./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version b2eff8ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg --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 10a3b461143c2c5d394f7bd34cd6fefed4195b79a5252178f7ede404a303cf96 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.1-dev-b2eff8b [2021-10-28 09:16:58,977 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-28 09:16:58,979 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-28 09:16:59,011 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-28 09:16:59,012 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-28 09:16:59,013 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-28 09:16:59,015 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-28 09:16:59,017 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-28 09:16:59,019 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-28 09:16:59,020 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-28 09:16:59,021 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-28 09:16:59,023 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-28 09:16:59,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-28 09:16:59,025 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-28 09:16:59,026 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-28 09:16:59,028 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-28 09:16:59,029 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-28 09:16:59,030 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-28 09:16:59,032 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-28 09:16:59,034 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-28 09:16:59,036 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-28 09:16:59,037 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-28 09:16:59,039 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-28 09:16:59,040 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-28 09:16:59,043 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-28 09:16:59,044 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-28 09:16:59,044 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-28 09:16:59,045 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-28 09:16:59,046 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-28 09:16:59,047 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-28 09:16:59,047 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-28 09:16:59,048 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-28 09:16:59,049 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-28 09:16:59,050 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-28 09:16:59,051 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-28 09:16:59,051 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-28 09:16:59,052 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-28 09:16:59,053 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-28 09:16:59,053 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-28 09:16:59,054 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-28 09:16:59,055 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-28 09:16:59,056 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-10-28 09:16:59,080 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-28 09:16:59,081 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-28 09:16:59,081 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-10-28 09:16:59,081 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-10-28 09:16:59,082 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-28 09:16:59,083 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-28 09:16:59,083 INFO L138 SettingsManager]: * Use SBE=true [2021-10-28 09:16:59,083 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-28 09:16:59,083 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-28 09:16:59,083 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-28 09:16:59,084 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-28 09:16:59,084 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-28 09:16:59,084 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-28 09:16:59,084 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-28 09:16:59,084 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-28 09:16:59,084 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-28 09:16:59,085 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-28 09:16:59,085 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-28 09:16:59,085 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-28 09:16:59,085 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-28 09:16:59,085 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-28 09:16:59,086 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-28 09:16:59,086 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-28 09:16:59,086 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 09:16:59,086 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-28 09:16:59,086 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-28 09:16:59,087 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-28 09:16:59,087 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-28 09:16:59,087 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-28 09:16:59,087 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_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 10a3b461143c2c5d394f7bd34cd6fefed4195b79a5252178f7ede404a303cf96 [2021-10-28 09:16:59,352 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-28 09:16:59,378 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-28 09:16:59,382 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-28 09:16:59,383 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-28 09:16:59,385 INFO L275 PluginConnector]: CDTParser initialized [2021-10-28 09:16:59,386 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/../../sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i [2021-10-28 09:16:59,468 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/data/2afea7dc3/d5abc5d92bc840fab3ff304f0a898928/FLAG22337f70d [2021-10-28 09:16:59,973 INFO L306 CDTParser]: Found 1 translation units. [2021-10-28 09:16:59,979 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/sv-benchmarks/c/array-memsafety/cstrchr_unsafe.i [2021-10-28 09:16:59,991 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/data/2afea7dc3/d5abc5d92bc840fab3ff304f0a898928/FLAG22337f70d [2021-10-28 09:17:00,285 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/data/2afea7dc3/d5abc5d92bc840fab3ff304f0a898928 [2021-10-28 09:17:00,288 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-28 09:17:00,289 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-10-28 09:17:00,291 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-28 09:17:00,291 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-28 09:17:00,307 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-28 09:17:00,308 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c2d1c56 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00, skipping insertion in model container [2021-10-28 09:17:00,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,319 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-28 09:17:00,357 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-28 09:17:00,659 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 09:17:00,667 INFO L203 MainTranslator]: Completed pre-run [2021-10-28 09:17:00,714 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-28 09:17:00,752 INFO L208 MainTranslator]: Completed translation [2021-10-28 09:17:00,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00 WrapperNode [2021-10-28 09:17:00,753 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-28 09:17:00,754 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-28 09:17:00,754 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-28 09:17:00,754 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-28 09:17:00,766 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,768 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,795 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,795 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,819 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,823 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,827 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,833 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-28 09:17:00,834 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-28 09:17:00,834 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-28 09:17:00,834 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-28 09:17:00,837 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (1/1) ... [2021-10-28 09:17:00,853 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-28 09:17:00,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:17:00,883 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-28 09:17:00,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-28 09:17:00,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-10-28 09:17:00,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-28 09:17:00,936 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-10-28 09:17:00,937 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-10-28 09:17:00,937 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-10-28 09:17:00,937 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-10-28 09:17:00,938 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-10-28 09:17:00,938 INFO L138 BoogieDeclarations]: Found implementation of procedure build_nondet_String [2021-10-28 09:17:00,939 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrchr [2021-10-28 09:17:00,939 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-10-28 09:17:00,939 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-10-28 09:17:00,940 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-10-28 09:17:00,940 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-10-28 09:17:00,940 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-10-28 09:17:00,940 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-10-28 09:17:00,940 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-10-28 09:17:00,940 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-10-28 09:17:00,941 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-10-28 09:17:00,941 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-10-28 09:17:00,941 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-10-28 09:17:00,941 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-10-28 09:17:00,941 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-10-28 09:17:00,941 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-10-28 09:17:00,942 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-10-28 09:17:00,942 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-10-28 09:17:00,942 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-10-28 09:17:00,942 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-10-28 09:17:00,942 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-10-28 09:17:00,942 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-10-28 09:17:00,943 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-10-28 09:17:00,943 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-10-28 09:17:00,943 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-10-28 09:17:00,943 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-10-28 09:17:00,943 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-10-28 09:17:00,944 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-10-28 09:17:00,945 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-10-28 09:17:00,945 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-10-28 09:17:00,945 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-10-28 09:17:00,945 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-10-28 09:17:00,945 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-10-28 09:17:00,945 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-10-28 09:17:00,946 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-10-28 09:17:00,946 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-10-28 09:17:00,946 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-10-28 09:17:00,946 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-10-28 09:17:00,947 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-10-28 09:17:00,947 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-10-28 09:17:00,948 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-10-28 09:17:00,948 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-10-28 09:17:00,948 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-10-28 09:17:00,948 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-10-28 09:17:00,948 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-10-28 09:17:00,949 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-10-28 09:17:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-10-28 09:17:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-10-28 09:17:00,950 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-10-28 09:17:00,951 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-10-28 09:17:00,951 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-10-28 09:17:00,952 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-10-28 09:17:00,952 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-10-28 09:17:00,953 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-10-28 09:17:00,954 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-10-28 09:17:00,954 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-10-28 09:17:00,954 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-10-28 09:17:00,955 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-10-28 09:17:00,955 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-10-28 09:17:00,955 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-10-28 09:17:00,955 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-10-28 09:17:00,955 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-10-28 09:17:00,955 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-10-28 09:17:00,956 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-10-28 09:17:00,957 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-10-28 09:17:00,957 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-10-28 09:17:00,957 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-10-28 09:17:00,957 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-10-28 09:17:00,957 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-10-28 09:17:00,957 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-10-28 09:17:00,958 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-10-28 09:17:00,958 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-10-28 09:17:00,958 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-10-28 09:17:00,958 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-10-28 09:17:00,958 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-10-28 09:17:00,958 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-10-28 09:17:00,959 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-10-28 09:17:00,959 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-10-28 09:17:00,959 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-10-28 09:17:00,959 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-10-28 09:17:00,959 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-10-28 09:17:00,960 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-10-28 09:17:00,960 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-10-28 09:17:00,960 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure build_nondet_String [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-28 09:17:00,961 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-28 09:17:00,962 INFO L130 BoogieDeclarations]: Found specification of procedure cstrchr [2021-10-28 09:17:00,962 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-28 09:17:00,962 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-10-28 09:17:00,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-28 09:17:00,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-10-28 09:17:00,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-28 09:17:01,542 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-28 09:17:01,542 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-10-28 09:17:01,544 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 09:17:01 BoogieIcfgContainer [2021-10-28 09:17:01,544 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-28 09:17:01,546 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-28 09:17:01,547 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-28 09:17:01,551 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-28 09:17:01,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 09:17:00" (1/3) ... [2021-10-28 09:17:01,552 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55b7a702 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 09:17:01, skipping insertion in model container [2021-10-28 09:17:01,552 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 09:17:00" (2/3) ... [2021-10-28 09:17:01,552 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55b7a702 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 09:17:01, skipping insertion in model container [2021-10-28 09:17:01,552 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 09:17:01" (3/3) ... [2021-10-28 09:17:01,554 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrchr_unsafe.i [2021-10-28 09:17:01,560 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-28 09:17:01,560 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 16 error locations. [2021-10-28 09:17:01,613 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-28 09:17:01,626 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 [2021-10-28 09:17:01,626 INFO L340 AbstractCegarLoop]: Starting to check reachability of 16 error locations. [2021-10-28 09:17:01,643 INFO L276 IsEmpty]: Start isEmpty. Operand has 56 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-10-28 09:17:01,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 09:17:01,651 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:01,652 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:01,652 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting build_nondet_StringErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:01,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:01,658 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183926, now seen corresponding path program 1 times [2021-10-28 09:17:01,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:01,668 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681199144] [2021-10-28 09:17:01,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:01,669 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:01,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:01,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:01,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:01,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:01,836 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:01,837 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681199144] [2021-10-28 09:17:01,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681199144] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:01,838 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:01,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-28 09:17:01,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851638920] [2021-10-28 09:17:01,845 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-28 09:17:01,845 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:01,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-28 09:17:01,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-28 09:17:01,862 INFO L87 Difference]: Start difference. First operand has 56 states, 31 states have (on average 1.7419354838709677) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:01,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:01,951 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2021-10-28 09:17:01,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-28 09:17:01,953 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 09:17:01,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:01,961 INFO L225 Difference]: With dead ends: 56 [2021-10-28 09:17:01,962 INFO L226 Difference]: Without dead ends: 53 [2021-10-28 09:17:01,963 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-28 09:17:01,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-28 09:17:02,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-10-28 09:17:02,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 30 states have (on average 1.6666666666666667) internal successors, (50), 45 states have internal predecessors, (50), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:02,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2021-10-28 09:17:02,024 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 11 [2021-10-28 09:17:02,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:02,039 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2021-10-28 09:17:02,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,039 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2021-10-28 09:17:02,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 09:17:02,040 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:02,041 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:02,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-28 09:17:02,041 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting build_nondet_StringErr2REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:02,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:02,044 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183616, now seen corresponding path program 1 times [2021-10-28 09:17:02,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:02,045 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726731487] [2021-10-28 09:17:02,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:02,045 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:02,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,133 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:02,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:02,142 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:02,142 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726731487] [2021-10-28 09:17:02,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726731487] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:02,143 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:02,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-28 09:17:02,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498821190] [2021-10-28 09:17:02,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-28 09:17:02,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:02,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-28 09:17:02,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-28 09:17:02,146 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:02,252 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-10-28 09:17:02,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 09:17:02,253 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 09:17:02,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:02,254 INFO L225 Difference]: With dead ends: 51 [2021-10-28 09:17:02,254 INFO L226 Difference]: Without dead ends: 51 [2021-10-28 09:17:02,255 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 [2021-10-28 09:17:02,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-10-28 09:17:02,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-10-28 09:17:02,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 30 states have (on average 1.6) internal successors, (48), 43 states have internal predecessors, (48), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:02,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-10-28 09:17:02,263 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 11 [2021-10-28 09:17:02,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:02,264 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-10-28 09:17:02,264 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,264 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-10-28 09:17:02,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 09:17:02,265 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:02,265 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:02,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-28 09:17:02,266 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting build_nondet_StringErr3REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:02,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:02,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183617, now seen corresponding path program 1 times [2021-10-28 09:17:02,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:02,268 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330365091] [2021-10-28 09:17:02,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:02,268 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:02,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:02,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:02,400 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:02,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330365091] [2021-10-28 09:17:02,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330365091] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:02,403 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:02,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 09:17:02,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785253738] [2021-10-28 09:17:02,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 09:17:02,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:02,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 09:17:02,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-28 09:17:02,407 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:02,555 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-10-28 09:17:02,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 09:17:02,555 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 09:17:02,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:02,562 INFO L225 Difference]: With dead ends: 50 [2021-10-28 09:17:02,562 INFO L226 Difference]: Without dead ends: 50 [2021-10-28 09:17:02,563 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-28 09:17:02,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-10-28 09:17:02,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-10-28 09:17:02,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 30 states have (on average 1.5666666666666667) internal successors, (47), 42 states have internal predecessors, (47), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:02,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2021-10-28 09:17:02,570 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 11 [2021-10-28 09:17:02,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:02,570 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2021-10-28 09:17:02,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,571 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2021-10-28 09:17:02,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 09:17:02,571 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:02,572 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:02,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-28 09:17:02,572 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting build_nondet_StringErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:02,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:02,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1524183670, now seen corresponding path program 1 times [2021-10-28 09:17:02,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:02,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894332606] [2021-10-28 09:17:02,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:02,582 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:02,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:02,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:02,687 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:02,688 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894332606] [2021-10-28 09:17:02,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894332606] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:02,688 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:02,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-28 09:17:02,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753313608] [2021-10-28 09:17:02,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 09:17:02,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:02,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 09:17:02,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-28 09:17:02,691 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:02,798 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2021-10-28 09:17:02,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 09:17:02,799 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 09:17:02,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:02,803 INFO L225 Difference]: With dead ends: 56 [2021-10-28 09:17:02,803 INFO L226 Difference]: Without dead ends: 56 [2021-10-28 09:17:02,804 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-10-28 09:17:02,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-10-28 09:17:02,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2021-10-28 09:17:02,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 32 states have (on average 1.53125) internal successors, (49), 44 states have internal predecessors, (49), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:02,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-10-28 09:17:02,834 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 11 [2021-10-28 09:17:02,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:02,835 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-10-28 09:17:02,835 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:02,836 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-10-28 09:17:02,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-28 09:17:02,836 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:02,837 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:02,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-28 09:17:02,837 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting build_nondet_StringErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:02,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:02,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1524243252, now seen corresponding path program 1 times [2021-10-28 09:17:02,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:02,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649958885] [2021-10-28 09:17:02,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:02,840 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:02,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:02,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:02,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:02,952 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:02,953 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649958885] [2021-10-28 09:17:02,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649958885] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:02,953 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:02,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-28 09:17:02,954 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709457956] [2021-10-28 09:17:02,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 09:17:02,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:02,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 09:17:02,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-28 09:17:02,956 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:03,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:03,112 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-10-28 09:17:03,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-28 09:17:03,113 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-10-28 09:17:03,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:03,119 INFO L225 Difference]: With dead ends: 60 [2021-10-28 09:17:03,120 INFO L226 Difference]: Without dead ends: 60 [2021-10-28 09:17:03,120 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-28 09:17:03,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-10-28 09:17:03,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-10-28 09:17:03,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 46 states have internal predecessors, (52), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:03,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2021-10-28 09:17:03,137 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 11 [2021-10-28 09:17:03,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:03,137 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2021-10-28 09:17:03,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:03,138 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2021-10-28 09:17:03,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-28 09:17:03,139 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:03,139 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:03,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-28 09:17:03,140 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting build_nondet_StringErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:03,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:03,140 INFO L85 PathProgramCache]: Analyzing trace with hash -583933833, now seen corresponding path program 1 times [2021-10-28 09:17:03,141 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:03,141 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357098876] [2021-10-28 09:17:03,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:03,141 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:03,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:03,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:03,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:03,287 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:03,287 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:03,287 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357098876] [2021-10-28 09:17:03,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357098876] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:17:03,288 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106115939] [2021-10-28 09:17:03,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:03,288 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-28 09:17:03,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 [2021-10-28 09:17:03,290 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-28 09:17:03,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-28 09:17:03,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:03,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-28 09:17:03,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-28 09:17:03,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-28 09:17:03,701 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:03,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106115939] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-28 09:17:03,702 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-10-28 09:17:03,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-10-28 09:17:03,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338534462] [2021-10-28 09:17:03,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-28 09:17:03,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:03,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-28 09:17:03,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-10-28 09:17:03,704 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:03,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:03,889 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2021-10-28 09:17:03,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-28 09:17:03,889 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-10-28 09:17:03,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:03,891 INFO L225 Difference]: With dead ends: 59 [2021-10-28 09:17:03,891 INFO L226 Difference]: Without dead ends: 59 [2021-10-28 09:17:03,891 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 [2021-10-28 09:17:03,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-10-28 09:17:03,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2021-10-28 09:17:03,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 32 states have (on average 1.5) internal successors, (48), 43 states have internal predecessors, (48), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:03,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-10-28 09:17:03,896 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 15 [2021-10-28 09:17:03,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:03,897 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-10-28 09:17:03,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-10-28 09:17:03,897 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-10-28 09:17:03,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-28 09:17:03,898 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:03,898 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:03,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-28 09:17:04,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-10-28 09:17:04,111 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting cstrchrErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:04,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:04,112 INFO L85 PathProgramCache]: Analyzing trace with hash -269979680, now seen corresponding path program 1 times [2021-10-28 09:17:04,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:04,112 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884876716] [2021-10-28 09:17:04,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:04,113 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:04,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:04,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:04,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:04,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:04,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:04,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:04,259 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:04,259 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884876716] [2021-10-28 09:17:04,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884876716] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:04,259 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:04,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-10-28 09:17:04,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815779413] [2021-10-28 09:17:04,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-28 09:17:04,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:04,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-28 09:17:04,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-10-28 09:17:04,262 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 10 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:04,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:04,487 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2021-10-28 09:17:04,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-28 09:17:04,488 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-10-28 09:17:04,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:04,490 INFO L225 Difference]: With dead ends: 47 [2021-10-28 09:17:04,490 INFO L226 Difference]: Without dead ends: 47 [2021-10-28 09:17:04,490 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-10-28 09:17:04,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-10-28 09:17:04,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-10-28 09:17:04,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.375) internal successors, (44), 39 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:04,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2021-10-28 09:17:04,497 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 18 [2021-10-28 09:17:04,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:04,498 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2021-10-28 09:17:04,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:04,498 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2021-10-28 09:17:04,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-28 09:17:04,499 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:04,499 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:04,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-10-28 09:17:04,500 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:04,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:04,502 INFO L85 PathProgramCache]: Analyzing trace with hash -269979679, now seen corresponding path program 1 times [2021-10-28 09:17:04,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:04,502 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034539089] [2021-10-28 09:17:04,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:04,503 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:04,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:04,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:04,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:04,654 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:04,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:04,769 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:04,770 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:04,770 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034539089] [2021-10-28 09:17:04,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034539089] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:04,770 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:04,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 09:17:04,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061937090] [2021-10-28 09:17:04,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-28 09:17:04,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:04,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-28 09:17:04,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-10-28 09:17:04,774 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:05,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:05,088 INFO L93 Difference]: Finished difference Result 57 states and 64 transitions. [2021-10-28 09:17:05,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-28 09:17:05,088 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-10-28 09:17:05,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:05,089 INFO L225 Difference]: With dead ends: 57 [2021-10-28 09:17:05,089 INFO L226 Difference]: Without dead ends: 57 [2021-10-28 09:17:05,090 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-10-28 09:17:05,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-10-28 09:17:05,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 53. [2021-10-28 09:17:05,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 45 states have internal predecessors, (52), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:05,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2021-10-28 09:17:05,094 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 18 [2021-10-28 09:17:05,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:05,094 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2021-10-28 09:17:05,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.2) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:05,094 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2021-10-28 09:17:05,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-28 09:17:05,095 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:05,095 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:05,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-10-28 09:17:05,096 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:05,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:05,096 INFO L85 PathProgramCache]: Analyzing trace with hash -463192456, now seen corresponding path program 1 times [2021-10-28 09:17:05,097 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:05,097 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072344778] [2021-10-28 09:17:05,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:05,097 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:05,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:05,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:05,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:05,145 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:05,145 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072344778] [2021-10-28 09:17:05,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072344778] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:05,145 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:05,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-28 09:17:05,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483012529] [2021-10-28 09:17:05,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-28 09:17:05,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:05,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-28 09:17:05,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-10-28 09:17:05,148 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:05,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:05,250 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-10-28 09:17:05,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-28 09:17:05,251 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2021-10-28 09:17:05,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:05,252 INFO L225 Difference]: With dead ends: 55 [2021-10-28 09:17:05,252 INFO L226 Difference]: Without dead ends: 55 [2021-10-28 09:17:05,253 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-10-28 09:17:05,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-10-28 09:17:05,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-10-28 09:17:05,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 41 states have (on average 1.3170731707317074) internal successors, (54), 47 states have internal predecessors, (54), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-10-28 09:17:05,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2021-10-28 09:17:05,257 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 22 [2021-10-28 09:17:05,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:05,257 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2021-10-28 09:17:05,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 3 states have internal predecessors, (16), 1 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:05,258 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2021-10-28 09:17:05,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-28 09:17:05,258 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:05,259 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:05,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-10-28 09:17:05,259 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:05,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:05,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1542788213, now seen corresponding path program 1 times [2021-10-28 09:17:05,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:05,260 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027113703] [2021-10-28 09:17:05,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:05,261 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:05,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,339 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:05,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:05,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:05,429 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:05,429 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027113703] [2021-10-28 09:17:05,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027113703] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:05,430 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:05,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-10-28 09:17:05,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711254765] [2021-10-28 09:17:05,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-28 09:17:05,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:05,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-28 09:17:05,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-10-28 09:17:05,432 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:05,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:05,866 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2021-10-28 09:17:05,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-10-28 09:17:05,866 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-10-28 09:17:05,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:05,867 INFO L225 Difference]: With dead ends: 81 [2021-10-28 09:17:05,868 INFO L226 Difference]: Without dead ends: 81 [2021-10-28 09:17:05,868 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-10-28 09:17:05,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-10-28 09:17:05,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 71. [2021-10-28 09:17:05,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 61 states have internal predecessors, (68), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 09:17:05,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 78 transitions. [2021-10-28 09:17:05,874 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 78 transitions. Word has length 24 [2021-10-28 09:17:05,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:05,883 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 78 transitions. [2021-10-28 09:17:05,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:05,883 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 78 transitions. [2021-10-28 09:17:05,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-28 09:17:05,884 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:05,885 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:05,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-28 09:17:05,885 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting cstrchrErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:05,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:05,886 INFO L85 PathProgramCache]: Analyzing trace with hash -45559689, now seen corresponding path program 1 times [2021-10-28 09:17:05,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:05,886 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219708781] [2021-10-28 09:17:05,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:05,886 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:05,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:05,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:05,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:06,000 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:06,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:06,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:06,128 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:06,128 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219708781] [2021-10-28 09:17:06,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219708781] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:06,128 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:06,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-10-28 09:17:06,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350331075] [2021-10-28 09:17:06,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-10-28 09:17:06,129 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:06,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-10-28 09:17:06,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-10-28 09:17:06,130 INFO L87 Difference]: Start difference. First operand 71 states and 78 transitions. Second operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:06,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:06,615 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2021-10-28 09:17:06,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-28 09:17:06,615 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2021-10-28 09:17:06,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:06,629 INFO L225 Difference]: With dead ends: 101 [2021-10-28 09:17:06,629 INFO L226 Difference]: Without dead ends: 101 [2021-10-28 09:17:06,629 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-10-28 09:17:06,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-10-28 09:17:06,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 72. [2021-10-28 09:17:06,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 62 states have internal predecessors, (70), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-10-28 09:17:06,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 80 transitions. [2021-10-28 09:17:06,635 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 80 transitions. Word has length 24 [2021-10-28 09:17:06,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:06,635 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 80 transitions. [2021-10-28 09:17:06,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 11 states have internal predecessors, (18), 2 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-10-28 09:17:06,636 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 80 transitions. [2021-10-28 09:17:06,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-10-28 09:17:06,640 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:06,640 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:06,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-10-28 09:17:06,641 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:06,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:06,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1919056224, now seen corresponding path program 1 times [2021-10-28 09:17:06,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:06,643 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504728391] [2021-10-28 09:17:06,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:06,643 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:06,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:06,689 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:06,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:06,702 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:06,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:06,728 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-28 09:17:06,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:06,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:06,768 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:06,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504728391] [2021-10-28 09:17:06,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1504728391] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:06,769 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:06,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-10-28 09:17:06,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305373181] [2021-10-28 09:17:06,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-28 09:17:06,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:06,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-28 09:17:06,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-10-28 09:17:06,771 INFO L87 Difference]: Start difference. First operand 72 states and 80 transitions. Second operand has 12 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 09:17:07,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:07,050 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2021-10-28 09:17:07,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-28 09:17:07,051 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-10-28 09:17:07,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:07,052 INFO L225 Difference]: With dead ends: 80 [2021-10-28 09:17:07,052 INFO L226 Difference]: Without dead ends: 80 [2021-10-28 09:17:07,053 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-10-28 09:17:07,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-28 09:17:07,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-10-28 09:17:07,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 68 states have internal predecessors, (76), 5 states have call successors, (5), 5 states have call predecessors, (5), 7 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2021-10-28 09:17:07,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 88 transitions. [2021-10-28 09:17:07,058 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 88 transitions. Word has length 27 [2021-10-28 09:17:07,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:07,059 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 88 transitions. [2021-10-28 09:17:07,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 09:17:07,068 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 88 transitions. [2021-10-28 09:17:07,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-10-28 09:17:07,069 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:07,069 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:07,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-10-28 09:17:07,070 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr1REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:07,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:07,070 INFO L85 PathProgramCache]: Analyzing trace with hash -1919056223, now seen corresponding path program 1 times [2021-10-28 09:17:07,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:07,071 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [149073634] [2021-10-28 09:17:07,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:07,071 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:07,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:07,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-10-28 09:17:07,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:07,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-10-28 09:17:07,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:07,200 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-10-28 09:17:07,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-28 09:17:07,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-28 09:17:07,344 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-10-28 09:17:07,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [149073634] [2021-10-28 09:17:07,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [149073634] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-28 09:17:07,345 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-28 09:17:07,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-10-28 09:17:07,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791577347] [2021-10-28 09:17:07,345 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-10-28 09:17:07,345 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-28 09:17:07,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-10-28 09:17:07,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-10-28 09:17:07,348 INFO L87 Difference]: Start difference. First operand 79 states and 88 transitions. Second operand has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 09:17:07,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-28 09:17:07,668 INFO L93 Difference]: Finished difference Result 88 states and 98 transitions. [2021-10-28 09:17:07,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-28 09:17:07,669 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-10-28 09:17:07,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-28 09:17:07,670 INFO L225 Difference]: With dead ends: 88 [2021-10-28 09:17:07,670 INFO L226 Difference]: Without dead ends: 88 [2021-10-28 09:17:07,670 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2021-10-28 09:17:07,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-10-28 09:17:07,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2021-10-28 09:17:07,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 64 states have (on average 1.265625) internal successors, (81), 72 states have internal predecessors, (81), 5 states have call successors, (5), 5 states have call predecessors, (5), 8 states have return successors, (8), 6 states have call predecessors, (8), 4 states have call successors, (8) [2021-10-28 09:17:07,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 94 transitions. [2021-10-28 09:17:07,676 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 94 transitions. Word has length 27 [2021-10-28 09:17:07,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-28 09:17:07,677 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 94 transitions. [2021-10-28 09:17:07,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-10-28 09:17:07,677 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 94 transitions. [2021-10-28 09:17:07,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-10-28 09:17:07,678 INFO L505 BasicCegarLoop]: Found error trace [2021-10-28 09:17:07,678 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:07,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-10-28 09:17:07,679 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr0REQUIRES_VIOLATION === [cstrchrErr0REQUIRES_VIOLATION, cstrchrErr1REQUIRES_VIOLATION, cstrchrErr2REQUIRES_VIOLATION, cstrchrErr3REQUIRES_VIOLATION (and 12 more)] === [2021-10-28 09:17:07,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-28 09:17:07,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1917209182, now seen corresponding path program 1 times [2021-10-28 09:17:07,679 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-28 09:17:07,680 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570326035] [2021-10-28 09:17:07,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-28 09:17:07,680 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-28 09:17:07,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-28 09:17:07,693 INFO L355 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-28 09:17:07,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-28 09:17:07,722 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-10-28 09:17:07,723 INFO L627 BasicCegarLoop]: Counterexample is feasible [2021-10-28 09:17:07,724 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location mainErr0REQUIRES_VIOLATION [2021-10-28 09:17:07,726 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr0REQUIRES_VIOLATION [2021-10-28 09:17:07,726 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr1REQUIRES_VIOLATION [2021-10-28 09:17:07,726 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr2REQUIRES_VIOLATION [2021-10-28 09:17:07,726 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr3REQUIRES_VIOLATION [2021-10-28 09:17:07,727 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr4REQUIRES_VIOLATION [2021-10-28 09:17:07,727 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location cstrchrErr5REQUIRES_VIOLATION [2021-10-28 09:17:07,727 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr0REQUIRES_VIOLATION [2021-10-28 09:17:07,727 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr1REQUIRES_VIOLATION [2021-10-28 09:17:07,728 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr2REQUIRES_VIOLATION [2021-10-28 09:17:07,728 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location build_nondet_StringErr3REQUIRES_VIOLATION [2021-10-28 09:17:07,728 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr1REQUIRES_VIOLATION [2021-10-28 09:17:07,728 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr2ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 09:17:07,728 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr3ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 09:17:07,729 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr4ASSERT_VIOLATIONMEMORY_FREE [2021-10-28 09:17:07,729 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location mainErr5ENSURES_VIOLATIONMEMORY_LEAK [2021-10-28 09:17:07,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-10-28 09:17:07,732 INFO L731 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-28 09:17:07,736 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-28 09:17:07,760 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 09:17:07 BoogieIcfgContainer [2021-10-28 09:17:07,761 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-28 09:17:07,761 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-28 09:17:07,761 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-28 09:17:07,762 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-28 09:17:07,762 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 09:17:01" (3/4) ... [2021-10-28 09:17:07,764 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-28 09:17:07,801 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/witness.graphml [2021-10-28 09:17:07,801 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-28 09:17:07,803 INFO L168 Benchmark]: Toolchain (without parser) took 7512.67 ms. Allocated memory was 115.3 MB in the beginning and 155.2 MB in the end (delta: 39.8 MB). Free memory was 78.6 MB in the beginning and 52.8 MB in the end (delta: 25.8 MB). Peak memory consumption was 64.6 MB. Max. memory is 16.1 GB. [2021-10-28 09:17:07,803 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 115.3 MB. Free memory was 88.9 MB in the beginning and 88.9 MB in the end (delta: 25.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-28 09:17:07,803 INFO L168 Benchmark]: CACSL2BoogieTranslator took 462.41 ms. Allocated memory is still 115.3 MB. Free memory was 78.2 MB in the beginning and 83.1 MB in the end (delta: -4.9 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-10-28 09:17:07,804 INFO L168 Benchmark]: Boogie Preprocessor took 78.97 ms. Allocated memory is still 115.3 MB. Free memory was 83.1 MB in the beginning and 81.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-28 09:17:07,804 INFO L168 Benchmark]: RCFGBuilder took 710.52 ms. Allocated memory is still 115.3 MB. Free memory was 81.0 MB in the beginning and 61.4 MB in the end (delta: 19.6 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. [2021-10-28 09:17:07,805 INFO L168 Benchmark]: TraceAbstraction took 6214.35 ms. Allocated memory was 115.3 MB in the beginning and 155.2 MB in the end (delta: 39.8 MB). Free memory was 60.7 MB in the beginning and 54.9 MB in the end (delta: 5.9 MB). Peak memory consumption was 48.1 MB. Max. memory is 16.1 GB. [2021-10-28 09:17:07,805 INFO L168 Benchmark]: Witness Printer took 40.04 ms. Allocated memory is still 155.2 MB. Free memory was 54.9 MB in the beginning and 52.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-28 09:17:07,807 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 115.3 MB. Free memory was 88.9 MB in the beginning and 88.9 MB in the end (delta: 25.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 462.41 ms. Allocated memory is still 115.3 MB. Free memory was 78.2 MB in the beginning and 83.1 MB in the end (delta: -4.9 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 78.97 ms. Allocated memory is still 115.3 MB. Free memory was 83.1 MB in the beginning and 81.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 710.52 ms. Allocated memory is still 115.3 MB. Free memory was 81.0 MB in the beginning and 61.4 MB in the end (delta: 19.6 MB). Peak memory consumption was 21.0 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6214.35 ms. Allocated memory was 115.3 MB in the beginning and 155.2 MB in the end (delta: 39.8 MB). Free memory was 60.7 MB in the beginning and 54.9 MB in the end (delta: 5.9 MB). Peak memory consumption was 48.1 MB. Max. memory is 16.1 GB. * Witness Printer took 40.04 ms. Allocated memory is still 155.2 MB. Free memory was 54.9 MB in the beginning and 52.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 537]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L536] CALL, EXPR build_nondet_String() [L515] int length = __VERIFIER_nondet_int(); [L516] COND TRUE length < 1 [L517] length = 1 VAL [length=1] [L519] char* nondetString = (char*) malloc(length * sizeof(char)); [L521] int i = 0; VAL [i=0, length=1, nondetString={-1:0}] [L521] COND FALSE !(i < length - 1) VAL [i=0, length=1, nondetString={-1:0}] [L526] nondetString[length-1] = '\0' VAL [i=0, length=1, nondetString={-1:0}] [L527] return nondetString; VAL [\result={-1:0}, i=0, length=1, nondetString={-1:0}] [L536] RET, EXPR build_nondet_String() VAL [build_nondet_String()={-1:0}] [L536] char* s = build_nondet_String(); [L537] CALL cstrchr(s,__VERIFIER_nondet_int()) VAL [\old(c)=2, s={-1:0}] [L531] EXPR \read(*s) VAL [\old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L531] *s != '\0' && *s != (char)c VAL [*s != '\0' && *s != (char)c=0, \old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L531] COND FALSE !(*s != '\0' && *s != (char)c) [L533] EXPR \read(*s) VAL [\old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L533] EXPR (*s == c) ? (char *) s : 0 VAL [(*s == c) ? (char *) s : 0={0:0}, \old(c)=2, \read(*s)=0, c=2, s={-1:0}, s={-1:0}] [L533] return ( (*s == c) ? (char *) s : 0 ); [L537] RET cstrchr(s,__VERIFIER_nondet_int()) VAL [__VERIFIER_nondet_int()=2, cstrchr(s,__VERIFIER_nondet_int())={0:0}, s={-1:0}] - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 531]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 533]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 533]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 523]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 523]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 526]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 526]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 537]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 538]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 538]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 538]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 535]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 10 procedures, 71 locations, 16 error locations. Started 1 CEGAR loops. OverallTime: 6.1s, OverallIterations: 14, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 3.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 456 SDtfs, 828 SDslu, 870 SDs, 0 SdLazy, 2584 SolverSat, 122 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 193 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=84occurred in iteration=13, InterpolantAutomatonStates: 104, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 13 MinimizatonAttempts, 66 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.9s InterpolantComputationTime, 272 NumberOfCodeBlocks, 272 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 231 ConstructedInterpolants, 0 QuantifiedInterpolants, 1102 SizeOfPredicates, 1 NumberOfNonLiveVariables, 65 ConjunctsInSsa, 7 ConjunctsInUnsatCore, 14 InterpolantComputations, 12 PerfectInterpolantSequences, 4/7 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-28 09:17:07,857 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b849a925-72c9-401e-829c-db6e01b66dc6/bin/uautomizer-UnR33cPsHg/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...