proven. 100 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:35:23,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [226074617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:23,724 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:23,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 37 [2021-11-02 22:35:23,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407352308] [2021-11-02 22:35:23,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:35:23,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:23,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:35:23,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1247, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:35:23,726 INFO L87 Difference]: Start difference. First operand 1549 states and 1821 transitions. Second operand has 38 states, 37 states have (on average 4.243243243243243) internal successors, (157), 34 states have internal predecessors, (157), 5 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:33,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:33,576 INFO L93 Difference]: Finished difference Result 1815 states and 2139 transitions. [2021-11-02 22:35:33,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:35:33,576 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 4.243243243243243) internal successors, (157), 34 states have internal predecessors, (157), 5 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 105 [2021-11-02 22:35:33,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:33,582 INFO L225 Difference]: With dead ends: 1815 [2021-11-02 22:35:33,582 INFO L226 Difference]: Without dead ends: 1677 [2021-11-02 22:35:33,583 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 596 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=280, Invalid=2372, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:35:33,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1677 states. [2021-11-02 22:35:33,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1677 to 1490. [2021-11-02 22:35:33,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1490 states, 1381 states have (on average 1.1810282404055032) internal successors, (1631), 1391 states have internal predecessors, (1631), 59 states have call successors, (59), 51 states have call predecessors, (59), 47 states have return successors, (53), 47 states have call predecessors, (53), 47 states have call successors, (53) [2021-11-02 22:35:33,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1490 states to 1490 states and 1743 transitions. [2021-11-02 22:35:33,603 INFO L78 Accepts]: Start accepts. Automaton has 1490 states and 1743 transitions. Word has length 105 [2021-11-02 22:35:33,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:33,603 INFO L470 AbstractCegarLoop]: Abstraction has 1490 states and 1743 transitions. [2021-11-02 22:35:33,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 4.243243243243243) internal successors, (157), 34 states have internal predecessors, (157), 5 states have call successors, (8), 6 states have call predecessors, (8), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:33,603 INFO L276 IsEmpty]: Start isEmpty. Operand 1490 states and 1743 transitions. [2021-11-02 22:35:33,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-02 22:35:33,605 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:33,605 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:33,635 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:33,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:33,810 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:35:33,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:33,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1547294454, now seen corresponding path program 14 times [2021-11-02 22:35:33,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:33,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986562047] [2021-11-02 22:35:33,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:33,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:33,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:34,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,260 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-11-02 22:35:34,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:34,264 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 72 proven. 167 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:35:34,265 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:34,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986562047] [2021-11-02 22:35:34,265 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986562047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:34,265 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051071553] [2021-11-02 22:35:34,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:35:34,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:34,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:34,267 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:34,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-02 22:35:36,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:35:36,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:36,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-02 22:35:36,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:37,380 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 91 proven. 148 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:35:37,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051071553] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:37,380 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:37,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2021-11-02 22:35:37,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067840524] [2021-11-02 22:35:37,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-02 22:35:37,381 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:37,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-02 22:35:37,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1102, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:35:37,382 INFO L87 Difference]: Start difference. First operand 1490 states and 1743 transitions. Second operand has 36 states, 35 states have (on average 4.171428571428572) internal successors, (146), 33 states have internal predecessors, (146), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:39,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:39,323 INFO L93 Difference]: Finished difference Result 1535 states and 1796 transitions. [2021-11-02 22:35:39,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-02 22:35:39,324 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 4.171428571428572) internal successors, (146), 33 states have internal predecessors, (146), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 105 [2021-11-02 22:35:39,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:39,328 INFO L225 Difference]: With dead ends: 1535 [2021-11-02 22:35:39,328 INFO L226 Difference]: Without dead ends: 1535 [2021-11-02 22:35:39,329 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=276, Invalid=2076, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:35:39,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1535 states. [2021-11-02 22:35:39,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1535 to 1526. [2021-11-02 22:35:39,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1526 states, 1413 states have (on average 1.1797593772116066) internal successors, (1667), 1423 states have internal predecessors, (1667), 63 states have call successors, (63), 51 states have call predecessors, (63), 47 states have return successors, (57), 51 states have call predecessors, (57), 51 states have call successors, (57) [2021-11-02 22:35:39,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1526 states to 1526 states and 1787 transitions. [2021-11-02 22:35:39,349 INFO L78 Accepts]: Start accepts. Automaton has 1526 states and 1787 transitions. Word has length 105 [2021-11-02 22:35:39,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:39,349 INFO L470 AbstractCegarLoop]: Abstraction has 1526 states and 1787 transitions. [2021-11-02 22:35:39,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 4.171428571428572) internal successors, (146), 33 states have internal predecessors, (146), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:35:39,350 INFO L276 IsEmpty]: Start isEmpty. Operand 1526 states and 1787 transitions. [2021-11-02 22:35:39,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-02 22:35:39,352 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:39,353 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:39,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:39,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:39,566 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting cstrncmpErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:35:39,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:39,566 INFO L85 PathProgramCache]: Analyzing trace with hash -358177687, now seen corresponding path program 3 times [2021-11-02 22:35:39,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:39,566 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349939503] [2021-11-02 22:35:39,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:39,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:39,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:40,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:40,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:40,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:35:40,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:40,052 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 15 proven. 63 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-02 22:35:40,052 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:40,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349939503] [2021-11-02 22:35:40,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349939503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:40,053 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070281037] [2021-11-02 22:35:40,053 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:35:40,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:40,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:40,054 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:40,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-02 22:35:42,708 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:35:42,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:42,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-02 22:35:42,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:43,187 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 9 proven. 39 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-02 22:35:43,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070281037] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:43,187 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:43,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14] total 32 [2021-11-02 22:35:43,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443527144] [2021-11-02 22:35:43,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 22:35:43,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:43,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 22:35:43,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=917, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:35:43,189 INFO L87 Difference]: Start difference. First operand 1526 states and 1787 transitions. Second operand has 32 states, 31 states have (on average 4.870967741935484) internal successors, (151), 27 states have internal predecessors, (151), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:45,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:45,997 INFO L93 Difference]: Finished difference Result 3491 states and 4066 transitions. [2021-11-02 22:35:45,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-02 22:35:45,998 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 4.870967741935484) internal successors, (151), 27 states have internal predecessors, (151), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 108 [2021-11-02 22:35:45,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:46,005 INFO L225 Difference]: With dead ends: 3491 [2021-11-02 22:35:46,005 INFO L226 Difference]: Without dead ends: 3051 [2021-11-02 22:35:46,005 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=261, Invalid=3045, Unknown=0, NotChecked=0, Total=3306 [2021-11-02 22:35:46,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3051 states. [2021-11-02 22:35:46,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3051 to 1952. [2021-11-02 22:35:46,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1952 states, 1823 states have (on average 1.1958310477235325) internal successors, (2180), 1833 states have internal predecessors, (2180), 71 states have call successors, (71), 58 states have call predecessors, (71), 55 states have return successors, (66), 60 states have call predecessors, (66), 59 states have call successors, (66) [2021-11-02 22:35:46,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1952 states to 1952 states and 2317 transitions. [2021-11-02 22:35:46,053 INFO L78 Accepts]: Start accepts. Automaton has 1952 states and 2317 transitions. Word has length 108 [2021-11-02 22:35:46,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:46,053 INFO L470 AbstractCegarLoop]: Abstraction has 1952 states and 2317 transitions. [2021-11-02 22:35:46,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 4.870967741935484) internal successors, (151), 27 states have internal predecessors, (151), 4 states have call successors, (9), 5 states have call predecessors, (9), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-02 22:35:46,053 INFO L276 IsEmpty]: Start isEmpty. Operand 1952 states and 2317 transitions. [2021-11-02 22:35:46,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-02 22:35:46,057 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:46,057 INFO L513 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 8, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:46,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:46,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:46,279 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:35:46,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:46,280 INFO L85 PathProgramCache]: Analyzing trace with hash 777449903, now seen corresponding path program 15 times [2021-11-02 22:35:46,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:46,280 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286614116] [2021-11-02 22:35:46,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:46,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:46,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:47,230 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:47,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:47,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-11-02 22:35:47,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:47,238 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 23 proven. 253 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:35:47,238 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:47,239 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286614116] [2021-11-02 22:35:47,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286614116] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:47,239 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804024201] [2021-11-02 22:35:47,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:35:47,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:47,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:47,243 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:47,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-02 22:35:49,833 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-02 22:35:49,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:49,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-02 22:35:49,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:49,874 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:35:49,874 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 [2021-11-02 22:35:50,890 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 [2021-11-02 22:35:50,984 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-02 22:35:50,984 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 [2021-11-02 22:36:02,910 INFO L354 Elim1Store]: treesize reduction 50, result has 5.7 percent of original size [2021-11-02 22:36:02,911 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 53 treesize of output 34 [2021-11-02 22:36:03,105 INFO L134 CoverageAnalysis]: Checked inductivity of 282 backedges. 23 proven. 259 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:03,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804024201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:03,105 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:03,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 36] total 62 [2021-11-02 22:36:03,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945388786] [2021-11-02 22:36:03,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-02 22:36:03,106 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:03,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-02 22:36:03,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=3622, Unknown=0, NotChecked=0, Total=3782 [2021-11-02 22:36:03,106 INFO L87 Difference]: Start difference. First operand 1952 states and 2317 transitions. Second operand has 62 states, 61 states have (on average 3.2295081967213113) internal successors, (197), 58 states have internal predecessors, (197), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:26,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:26,279 INFO L93 Difference]: Finished difference Result 2458 states and 2909 transitions. [2021-11-02 22:36:26,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-02 22:36:26,280 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 3.2295081967213113) internal successors, (197), 58 states have internal predecessors, (197), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 110 [2021-11-02 22:36:26,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:26,284 INFO L225 Difference]: With dead ends: 2458 [2021-11-02 22:36:26,284 INFO L226 Difference]: Without dead ends: 2253 [2021-11-02 22:36:26,285 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3166 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=658, Invalid=13862, Unknown=0, NotChecked=0, Total=14520 [2021-11-02 22:36:26,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2253 states. [2021-11-02 22:36:26,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2253 to 2250. [2021-11-02 22:36:26,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2250 states, 2087 states have (on average 1.184475323430762) internal successors, (2472), 2100 states have internal predecessors, (2472), 105 states have call successors, (105), 61 states have call predecessors, (105), 55 states have return successors, (97), 88 states have call predecessors, (97), 86 states have call successors, (97) [2021-11-02 22:36:26,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2250 states to 2250 states and 2674 transitions. [2021-11-02 22:36:26,322 INFO L78 Accepts]: Start accepts. Automaton has 2250 states and 2674 transitions. Word has length 110 [2021-11-02 22:36:26,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:26,322 INFO L470 AbstractCegarLoop]: Abstraction has 2250 states and 2674 transitions. [2021-11-02 22:36:26,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 61 states have (on average 3.2295081967213113) internal successors, (197), 58 states have internal predecessors, (197), 5 states have call successors, (7), 5 states have call predecessors, (7), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:26,323 INFO L276 IsEmpty]: Start isEmpty. Operand 2250 states and 2674 transitions. [2021-11-02 22:36:26,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-02 22:36:26,327 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:26,327 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:26,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:26,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:26,527 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting cstrncmpErr1REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:36:26,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:26,528 INFO L85 PathProgramCache]: Analyzing trace with hash 474913497, now seen corresponding path program 6 times [2021-11-02 22:36:26,528 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:26,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653930159] [2021-11-02 22:36:26,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:26,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:26,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:27,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:27,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:27,060 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:36:27,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:27,064 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 72 proven. 153 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:36:27,064 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:27,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653930159] [2021-11-02 22:36:27,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1653930159] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:27,065 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421807026] [2021-11-02 22:36:27,065 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:36:27,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:27,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:27,070 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:27,085 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-02 22:36:30,221 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-02 22:36:30,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:30,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-02 22:36:30,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:31,083 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 98 proven. 127 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-02 22:36:31,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421807026] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:31,083 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:31,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 44 [2021-11-02 22:36:31,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234774613] [2021-11-02 22:36:31,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-02 22:36:31,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:31,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-02 22:36:31,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1740, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:36:31,085 INFO L87 Difference]: Start difference. First operand 2250 states and 2674 transitions. Second operand has 45 states, 44 states have (on average 4.204545454545454) internal successors, (185), 40 states have internal predecessors, (185), 7 states have call successors, (9), 6 states have call predecessors, (9), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:33,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:33,440 INFO L93 Difference]: Finished difference Result 2779 states and 3327 transitions. [2021-11-02 22:36:33,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-02 22:36:33,441 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 4.204545454545454) internal successors, (185), 40 states have internal predecessors, (185), 7 states have call successors, (9), 6 states have call predecessors, (9), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 114 [2021-11-02 22:36:33,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:33,445 INFO L225 Difference]: With dead ends: 2779 [2021-11-02 22:36:33,445 INFO L226 Difference]: Without dead ends: 2570 [2021-11-02 22:36:33,445 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=473, Invalid=3817, Unknown=0, NotChecked=0, Total=4290 [2021-11-02 22:36:33,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2570 states. [2021-11-02 22:36:33,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2570 to 2172. [2021-11-02 22:36:33,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2172 states, 2033 states have (on average 1.1987211018199704) internal successors, (2437), 2043 states have internal predecessors, (2437), 75 states have call successors, (75), 65 states have call predecessors, (75), 61 states have return successors, (69), 63 states have call predecessors, (69), 62 states have call successors, (69) [2021-11-02 22:36:33,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2172 states to 2172 states and 2581 transitions. [2021-11-02 22:36:33,491 INFO L78 Accepts]: Start accepts. Automaton has 2172 states and 2581 transitions. Word has length 114 [2021-11-02 22:36:33,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:33,491 INFO L470 AbstractCegarLoop]: Abstraction has 2172 states and 2581 transitions. [2021-11-02 22:36:33,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 4.204545454545454) internal successors, (185), 40 states have internal predecessors, (185), 7 states have call successors, (9), 6 states have call predecessors, (9), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:33,491 INFO L276 IsEmpty]: Start isEmpty. Operand 2172 states and 2581 transitions. [2021-11-02 22:36:33,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-02 22:36:33,495 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:33,495 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:33,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:33,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:33,722 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:36:33,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:33,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1804216948, now seen corresponding path program 16 times [2021-11-02 22:36:33,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:33,722 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442914608] [2021-11-02 22:36:33,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:33,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:33,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:34,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:36:34,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:34,257 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 98 proven. 211 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:36:34,258 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:34,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442914608] [2021-11-02 22:36:34,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442914608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:34,258 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067284558] [2021-11-02 22:36:34,258 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:36:34,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:34,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:34,259 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:34,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-02 22:36:37,054 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:36:37,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:37,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-02 22:36:37,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:37,775 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 128 proven. 181 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:36:37,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067284558] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:37,776 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:37,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 37 [2021-11-02 22:36:37,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875848783] [2021-11-02 22:36:37,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:36:37,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:37,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:36:37,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1220, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:36:37,778 INFO L87 Difference]: Start difference. First operand 2172 states and 2581 transitions. Second operand has 38 states, 37 states have (on average 4.297297297297297) internal successors, (159), 35 states have internal predecessors, (159), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:39,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:39,983 INFO L93 Difference]: Finished difference Result 2228 states and 2647 transitions. [2021-11-02 22:36:39,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:36:39,986 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 4.297297297297297) internal successors, (159), 35 states have internal predecessors, (159), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 114 [2021-11-02 22:36:39,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:39,991 INFO L225 Difference]: With dead ends: 2228 [2021-11-02 22:36:39,991 INFO L226 Difference]: Without dead ends: 2228 [2021-11-02 22:36:39,991 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=293, Invalid=2257, Unknown=0, NotChecked=0, Total=2550 [2021-11-02 22:36:39,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2228 states. [2021-11-02 22:36:40,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2228 to 2217. [2021-11-02 22:36:40,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2217 states, 2073 states have (on average 1.1972986010612638) internal successors, (2482), 2083 states have internal predecessors, (2482), 80 states have call successors, (80), 65 states have call predecessors, (80), 61 states have return successors, (74), 68 states have call predecessors, (74), 67 states have call successors, (74) [2021-11-02 22:36:40,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2217 states to 2217 states and 2636 transitions. [2021-11-02 22:36:40,029 INFO L78 Accepts]: Start accepts. Automaton has 2217 states and 2636 transitions. Word has length 114 [2021-11-02 22:36:40,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:40,030 INFO L470 AbstractCegarLoop]: Abstraction has 2217 states and 2636 transitions. [2021-11-02 22:36:40,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 4.297297297297297) internal successors, (159), 35 states have internal predecessors, (159), 5 states have call successors, (7), 4 states have call predecessors, (7), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:40,030 INFO L276 IsEmpty]: Start isEmpty. Operand 2217 states and 2636 transitions. [2021-11-02 22:36:40,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-02 22:36:40,034 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:40,034 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:40,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:40,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-02 22:36:40,262 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting cstrncmpErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:36:40,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:40,262 INFO L85 PathProgramCache]: Analyzing trace with hash 309014093, now seen corresponding path program 4 times [2021-11-02 22:36:40,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:40,262 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456937897] [2021-11-02 22:36:40,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:40,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:40,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:40,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:40,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:40,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-11-02 22:36:40,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:40,650 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 5 proven. 66 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-11-02 22:36:40,650 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:40,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456937897] [2021-11-02 22:36:40,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456937897] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:40,650 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764070768] [2021-11-02 22:36:40,650 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:36:40,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:40,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:40,658 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:40,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-02 22:36:43,399 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:36:43,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:43,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-02 22:36:43,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:43,433 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:43,433 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 [2021-11-02 22:36:44,269 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 22 proven. 49 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-11-02 22:36:44,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764070768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:44,270 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:44,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 39 [2021-11-02 22:36:44,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564454996] [2021-11-02 22:36:44,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:36:44,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:44,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:36:44,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1292, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:36:44,272 INFO L87 Difference]: Start difference. First operand 2217 states and 2636 transitions. Second operand has 39 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 35 states have internal predecessors, (126), 6 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:51,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:51,821 INFO L93 Difference]: Finished difference Result 3381 states and 3975 transitions. [2021-11-02 22:36:51,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:36:51,822 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 35 states have internal predecessors, (126), 6 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 119 [2021-11-02 22:36:51,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:51,827 INFO L225 Difference]: With dead ends: 3381 [2021-11-02 22:36:51,827 INFO L226 Difference]: Without dead ends: 3273 [2021-11-02 22:36:51,828 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=419, Invalid=3003, Unknown=0, NotChecked=0, Total=3422 [2021-11-02 22:36:51,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3273 states. [2021-11-02 22:36:51,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3273 to 2273. [2021-11-02 22:36:51,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2273 states, 2123 states have (on average 1.1945360339142723) internal successors, (2536), 2137 states have internal predecessors, (2536), 82 states have call successors, (82), 67 states have call predecessors, (82), 65 states have return successors, (78), 68 states have call predecessors, (78), 68 states have call successors, (78) [2021-11-02 22:36:51,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2273 states to 2273 states and 2696 transitions. [2021-11-02 22:36:51,872 INFO L78 Accepts]: Start accepts. Automaton has 2273 states and 2696 transitions. Word has length 119 [2021-11-02 22:36:51,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:51,872 INFO L470 AbstractCegarLoop]: Abstraction has 2273 states and 2696 transitions. [2021-11-02 22:36:51,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 35 states have internal predecessors, (126), 6 states have call successors, (8), 6 states have call predecessors, (8), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:36:51,872 INFO L276 IsEmpty]: Start isEmpty. Operand 2273 states and 2696 transitions. [2021-11-02 22:36:51,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-02 22:36:51,877 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:51,878 INFO L513 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:51,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:52,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-02 22:36:52,094 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting cstrstrErr3REQUIRES_VIOLATION === [cstrstrErr0REQUIRES_VIOLATION, cstrstrErr1REQUIRES_VIOLATION, cstrstrErr2REQUIRES_VIOLATION, cstrstrErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-02 22:36:52,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:52,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1373675737, now seen corresponding path program 17 times [2021-11-02 22:36:52,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:52,094 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471153167] [2021-11-02 22:36:52,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:52,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:52,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:53,088 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:53,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:53,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-11-02 22:36:53,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:53,096 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 26 proven. 325 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:36:53,097 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:53,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471153167] [2021-11-02 22:36:53,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471153167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:53,097 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698760513] [2021-11-02 22:36:53,098 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:36:53,098 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:53,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:53,102 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:53,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e7b6b299-547f-47af-a666-032e211296b4/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-02 22:36:56,068 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-02 22:36:56,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:56,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-02 22:36:56,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:56,107 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:56,108 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 [2021-11-02 22:36:57,104 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:36:57,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 25 [2021-11-02 22:36:57,969 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 [2021-11-02 22:36:58,073 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:36:58,073 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