./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7 --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 332083c9703e7f789c3b57b3574f68dffe1c5555ad9f8a0d56f0eaba0a86f436 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:35:33,477 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:35:33,479 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:35:33,509 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:35:33,510 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:35:33,512 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:35:33,513 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:35:33,516 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:35:33,518 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:35:33,520 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:35:33,521 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:35:33,523 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:35:33,523 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:35:33,525 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:35:33,526 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:35:33,528 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:35:33,529 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:35:33,530 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:35:33,532 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:35:33,535 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:35:33,537 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:35:33,544 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:35:33,546 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:35:33,547 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:35:33,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:35:33,551 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:35:33,551 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:35:33,553 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:35:33,553 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:35:33,554 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:35:33,555 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:35:33,556 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:35:33,557 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:35:33,557 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:35:33,559 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:35:33,559 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:35:33,560 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:35:33,560 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:35:33,561 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:35:33,562 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:35:33,563 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:35:33,564 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 19:35:33,591 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:35:33,591 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:35:33,592 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:35:33,592 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:35:33,593 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:35:33,593 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:35:33,594 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:35:33,594 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:35:33,594 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:35:33,595 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:35:33,595 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:35:33,596 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:35:33,596 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:35:33,596 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:35:33,597 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:35:33,597 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:35:33,597 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:35:33,597 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:35:33,598 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 19:35:33,598 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 19:35:33,599 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:35:33,599 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:35:33,599 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 19:35:33,599 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:35:33,599 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:35:33,600 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:35:33,600 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 19:35:33,600 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 19:35:33,600 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 19:35:33,600 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:35:33,601 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:35:33,601 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:35:33,601 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:35:33,601 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:35:33,601 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:35:33,602 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:35:33,602 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:35:33,602 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:35:33,602 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:35:33,602 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:35:33,603 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:35:33,603 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:35:33,603 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 332083c9703e7f789c3b57b3574f68dffe1c5555ad9f8a0d56f0eaba0a86f436 [2021-11-25 19:35:33,826 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:35:33,850 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:35:33,852 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:35:33,853 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:35:33,854 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:35:33,855 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i [2021-11-25 19:35:33,928 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/data/dc39562a2/e1b9a4a11d88405a86a67dc6ac7b285a/FLAG6edad4e58 [2021-11-25 19:35:34,507 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:35:34,508 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/sv-benchmarks/c/array-memsafety/subseq-alloca-2.i [2021-11-25 19:35:34,523 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/data/dc39562a2/e1b9a4a11d88405a86a67dc6ac7b285a/FLAG6edad4e58 [2021-11-25 19:35:34,809 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/data/dc39562a2/e1b9a4a11d88405a86a67dc6ac7b285a [2021-11-25 19:35:34,811 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:35:34,812 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:35:34,817 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:35:34,818 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:35:34,821 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:35:34,822 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:35:34" (1/1) ... [2021-11-25 19:35:34,824 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e8d1858 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:34, skipping insertion in model container [2021-11-25 19:35:34,826 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:35:34" (1/1) ... [2021-11-25 19:35:34,835 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:35:34,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:35:35,204 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:35:35,211 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:35:35,266 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:35:35,299 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:35:35,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35 WrapperNode [2021-11-25 19:35:35,300 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:35:35,301 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:35:35,301 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:35:35,301 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:35:35,308 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,347 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,383 INFO L137 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 96 [2021-11-25 19:35:35,383 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:35:35,384 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:35:35,385 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:35:35,385 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:35:35,393 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,404 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,405 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,423 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,427 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,428 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,431 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:35:35,432 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:35:35,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:35:35,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:35:35,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (1/1) ... [2021-11-25 19:35:35,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:35:35,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:35,468 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:35:35,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:35:35,534 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:35:35,534 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:35:35,534 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:35:35,535 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:35:35,535 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:35:35,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:35:35,638 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:35:35,639 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:35:35,981 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:35:36,059 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:35:36,059 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 19:35:36,062 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:35:36 BoogieIcfgContainer [2021-11-25 19:35:36,062 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:35:36,064 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:35:36,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:35:36,067 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:35:36,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:35:34" (1/3) ... [2021-11-25 19:35:36,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19c79481 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:35:36, skipping insertion in model container [2021-11-25 19:35:36,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:35:35" (2/3) ... [2021-11-25 19:35:36,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19c79481 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:35:36, skipping insertion in model container [2021-11-25 19:35:36,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:35:36" (3/3) ... [2021-11-25 19:35:36,070 INFO L111 eAbstractionObserver]: Analyzing ICFG subseq-alloca-2.i [2021-11-25 19:35:36,075 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:35:36,075 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-25 19:35:36,121 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:35:36,128 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:35:36,128 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-25 19:35:36,143 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 15 states have (on average 2.6) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 19:35:36,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:36,149 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 19:35:36,150 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:36,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:36,156 INFO L85 PathProgramCache]: Analyzing trace with hash 158342, now seen corresponding path program 1 times [2021-11-25 19:35:36,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:36,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091720746] [2021-11-25 19:35:36,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:36,167 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:36,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:36,378 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:36,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:36,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091720746] [2021-11-25 19:35:36,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091720746] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:36,380 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:36,380 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 19:35:36,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532581114] [2021-11-25 19:35:36,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:36,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:35:36,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:36,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:35:36,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:36,424 INFO L87 Difference]: Start difference. First operand has 35 states, 15 states have (on average 2.6) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:36,505 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2021-11-25 19:35:36,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:35:36,509 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-25 19:35:36,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:36,517 INFO L225 Difference]: With dead ends: 33 [2021-11-25 19:35:36,517 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 19:35:36,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:36,524 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:36,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 14 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:36,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 19:35:36,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 19:35:36,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 31 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-11-25 19:35:36,557 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 3 [2021-11-25 19:35:36,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:36,557 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-11-25 19:35:36,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,558 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-11-25 19:35:36,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 19:35:36,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:36,558 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 19:35:36,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:35:36,559 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:36,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:36,560 INFO L85 PathProgramCache]: Analyzing trace with hash 158343, now seen corresponding path program 1 times [2021-11-25 19:35:36,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:36,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121088010] [2021-11-25 19:35:36,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:36,561 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:36,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:36,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:36,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:36,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121088010] [2021-11-25 19:35:36,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121088010] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:36,641 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:36,641 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:35:36,642 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113302349] [2021-11-25 19:35:36,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:36,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:36,643 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:36,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:36,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:36,645 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:36,755 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2021-11-25 19:35:36,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:36,756 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-25 19:35:36,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:36,757 INFO L225 Difference]: With dead ends: 62 [2021-11-25 19:35:36,757 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 19:35:36,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:36,760 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:36,760 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 40 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:36,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 19:35:36,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 34. [2021-11-25 19:35:36,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 17 states have (on average 2.235294117647059) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-11-25 19:35:36,767 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 3 [2021-11-25 19:35:36,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:36,768 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-11-25 19:35:36,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,768 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-11-25 19:35:36,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 19:35:36,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:36,769 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 19:35:36,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:35:36,769 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:36,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:36,770 INFO L85 PathProgramCache]: Analyzing trace with hash 5009085, now seen corresponding path program 1 times [2021-11-25 19:35:36,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:36,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94776133] [2021-11-25 19:35:36,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:36,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:36,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:36,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:36,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:36,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94776133] [2021-11-25 19:35:36,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94776133] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:36,805 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:36,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 19:35:36,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780156773] [2021-11-25 19:35:36,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:36,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:35:36,806 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:36,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:35:36,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:36,807 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:36,839 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-11-25 19:35:36,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:35:36,840 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 19:35:36,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:36,840 INFO L225 Difference]: With dead ends: 32 [2021-11-25 19:35:36,840 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 19:35:36,841 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:36,843 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:36,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 14 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:36,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 19:35:36,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-11-25 19:35:36,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 31 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-11-25 19:35:36,848 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 4 [2021-11-25 19:35:36,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:36,849 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-11-25 19:35:36,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:36,849 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-11-25 19:35:36,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 19:35:36,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:36,850 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 19:35:36,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:35:36,850 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:36,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:36,851 INFO L85 PathProgramCache]: Analyzing trace with hash 5009086, now seen corresponding path program 1 times [2021-11-25 19:35:36,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:36,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122411873] [2021-11-25 19:35:36,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:36,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:36,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:36,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:36,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:36,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122411873] [2021-11-25 19:35:36,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122411873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:36,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:36,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:35:36,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359094855] [2021-11-25 19:35:36,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:36,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:35:36,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:36,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:35:36,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:36,943 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:37,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:37,031 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2021-11-25 19:35:37,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:35:37,032 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 19:35:37,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:37,033 INFO L225 Difference]: With dead ends: 57 [2021-11-25 19:35:37,033 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 19:35:37,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:35:37,035 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 58 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:37,036 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 33 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:37,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 19:35:37,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2021-11-25 19:35:37,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:37,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2021-11-25 19:35:37,041 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 4 [2021-11-25 19:35:37,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:37,041 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2021-11-25 19:35:37,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:37,042 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2021-11-25 19:35:37,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-25 19:35:37,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:37,042 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-25 19:35:37,043 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:35:37,043 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:37,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:37,044 INFO L85 PathProgramCache]: Analyzing trace with hash 5011637, now seen corresponding path program 1 times [2021-11-25 19:35:37,044 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:37,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231286856] [2021-11-25 19:35:37,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:37,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:37,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:37,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:37,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:37,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231286856] [2021-11-25 19:35:37,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231286856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:37,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:37,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 19:35:37,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120001838] [2021-11-25 19:35:37,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:37,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:35:37,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:37,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:35:37,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:37,119 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:37,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:37,157 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-11-25 19:35:37,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:35:37,159 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-25 19:35:37,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:37,160 INFO L225 Difference]: With dead ends: 33 [2021-11-25 19:35:37,160 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 19:35:37,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:37,164 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:37,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:37,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 19:35:37,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-25 19:35:37,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 2.0) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:37,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-11-25 19:35:37,178 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 4 [2021-11-25 19:35:37,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:37,179 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-11-25 19:35:37,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:37,180 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-11-25 19:35:37,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:35:37,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:37,185 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-25 19:35:37,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:35:37,186 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:37,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:37,186 INFO L85 PathProgramCache]: Analyzing trace with hash 152254852, now seen corresponding path program 1 times [2021-11-25 19:35:37,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:37,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091686213] [2021-11-25 19:35:37,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:37,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:37,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:37,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:37,313 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:37,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091686213] [2021-11-25 19:35:37,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091686213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:37,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740206930] [2021-11-25 19:35:37,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:37,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:37,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:37,321 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:37,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:35:37,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:37,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:35:37,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:37,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:37,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:37,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:35:37,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:37,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:37,778 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:37,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740206930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:35:37,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224071937] [2021-11-25 19:35:37,796 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-25 19:35:37,797 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:35:37,801 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:35:37,806 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:35:37,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:35:37,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:37,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:38,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:38,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:38,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:38,253 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:35:38,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '476#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_#t~nondet15#1| 127) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1)) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet15#1|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:35:38,551 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:35:38,551 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:38,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 8 [2021-11-25 19:35:38,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061209501] [2021-11-25 19:35:38,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:38,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:35:38,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:38,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:35:38,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:35:38,553 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:38,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:38,776 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2021-11-25 19:35:38,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:35:38,776 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:35:38,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:38,777 INFO L225 Difference]: With dead ends: 87 [2021-11-25 19:35:38,777 INFO L226 Difference]: Without dead ends: 87 [2021-11-25 19:35:38,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:35:38,779 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 170 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:38,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 88 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:35:38,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-25 19:35:38,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 30. [2021-11-25 19:35:38,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 2.0) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:38,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2021-11-25 19:35:38,783 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 5 [2021-11-25 19:35:38,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:38,784 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2021-11-25 19:35:38,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:38,784 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2021-11-25 19:35:38,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 19:35:38,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:38,784 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-25 19:35:38,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:38,985 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:38,985 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:38,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:38,985 INFO L85 PathProgramCache]: Analyzing trace with hash 155360741, now seen corresponding path program 1 times [2021-11-25 19:35:38,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:38,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487780826] [2021-11-25 19:35:38,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:38,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:39,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:39,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:39,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:39,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487780826] [2021-11-25 19:35:39,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487780826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:39,060 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:39,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 19:35:39,060 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128753003] [2021-11-25 19:35:39,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:39,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:35:39,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:39,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:35:39,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:39,062 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:39,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:39,090 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-11-25 19:35:39,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:35:39,090 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-25 19:35:39,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:39,091 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:35:39,091 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 19:35:39,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:39,092 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:39,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 11 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:39,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 19:35:39,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 19:35:39,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:39,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-25 19:35:39,096 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 5 [2021-11-25 19:35:39,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:39,097 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-25 19:35:39,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:39,097 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-25 19:35:39,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:35:39,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:39,098 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-25 19:35:39,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:35:39,098 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:39,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:39,099 INFO L85 PathProgramCache]: Analyzing trace with hash 518833896, now seen corresponding path program 1 times [2021-11-25 19:35:39,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:39,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076738580] [2021-11-25 19:35:39,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:39,100 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:39,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:39,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:39,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:39,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076738580] [2021-11-25 19:35:39,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076738580] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:39,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624501563] [2021-11-25 19:35:39,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:39,174 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:39,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:39,175 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:39,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:35:39,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:39,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:35:39,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:39,272 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:35:39,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:35:39,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:39,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:39,527 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:39,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624501563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:35:39,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182195430] [2021-11-25 19:35:39,529 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-25 19:35:39,530 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:35:39,530 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:35:39,530 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:35:39,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:35:39,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:39,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:39,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:39,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:39,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:39,788 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:35:40,210 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '706#(and (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet17#1|)) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_main_#t~nondet17#1| 127) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 19:35:40,210 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:35:40,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:40,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2021-11-25 19:35:40,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392944871] [2021-11-25 19:35:40,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:40,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:35:40,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:40,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:35:40,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-11-25 19:35:40,212 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:40,385 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2021-11-25 19:35:40,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:35:40,385 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 19:35:40,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:40,386 INFO L225 Difference]: With dead ends: 71 [2021-11-25 19:35:40,386 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 19:35:40,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=99, Invalid=281, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:35:40,387 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 103 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:40,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 106 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:40,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 19:35:40,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 26. [2021-11-25 19:35:40,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-25 19:35:40,391 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2021-11-25 19:35:40,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:40,391 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-25 19:35:40,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,391 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-25 19:35:40,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:35:40,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:40,392 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:35:40,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:40,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:40,601 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:40,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:40,602 INFO L85 PathProgramCache]: Analyzing trace with hash 521217537, now seen corresponding path program 1 times [2021-11-25 19:35:40,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:40,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156354216] [2021-11-25 19:35:40,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:40,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:40,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:40,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:40,646 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:40,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156354216] [2021-11-25 19:35:40,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156354216] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:40,646 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:40,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:35:40,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127722518] [2021-11-25 19:35:40,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:40,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:35:40,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:40,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:35:40,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:40,648 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:40,703 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-11-25 19:35:40,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:40,704 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 19:35:40,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:40,704 INFO L225 Difference]: With dead ends: 43 [2021-11-25 19:35:40,704 INFO L226 Difference]: Without dead ends: 43 [2021-11-25 19:35:40,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:35:40,705 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 104 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:40,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 20 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:40,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-25 19:35:40,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2021-11-25 19:35:40,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 20 states have (on average 2.0) internal successors, (40), 30 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2021-11-25 19:35:40,709 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 6 [2021-11-25 19:35:40,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:40,709 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2021-11-25 19:35:40,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,709 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2021-11-25 19:35:40,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:35:40,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:40,710 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:35:40,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 19:35:40,710 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:40,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:40,710 INFO L85 PathProgramCache]: Analyzing trace with hash 521217536, now seen corresponding path program 1 times [2021-11-25 19:35:40,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:40,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345167487] [2021-11-25 19:35:40,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:40,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:40,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:40,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:40,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:40,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345167487] [2021-11-25 19:35:40,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345167487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:40,736 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:40,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:35:40,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439824181] [2021-11-25 19:35:40,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:40,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:40,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:40,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:40,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:40,738 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:40,766 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-11-25 19:35:40,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:40,767 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 19:35:40,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:40,767 INFO L225 Difference]: With dead ends: 29 [2021-11-25 19:35:40,767 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 19:35:40,767 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:40,768 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 37 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:40,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 12 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:40,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 19:35:40,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-25 19:35:40,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.8) internal successors, (36), 28 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2021-11-25 19:35:40,774 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 6 [2021-11-25 19:35:40,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:40,774 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2021-11-25 19:35:40,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,774 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2021-11-25 19:35:40,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:35:40,775 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:40,775 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:40,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:35:40,775 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:40,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:40,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1621066503, now seen corresponding path program 1 times [2021-11-25 19:35:40,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:40,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13745255] [2021-11-25 19:35:40,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:40,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:40,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:40,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:40,830 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:40,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13745255] [2021-11-25 19:35:40,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13745255] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:40,830 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:40,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:35:40,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516720892] [2021-11-25 19:35:40,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:40,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:40,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:40,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:40,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:40,832 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:40,860 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-11-25 19:35:40,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:40,860 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:35:40,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:40,861 INFO L225 Difference]: With dead ends: 26 [2021-11-25 19:35:40,861 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 19:35:40,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:40,862 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 27 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:40,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 11 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:40,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 19:35:40,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-25 19:35:40,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.6) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-25 19:35:40,865 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 8 [2021-11-25 19:35:40,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:40,865 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-25 19:35:40,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,865 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-25 19:35:40,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:35:40,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:40,866 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:40,866 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-25 19:35:40,866 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:40,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:40,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1621066502, now seen corresponding path program 1 times [2021-11-25 19:35:40,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:40,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44959826] [2021-11-25 19:35:40,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:40,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:40,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:40,911 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:40,911 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:40,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44959826] [2021-11-25 19:35:40,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44959826] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:40,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:40,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:35:40,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335219593] [2021-11-25 19:35:40,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:40,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:35:40,912 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:40,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:35:40,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:35:40,913 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:40,960 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-11-25 19:35:40,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:35:40,961 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-25 19:35:40,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:40,961 INFO L225 Difference]: With dead ends: 30 [2021-11-25 19:35:40,961 INFO L226 Difference]: Without dead ends: 30 [2021-11-25 19:35:40,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:35:40,963 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 36 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:40,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 12 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:40,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-25 19:35:40,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-25 19:35:40,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.5) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2021-11-25 19:35:40,975 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 8 [2021-11-25 19:35:40,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:40,975 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2021-11-25 19:35:40,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:40,976 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2021-11-25 19:35:40,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:35:40,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:40,977 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:40,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 19:35:40,977 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:40,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:40,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1228409389, now seen corresponding path program 1 times [2021-11-25 19:35:40,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:40,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1588553594] [2021-11-25 19:35:40,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:40,978 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:41,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:41,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:41,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:41,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1588553594] [2021-11-25 19:35:41,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1588553594] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:41,386 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:41,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:35:41,386 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947814141] [2021-11-25 19:35:41,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:41,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:35:41,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:41,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:35:41,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:35:41,387 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:41,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:41,746 INFO L93 Difference]: Finished difference Result 75 states and 91 transitions. [2021-11-25 19:35:41,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:35:41,746 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 19:35:41,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:41,747 INFO L225 Difference]: With dead ends: 75 [2021-11-25 19:35:41,747 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 19:35:41,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:35:41,748 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 106 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:41,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 36 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:41,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 19:35:41,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 25. [2021-11-25 19:35:41,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.45) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:41,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-11-25 19:35:41,751 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 10 [2021-11-25 19:35:41,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:41,751 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-11-25 19:35:41,751 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:41,752 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-11-25 19:35:41,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:35:41,752 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:41,752 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:41,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-25 19:35:41,752 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:41,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:41,753 INFO L85 PathProgramCache]: Analyzing trace with hash -573993678, now seen corresponding path program 1 times [2021-11-25 19:35:41,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:41,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169457956] [2021-11-25 19:35:41,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:41,753 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:41,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:41,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:41,774 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:41,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169457956] [2021-11-25 19:35:41,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169457956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:41,774 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:41,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:35:41,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396108193] [2021-11-25 19:35:41,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:41,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:35:41,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:41,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:35:41,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:41,776 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:41,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:41,793 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2021-11-25 19:35:41,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:35:41,793 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:35:41,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:41,793 INFO L225 Difference]: With dead ends: 27 [2021-11-25 19:35:41,794 INFO L226 Difference]: Without dead ends: 26 [2021-11-25 19:35:41,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:35:41,794 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:41,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:35:41,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-25 19:35:41,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-25 19:35:41,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.380952380952381) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:41,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-11-25 19:35:41,797 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 11 [2021-11-25 19:35:41,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:41,797 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-11-25 19:35:41,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:41,797 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-11-25 19:35:41,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 19:35:41,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:41,798 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:41,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 19:35:41,798 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:41,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:41,799 INFO L85 PathProgramCache]: Analyzing trace with hash -757155359, now seen corresponding path program 1 times [2021-11-25 19:35:41,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:41,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12290252] [2021-11-25 19:35:41,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:41,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:41,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:41,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:41,922 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:41,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12290252] [2021-11-25 19:35:41,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12290252] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:41,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:35:41,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:35:41,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752279897] [2021-11-25 19:35:41,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:41,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:35:41,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:41,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:35:41,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:35:41,924 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:42,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:42,041 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-11-25 19:35:42,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:35:42,042 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 19:35:42,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:42,042 INFO L225 Difference]: With dead ends: 34 [2021-11-25 19:35:42,043 INFO L226 Difference]: Without dead ends: 28 [2021-11-25 19:35:42,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:35:42,043 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 9 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:42,044 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 53 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:42,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-25 19:35:42,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-11-25 19:35:42,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:42,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2021-11-25 19:35:42,046 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 12 [2021-11-25 19:35:42,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:42,046 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2021-11-25 19:35:42,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:42,046 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2021-11-25 19:35:42,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 19:35:42,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:42,047 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:42,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 19:35:42,047 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:42,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:42,048 INFO L85 PathProgramCache]: Analyzing trace with hash -2123729020, now seen corresponding path program 1 times [2021-11-25 19:35:42,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:42,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944856608] [2021-11-25 19:35:42,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:42,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:42,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:42,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:42,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:42,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944856608] [2021-11-25 19:35:42,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944856608] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:42,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454352961] [2021-11-25 19:35:42,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:42,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:42,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:42,171 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:42,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:35:42,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:42,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 19:35:42,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:42,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 19:35:42,395 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:35:42,397 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:42,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 20 [2021-11-25 19:35:42,415 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:42,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:35:42,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454352961] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:35:42,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:35:42,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 11 [2021-11-25 19:35:42,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084938080] [2021-11-25 19:35:42,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:35:42,416 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:35:42,416 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:42,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:35:42,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:35:42,417 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:42,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:42,478 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-11-25 19:35:42,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:35:42,478 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 19:35:42,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:42,479 INFO L225 Difference]: With dead ends: 35 [2021-11-25 19:35:42,479 INFO L226 Difference]: Without dead ends: 29 [2021-11-25 19:35:42,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:35:42,480 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 17 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:42,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 39 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 17 Unchecked, 0.0s Time] [2021-11-25 19:35:42,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-25 19:35:42,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-11-25 19:35:42,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 27 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:42,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-11-25 19:35:42,483 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 14 [2021-11-25 19:35:42,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:42,484 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-11-25 19:35:42,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:42,484 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-11-25 19:35:42,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 19:35:42,485 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:42,485 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:42,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:42,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:35:42,713 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:42,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:42,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1702111470, now seen corresponding path program 1 times [2021-11-25 19:35:42,713 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:42,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750120088] [2021-11-25 19:35:42,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:42,714 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:42,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:42,844 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:42,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:42,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750120088] [2021-11-25 19:35:42,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750120088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:42,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927338214] [2021-11-25 19:35:42,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:42,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:42,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:42,846 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:42,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:35:42,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:42,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 19:35:42,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:42,941 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:35:42,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:35:43,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2021-11-25 19:35:43,214 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:43,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:43,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 36 [2021-11-25 19:35:43,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:43,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927338214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:35:43,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799176611] [2021-11-25 19:35:43,550 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:35:43,550 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:35:43,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:35:43,551 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:35:43,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:35:43,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:43,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:43,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:43,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:43,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:43,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:43,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:43,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:43,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:44,020 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:35:44,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:35:44,922 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:35:46,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1553#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:35:46,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:35:46,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:46,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 7] total 17 [2021-11-25 19:35:46,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668814716] [2021-11-25 19:35:46,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:46,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 19:35:46,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:46,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 19:35:46,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=700, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:35:46,154 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 19 states, 18 states have (on average 2.388888888888889) internal successors, (43), 18 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:46,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:46,480 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2021-11-25 19:35:46,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:35:46,481 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.388888888888889) internal successors, (43), 18 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-25 19:35:46,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:46,482 INFO L225 Difference]: With dead ends: 38 [2021-11-25 19:35:46,482 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 19:35:46,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=223, Invalid=1037, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 19:35:46,483 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 239 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:46,484 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 16 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:46,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 19:35:46,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2021-11-25 19:35:46,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 27 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:46,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-11-25 19:35:46,486 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 16 [2021-11-25 19:35:46,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:46,487 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-11-25 19:35:46,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.388888888888889) internal successors, (43), 18 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:46,487 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-11-25 19:35:46,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 19:35:46,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:46,488 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:46,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:46,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:35:46,704 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:46,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:46,705 INFO L85 PathProgramCache]: Analyzing trace with hash -653363033, now seen corresponding path program 1 times [2021-11-25 19:35:46,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:46,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224144923] [2021-11-25 19:35:46,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:46,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:46,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:46,804 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:46,804 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:46,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224144923] [2021-11-25 19:35:46,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224144923] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:46,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689604040] [2021-11-25 19:35:46,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:46,805 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:46,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:46,806 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:46,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:35:46,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:46,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:35:46,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:47,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:47,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:47,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:35:47,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:47,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689604040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:35:47,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487161765] [2021-11-25 19:35:47,122 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:35:47,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:35:47,123 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:35:47,123 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:35:47,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:35:47,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:47,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:47,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:47,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:47,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:47,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:47,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:47,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:47,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:47,539 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:35:47,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:35:48,262 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:35:49,283 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1760#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:35:49,283 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:35:49,283 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:49,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2021-11-25 19:35:49,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968283715] [2021-11-25 19:35:49,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:49,283 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:35:49,283 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:49,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:35:49,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:35:49,284 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:49,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:49,431 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2021-11-25 19:35:49,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:35:49,431 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-25 19:35:49,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:49,432 INFO L225 Difference]: With dead ends: 36 [2021-11-25 19:35:49,432 INFO L226 Difference]: Without dead ends: 33 [2021-11-25 19:35:49,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2021-11-25 19:35:49,433 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 96 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:49,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 47 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:35:49,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-25 19:35:49,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2021-11-25 19:35:49,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:49,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-11-25 19:35:49,436 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 18 [2021-11-25 19:35:49,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:49,436 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-11-25 19:35:49,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:49,437 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-11-25 19:35:49,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 19:35:49,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:49,438 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:49,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 19:35:49,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 19:35:49,644 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:49,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:49,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1218254606, now seen corresponding path program 2 times [2021-11-25 19:35:49,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:49,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613500149] [2021-11-25 19:35:49,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:49,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:49,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:50,002 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:50,003 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:50,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613500149] [2021-11-25 19:35:50,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613500149] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:50,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710262587] [2021-11-25 19:35:50,003 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:35:50,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:50,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:50,004 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:50,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:35:50,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:35:50,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:35:50,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 19:35:50,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:50,142 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:35:50,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:35:50,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:35:50,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:50,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 19:35:50,929 INFO L354 Elim1Store]: treesize reduction 1, result has 97.4 percent of original size [2021-11-25 19:35:50,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 65 treesize of output 75 [2021-11-25 19:35:51,036 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:35:51,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:51,713 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:51,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 40 [2021-11-25 19:35:51,737 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:51,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 103 treesize of output 112 [2021-11-25 19:35:51,766 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:51,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 62 [2021-11-25 19:35:52,662 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:35:52,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710262587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:35:52,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769506658] [2021-11-25 19:35:52,665 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:35:52,665 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:35:52,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:35:52,666 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:35:52,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:35:52,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:52,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:52,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:52,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:52,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:52,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:52,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:52,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:52,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:53,034 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:35:53,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:35:53,748 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:35:55,003 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1994#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:35:55,003 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:35:55,004 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:55,004 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 8] total 23 [2021-11-25 19:35:55,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591837847] [2021-11-25 19:35:55,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:55,005 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:35:55,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:55,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:35:55,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1048, Unknown=7, NotChecked=0, Total=1190 [2021-11-25 19:35:55,006 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 25 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 24 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:55,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:55,589 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-11-25 19:35:55,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:35:55,590 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 24 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 19:35:55,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:55,591 INFO L225 Difference]: With dead ends: 48 [2021-11-25 19:35:55,591 INFO L226 Difference]: Without dead ends: 48 [2021-11-25 19:35:55,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=359, Invalid=2286, Unknown=7, NotChecked=0, Total=2652 [2021-11-25 19:35:55,593 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 22 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:55,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 60 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 84 Invalid, 0 Unknown, 42 Unchecked, 0.1s Time] [2021-11-25 19:35:55,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-25 19:35:55,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 28. [2021-11-25 19:35:55,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:55,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-25 19:35:55,596 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2021-11-25 19:35:55,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:55,596 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-25 19:35:55,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.5833333333333335) internal successors, (62), 24 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:55,596 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-25 19:35:55,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 19:35:55,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:55,597 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:55,632 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:55,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:55,824 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:55,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:55,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1783341369, now seen corresponding path program 2 times [2021-11-25 19:35:55,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:55,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46304165] [2021-11-25 19:35:55,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:55,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:55,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:56,005 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:56,006 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:56,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46304165] [2021-11-25 19:35:56,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46304165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:56,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293328529] [2021-11-25 19:35:56,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:35:56,006 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:56,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:56,007 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:56,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:35:56,107 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:35:56,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:35:56,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-25 19:35:56,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:35:56,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:56,443 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:35:56,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 19:35:56,552 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:56,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:35:56,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 19:35:56,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:35:56,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 19:35:56,840 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:35:56,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293328529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:35:56,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2014466330] [2021-11-25 19:35:56,844 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:35:56,844 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:35:56,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:35:56,845 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:35:56,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:35:56,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:35:56,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:35:56,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:56,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:56,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:57,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:35:57,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:57,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:57,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:35:57,234 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:35:57,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:35:57,781 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:35:58,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2277#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:35:58,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:35:58,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:35:58,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 23 [2021-11-25 19:35:58,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911178624] [2021-11-25 19:35:58,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:35:58,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 19:35:58,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:35:58,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 19:35:58,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=924, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 19:35:58,798 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 23 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:59,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:35:59,293 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-11-25 19:35:59,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 19:35:59,293 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 19:35:59,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:35:59,294 INFO L225 Difference]: With dead ends: 53 [2021-11-25 19:35:59,294 INFO L226 Difference]: Without dead ends: 39 [2021-11-25 19:35:59,295 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=283, Invalid=1787, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 19:35:59,296 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 151 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:35:59,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 60 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 184 Invalid, 0 Unknown, 32 Unchecked, 0.1s Time] [2021-11-25 19:35:59,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-25 19:35:59,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2021-11-25 19:35:59,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:59,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-25 19:35:59,298 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 24 [2021-11-25 19:35:59,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:35:59,298 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-25 19:35:59,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.782608695652174) internal successors, (64), 23 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:35:59,299 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-25 19:35:59,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:35:59,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:35:59,300 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:35:59,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:35:59,508 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:59,508 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:35:59,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:35:59,509 INFO L85 PathProgramCache]: Analyzing trace with hash -2089104815, now seen corresponding path program 3 times [2021-11-25 19:35:59,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:35:59,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400713067] [2021-11-25 19:35:59,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:35:59,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:35:59,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:35:59,965 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 13 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:35:59,965 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:35:59,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400713067] [2021-11-25 19:35:59,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400713067] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:35:59,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292342392] [2021-11-25 19:35:59,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:35:59,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:35:59,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:35:59,968 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:35:59,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:36:00,067 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:36:00,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:00,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 19:36:00,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:00,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:00,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:00,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:00,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:00,665 INFO L354 Elim1Store]: treesize reduction 26, result has 31.6 percent of original size [2021-11-25 19:36:00,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 36 [2021-11-25 19:36:00,676 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 13 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:00,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:00,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 38 [2021-11-25 19:36:00,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:36:00,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:36:00,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:36:00,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 60 [2021-11-25 19:36:01,186 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 27 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:01,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292342392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:01,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649820241] [2021-11-25 19:36:01,188 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:01,188 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:01,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:01,189 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:01,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:01,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:01,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:01,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:01,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:01,647 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:01,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:02,301 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:03,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2626#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:03,896 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:03,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:03,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 35 [2021-11-25 19:36:03,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178705139] [2021-11-25 19:36:03,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:03,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 19:36:03,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:03,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 19:36:03,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1870, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 19:36:03,898 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:04,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:04,927 INFO L93 Difference]: Finished difference Result 113 states and 117 transitions. [2021-11-25 19:36:04,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 19:36:04,927 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-25 19:36:04,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:04,928 INFO L225 Difference]: With dead ends: 113 [2021-11-25 19:36:04,928 INFO L226 Difference]: Without dead ends: 77 [2021-11-25 19:36:04,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1157 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=442, Invalid=3464, Unknown=0, NotChecked=0, Total=3906 [2021-11-25 19:36:04,930 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 110 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 166 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:04,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 133 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 241 Invalid, 0 Unknown, 166 Unchecked, 0.2s Time] [2021-11-25 19:36:04,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-25 19:36:04,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 38. [2021-11-25 19:36:04,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:04,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-11-25 19:36:04,933 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 32 [2021-11-25 19:36:04,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:04,933 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-11-25 19:36:04,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.111111111111111) internal successors, (76), 35 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:04,934 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-11-25 19:36:04,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 19:36:04,935 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:04,935 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:04,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:05,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:05,144 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:05,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:05,144 INFO L85 PathProgramCache]: Analyzing trace with hash -848906949, now seen corresponding path program 4 times [2021-11-25 19:36:05,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:05,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98408756] [2021-11-25 19:36:05,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:05,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:05,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:05,273 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:05,273 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:05,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98408756] [2021-11-25 19:36:05,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98408756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:05,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18322658] [2021-11-25 19:36:05,273 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:36:05,273 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:05,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:05,275 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:05,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:36:05,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:05,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 19:36:05,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:05,516 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:05,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:05,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:36:05,687 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:05,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18322658] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:05,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1568655653] [2021-11-25 19:36:05,689 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:05,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:05,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:05,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:05,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:05,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:05,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:05,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:05,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:05,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:05,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:05,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:05,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:05,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:06,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:06,097 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:06,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:06,639 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:07,793 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3042#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:07,793 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:07,794 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:07,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 21 [2021-11-25 19:36:07,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842138354] [2021-11-25 19:36:07,794 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:07,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 19:36:07,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:07,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 19:36:07,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2021-11-25 19:36:07,796 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 22 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 22 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:08,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:08,024 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-11-25 19:36:08,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:36:08,025 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 22 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 19:36:08,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:08,027 INFO L225 Difference]: With dead ends: 49 [2021-11-25 19:36:08,027 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 19:36:08,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 74 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=214, Invalid=1192, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:36:08,028 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 159 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 255 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:08,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 81 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 255 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:36:08,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 19:36:08,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2021-11-25 19:36:08,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:08,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-11-25 19:36:08,030 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 34 [2021-11-25 19:36:08,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:08,031 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-11-25 19:36:08,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 22 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:08,031 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-11-25 19:36:08,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 19:36:08,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:08,032 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:08,054 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:08,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-25 19:36:08,240 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:08,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:08,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1930026075, now seen corresponding path program 5 times [2021-11-25 19:36:08,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:08,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690960425] [2021-11-25 19:36:08,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:08,241 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:08,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:08,432 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 39 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:08,432 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:08,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690960425] [2021-11-25 19:36:08,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690960425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:08,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [960876635] [2021-11-25 19:36:08,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:36:08,433 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:08,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:08,433 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:08,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:36:08,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 19:36:08,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:08,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 19:36:08,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:08,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:08,807 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 39 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:08,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:08,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:36:08,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:36:08,988 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 18 proven. 39 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:08,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [960876635] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:08,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [602460108] [2021-11-25 19:36:08,990 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:08,990 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:08,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:08,991 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:08,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:09,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:09,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:09,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:09,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:09,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:09,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:09,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:09,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:09,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:09,345 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:09,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:09,879 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:10,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3415#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:10,841 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:10,841 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:10,842 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2021-11-25 19:36:10,842 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939074425] [2021-11-25 19:36:10,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:10,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 19:36:10,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:10,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 19:36:10,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:36:10,843 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 24 states, 24 states have (on average 2.875) internal successors, (69), 24 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:11,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:11,181 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2021-11-25 19:36:11,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:36:11,182 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.875) internal successors, (69), 24 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 19:36:11,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:11,182 INFO L225 Difference]: With dead ends: 71 [2021-11-25 19:36:11,182 INFO L226 Difference]: Without dead ends: 47 [2021-11-25 19:36:11,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=237, Invalid=1743, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 19:36:11,184 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 110 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:11,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 151 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 358 Invalid, 0 Unknown, 31 Unchecked, 0.2s Time] [2021-11-25 19:36:11,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-25 19:36:11,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-11-25 19:36:11,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 45 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:11,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-11-25 19:36:11,186 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 40 [2021-11-25 19:36:11,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:11,187 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-11-25 19:36:11,187 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.875) internal successors, (69), 24 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:11,187 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-11-25 19:36:11,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 19:36:11,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:11,188 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:11,210 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-25 19:36:11,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 19:36:11,396 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:11,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:11,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1241957051, now seen corresponding path program 6 times [2021-11-25 19:36:11,398 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:11,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369273119] [2021-11-25 19:36:11,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:11,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:11,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:11,564 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 4 proven. 60 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:11,564 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:11,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369273119] [2021-11-25 19:36:11,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369273119] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:11,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1584530906] [2021-11-25 19:36:11,565 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:36:11,565 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:11,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:11,568 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:11,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:36:11,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:36:11,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:11,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:36:11,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:11,714 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:36:11,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:36:12,011 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:12,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:12,392 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 16 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:12,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1584530906] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:12,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [238439894] [2021-11-25 19:36:12,394 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:12,394 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:12,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:12,394 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:12,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:12,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:12,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:12,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:12,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:12,795 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:12,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:13,227 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:14,308 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3846#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:14,308 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:14,308 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:14,308 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 34 [2021-11-25 19:36:14,308 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011531576] [2021-11-25 19:36:14,309 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:14,309 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 19:36:14,309 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:14,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 19:36:14,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1831, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 19:36:14,311 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 36 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 35 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:14,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:14,604 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2021-11-25 19:36:14,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:36:14,605 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 35 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-25 19:36:14,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:14,605 INFO L225 Difference]: With dead ends: 57 [2021-11-25 19:36:14,605 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 19:36:14,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=410, Invalid=2346, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 19:36:14,607 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 228 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:14,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [228 Valid, 118 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:36:14,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 19:36:14,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2021-11-25 19:36:14,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 50 states have (on average 1.08) internal successors, (54), 51 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:14,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-11-25 19:36:14,610 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 42 [2021-11-25 19:36:14,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:14,610 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-11-25 19:36:14,610 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 35 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:14,610 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-11-25 19:36:14,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 19:36:14,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:14,611 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:14,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:14,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:14,812 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:14,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:14,812 INFO L85 PathProgramCache]: Analyzing trace with hash -2037074715, now seen corresponding path program 7 times [2021-11-25 19:36:14,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:14,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191249936] [2021-11-25 19:36:14,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:14,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:14,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:15,039 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 23 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:15,040 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:15,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191249936] [2021-11-25 19:36:15,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191249936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:15,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780521511] [2021-11-25 19:36:15,040 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:36:15,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:15,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:15,043 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:15,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:36:15,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:15,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 19:36:15,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:15,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:15,634 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 23 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:15,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:15,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:36:15,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:36:16,045 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 23 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:16,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780521511] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:16,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [425949363] [2021-11-25 19:36:16,047 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:16,048 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:16,048 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:16,048 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:16,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:16,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:16,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:16,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:16,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:16,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:16,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:16,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:16,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:16,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:16,355 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:16,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:16,846 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:18,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4299#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:18,388 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:18,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:18,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 37 [2021-11-25 19:36:18,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760907729] [2021-11-25 19:36:18,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:18,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 19:36:18,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:18,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 19:36:18,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2053, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 19:36:18,390 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 38 states, 38 states have (on average 2.789473684210526) internal successors, (106), 37 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:18,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:18,970 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-11-25 19:36:18,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 19:36:18,970 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.789473684210526) internal successors, (106), 37 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-25 19:36:18,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:18,971 INFO L225 Difference]: With dead ends: 85 [2021-11-25 19:36:18,971 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 19:36:18,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 105 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=364, Invalid=3296, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 19:36:18,973 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 167 mSDsluCounter, 264 mSDsCounter, 0 mSdLazyCounter, 642 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:18,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [167 Valid, 235 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 642 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:36:18,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 19:36:18,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-11-25 19:36:18,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 53 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:18,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2021-11-25 19:36:18,975 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 48 [2021-11-25 19:36:18,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:18,975 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2021-11-25 19:36:18,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.789473684210526) internal successors, (106), 37 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:18,976 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2021-11-25 19:36:18,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:36:18,977 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:18,977 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:19,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:19,184 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 19:36:19,184 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:19,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:19,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1699640369, now seen corresponding path program 8 times [2021-11-25 19:36:19,185 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:19,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115523000] [2021-11-25 19:36:19,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:19,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:19,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:19,401 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 9 proven. 91 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:19,401 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:19,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115523000] [2021-11-25 19:36:19,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115523000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:19,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182561703] [2021-11-25 19:36:19,401 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:36:19,402 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:19,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:19,403 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:19,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:36:19,546 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 19:36:19,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:19,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 19:36:19,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:19,805 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:19,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:20,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 19:36:20,110 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:20,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182561703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:20,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707926852] [2021-11-25 19:36:20,112 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:20,112 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:20,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:20,112 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:20,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:20,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:20,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:20,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:20,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:20,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:20,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:20,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:20,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:20,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:20,440 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:20,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:20,948 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:22,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4803#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:22,256 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:22,256 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:22,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 34 [2021-11-25 19:36:22,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220495253] [2021-11-25 19:36:22,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:22,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 19:36:22,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:22,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 19:36:22,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1733, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 19:36:22,259 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand has 35 states, 34 states have (on average 3.9411764705882355) internal successors, (134), 35 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:22,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:22,624 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2021-11-25 19:36:22,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:36:22,625 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 3.9411764705882355) internal successors, (134), 35 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-25 19:36:22,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:22,626 INFO L225 Difference]: With dead ends: 65 [2021-11-25 19:36:22,626 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 19:36:22,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 112 SyntacticMatches, 6 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1102 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=430, Invalid=2326, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 19:36:22,627 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 430 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:22,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [430 Valid, 110 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:36:22,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 19:36:22,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2021-11-25 19:36:22,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:22,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-11-25 19:36:22,630 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 50 [2021-11-25 19:36:22,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:22,630 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-11-25 19:36:22,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 3.9411764705882355) internal successors, (134), 35 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:22,631 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-11-25 19:36:22,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 19:36:22,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:22,631 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:22,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:22,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-25 19:36:22,848 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:22,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:22,848 INFO L85 PathProgramCache]: Analyzing trace with hash -1418300433, now seen corresponding path program 9 times [2021-11-25 19:36:22,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:22,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137655284] [2021-11-25 19:36:22,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:22,849 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:22,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:23,142 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 28 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:23,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:23,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137655284] [2021-11-25 19:36:23,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137655284] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:23,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266468617] [2021-11-25 19:36:23,143 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:36:23,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:23,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:23,148 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:23,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:36:23,282 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:36:23,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:23,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 19:36:23,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:23,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:31,670 INFO L354 Elim1Store]: treesize reduction 101, result has 13.7 percent of original size [2021-11-25 19:36:31,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 62 treesize of output 44 [2021-11-25 19:36:31,684 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 37 proven. 65 refuted. 31 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:31,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:32,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 61 treesize of output 53 [2021-11-25 19:36:32,277 INFO L354 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2021-11-25 19:36:32,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 101 treesize of output 85 [2021-11-25 19:36:32,525 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 64 proven. 69 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:32,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266468617] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:32,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331699986] [2021-11-25 19:36:32,528 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:32,528 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:32,529 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:32,529 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:32,529 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:32,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:32,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:32,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:32,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:32,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:32,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:32,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:32,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:32,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:32,827 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:32,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:33,283 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:35,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5337#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:35,110 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:35,110 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:35,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23, 23] total 53 [2021-11-25 19:36:35,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077528023] [2021-11-25 19:36:35,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:35,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 19:36:35,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:35,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 19:36:35,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=3547, Unknown=20, NotChecked=0, Total=3906 [2021-11-25 19:36:35,114 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 53 states, 53 states have (on average 2.7169811320754715) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:44,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:44,172 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2021-11-25 19:36:44,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-25 19:36:44,173 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.7169811320754715) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-25 19:36:44,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:44,174 INFO L225 Difference]: With dead ends: 99 [2021-11-25 19:36:44,174 INFO L226 Difference]: Without dead ends: 63 [2021-11-25 19:36:44,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 121 SyntacticMatches, 8 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 2435 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=736, Invalid=6553, Unknown=21, NotChecked=0, Total=7310 [2021-11-25 19:36:44,176 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 124 mSDsluCounter, 236 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:44,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 210 Invalid, 740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 585 Invalid, 0 Unknown, 102 Unchecked, 0.3s Time] [2021-11-25 19:36:44,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-25 19:36:44,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-11-25 19:36:44,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:44,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-11-25 19:36:44,178 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 56 [2021-11-25 19:36:44,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:44,179 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-11-25 19:36:44,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.7169811320754715) internal successors, (144), 53 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:44,179 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-11-25 19:36:44,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 19:36:44,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:44,180 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:44,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:44,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:44,388 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:44,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:44,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1628782375, now seen corresponding path program 10 times [2021-11-25 19:36:44,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:44,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031232968] [2021-11-25 19:36:44,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:44,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:44,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:44,653 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:44,653 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:44,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031232968] [2021-11-25 19:36:44,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031232968] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:44,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [289237229] [2021-11-25 19:36:44,653 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:36:44,653 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:44,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:44,654 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:44,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 19:36:44,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:44,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-25 19:36:44,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:45,051 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 25 proven. 119 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:45,051 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:45,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:36:45,395 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 25 proven. 119 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:45,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [289237229] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:45,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2005756250] [2021-11-25 19:36:45,397 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:45,398 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:45,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:45,398 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:45,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:45,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:45,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:45,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:45,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:45,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:45,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:45,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:45,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:45,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:45,747 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:45,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:46,314 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:47,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5937#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:47,755 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:47,755 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:47,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 33 [2021-11-25 19:36:47,755 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928082375] [2021-11-25 19:36:47,755 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:47,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-25 19:36:47,756 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:47,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-25 19:36:47,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1681, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:36:47,757 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 34 states, 33 states have (on average 3.727272727272727) internal successors, (123), 34 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:48,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:48,217 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2021-11-25 19:36:48,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:36:48,217 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 3.727272727272727) internal successors, (123), 34 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 19:36:48,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:48,218 INFO L225 Difference]: With dead ends: 73 [2021-11-25 19:36:48,218 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 19:36:48,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1053 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=409, Invalid=2347, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 19:36:48,220 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 234 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:48,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 211 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:36:48,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 19:36:48,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2021-11-25 19:36:48,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 67 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:48,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-11-25 19:36:48,223 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 58 [2021-11-25 19:36:48,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:48,223 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-11-25 19:36:48,224 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 3.727272727272727) internal successors, (123), 34 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:48,224 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-11-25 19:36:48,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 19:36:48,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:48,225 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:48,250 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:48,425 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 19:36:48,425 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:48,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:48,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1674430087, now seen corresponding path program 11 times [2021-11-25 19:36:48,426 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:48,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329064654] [2021-11-25 19:36:48,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:48,426 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:48,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:48,707 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 33 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:48,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:48,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329064654] [2021-11-25 19:36:48,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329064654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:48,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677845722] [2021-11-25 19:36:48,708 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:36:48,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:48,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:48,709 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:48,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:36:48,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-25 19:36:48,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:48,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 19:36:48,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:49,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,196 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 33 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:49,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:49,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:36:49,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:36:49,440 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 33 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:49,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677845722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:49,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [782304431] [2021-11-25 19:36:49,442 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:49,442 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:49,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:49,443 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:49,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:49,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:49,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:49,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:49,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:49,779 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:49,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:50,257 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:51,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6517#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:51,942 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:51,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:51,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 33 [2021-11-25 19:36:51,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290098172] [2021-11-25 19:36:51,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:51,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 19:36:51,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:51,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 19:36:51,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1657, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 19:36:51,944 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 33 states, 33 states have (on average 3.0) internal successors, (99), 33 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:52,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:52,702 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2021-11-25 19:36:52,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 19:36:52,703 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0) internal successors, (99), 33 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-25 19:36:52,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:52,703 INFO L225 Difference]: With dead ends: 113 [2021-11-25 19:36:52,703 INFO L226 Difference]: Without dead ends: 71 [2021-11-25 19:36:52,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 158 SyntacticMatches, 10 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 943 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=318, Invalid=3222, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 19:36:52,705 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 139 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 859 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:52,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 322 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 859 Invalid, 0 Unknown, 34 Unchecked, 0.4s Time] [2021-11-25 19:36:52,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-25 19:36:52,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-11-25 19:36:52,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:52,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-11-25 19:36:52,708 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 64 [2021-11-25 19:36:52,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:52,709 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-11-25 19:36:52,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.0) internal successors, (99), 33 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:52,709 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-11-25 19:36:52,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:36:52,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:52,710 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:52,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:52,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 19:36:52,916 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:52,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:52,916 INFO L85 PathProgramCache]: Analyzing trace with hash -1289225117, now seen corresponding path program 12 times [2021-11-25 19:36:52,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:52,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114420031] [2021-11-25 19:36:52,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:52,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:52,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:53,235 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 25 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:53,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:53,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114420031] [2021-11-25 19:36:53,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114420031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:53,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974828009] [2021-11-25 19:36:53,235 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:36:53,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:53,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:53,238 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:53,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 19:36:53,404 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:36:53,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:36:53,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-25 19:36:53,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:53,425 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:36:53,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:36:54,044 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 36 proven. 160 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:54,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:36:54,840 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 49 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:54,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974828009] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:36:54,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1146764928] [2021-11-25 19:36:54,841 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:36:54,842 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:36:54,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:36:54,842 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:36:54,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:36:54,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:36:54,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:36:54,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:54,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:54,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:54,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:36:55,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:55,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:55,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:36:55,111 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:36:55,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:36:55,586 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:36:57,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7188#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:36:57,496 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:36:57,496 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:36:57,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 52 [2021-11-25 19:36:57,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131501331] [2021-11-25 19:36:57,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:36:57,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 19:36:57,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:36:57,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 19:36:57,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=443, Invalid=3589, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 19:36:57,499 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 54 states, 53 states have (on average 3.69811320754717) internal successors, (196), 53 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:58,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:36:58,043 INFO L93 Difference]: Finished difference Result 81 states and 83 transitions. [2021-11-25 19:36:58,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 19:36:58,043 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 3.69811320754717) internal successors, (196), 53 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-25 19:36:58,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:36:58,044 INFO L225 Difference]: With dead ends: 81 [2021-11-25 19:36:58,044 INFO L226 Difference]: Without dead ends: 79 [2021-11-25 19:36:58,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 143 SyntacticMatches, 8 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2273 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=794, Invalid=4608, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 19:36:58,045 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 366 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 891 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 366 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 958 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:36:58,046 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [366 Valid, 286 Invalid, 958 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 891 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:36:58,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-25 19:36:58,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-11-25 19:36:58,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 74 states have (on average 1.054054054054054) internal successors, (78), 75 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:58,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-11-25 19:36:58,049 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 66 [2021-11-25 19:36:58,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:36:58,049 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-11-25 19:36:58,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 3.69811320754717) internal successors, (196), 53 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:36:58,049 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-11-25 19:36:58,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-25 19:36:58,050 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:36:58,050 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:36:58,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:36:58,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:58,264 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:36:58,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:36:58,264 INFO L85 PathProgramCache]: Analyzing trace with hash 1651713411, now seen corresponding path program 13 times [2021-11-25 19:36:58,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:36:58,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65859764] [2021-11-25 19:36:58,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:36:58,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:36:58,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 38 proven. 203 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:36:58,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:36:58,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65859764] [2021-11-25 19:36:58,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65859764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:36:58,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118280090] [2021-11-25 19:36:58,636 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:36:58,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:36:58,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:36:58,637 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:36:58,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 19:36:58,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:36:58,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 19:36:58,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:36:58,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:00,339 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:37:00,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 19:37:00,500 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 36 proven. 205 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:00,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:01,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:37:01,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 19:37:01,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:37:01,349 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 36 proven. 205 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:01,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2118280090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:01,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453697487] [2021-11-25 19:37:01,351 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:01,351 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:01,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:01,351 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:01,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:01,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:01,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:01,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:01,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:01,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:01,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:01,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:01,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:01,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:01,681 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:01,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:02,161 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:04,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7855#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:04,496 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:04,496 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:04,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 54 [2021-11-25 19:37:04,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123662479] [2021-11-25 19:37:04,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:04,497 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 19:37:04,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:04,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 19:37:04,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=3723, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 19:37:04,499 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 54 states, 54 states have (on average 3.6296296296296298) internal successors, (196), 54 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:05,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:05,516 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2021-11-25 19:37:05,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 19:37:05,518 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.6296296296296298) internal successors, (196), 54 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-25 19:37:05,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:05,519 INFO L225 Difference]: With dead ends: 138 [2021-11-25 19:37:05,519 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 19:37:05,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 182 SyntacticMatches, 13 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2102 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=529, Invalid=5791, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 19:37:05,520 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 111 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:05,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 501 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 683 Invalid, 0 Unknown, 98 Unchecked, 0.3s Time] [2021-11-25 19:37:05,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 19:37:05,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2021-11-25 19:37:05,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 82 states have (on average 1.048780487804878) internal successors, (86), 83 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:05,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2021-11-25 19:37:05,523 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 72 [2021-11-25 19:37:05,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:05,523 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2021-11-25 19:37:05,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.6296296296296298) internal successors, (196), 54 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:05,523 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2021-11-25 19:37:05,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-25 19:37:05,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:05,524 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:05,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:05,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:05,728 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:05,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:05,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1493981197, now seen corresponding path program 14 times [2021-11-25 19:37:05,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:05,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860406022] [2021-11-25 19:37:05,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:05,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:05,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:06,110 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 43 proven. 264 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:06,111 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:06,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860406022] [2021-11-25 19:37:06,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860406022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:06,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68597959] [2021-11-25 19:37:06,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:37:06,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:06,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:06,113 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:06,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 19:37:06,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-25 19:37:06,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:37:06,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 19:37:06,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:06,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:06,808 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 43 proven. 264 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:06,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:06,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:37:06,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:37:07,080 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 43 proven. 264 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:07,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68597959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:07,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147825811] [2021-11-25 19:37:07,082 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:07,082 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:07,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:07,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:07,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:07,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:07,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:07,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:07,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:07,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:07,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:07,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:07,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:07,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:07,401 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:07,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:07,795 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:08,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8654#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:08,989 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:08,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:08,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 39 [2021-11-25 19:37:08,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151064439] [2021-11-25 19:37:08,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:08,989 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 19:37:08,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:08,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 19:37:08,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=2187, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 19:37:08,990 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 39 states, 39 states have (on average 3.051282051282051) internal successors, (119), 39 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:10,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:10,017 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2021-11-25 19:37:10,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-25 19:37:10,017 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.051282051282051) internal successors, (119), 39 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-25 19:37:10,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:10,018 INFO L225 Difference]: With dead ends: 141 [2021-11-25 19:37:10,018 INFO L226 Difference]: Without dead ends: 87 [2021-11-25 19:37:10,019 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=372, Invalid=4458, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 19:37:10,019 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 207 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 1288 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 455 SdHoareTripleChecker+Invalid, 1395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1288 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:10,020 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 455 Invalid, 1395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1288 Invalid, 0 Unknown, 52 Unchecked, 0.5s Time] [2021-11-25 19:37:10,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-25 19:37:10,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-11-25 19:37:10,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 84 states have (on average 1.0476190476190477) internal successors, (88), 85 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:10,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2021-11-25 19:37:10,022 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 80 [2021-11-25 19:37:10,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:10,022 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2021-11-25 19:37:10,022 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.051282051282051) internal successors, (119), 39 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:10,023 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2021-11-25 19:37:10,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-25 19:37:10,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:10,023 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:10,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:10,223 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:10,224 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:10,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:10,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1535313655, now seen corresponding path program 15 times [2021-11-25 19:37:10,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:10,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500007764] [2021-11-25 19:37:10,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:10,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:10,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:10,663 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 49 proven. 275 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:10,663 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:10,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500007764] [2021-11-25 19:37:10,664 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500007764] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:10,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936465451] [2021-11-25 19:37:10,664 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:37:10,664 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:10,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:10,665 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:10,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 19:37:10,913 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:37:10,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:37:10,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-25 19:37:10,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:10,935 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:37:10,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:37:11,669 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 64 proven. 260 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:11,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:12,640 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 81 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:12,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936465451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:12,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715498403] [2021-11-25 19:37:12,641 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:12,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:12,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:12,642 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:12,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:12,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:12,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:12,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:12,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:12,992 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:12,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:13,391 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:14,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9485#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:14,665 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:14,665 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:14,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22, 22] total 64 [2021-11-25 19:37:14,665 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216265807] [2021-11-25 19:37:14,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:14,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-25 19:37:14,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:14,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-25 19:37:14,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=619, Invalid=5081, Unknown=0, NotChecked=0, Total=5700 [2021-11-25 19:37:14,667 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand has 66 states, 65 states have (on average 3.753846153846154) internal successors, (244), 65 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:15,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:15,468 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-11-25 19:37:15,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:37:15,468 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 3.753846153846154) internal successors, (244), 65 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-25 19:37:15,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:15,469 INFO L225 Difference]: With dead ends: 97 [2021-11-25 19:37:15,469 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 19:37:15,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2720 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1125, Invalid=6531, Unknown=0, NotChecked=0, Total=7656 [2021-11-25 19:37:15,470 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 490 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 1365 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 1458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 1365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:15,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [490 Valid, 417 Invalid, 1458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 1365 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:37:15,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 19:37:15,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2021-11-25 19:37:15,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 90 states have (on average 1.0444444444444445) internal successors, (94), 91 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:15,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-11-25 19:37:15,473 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 82 [2021-11-25 19:37:15,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:15,473 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-11-25 19:37:15,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 3.753846153846154) internal successors, (244), 65 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:15,474 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-11-25 19:37:15,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-25 19:37:15,475 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:15,475 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:15,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:15,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-25 19:37:15,692 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:15,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:15,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1376194281, now seen corresponding path program 16 times [2021-11-25 19:37:15,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:15,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471411401] [2021-11-25 19:37:15,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:15,693 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:15,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:16,168 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 48 proven. 333 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:16,168 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:16,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471411401] [2021-11-25 19:37:16,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1471411401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:16,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861764076] [2021-11-25 19:37:16,169 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:37:16,169 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:16,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:16,172 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:16,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 19:37:16,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:16,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-25 19:37:16,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:16,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:16,780 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 48 proven. 333 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:16,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:16,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:37:16,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:37:17,058 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 48 proven. 333 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:17,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861764076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:17,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154921860] [2021-11-25 19:37:17,059 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:17,060 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:17,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:17,060 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:17,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:17,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:17,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:17,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:17,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:17,431 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:17,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:17,936 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:20,086 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10272#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:20,087 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:20,087 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:20,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2021-11-25 19:37:20,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529251427] [2021-11-25 19:37:20,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:20,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-25 19:37:20,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:20,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-25 19:37:20,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2479, Unknown=0, NotChecked=0, Total=2652 [2021-11-25 19:37:20,089 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 42 states, 42 states have (on average 3.0714285714285716) internal successors, (129), 42 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:21,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:21,348 INFO L93 Difference]: Finished difference Result 155 states and 157 transitions. [2021-11-25 19:37:21,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 19:37:21,349 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.0714285714285716) internal successors, (129), 42 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-25 19:37:21,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:21,349 INFO L225 Difference]: With dead ends: 155 [2021-11-25 19:37:21,349 INFO L226 Difference]: Without dead ends: 95 [2021-11-25 19:37:21,350 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 224 SyntacticMatches, 13 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=399, Invalid=5151, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 19:37:21,350 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 227 mSDsluCounter, 678 mSDsCounter, 0 mSdLazyCounter, 1794 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 1890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:21,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 650 Invalid, 1890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1794 Invalid, 0 Unknown, 35 Unchecked, 0.7s Time] [2021-11-25 19:37:21,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-25 19:37:21,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-11-25 19:37:21,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 92 states have (on average 1.0434782608695652) internal successors, (96), 93 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:21,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-11-25 19:37:21,353 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 88 [2021-11-25 19:37:21,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:21,353 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-11-25 19:37:21,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.0714285714285716) internal successors, (129), 42 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:21,353 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-11-25 19:37:21,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-25 19:37:21,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:21,354 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:21,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:21,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-25 19:37:21,580 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:21,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:21,580 INFO L85 PathProgramCache]: Analyzing trace with hash -462481919, now seen corresponding path program 17 times [2021-11-25 19:37:21,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:21,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130449992] [2021-11-25 19:37:21,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:21,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:21,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:22,055 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 64 proven. 336 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:22,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:22,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130449992] [2021-11-25 19:37:22,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130449992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:22,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225189890] [2021-11-25 19:37:22,055 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:37:22,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:22,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:22,060 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:22,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 19:37:22,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-25 19:37:22,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:37:22,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-25 19:37:22,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:22,495 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:37:22,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:37:23,488 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 81 proven. 319 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:23,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:24,727 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 100 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:24,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225189890] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:24,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1377530233] [2021-11-25 19:37:24,729 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:24,729 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:24,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:24,729 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:24,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:24,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:24,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:24,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:24,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:24,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:24,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:24,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:24,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:25,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:25,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:25,093 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:25,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:25,568 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:28,027 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11184#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:28,027 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:28,027 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:28,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 71 [2021-11-25 19:37:28,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32120744] [2021-11-25 19:37:28,028 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:28,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-25 19:37:28,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:28,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-25 19:37:28,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=6065, Unknown=0, NotChecked=0, Total=6806 [2021-11-25 19:37:28,030 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 73 states, 72 states have (on average 3.75) internal successors, (270), 72 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:29,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:29,386 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2021-11-25 19:37:29,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 19:37:29,387 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 3.75) internal successors, (270), 72 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-25 19:37:29,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:29,388 INFO L225 Difference]: With dead ends: 105 [2021-11-25 19:37:29,388 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 19:37:29,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 200 SyntacticMatches, 10 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3574 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1759, Invalid=9161, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 19:37:29,389 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 890 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 890 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 1275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:29,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [890 Valid, 350 Invalid, 1275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1123 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:37:29,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 19:37:29,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2021-11-25 19:37:29,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 98 states have (on average 1.0408163265306123) internal successors, (102), 99 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:29,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2021-11-25 19:37:29,392 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 90 [2021-11-25 19:37:29,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:29,393 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2021-11-25 19:37:29,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 3.75) internal successors, (270), 72 states have internal predecessors, (270), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:29,393 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2021-11-25 19:37:29,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 19:37:29,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:29,394 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:29,414 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:29,594 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:29,595 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:29,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:29,595 INFO L85 PathProgramCache]: Analyzing trace with hash 1683755169, now seen corresponding path program 18 times [2021-11-25 19:37:29,595 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:29,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571139563] [2021-11-25 19:37:29,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:29,595 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:29,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:30,126 INFO L134 CoverageAnalysis]: Checked inductivity of 464 backedges. 53 proven. 410 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:30,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:30,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571139563] [2021-11-25 19:37:30,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571139563] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:30,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163050394] [2021-11-25 19:37:30,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:37:30,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:30,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:30,128 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:30,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 19:37:30,442 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:37:30,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:37:30,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 587 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-25 19:37:30,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:30,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:30,924 INFO L134 CoverageAnalysis]: Checked inductivity of 464 backedges. 53 proven. 410 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:30,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:31,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:37:31,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:37:31,256 INFO L134 CoverageAnalysis]: Checked inductivity of 464 backedges. 53 proven. 410 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:31,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163050394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:31,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1970409086] [2021-11-25 19:37:31,257 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:31,257 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:31,258 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:31,258 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:31,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:31,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:31,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:31,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:31,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:31,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:31,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:31,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:31,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:31,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:31,546 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:31,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:32,022 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:34,379 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12058#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:34,379 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:34,379 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:34,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 45 [2021-11-25 19:37:34,380 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203549799] [2021-11-25 19:37:34,380 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:34,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-25 19:37:34,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:34,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-25 19:37:34,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2789, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 19:37:34,381 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 45 states, 45 states have (on average 3.088888888888889) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:35,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:35,870 INFO L93 Difference]: Finished difference Result 169 states and 171 transitions. [2021-11-25 19:37:35,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 19:37:35,870 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.088888888888889) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-25 19:37:35,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:35,871 INFO L225 Difference]: With dead ends: 169 [2021-11-25 19:37:35,871 INFO L226 Difference]: Without dead ends: 103 [2021-11-25 19:37:35,872 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 246 SyntacticMatches, 14 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1617 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=426, Invalid=5894, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 19:37:35,872 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 203 mSDsluCounter, 755 mSDsCounter, 0 mSdLazyCounter, 2047 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 726 SdHoareTripleChecker+Invalid, 2159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 2047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:35,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 726 Invalid, 2159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 2047 Invalid, 0 Unknown, 54 Unchecked, 0.8s Time] [2021-11-25 19:37:35,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-25 19:37:35,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2021-11-25 19:37:35,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 100 states have (on average 1.04) internal successors, (104), 101 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:35,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2021-11-25 19:37:35,876 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 96 [2021-11-25 19:37:35,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:35,876 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2021-11-25 19:37:35,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.088888888888889) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:35,877 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2021-11-25 19:37:35,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-25 19:37:35,877 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:35,878 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:35,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:36,096 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-25 19:37:36,096 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:36,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:36,096 INFO L85 PathProgramCache]: Analyzing trace with hash -352605301, now seen corresponding path program 19 times [2021-11-25 19:37:36,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:36,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808816369] [2021-11-25 19:37:36,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:36,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:36,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:36,623 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 81 proven. 403 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:36,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:36,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808816369] [2021-11-25 19:37:36,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808816369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:36,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741952435] [2021-11-25 19:37:36,624 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:37:36,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:36,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:36,625 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:36,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 19:37:36,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:36,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-25 19:37:36,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:37,426 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 100 proven. 384 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:37,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:38,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:37:38,094 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 100 proven. 384 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:38,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741952435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:38,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918294186] [2021-11-25 19:37:38,096 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:38,096 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:38,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:38,097 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:38,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:38,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:38,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:38,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:38,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:38,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:38,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:38,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:38,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:38,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:38,394 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:38,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:38,864 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:40,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13025#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:40,969 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:40,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:40,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 53 [2021-11-25 19:37:40,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913085766] [2021-11-25 19:37:40,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:40,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-25 19:37:40,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:40,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-25 19:37:40,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=3601, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 19:37:40,971 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand has 54 states, 53 states have (on average 3.830188679245283) internal successors, (203), 54 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:41,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:41,898 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2021-11-25 19:37:41,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 19:37:41,898 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 3.830188679245283) internal successors, (203), 54 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-25 19:37:41,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:41,899 INFO L225 Difference]: With dead ends: 113 [2021-11-25 19:37:41,899 INFO L226 Difference]: Without dead ends: 111 [2021-11-25 19:37:41,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 242 SyntacticMatches, 13 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2433 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=914, Invalid=5092, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 19:37:41,900 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 788 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 1366 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 788 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 1504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 1366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:41,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [788 Valid, 425 Invalid, 1504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 1366 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:37:41,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-25 19:37:41,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 108. [2021-11-25 19:37:41,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 107 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:41,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2021-11-25 19:37:41,903 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 98 [2021-11-25 19:37:41,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:41,904 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2021-11-25 19:37:41,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 3.830188679245283) internal successors, (203), 54 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:41,904 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2021-11-25 19:37:41,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-25 19:37:41,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:41,905 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:41,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:42,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 19:37:42,116 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:42,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:42,116 INFO L85 PathProgramCache]: Analyzing trace with hash -696199509, now seen corresponding path program 20 times [2021-11-25 19:37:42,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:42,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436498594] [2021-11-25 19:37:42,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:42,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:42,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:42,674 INFO L134 CoverageAnalysis]: Checked inductivity of 554 backedges. 58 proven. 495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:42,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:42,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436498594] [2021-11-25 19:37:42,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436498594] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:42,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [229418203] [2021-11-25 19:37:42,675 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:37:42,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:42,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:42,676 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:42,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 19:37:43,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-25 19:37:43,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:37:43,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-25 19:37:43,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:43,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:43,687 INFO L134 CoverageAnalysis]: Checked inductivity of 554 backedges. 58 proven. 495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:43,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:43,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:37:43,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:37:44,017 INFO L134 CoverageAnalysis]: Checked inductivity of 554 backedges. 58 proven. 495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:44,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [229418203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:44,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010402275] [2021-11-25 19:37:44,018 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:44,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:44,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:44,018 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:44,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:44,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:44,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:44,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:44,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:44,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:44,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:44,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:44,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:44,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:44,329 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:44,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:44,729 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:46,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13950#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:46,057 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:46,057 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:46,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 48 [2021-11-25 19:37:46,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934386131] [2021-11-25 19:37:46,057 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:46,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 19:37:46,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:46,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 19:37:46,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=3117, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 19:37:46,060 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 48 states, 48 states have (on average 3.1041666666666665) internal successors, (149), 48 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:47,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:47,699 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2021-11-25 19:37:47,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 19:37:47,699 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.1041666666666665) internal successors, (149), 48 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-25 19:37:47,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:47,700 INFO L225 Difference]: With dead ends: 183 [2021-11-25 19:37:47,700 INFO L226 Difference]: Without dead ends: 111 [2021-11-25 19:37:47,700 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 280 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1526 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=453, Invalid=6687, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 19:37:47,701 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 218 mSDsluCounter, 840 mSDsCounter, 0 mSdLazyCounter, 2413 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 811 SdHoareTripleChecker+Invalid, 2475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 2413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:47,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 811 Invalid, 2475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 2413 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:37:47,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-25 19:37:47,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2021-11-25 19:37:47,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 108 states have (on average 1.037037037037037) internal successors, (112), 109 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:47,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2021-11-25 19:37:47,703 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 104 [2021-11-25 19:37:47,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:47,704 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2021-11-25 19:37:47,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 3.1041666666666665) internal successors, (149), 48 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:47,704 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2021-11-25 19:37:47,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-25 19:37:47,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:47,705 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:47,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:47,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:47,924 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:47,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:47,924 INFO L85 PathProgramCache]: Analyzing trace with hash -9181291, now seen corresponding path program 21 times [2021-11-25 19:37:47,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:47,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157320508] [2021-11-25 19:37:47,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:47,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:47,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:48,435 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 100 proven. 476 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:48,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:48,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157320508] [2021-11-25 19:37:48,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157320508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:48,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872115853] [2021-11-25 19:37:48,436 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:37:48,436 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:48,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:48,442 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:48,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 19:37:48,907 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:37:48,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:37:48,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-25 19:37:48,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:48,927 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:37:48,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:37:50,036 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 121 proven. 455 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:50,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:51,488 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 144 proven. 432 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:51,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872115853] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:51,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [223039415] [2021-11-25 19:37:51,490 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:51,490 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:51,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:51,490 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:51,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:51,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:51,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:51,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:51,835 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:51,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:52,286 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:37:55,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15021#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:37:55,096 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:37:55,096 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:37:55,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 82 [2021-11-25 19:37:55,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980850202] [2021-11-25 19:37:55,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:37:55,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-25 19:37:55,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:37:55,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-25 19:37:55,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=943, Invalid=7799, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 19:37:55,098 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand has 84 states, 83 states have (on average 3.8072289156626504) internal successors, (316), 83 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:56,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:37:56,100 INFO L93 Difference]: Finished difference Result 121 states and 123 transitions. [2021-11-25 19:37:56,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 19:37:56,102 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 3.8072289156626504) internal successors, (316), 83 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-25 19:37:56,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:37:56,103 INFO L225 Difference]: With dead ends: 121 [2021-11-25 19:37:56,103 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 19:37:56,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 238 SyntacticMatches, 13 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5263 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1734, Invalid=10038, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 19:37:56,104 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 533 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 1698 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 1802 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 1698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:37:56,105 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [533 Valid, 535 Invalid, 1802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 1698 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:37:56,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 19:37:56,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 116. [2021-11-25 19:37:56,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 114 states have (on average 1.0350877192982457) internal successors, (118), 115 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:56,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2021-11-25 19:37:56,108 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 106 [2021-11-25 19:37:56,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:37:56,108 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2021-11-25 19:37:56,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 83 states have (on average 3.8072289156626504) internal successors, (316), 83 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:37:56,109 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2021-11-25 19:37:56,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-25 19:37:56,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:37:56,110 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:37:56,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-25 19:37:56,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 19:37:56,324 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:37:56,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:37:56,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1210424523, now seen corresponding path program 22 times [2021-11-25 19:37:56,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:37:56,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989230386] [2021-11-25 19:37:56,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:37:56,325 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:37:56,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:56,968 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 63 proven. 588 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:56,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:37:56,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989230386] [2021-11-25 19:37:56,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989230386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:37:56,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909396829] [2021-11-25 19:37:56,968 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:37:56,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:37:56,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:37:56,976 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:37:56,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 19:37:57,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:37:57,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-25 19:37:57,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:37:57,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:57,791 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 63 proven. 588 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:57,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:37:57,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:37:57,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:37:58,129 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 63 proven. 588 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:37:58,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909396829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:37:58,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841389332] [2021-11-25 19:37:58,131 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:37:58,131 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:37:58,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:37:58,131 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:37:58,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:37:58,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:37:58,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:37:58,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:58,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:58,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:58,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:37:58,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:58,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:58,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:37:58,465 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:37:58,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:37:58,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:01,679 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16015#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:01,679 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:01,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:01,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 51 [2021-11-25 19:38:01,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609456610] [2021-11-25 19:38:01,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:01,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-25 19:38:01,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:01,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-25 19:38:01,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=3463, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 19:38:01,680 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand has 51 states, 51 states have (on average 3.1176470588235294) internal successors, (159), 51 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:03,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:03,669 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2021-11-25 19:38:03,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-25 19:38:03,670 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.1176470588235294) internal successors, (159), 51 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-25 19:38:03,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:03,671 INFO L225 Difference]: With dead ends: 197 [2021-11-25 19:38:03,671 INFO L226 Difference]: Without dead ends: 119 [2021-11-25 19:38:03,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 290 SyntacticMatches, 16 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=480, Invalid=7530, Unknown=0, NotChecked=0, Total=8010 [2021-11-25 19:38:03,672 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 230 mSDsluCounter, 1055 mSDsCounter, 0 mSdLazyCounter, 2907 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 1017 SdHoareTripleChecker+Invalid, 3037 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2907 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:03,672 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [230 Valid, 1017 Invalid, 3037 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2907 Invalid, 0 Unknown, 63 Unchecked, 1.1s Time] [2021-11-25 19:38:03,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-25 19:38:03,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2021-11-25 19:38:03,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 117 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:03,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-11-25 19:38:03,675 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 112 [2021-11-25 19:38:03,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:03,675 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-11-25 19:38:03,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 3.1176470588235294) internal successors, (159), 51 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:03,676 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-11-25 19:38:03,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-25 19:38:03,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:03,676 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:03,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:03,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 19:38:03,877 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:03,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:03,877 INFO L85 PathProgramCache]: Analyzing trace with hash 189458975, now seen corresponding path program 23 times [2021-11-25 19:38:03,877 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:03,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300781838] [2021-11-25 19:38:03,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:03,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:03,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:04,424 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 121 proven. 555 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:04,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:04,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300781838] [2021-11-25 19:38:04,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300781838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:04,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124289490] [2021-11-25 19:38:04,424 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:38:04,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:04,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:04,425 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:04,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 19:38:05,060 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-25 19:38:05,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:38:05,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 19:38:05,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:05,080 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:38:05,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:38:05,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:06,937 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:38:06,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 19:38:07,068 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 19:38:07,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:08,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 19:38:08,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 19:38:08,200 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 0 proven. 75 refuted. 0 times theorem prover too weak. 602 trivial. 0 not checked. [2021-11-25 19:38:08,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124289490] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:08,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [572257570] [2021-11-25 19:38:08,202 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-25 19:38:08,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:08,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:08,202 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:08,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:08,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:08,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:08,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:08,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:08,519 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:08,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:09,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:11,293 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17117#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:11,293 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:11,293 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:11,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 5, 5] total 39 [2021-11-25 19:38:11,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622323139] [2021-11-25 19:38:11,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:11,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 19:38:11,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:11,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 19:38:11,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=2231, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 19:38:11,295 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 41 states, 40 states have (on average 3.95) internal successors, (158), 40 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:11,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:11,876 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-11-25 19:38:11,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 19:38:11,877 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 3.95) internal successors, (158), 40 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-25 19:38:11,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:11,878 INFO L225 Difference]: With dead ends: 125 [2021-11-25 19:38:11,878 INFO L226 Difference]: Without dead ends: 125 [2021-11-25 19:38:11,878 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 346 SyntacticMatches, 13 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=578, Invalid=4252, Unknown=0, NotChecked=0, Total=4830 [2021-11-25 19:38:11,878 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 76 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 460 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:11,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 460 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 345 Invalid, 0 Unknown, 81 Unchecked, 0.2s Time] [2021-11-25 19:38:11,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-11-25 19:38:11,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 116. [2021-11-25 19:38:11,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 115 states have (on average 1.0260869565217392) internal successors, (118), 115 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:11,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2021-11-25 19:38:11,882 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 114 [2021-11-25 19:38:11,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:11,882 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2021-11-25 19:38:11,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 3.95) internal successors, (158), 40 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:11,883 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2021-11-25 19:38:11,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 19:38:11,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:11,884 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:11,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:12,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:12,092 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:12,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:12,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1578267011, now seen corresponding path program 1 times [2021-11-25 19:38:12,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:12,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985810595] [2021-11-25 19:38:12,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:12,093 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:12,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:12,640 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 121 proven. 555 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:12,640 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:12,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985810595] [2021-11-25 19:38:12,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985810595] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:12,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596134025] [2021-11-25 19:38:12,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:12,641 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:12,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:12,641 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:12,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 19:38:12,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:12,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 689 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-25 19:38:12,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:13,466 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 144 proven. 532 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:13,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:14,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:38:14,266 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 144 proven. 532 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:14,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596134025] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:14,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [552420628] [2021-11-25 19:38:14,268 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:38:14,268 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:14,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:14,268 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:14,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:14,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:14,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:14,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:14,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:14,661 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:14,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:15,313 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:16,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18191#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:16,399 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:16,399 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:16,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 61 [2021-11-25 19:38:16,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426382406] [2021-11-25 19:38:16,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:16,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-25 19:38:16,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:16,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-25 19:38:16,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=4430, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 19:38:16,401 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand has 62 states, 61 states have (on average 3.8852459016393444) internal successors, (237), 62 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:17,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:17,475 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2021-11-25 19:38:17,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-25 19:38:17,475 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 3.8852459016393444) internal successors, (237), 62 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 115 [2021-11-25 19:38:17,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:17,477 INFO L225 Difference]: With dead ends: 128 [2021-11-25 19:38:17,477 INFO L226 Difference]: Without dead ends: 126 [2021-11-25 19:38:17,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 301 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1172, Invalid=6310, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 19:38:17,478 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 899 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 1735 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 899 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 1900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 1735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:17,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [899 Valid, 549 Invalid, 1900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 1735 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:38:17,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-25 19:38:17,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 122. [2021-11-25 19:38:17,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.024793388429752) internal successors, (124), 121 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:17,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2021-11-25 19:38:17,482 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 115 [2021-11-25 19:38:17,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:17,482 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2021-11-25 19:38:17,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 61 states have (on average 3.8852459016393444) internal successors, (237), 62 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:17,483 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2021-11-25 19:38:17,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 19:38:17,484 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:17,484 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:17,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:17,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:17,700 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:17,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:17,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1232537955, now seen corresponding path program 2 times [2021-11-25 19:38:17,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:17,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213926133] [2021-11-25 19:38:17,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:17,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:17,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:18,593 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 14 proven. 743 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:18,593 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:18,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213926133] [2021-11-25 19:38:18,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213926133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:18,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410641134] [2021-11-25 19:38:18,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:38:18,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:18,594 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:18,596 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:18,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 19:38:19,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-25 19:38:19,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:38:19,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 720 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-25 19:38:19,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:19,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:20,035 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 14 proven. 743 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:20,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:21,662 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:38:21,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 127 [2021-11-25 19:38:21,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 19:38:21,875 INFO L354 Elim1Store]: treesize reduction 31, result has 20.5 percent of original size [2021-11-25 19:38:21,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 57 [2021-11-25 19:38:22,183 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 14 proven. 743 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:22,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410641134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:22,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311196244] [2021-11-25 19:38:22,184 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:38:22,184 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:22,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:22,185 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:22,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:22,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:22,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:22,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:22,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:22,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:22,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:22,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:22,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:22,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:22,538 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:22,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:23,288 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:24,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19280#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:24,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:24,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:24,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 78 [2021-11-25 19:38:24,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43825670] [2021-11-25 19:38:24,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:24,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-25 19:38:24,712 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:24,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-25 19:38:24,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=7191, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 19:38:24,714 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand has 78 states, 78 states have (on average 3.269230769230769) internal successors, (255), 78 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:27,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:27,988 INFO L93 Difference]: Finished difference Result 213 states and 216 transitions. [2021-11-25 19:38:27,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-25 19:38:27,988 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 3.269230769230769) internal successors, (255), 78 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-25 19:38:27,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:27,989 INFO L225 Difference]: With dead ends: 213 [2021-11-25 19:38:27,989 INFO L226 Difference]: Without dead ends: 213 [2021-11-25 19:38:27,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 311 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4153 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=914, Invalid=17446, Unknown=0, NotChecked=0, Total=18360 [2021-11-25 19:38:27,990 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 217 mSDsluCounter, 1391 mSDsCounter, 0 mSdLazyCounter, 2796 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 1335 SdHoareTripleChecker+Invalid, 4283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 2796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1364 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:27,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 1335 Invalid, 4283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 2796 Invalid, 0 Unknown, 1364 Unchecked, 1.1s Time] [2021-11-25 19:38:27,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-25 19:38:27,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 132. [2021-11-25 19:38:27,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 131 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:27,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 135 transitions. [2021-11-25 19:38:27,994 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 135 transitions. Word has length 121 [2021-11-25 19:38:27,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:27,994 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 135 transitions. [2021-11-25 19:38:27,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 3.269230769230769) internal successors, (255), 78 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:27,995 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 135 transitions. [2021-11-25 19:38:27,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-25 19:38:27,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:27,995 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:28,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:28,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:28,204 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:28,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:28,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1872844359, now seen corresponding path program 3 times [2021-11-25 19:38:28,204 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:28,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429787100] [2021-11-25 19:38:28,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:28,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:28,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:28,845 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 144 proven. 640 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:28,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:28,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429787100] [2021-11-25 19:38:28,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1429787100] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:28,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006716686] [2021-11-25 19:38:28,845 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:38:28,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:28,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:28,846 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:28,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 19:38:29,292 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:38:29,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:38:29,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-25 19:38:29,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:29,327 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:38:29,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:38:30,712 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 169 proven. 615 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:30,712 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:32,510 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 196 proven. 588 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:32,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006716686] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:32,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [827294285] [2021-11-25 19:38:32,512 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:38:32,512 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:32,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:32,512 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:32,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:32,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:32,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:32,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:32,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:32,822 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:32,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:33,451 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:34,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20561#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:34,770 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:34,771 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:34,771 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 94 [2021-11-25 19:38:34,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002480244] [2021-11-25 19:38:34,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:34,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-25 19:38:34,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:34,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-25 19:38:34,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1193, Invalid=9727, Unknown=0, NotChecked=0, Total=10920 [2021-11-25 19:38:34,774 INFO L87 Difference]: Start difference. First operand 132 states and 135 transitions. Second operand has 96 states, 95 states have (on average 3.863157894736842) internal successors, (367), 95 states have internal predecessors, (367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:36,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:36,217 INFO L93 Difference]: Finished difference Result 233 states and 236 transitions. [2021-11-25 19:38:36,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 19:38:36,218 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 3.863157894736842) internal successors, (367), 95 states have internal predecessors, (367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-25 19:38:36,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:36,219 INFO L225 Difference]: With dead ends: 233 [2021-11-25 19:38:36,219 INFO L226 Difference]: Without dead ends: 231 [2021-11-25 19:38:36,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5352 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2272, Invalid=12734, Unknown=0, NotChecked=0, Total=15006 [2021-11-25 19:38:36,220 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 203 mSDsluCounter, 854 mSDsCounter, 0 mSdLazyCounter, 2611 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 870 SdHoareTripleChecker+Invalid, 2653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 2611 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:36,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 870 Invalid, 2653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 2611 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:38:36,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-25 19:38:36,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 128. [2021-11-25 19:38:36,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.0236220472440944) internal successors, (130), 127 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:36,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 130 transitions. [2021-11-25 19:38:36,225 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 130 transitions. Word has length 123 [2021-11-25 19:38:36,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:36,225 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 130 transitions. [2021-11-25 19:38:36,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 3.863157894736842) internal successors, (367), 95 states have internal predecessors, (367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:36,226 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 130 transitions. [2021-11-25 19:38:36,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-25 19:38:36,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:36,226 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:36,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:36,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-25 19:38:36,432 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:36,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:36,432 INFO L85 PathProgramCache]: Analyzing trace with hash 809646403, now seen corresponding path program 4 times [2021-11-25 19:38:36,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:36,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375526569] [2021-11-25 19:38:36,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:36,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:36,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:36,969 INFO L134 CoverageAnalysis]: Checked inductivity of 845 backedges. 593 proven. 250 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:38:36,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:36,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375526569] [2021-11-25 19:38:36,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375526569] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:36,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514387812] [2021-11-25 19:38:36,969 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:38:36,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:36,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:36,970 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:36,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 19:38:37,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:37,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-25 19:38:37,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:37,217 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:38:37,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:38:38,289 INFO L134 CoverageAnalysis]: Checked inductivity of 845 backedges. 674 proven. 169 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:38:38,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:39,012 INFO L134 CoverageAnalysis]: Checked inductivity of 845 backedges. 632 proven. 211 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:38:39,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1514387812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:39,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [962808954] [2021-11-25 19:38:39,013 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:38:39,013 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:39,014 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:39,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:39,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:39,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:39,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:39,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:39,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:39,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:39,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:39,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:39,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:39,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:39,360 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:39,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:40,155 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:41,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21804#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:41,085 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:41,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:41,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 80 [2021-11-25 19:38:41,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168188798] [2021-11-25 19:38:41,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:41,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2021-11-25 19:38:41,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:41,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-11-25 19:38:41,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1251, Invalid=6759, Unknown=0, NotChecked=0, Total=8010 [2021-11-25 19:38:41,087 INFO L87 Difference]: Start difference. First operand 128 states and 130 transitions. Second operand has 81 states, 81 states have (on average 3.4814814814814814) internal successors, (282), 80 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:41,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:41,883 INFO L93 Difference]: Finished difference Result 220 states and 222 transitions. [2021-11-25 19:38:41,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 19:38:41,884 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 3.4814814814814814) internal successors, (282), 80 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2021-11-25 19:38:41,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:41,885 INFO L225 Difference]: With dead ends: 220 [2021-11-25 19:38:41,885 INFO L226 Difference]: Without dead ends: 131 [2021-11-25 19:38:41,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 322 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4942 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2018, Invalid=9324, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 19:38:41,886 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 159 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 802 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 802 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:41,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 362 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 802 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:38:41,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-25 19:38:41,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2021-11-25 19:38:41,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0232558139534884) internal successors, (132), 129 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:41,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 132 transitions. [2021-11-25 19:38:41,890 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 132 transitions. Word has length 127 [2021-11-25 19:38:41,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:41,890 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 132 transitions. [2021-11-25 19:38:41,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 3.4814814814814814) internal successors, (282), 80 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:41,890 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 132 transitions. [2021-11-25 19:38:41,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 19:38:41,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:41,891 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:41,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:42,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-25 19:38:42,108 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:42,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:42,108 INFO L85 PathProgramCache]: Analyzing trace with hash 407486745, now seen corresponding path program 5 times [2021-11-25 19:38:42,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:42,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073616833] [2021-11-25 19:38:42,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:42,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:42,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:42,972 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 15 proven. 856 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:42,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:42,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073616833] [2021-11-25 19:38:42,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073616833] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:42,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871402047] [2021-11-25 19:38:42,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:38:42,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:42,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:42,982 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:43,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 19:38:43,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-25 19:38:43,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:38:43,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 764 conjuncts, 109 conjunts are in the unsatisfiable core [2021-11-25 19:38:43,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:44,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:44,532 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 73 proven. 798 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:44,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:44,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:38:44,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:38:44,935 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 73 proven. 798 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:44,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871402047] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:44,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [278907776] [2021-11-25 19:38:44,936 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:38:44,936 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:44,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:44,937 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:44,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:44,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:44,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:44,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:45,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:45,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:45,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:38:45,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:45,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:45,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:45,225 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:45,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:45,933 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:47,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23027#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:47,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:47,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:47,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 35, 35] total 62 [2021-11-25 19:38:47,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55751011] [2021-11-25 19:38:47,246 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:47,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-25 19:38:47,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:47,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-25 19:38:47,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=4749, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 19:38:47,248 INFO L87 Difference]: Start difference. First operand 130 states and 132 transitions. Second operand has 62 states, 62 states have (on average 3.032258064516129) internal successors, (188), 62 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:50,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:38:50,389 INFO L93 Difference]: Finished difference Result 223 states and 225 transitions. [2021-11-25 19:38:50,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-25 19:38:50,389 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 3.032258064516129) internal successors, (188), 62 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 129 [2021-11-25 19:38:50,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:38:50,390 INFO L225 Difference]: With dead ends: 223 [2021-11-25 19:38:50,390 INFO L226 Difference]: Without dead ends: 133 [2021-11-25 19:38:50,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 352 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3071 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=796, Invalid=13724, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 19:38:50,392 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 281 mSDsluCounter, 1240 mSDsCounter, 0 mSdLazyCounter, 3898 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 1194 SdHoareTripleChecker+Invalid, 4139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 3898 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:38:50,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 1194 Invalid, 4139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 3898 Invalid, 0 Unknown, 82 Unchecked, 1.4s Time] [2021-11-25 19:38:50,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-25 19:38:50,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2021-11-25 19:38:50,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:50,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2021-11-25 19:38:50,399 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 129 [2021-11-25 19:38:50,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:38:50,399 INFO L470 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2021-11-25 19:38:50,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 3.032258064516129) internal successors, (188), 62 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:38:50,400 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2021-11-25 19:38:50,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-25 19:38:50,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:38:50,401 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:38:50,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 19:38:50,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:50,624 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:38:50,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:38:50,624 INFO L85 PathProgramCache]: Analyzing trace with hash 479112047, now seen corresponding path program 6 times [2021-11-25 19:38:50,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:38:50,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544345804] [2021-11-25 19:38:50,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:38:50,625 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:38:50,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:38:51,322 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 169 proven. 731 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:51,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:38:51,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544345804] [2021-11-25 19:38:51,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544345804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:38:51,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546345582] [2021-11-25 19:38:51,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:38:51,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:38:51,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:38:51,323 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:38:51,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 19:38:51,875 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:38:51,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:38:51,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 777 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-25 19:38:51,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:38:51,910 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:38:51,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:38:53,630 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 196 proven. 704 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:53,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:38:55,738 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 225 proven. 675 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:38:55,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [546345582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:38:55,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966487089] [2021-11-25 19:38:55,739 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:38:55,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:38:55,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:38:55,740 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:38:55,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:38:55,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:38:55,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:38:55,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:55,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:55,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:55,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:55,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:55,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:56,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:56,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:38:56,118 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:38:56,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:38:56,739 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:38:58,248 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24371#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:38:58,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:38:58,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:38:58,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 98 [2021-11-25 19:38:58,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879866179] [2021-11-25 19:38:58,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:38:58,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-25 19:38:58,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:38:58,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-25 19:38:58,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1165, Invalid=10607, Unknown=0, NotChecked=0, Total=11772 [2021-11-25 19:38:58,251 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 100 states, 99 states have (on average 3.919191919191919) internal successors, (388), 99 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:00,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:00,001 INFO L93 Difference]: Finished difference Result 144 states and 146 transitions. [2021-11-25 19:39:00,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 19:39:00,002 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 3.919191919191919) internal successors, (388), 99 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2021-11-25 19:39:00,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:00,003 INFO L225 Difference]: With dead ends: 144 [2021-11-25 19:39:00,003 INFO L226 Difference]: Without dead ends: 142 [2021-11-25 19:39:00,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 316 SyntacticMatches, 1 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4574 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=2310, Invalid=13946, Unknown=0, NotChecked=0, Total=16256 [2021-11-25 19:39:00,005 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 812 mSDsluCounter, 812 mSDsCounter, 0 mSdLazyCounter, 2527 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 812 SdHoareTripleChecker+Valid, 827 SdHoareTripleChecker+Invalid, 2684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 2527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:00,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [812 Valid, 827 Invalid, 2684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 2527 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:39:00,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-25 19:39:00,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2021-11-25 19:39:00,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0218978102189782) internal successors, (140), 137 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:00,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 140 transitions. [2021-11-25 19:39:00,009 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 140 transitions. Word has length 131 [2021-11-25 19:39:00,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:00,010 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 140 transitions. [2021-11-25 19:39:00,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 99 states have (on average 3.919191919191919) internal successors, (388), 99 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:00,010 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 140 transitions. [2021-11-25 19:39:00,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:39:00,011 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:00,011 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:00,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:00,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-25 19:39:00,228 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:39:00,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:00,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1113793103, now seen corresponding path program 7 times [2021-11-25 19:39:00,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:00,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771373618] [2021-11-25 19:39:00,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:00,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:00,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:01,226 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 16 proven. 977 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:01,227 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:01,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771373618] [2021-11-25 19:39:01,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771373618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:01,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173652972] [2021-11-25 19:39:01,227 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:39:01,227 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:01,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:01,228 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:01,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 19:39:01,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:01,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 808 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-25 19:39:01,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:01,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:05,044 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:39:05,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 19:39:05,290 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 196 proven. 797 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:05,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:07,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:39:07,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:39:07,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 27 [2021-11-25 19:39:07,296 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 196 proven. 797 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:07,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173652972] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:07,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731354634] [2021-11-25 19:39:07,297 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:39:07,297 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:07,297 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:07,298 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:07,298 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:07,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:07,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:39:07,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:07,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:07,612 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:39:07,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:39:08,291 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:10,024 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25614#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:39:10,025 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:10,025 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:10,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 37, 37] total 98 [2021-11-25 19:39:10,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710149090] [2021-11-25 19:39:10,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:10,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-25 19:39:10,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:10,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-25 19:39:10,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=10635, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 19:39:10,027 INFO L87 Difference]: Start difference. First operand 138 states and 140 transitions. Second operand has 98 states, 98 states have (on average 3.826530612244898) internal successors, (375), 98 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:13,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:13,074 INFO L93 Difference]: Finished difference Result 257 states and 260 transitions. [2021-11-25 19:39:13,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-25 19:39:13,074 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.826530612244898) internal successors, (375), 98 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 137 [2021-11-25 19:39:13,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:13,075 INFO L225 Difference]: With dead ends: 257 [2021-11-25 19:39:13,075 INFO L226 Difference]: Without dead ends: 255 [2021-11-25 19:39:13,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 386 SyntacticMatches, 4 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5648 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1216, Invalid=18244, Unknown=0, NotChecked=0, Total=19460 [2021-11-25 19:39:13,077 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 251 mSDsluCounter, 1340 mSDsCounter, 0 mSdLazyCounter, 2005 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 1317 SdHoareTripleChecker+Invalid, 2430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 2005 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 359 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:13,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 1317 Invalid, 2430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 2005 Invalid, 0 Unknown, 359 Unchecked, 0.8s Time] [2021-11-25 19:39:13,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-25 19:39:13,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 144. [2021-11-25 19:39:13,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:13,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 146 transitions. [2021-11-25 19:39:13,082 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 146 transitions. Word has length 137 [2021-11-25 19:39:13,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:13,082 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 146 transitions. [2021-11-25 19:39:13,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.826530612244898) internal successors, (375), 98 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:13,083 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 146 transitions. [2021-11-25 19:39:13,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:39:13,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:13,084 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:13,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:13,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-25 19:39:13,296 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:39:13,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:13,296 INFO L85 PathProgramCache]: Analyzing trace with hash 570093871, now seen corresponding path program 8 times [2021-11-25 19:39:13,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:13,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006261179] [2021-11-25 19:39:13,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:13,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:13,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:14,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1093 backedges. 172 proven. 915 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:39:14,150 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:14,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006261179] [2021-11-25 19:39:14,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006261179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:14,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503276247] [2021-11-25 19:39:14,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:39:14,151 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:14,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:14,152 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:14,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 19:39:14,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-25 19:39:14,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:14,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-25 19:39:14,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:14,886 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:39:14,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:39:16,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1093 backedges. 866 proven. 225 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:16,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:18,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1093 backedges. 866 proven. 225 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:18,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503276247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:18,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466479958] [2021-11-25 19:39:18,425 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:39:18,425 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:18,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:18,425 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:18,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:18,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:39:18,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:18,780 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:39:18,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:39:19,413 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:20,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27095#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:39:20,873 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:20,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:20,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 107 [2021-11-25 19:39:20,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815252219] [2021-11-25 19:39:20,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:20,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-25 19:39:20,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:20,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-25 19:39:20,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1163, Invalid=12409, Unknown=0, NotChecked=0, Total=13572 [2021-11-25 19:39:20,875 INFO L87 Difference]: Start difference. First operand 144 states and 146 transitions. Second operand has 108 states, 108 states have (on average 3.814814814814815) internal successors, (412), 107 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:24,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:24,387 INFO L93 Difference]: Finished difference Result 243 states and 245 transitions. [2021-11-25 19:39:24,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 19:39:24,388 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 3.814814814814815) internal successors, (412), 107 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-25 19:39:24,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:24,389 INFO L225 Difference]: With dead ends: 243 [2021-11-25 19:39:24,389 INFO L226 Difference]: Without dead ends: 147 [2021-11-25 19:39:24,390 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6771 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=2461, Invalid=21409, Unknown=0, NotChecked=0, Total=23870 [2021-11-25 19:39:24,391 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 743 mSDsluCounter, 1429 mSDsCounter, 0 mSdLazyCounter, 4411 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 743 SdHoareTripleChecker+Valid, 1421 SdHoareTripleChecker+Invalid, 4626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 4411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:24,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [743 Valid, 1421 Invalid, 4626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 4411 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-25 19:39:24,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-25 19:39:24,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2021-11-25 19:39:24,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 145 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:24,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 148 transitions. [2021-11-25 19:39:24,395 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 148 transitions. Word has length 143 [2021-11-25 19:39:24,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:24,395 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 148 transitions. [2021-11-25 19:39:24,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 3.814814814814815) internal successors, (412), 107 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:24,396 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 148 transitions. [2021-11-25 19:39:24,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 19:39:24,396 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:24,397 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:24,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:24,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:24,620 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:39:24,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:24,620 INFO L85 PathProgramCache]: Analyzing trace with hash 504630533, now seen corresponding path program 9 times [2021-11-25 19:39:24,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:24,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015575920] [2021-11-25 19:39:24,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:24,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:24,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:25,619 INFO L134 CoverageAnalysis]: Checked inductivity of 1124 backedges. 17 proven. 1106 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:25,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:25,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015575920] [2021-11-25 19:39:25,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015575920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:25,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335424816] [2021-11-25 19:39:25,620 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:39:25,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:25,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:25,620 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:25,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 19:39:26,355 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:39:26,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:26,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 852 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-25 19:39:26,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:26,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:27,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1124 backedges. 17 proven. 1106 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:27,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:29,602 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:39:29,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 127 [2021-11-25 19:39:29,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 19:39:29,811 INFO L354 Elim1Store]: treesize reduction 31, result has 20.5 percent of original size [2021-11-25 19:39:29,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 57 [2021-11-25 19:39:30,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1124 backedges. 17 proven. 1106 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:30,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335424816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:30,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1723823855] [2021-11-25 19:39:30,105 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:39:30,105 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:30,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:30,105 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:30,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:30,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:30,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:39:30,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:30,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:30,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:30,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:30,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:30,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:30,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:30,406 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:39:30,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:39:31,264 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:32,886 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28523#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:39:32,886 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:32,886 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:32,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 90 [2021-11-25 19:39:32,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423503589] [2021-11-25 19:39:32,886 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:32,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-25 19:39:32,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:32,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-25 19:39:32,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=9378, Unknown=0, NotChecked=0, Total=9702 [2021-11-25 19:39:32,888 INFO L87 Difference]: Start difference. First operand 146 states and 148 transitions. Second operand has 90 states, 90 states have (on average 3.3666666666666667) internal successors, (303), 90 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:37,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:37,504 INFO L93 Difference]: Finished difference Result 256 states and 259 transitions. [2021-11-25 19:39:37,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-25 19:39:37,505 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 3.3666666666666667) internal successors, (303), 90 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-11-25 19:39:37,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:37,506 INFO L225 Difference]: With dead ends: 256 [2021-11-25 19:39:37,507 INFO L226 Difference]: Without dead ends: 256 [2021-11-25 19:39:37,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 536 GetRequests, 377 SyntacticMatches, 3 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5500 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=1072, Invalid=23734, Unknown=0, NotChecked=0, Total=24806 [2021-11-25 19:39:37,509 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 260 mSDsluCounter, 2073 mSDsCounter, 0 mSdLazyCounter, 4537 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 1986 SdHoareTripleChecker+Invalid, 6176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 4537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1494 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:37,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 1986 Invalid, 6176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 4537 Invalid, 0 Unknown, 1494 Unchecked, 1.7s Time] [2021-11-25 19:39:37,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-25 19:39:37,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 156. [2021-11-25 19:39:37,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0258064516129033) internal successors, (159), 155 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:37,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 159 transitions. [2021-11-25 19:39:37,514 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 159 transitions. Word has length 145 [2021-11-25 19:39:37,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:37,514 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 159 transitions. [2021-11-25 19:39:37,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 3.3666666666666667) internal successors, (303), 90 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:37,515 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 159 transitions. [2021-11-25 19:39:37,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-25 19:39:37,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:37,516 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:37,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:37,736 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-25 19:39:37,736 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:39:37,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:37,737 INFO L85 PathProgramCache]: Analyzing trace with hash 2018872155, now seen corresponding path program 10 times [2021-11-25 19:39:37,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:37,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700141622] [2021-11-25 19:39:37,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:37,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:37,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:38,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 225 proven. 931 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:38,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:38,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700141622] [2021-11-25 19:39:38,681 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700141622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:38,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035350361] [2021-11-25 19:39:38,681 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:39:38,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:38,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:38,682 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:38,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 19:39:38,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:38,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 865 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-25 19:39:38,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:39,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 256 proven. 900 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:39,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:40,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:39:41,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 256 proven. 900 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:41,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035350361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:41,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [730795325] [2021-11-25 19:39:41,022 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:39:41,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:41,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:41,023 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:41,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:41,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:41,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:39:41,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:41,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:41,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:41,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:41,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:41,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:41,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:41,301 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:39:41,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:39:41,934 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:43,137 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30017#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:39:43,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:43,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:43,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 77 [2021-11-25 19:39:43,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428037747] [2021-11-25 19:39:43,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:43,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2021-11-25 19:39:43,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:43,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-11-25 19:39:43,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=6662, Unknown=0, NotChecked=0, Total=7482 [2021-11-25 19:39:43,139 INFO L87 Difference]: Start difference. First operand 156 states and 159 transitions. Second operand has 78 states, 77 states have (on average 3.909090909090909) internal successors, (301), 78 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:44,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:44,865 INFO L93 Difference]: Finished difference Result 275 states and 278 transitions. [2021-11-25 19:39:44,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-25 19:39:44,866 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 3.909090909090909) internal successors, (301), 78 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 147 [2021-11-25 19:39:44,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:44,867 INFO L225 Difference]: With dead ends: 275 [2021-11-25 19:39:44,867 INFO L226 Difference]: Without dead ends: 273 [2021-11-25 19:39:44,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 389 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3401 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=1866, Invalid=9690, Unknown=0, NotChecked=0, Total=11556 [2021-11-25 19:39:44,868 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 350 mSDsluCounter, 902 mSDsCounter, 0 mSdLazyCounter, 2973 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 3042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:44,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 919 Invalid, 3042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2973 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:39:44,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-11-25 19:39:44,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 152. [2021-11-25 19:39:44,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0198675496688743) internal successors, (154), 151 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:44,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2021-11-25 19:39:44,873 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 147 [2021-11-25 19:39:44,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:44,873 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2021-11-25 19:39:44,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 77 states have (on average 3.909090909090909) internal successors, (301), 78 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:44,874 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2021-11-25 19:39:44,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-25 19:39:44,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:44,875 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:44,895 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:45,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:45,075 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:39:45,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:45,076 INFO L85 PathProgramCache]: Analyzing trace with hash -2021491867, now seen corresponding path program 11 times [2021-11-25 19:39:45,076 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:45,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830916720] [2021-11-25 19:39:45,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:45,076 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:45,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:46,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1229 backedges. 183 proven. 1040 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:39:46,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:46,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830916720] [2021-11-25 19:39:46,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [830916720] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:46,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922370590] [2021-11-25 19:39:46,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:39:46,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:46,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:46,088 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:46,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 19:39:47,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-25 19:39:47,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:47,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-25 19:39:47,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:47,514 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:39:47,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:39:49,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1229 backedges. 972 proven. 256 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:49,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:51,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1229 backedges. 972 proven. 256 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:51,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922370590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:51,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [578246107] [2021-11-25 19:39:51,436 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:39:51,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:51,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:51,437 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:51,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:51,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:51,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:39:51,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:51,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:51,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:51,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:39:51,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:51,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:51,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:39:51,750 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:39:51,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:39:52,370 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:53,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31509#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:39:53,876 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:53,876 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:53,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 113 [2021-11-25 19:39:53,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227336918] [2021-11-25 19:39:53,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:53,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2021-11-25 19:39:53,878 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:53,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-11-25 19:39:53,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1282, Invalid=13724, Unknown=0, NotChecked=0, Total=15006 [2021-11-25 19:39:53,879 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 114 states, 114 states have (on average 3.8771929824561404) internal successors, (442), 113 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:57,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:57,715 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2021-11-25 19:39:57,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 19:39:57,716 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 3.8771929824561404) internal successors, (442), 113 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-25 19:39:57,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:57,718 INFO L225 Difference]: With dead ends: 257 [2021-11-25 19:39:57,718 INFO L226 Difference]: Without dead ends: 155 [2021-11-25 19:39:57,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 369 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7502 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=2708, Invalid=23698, Unknown=0, NotChecked=0, Total=26406 [2021-11-25 19:39:57,720 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 632 mSDsluCounter, 1497 mSDsCounter, 0 mSdLazyCounter, 4768 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 632 SdHoareTripleChecker+Valid, 1488 SdHoareTripleChecker+Invalid, 4963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 4768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:57,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [632 Valid, 1488 Invalid, 4963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 4768 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 19:39:57,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-25 19:39:57,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-11-25 19:39:57,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 153 states have (on average 1.0196078431372548) internal successors, (156), 153 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:57,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 156 transitions. [2021-11-25 19:39:57,723 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 156 transitions. Word has length 151 [2021-11-25 19:39:57,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:57,724 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 156 transitions. [2021-11-25 19:39:57,724 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 3.8771929824561404) internal successors, (442), 113 states have internal predecessors, (442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:57,724 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 156 transitions. [2021-11-25 19:39:57,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-25 19:39:57,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:57,725 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:57,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:57,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:57,940 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:39:57,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:57,941 INFO L85 PathProgramCache]: Analyzing trace with hash -2088410821, now seen corresponding path program 12 times [2021-11-25 19:39:57,941 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:57,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566021669] [2021-11-25 19:39:57,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:57,941 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:58,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:59,085 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 18 proven. 1243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:59,085 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:59,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566021669] [2021-11-25 19:39:59,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566021669] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:59,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016838803] [2021-11-25 19:39:59,085 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:39:59,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:59,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:59,086 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:59,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 19:40:00,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:40:00,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:40:00,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 896 conjuncts, 94 conjunts are in the unsatisfiable core [2021-11-25 19:40:00,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:00,055 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:40:00,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:40:01,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:03,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:41:03,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 17 [2021-11-25 19:41:03,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 925 proven. 306 refuted. 30 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:03,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:05,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 19:41:05,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 19:41:08,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 904 proven. 357 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:08,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016838803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:08,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1258994605] [2021-11-25 19:41:08,173 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:41:08,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:08,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:08,173 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:08,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:08,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:08,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:41:08,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:08,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:08,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:08,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:08,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:08,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:08,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:08,490 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:41:08,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:41:09,239 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:11,089 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33044#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:41:11,089 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:11,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:11,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 40, 40] total 122 [2021-11-25 19:41:11,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721452638] [2021-11-25 19:41:11,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:11,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2021-11-25 19:41:11,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:11,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2021-11-25 19:41:11,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1341, Invalid=15946, Unknown=5, NotChecked=0, Total=17292 [2021-11-25 19:41:11,094 INFO L87 Difference]: Start difference. First operand 154 states and 156 transitions. Second operand has 123 states, 123 states have (on average 3.658536585365854) internal successors, (450), 122 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:17,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:17,062 INFO L93 Difference]: Finished difference Result 265 states and 267 transitions. [2021-11-25 19:41:17,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 19:41:17,063 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 3.658536585365854) internal successors, (450), 122 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 153 [2021-11-25 19:41:17,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:17,064 INFO L225 Difference]: With dead ends: 265 [2021-11-25 19:41:17,064 INFO L226 Difference]: Without dead ends: 157 [2021-11-25 19:41:17,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 388 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9887 ImplicationChecksByTransitivity, 71.6s TimeCoverageRelationStatistics Valid=2439, Invalid=28356, Unknown=5, NotChecked=0, Total=30800 [2021-11-25 19:41:17,068 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 100 mSDsluCounter, 1714 mSDsCounter, 0 mSdLazyCounter, 2000 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 1703 SdHoareTripleChecker+Invalid, 2225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 2000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 159 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:17,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 1703 Invalid, 2225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 2000 Invalid, 0 Unknown, 159 Unchecked, 0.8s Time] [2021-11-25 19:41:17,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-25 19:41:17,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2021-11-25 19:41:17,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.0193548387096774) internal successors, (158), 155 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:17,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 158 transitions. [2021-11-25 19:41:17,071 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 158 transitions. Word has length 153 [2021-11-25 19:41:17,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:17,072 INFO L470 AbstractCegarLoop]: Abstraction has 156 states and 158 transitions. [2021-11-25 19:41:17,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 3.658536585365854) internal successors, (450), 122 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:17,072 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 158 transitions. [2021-11-25 19:41:17,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-11-25 19:41:17,073 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:17,073 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:17,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:17,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:17,296 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:41:17,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:17,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1973016175, now seen corresponding path program 13 times [2021-11-25 19:41:17,296 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:17,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915951739] [2021-11-25 19:41:17,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:17,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:17,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:18,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 256 proven. 1040 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:18,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:18,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915951739] [2021-11-25 19:41:18,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915951739] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:18,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116287132] [2021-11-25 19:41:18,407 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:41:18,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:18,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:18,408 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:18,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 19:41:18,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:18,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 909 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 19:41:18,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:19,801 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 289 proven. 1007 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:19,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:20,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:41:21,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 289 proven. 1007 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:21,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116287132] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:21,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [962956179] [2021-11-25 19:41:21,096 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:41:21,096 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:21,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:21,097 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:21,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:21,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:21,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:41:21,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:21,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:21,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:21,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:21,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:21,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:21,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:21,430 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:41:21,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:41:22,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:23,423 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34584#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:41:23,423 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:23,423 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:23,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 40, 40] total 81 [2021-11-25 19:41:23,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559137548] [2021-11-25 19:41:23,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:23,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-25 19:41:23,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:23,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-25 19:41:23,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=900, Invalid=7290, Unknown=0, NotChecked=0, Total=8190 [2021-11-25 19:41:23,425 INFO L87 Difference]: Start difference. First operand 156 states and 158 transitions. Second operand has 82 states, 81 states have (on average 3.9135802469135803) internal successors, (317), 82 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:25,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:25,324 INFO L93 Difference]: Finished difference Result 168 states and 170 transitions. [2021-11-25 19:41:25,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 19:41:25,324 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 3.9135802469135803) internal successors, (317), 82 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 155 [2021-11-25 19:41:25,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:25,325 INFO L225 Difference]: With dead ends: 168 [2021-11-25 19:41:25,325 INFO L226 Difference]: Without dead ends: 166 [2021-11-25 19:41:25,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 523 GetRequests, 411 SyntacticMatches, 2 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3710 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1992, Invalid=10440, Unknown=0, NotChecked=0, Total=12432 [2021-11-25 19:41:25,328 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 740 mSDsluCounter, 910 mSDsCounter, 0 mSdLazyCounter, 2979 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 740 SdHoareTripleChecker+Valid, 927 SdHoareTripleChecker+Invalid, 3106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 2979 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:25,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [740 Valid, 927 Invalid, 3106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 2979 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-25 19:41:25,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-25 19:41:25,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2021-11-25 19:41:25,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:25,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 164 transitions. [2021-11-25 19:41:25,331 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 164 transitions. Word has length 155 [2021-11-25 19:41:25,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:25,332 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 164 transitions. [2021-11-25 19:41:25,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 81 states have (on average 3.9135802469135803) internal successors, (317), 82 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:25,332 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 164 transitions. [2021-11-25 19:41:25,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-25 19:41:25,333 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:25,333 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:25,370 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:25,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:25,556 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:41:25,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:25,556 INFO L85 PathProgramCache]: Analyzing trace with hash 179830513, now seen corresponding path program 14 times [2021-11-25 19:41:25,556 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:25,556 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318425709] [2021-11-25 19:41:25,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:25,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:25,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:26,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 19 proven. 1388 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:26,885 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:26,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318425709] [2021-11-25 19:41:26,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318425709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:26,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932323327] [2021-11-25 19:41:26,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:41:26,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:26,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:26,891 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:26,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 19:41:28,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-11-25 19:41:28,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:28,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 940 conjuncts, 140 conjunts are in the unsatisfiable core [2021-11-25 19:41:28,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:28,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:29,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 19 proven. 1388 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:29,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:32,199 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:41:32,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 129 treesize of output 127 [2021-11-25 19:41:32,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 32 [2021-11-25 19:41:32,400 INFO L354 Elim1Store]: treesize reduction 31, result has 20.5 percent of original size [2021-11-25 19:41:32,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 57 [2021-11-25 19:41:32,713 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 19 proven. 1388 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:32,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932323327] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:32,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513793634] [2021-11-25 19:41:32,714 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:41:32,714 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:32,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:32,714 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:32,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:32,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:32,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:41:32,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:32,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:32,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:32,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:32,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:32,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:32,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:33,022 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:41:33,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:41:33,656 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:35,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36023#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:41:35,488 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:35,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:35,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 98 [2021-11-25 19:41:35,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030847390] [2021-11-25 19:41:35,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:35,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-25 19:41:35,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:35,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-25 19:41:35,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=10996, Unknown=0, NotChecked=0, Total=11342 [2021-11-25 19:41:35,491 INFO L87 Difference]: Start difference. First operand 162 states and 164 transitions. Second operand has 98 states, 98 states have (on average 3.4183673469387754) internal successors, (335), 98 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:41,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:41,690 INFO L93 Difference]: Finished difference Result 283 states and 286 transitions. [2021-11-25 19:41:41,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-25 19:41:41,691 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.4183673469387754) internal successors, (335), 98 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 161 [2021-11-25 19:41:41,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:41,692 INFO L225 Difference]: With dead ends: 283 [2021-11-25 19:41:41,692 INFO L226 Difference]: Without dead ends: 283 [2021-11-25 19:41:41,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 421 SyntacticMatches, 3 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6455 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=1166, Invalid=28246, Unknown=0, NotChecked=0, Total=29412 [2021-11-25 19:41:41,694 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 362 mSDsluCounter, 2425 mSDsCounter, 0 mSdLazyCounter, 5505 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 2359 SdHoareTripleChecker+Invalid, 7697 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 5505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1991 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:41,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [362 Valid, 2359 Invalid, 7697 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 5505 Invalid, 0 Unknown, 1991 Unchecked, 2.3s Time] [2021-11-25 19:41:41,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2021-11-25 19:41:41,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 172. [2021-11-25 19:41:41,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 171 states have (on average 1.023391812865497) internal successors, (175), 171 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:41,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 175 transitions. [2021-11-25 19:41:41,699 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 175 transitions. Word has length 161 [2021-11-25 19:41:41,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:41,699 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 175 transitions. [2021-11-25 19:41:41,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.4183673469387754) internal successors, (335), 98 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:41,700 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 175 transitions. [2021-11-25 19:41:41,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-25 19:41:41,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:41,701 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:41,736 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2021-11-25 19:41:41,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-25 19:41:41,916 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:41:41,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:41,916 INFO L85 PathProgramCache]: Analyzing trace with hash 2001604935, now seen corresponding path program 15 times [2021-11-25 19:41:41,916 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:41,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917516288] [2021-11-25 19:41:41,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:41,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:41,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:42,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 289 proven. 1155 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:42,997 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:42,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917516288] [2021-11-25 19:41:42,998 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917516288] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:42,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130378523] [2021-11-25 19:41:42,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:41:42,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:42,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:42,999 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:43,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 19:41:43,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:41:43,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:43,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 953 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-25 19:41:43,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:43,835 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:43,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:41:46,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 324 proven. 1120 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:46,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:49,080 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 361 proven. 1083 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:49,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130378523] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:49,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1847647019] [2021-11-25 19:41:49,081 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:41:49,081 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:49,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:49,081 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:49,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:49,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:49,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:41:49,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:49,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:49,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:49,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:49,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:49,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:49,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:49,393 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:41:49,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:41:50,034 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:51,816 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37714#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:41:51,816 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:51,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:51,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 122 [2021-11-25 19:41:51,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113964649] [2021-11-25 19:41:51,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:51,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2021-11-25 19:41:51,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:51,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-11-25 19:41:51,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1965, Invalid=15591, Unknown=0, NotChecked=0, Total=17556 [2021-11-25 19:41:51,819 INFO L87 Difference]: Start difference. First operand 172 states and 175 transitions. Second operand has 124 states, 123 states have (on average 3.934959349593496) internal successors, (484), 123 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:54,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:54,239 INFO L93 Difference]: Finished difference Result 303 states and 306 transitions. [2021-11-25 19:41:54,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-25 19:41:54,239 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 123 states have (on average 3.934959349593496) internal successors, (484), 123 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 163 [2021-11-25 19:41:54,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:54,241 INFO L225 Difference]: With dead ends: 303 [2021-11-25 19:41:54,241 INFO L226 Difference]: Without dead ends: 301 [2021-11-25 19:41:54,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 551 GetRequests, 396 SyntacticMatches, 1 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8734 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=3747, Invalid=20433, Unknown=0, NotChecked=0, Total=24180 [2021-11-25 19:41:54,242 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 529 mSDsluCounter, 1243 mSDsCounter, 0 mSdLazyCounter, 3887 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 529 SdHoareTripleChecker+Valid, 1263 SdHoareTripleChecker+Invalid, 3984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 3887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:54,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [529 Valid, 1263 Invalid, 3984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 3887 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-25 19:41:54,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-11-25 19:41:54,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 168. [2021-11-25 19:41:54,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 1.0179640718562875) internal successors, (170), 167 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:54,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2021-11-25 19:41:54,246 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 163 [2021-11-25 19:41:54,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:54,246 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2021-11-25 19:41:54,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 123 states have (on average 3.934959349593496) internal successors, (484), 123 states have internal predecessors, (484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:54,247 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2021-11-25 19:41:54,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-25 19:41:54,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:54,248 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:54,286 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-25 19:41:54,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-25 19:41:54,464 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:41:54,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:54,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1343468463, now seen corresponding path program 16 times [2021-11-25 19:41:54,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:54,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709903248] [2021-11-25 19:41:54,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:54,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:54,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:55,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1525 backedges. 1088 proven. 435 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:41:55,304 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:55,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709903248] [2021-11-25 19:41:55,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709903248] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:55,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912871402] [2021-11-25 19:41:55,305 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:41:55,305 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:55,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:55,316 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:55,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 19:41:55,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:55,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 89 conjunts are in the unsatisfiable core [2021-11-25 19:41:55,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:55,622 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:55,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:41:57,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1525 backedges. 1199 proven. 324 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:41:57,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:58,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1525 backedges. 1142 proven. 381 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:41:58,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912871402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:58,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066114655] [2021-11-25 19:41:58,570 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:41:58,570 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:58,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:58,570 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:58,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:58,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:58,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:41:58,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:41:58,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:41:58,888 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:41:58,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:41:59,598 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:42:00,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39342#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:42:00,817 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:42:00,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:42:00,817 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 43] total 105 [2021-11-25 19:42:00,817 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423141112] [2021-11-25 19:42:00,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:42:00,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-25 19:42:00,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:42:00,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-25 19:42:00,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2101, Invalid=11009, Unknown=0, NotChecked=0, Total=13110 [2021-11-25 19:42:00,819 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand has 106 states, 106 states have (on average 3.509433962264151) internal successors, (372), 105 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:42:02,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:42:02,072 INFO L93 Difference]: Finished difference Result 290 states and 292 transitions. [2021-11-25 19:42:02,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-25 19:42:02,073 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 3.509433962264151) internal successors, (372), 105 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 167 [2021-11-25 19:42:02,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:42:02,074 INFO L225 Difference]: With dead ends: 290 [2021-11-25 19:42:02,074 INFO L226 Difference]: Without dead ends: 171 [2021-11-25 19:42:02,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 427 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8142 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3368, Invalid=15264, Unknown=0, NotChecked=0, Total=18632 [2021-11-25 19:42:02,075 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 135 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 937 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 1003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 937 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:42:02,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 420 Invalid, 1003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 937 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:42:02,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-25 19:42:02,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2021-11-25 19:42:02,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 169 states have (on average 1.017751479289941) internal successors, (172), 169 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:42:02,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 172 transitions. [2021-11-25 19:42:02,078 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 172 transitions. Word has length 167 [2021-11-25 19:42:02,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:42:02,078 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 172 transitions. [2021-11-25 19:42:02,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 3.509433962264151) internal successors, (372), 105 states have internal predecessors, (372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:42:02,078 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 172 transitions. [2021-11-25 19:42:02,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-25 19:42:02,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:42:02,080 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:42:02,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-25 19:42:02,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:42:02,297 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:42:02,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:42:02,297 INFO L85 PathProgramCache]: Analyzing trace with hash -914045401, now seen corresponding path program 17 times [2021-11-25 19:42:02,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:42:02,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414927545] [2021-11-25 19:42:02,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:42:02,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:42:02,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:42:03,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1562 backedges. 20 proven. 1541 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:42:03,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:42:03,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414927545] [2021-11-25 19:42:03,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414927545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:42:03,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430972985] [2021-11-25 19:42:03,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:42:03,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:42:03,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:42:03,803 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:42:03,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 19:42:05,709 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-25 19:42:05,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:42:05,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 984 conjuncts, 194 conjunts are in the unsatisfiable core [2021-11-25 19:42:05,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:42:05,739 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:42:05,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:42:05,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 19:42:07,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:42:13,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1562 backedges. 20 proven. 1542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:42:13,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:43:39,133 WARN L227 SmtUtils]: Spent 21.03s on a formula simplification. DAG size of input: 263 DAG size of output: 90 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:43:40,084 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 19:43:40,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 360 treesize of output 343 [2021-11-25 19:43:40,948 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:43:40,949 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:43:40,974 INFO L354 Elim1Store]: treesize reduction 23, result has 53.1 percent of original size [2021-11-25 19:43:40,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 107 treesize of output 100 [2021-11-25 19:43:41,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:43:41,074 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:43:41,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 49 [2021-11-25 19:43:41,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:43:41,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:43:41,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 36 [2021-11-25 19:43:41,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:43:41,110 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:43:41,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 360 treesize of output 1 [2021-11-25 19:43:41,119 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-25 19:43:41,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 360 treesize of output 1 [2021-11-25 19:43:44,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1562 backedges. 20 proven. 1541 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:43:44,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430972985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:43:44,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [839768795] [2021-11-25 19:43:44,182 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:43:44,183 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:43:44,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:43:44,183 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:43:44,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:43:44,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:43:44,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:43:44,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:43:44,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:43:44,596 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:43:44,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:43:45,263 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:43:48,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41013#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:43:48,213 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:43:48,213 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:43:48,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 52, 53] total 150 [2021-11-25 19:43:48,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739807173] [2021-11-25 19:43:48,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:43:48,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 150 states [2021-11-25 19:43:48,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:43:48,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2021-11-25 19:43:48,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=24580, Unknown=0, NotChecked=0, Total=25122 [2021-11-25 19:43:48,217 INFO L87 Difference]: Start difference. First operand 170 states and 172 transitions. Second operand has 150 states, 150 states have (on average 3.34) internal successors, (501), 150 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:10,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:44:10,738 INFO L93 Difference]: Finished difference Result 593 states and 599 transitions. [2021-11-25 19:44:10,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2021-11-25 19:44:10,739 INFO L78 Accepts]: Start accepts. Automaton has has 150 states, 150 states have (on average 3.34) internal successors, (501), 150 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 169 [2021-11-25 19:44:10,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:44:10,741 INFO L225 Difference]: With dead ends: 593 [2021-11-25 19:44:10,741 INFO L226 Difference]: Without dead ends: 593 [2021-11-25 19:44:10,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 729 GetRequests, 406 SyntacticMatches, 7 SemanticMatches, 316 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25138 ImplicationChecksByTransitivity, 64.8s TimeCoverageRelationStatistics Valid=2137, Invalid=98669, Unknown=0, NotChecked=0, Total=100806 [2021-11-25 19:44:10,745 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 198 mSDsluCounter, 3789 mSDsCounter, 0 mSdLazyCounter, 4397 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 3810 SdHoareTripleChecker+Invalid, 9174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 4397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 4641 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:44:10,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [198 Valid, 3810 Invalid, 9174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 4397 Invalid, 0 Unknown, 4641 Unchecked, 3.4s Time] [2021-11-25 19:44:10,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-11-25 19:44:10,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 180. [2021-11-25 19:44:10,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 179 states have (on average 1.0223463687150838) internal successors, (183), 179 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:10,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 183 transitions. [2021-11-25 19:44:10,752 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 183 transitions. Word has length 169 [2021-11-25 19:44:10,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:44:10,753 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 183 transitions. [2021-11-25 19:44:10,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 150 states, 150 states have (on average 3.34) internal successors, (501), 150 states have internal predecessors, (501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:10,753 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 183 transitions. [2021-11-25 19:44:10,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2021-11-25 19:44:10,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:44:10,755 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:44:10,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 19:44:10,968 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-25 19:44:10,968 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:44:10,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:44:10,968 INFO L85 PathProgramCache]: Analyzing trace with hash -555343235, now seen corresponding path program 18 times [2021-11-25 19:44:10,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:44:10,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030423431] [2021-11-25 19:44:10,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:10,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:44:11,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:12,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1601 backedges. 324 proven. 1276 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:12,200 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:44:12,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030423431] [2021-11-25 19:44:12,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030423431] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:44:12,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456615150] [2021-11-25 19:44:12,200 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:44:12,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:44:12,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:44:12,208 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:44:12,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 19:44:13,137 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:44:13,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:44:13,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 122 conjunts are in the unsatisfiable core [2021-11-25 19:44:13,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:13,164 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:44:13,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:44:15,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1601 backedges. 361 proven. 1239 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:15,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:44:18,947 INFO L134 CoverageAnalysis]: Checked inductivity of 1601 backedges. 400 proven. 1200 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:18,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456615150] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:44:18,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [718538295] [2021-11-25 19:44:18,949 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:44:18,949 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:44:18,949 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:44:18,949 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:44:18,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:44:18,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:18,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:44:19,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:44:19,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:19,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:19,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:44:19,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:19,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:19,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:19,264 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:44:19,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:44:20,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:44:21,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43279#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:44:21,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:44:21,874 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:44:21,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 128 [2021-11-25 19:44:21,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620675403] [2021-11-25 19:44:21,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:44:21,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-11-25 19:44:21,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:44:21,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-11-25 19:44:21,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=17037, Unknown=0, NotChecked=0, Total=19182 [2021-11-25 19:44:21,877 INFO L87 Difference]: Start difference. First operand 180 states and 183 transitions. Second operand has 130 states, 129 states have (on average 3.937984496124031) internal successors, (508), 129 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:24,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:44:24,926 INFO L93 Difference]: Finished difference Result 317 states and 320 transitions. [2021-11-25 19:44:24,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-25 19:44:24,927 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 129 states have (on average 3.937984496124031) internal successors, (508), 129 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 171 [2021-11-25 19:44:24,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:44:24,929 INFO L225 Difference]: With dead ends: 317 [2021-11-25 19:44:24,929 INFO L226 Difference]: Without dead ends: 315 [2021-11-25 19:44:24,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 416 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9558 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=4089, Invalid=22317, Unknown=0, NotChecked=0, Total=26406 [2021-11-25 19:44:24,932 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 379 mSDsluCounter, 1654 mSDsCounter, 0 mSdLazyCounter, 5117 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 1668 SdHoareTripleChecker+Invalid, 5194 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 5117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:44:24,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [379 Valid, 1668 Invalid, 5194 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 5117 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:44:24,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-11-25 19:44:24,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 176. [2021-11-25 19:44:24,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 175 states have (on average 1.0171428571428571) internal successors, (178), 175 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:24,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 178 transitions. [2021-11-25 19:44:24,936 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 178 transitions. Word has length 171 [2021-11-25 19:44:24,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:44:24,937 INFO L470 AbstractCegarLoop]: Abstraction has 176 states and 178 transitions. [2021-11-25 19:44:24,937 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 129 states have (on average 3.937984496124031) internal successors, (508), 129 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:24,937 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 178 transitions. [2021-11-25 19:44:24,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2021-11-25 19:44:24,938 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:44:24,938 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:44:24,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-25 19:44:25,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-25 19:44:25,164 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:44:25,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:44:25,164 INFO L85 PathProgramCache]: Analyzing trace with hash 1180193543, now seen corresponding path program 19 times [2021-11-25 19:44:25,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:44:25,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619433111] [2021-11-25 19:44:25,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:25,165 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:44:25,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:26,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 216 proven. 1463 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:44:26,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:44:26,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619433111] [2021-11-25 19:44:26,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619433111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:44:26,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033715033] [2021-11-25 19:44:26,552 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:44:26,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:44:26,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:44:26,553 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:44:26,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 19:44:26,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:26,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 1015 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-25 19:44:26,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:26,852 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:44:26,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:44:29,468 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 1322 proven. 361 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:44:29,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:44:32,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1685 backedges. 1262 proven. 421 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:44:32,340 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033715033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:44:32,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [689616894] [2021-11-25 19:44:32,341 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:44:32,341 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:44:32,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:44:32,341 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:44:32,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:44:32,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:32,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:44:32,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:32,661 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:44:32,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:44:33,325 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:44:35,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45005#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:44:35,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:44:35,247 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:44:35,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 131 [2021-11-25 19:44:35,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989725630] [2021-11-25 19:44:35,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:44:35,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-25 19:44:35,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:44:35,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-25 19:44:35,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1674, Invalid=18066, Unknown=0, NotChecked=0, Total=19740 [2021-11-25 19:44:35,249 INFO L87 Difference]: Start difference. First operand 176 states and 178 transitions. Second operand has 132 states, 132 states have (on average 3.8181818181818183) internal successors, (504), 131 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:40,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:44:40,800 INFO L93 Difference]: Finished difference Result 299 states and 301 transitions. [2021-11-25 19:44:40,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 19:44:40,800 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.8181818181818183) internal successors, (504), 131 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 175 [2021-11-25 19:44:40,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:44:40,801 INFO L225 Difference]: With dead ends: 299 [2021-11-25 19:44:40,801 INFO L226 Difference]: Without dead ends: 179 [2021-11-25 19:44:40,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 428 SyntacticMatches, 1 SemanticMatches, 185 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10026 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=3519, Invalid=31263, Unknown=0, NotChecked=0, Total=34782 [2021-11-25 19:44:40,803 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 863 mSDsluCounter, 2026 mSDsCounter, 0 mSdLazyCounter, 6475 mSolverCounterSat, 229 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 863 SdHoareTripleChecker+Valid, 2016 SdHoareTripleChecker+Invalid, 6704 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 229 IncrementalHoareTripleChecker+Valid, 6475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:44:40,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [863 Valid, 2016 Invalid, 6704 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [229 Valid, 6475 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-25 19:44:40,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-25 19:44:40,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-11-25 19:44:40,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.0169491525423728) internal successors, (180), 177 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:40,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2021-11-25 19:44:40,805 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 175 [2021-11-25 19:44:40,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:44:40,805 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2021-11-25 19:44:40,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.8181818181818183) internal successors, (504), 131 states have internal predecessors, (504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:40,806 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2021-11-25 19:44:40,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2021-11-25 19:44:40,807 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:44:40,807 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:44:40,832 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2021-11-25 19:44:41,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:44:41,016 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:44:41,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:44:41,016 INFO L85 PathProgramCache]: Analyzing trace with hash -1852008739, now seen corresponding path program 20 times [2021-11-25 19:44:41,016 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:44:41,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977172708] [2021-11-25 19:44:41,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:41,017 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:44:41,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:42,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1724 backedges. 21 proven. 1702 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:42,731 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:44:42,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977172708] [2021-11-25 19:44:42,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977172708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:44:42,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192787421] [2021-11-25 19:44:42,731 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:44:42,731 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:44:42,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:44:42,732 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:44:42,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 19:44:45,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-25 19:44:45,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:44:45,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 1028 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-25 19:44:45,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:44:46,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:46,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1724 backedges. 103 proven. 1620 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:46,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:44:47,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:44:47,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:44:47,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1724 backedges. 103 proven. 1620 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:47,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192787421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:44:47,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002154359] [2021-11-25 19:44:47,395 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:44:47,395 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:44:47,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:44:47,395 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:44:47,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:44:47,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:44:47,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:44:47,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:44:47,738 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:44:47,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:44:48,388 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:44:50,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46719#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:44:50,199 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:44:50,199 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:44:50,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 47, 47] total 80 [2021-11-25 19:44:50,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230322290] [2021-11-25 19:44:50,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:44:50,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-25 19:44:50,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:44:50,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-25 19:44:50,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=7563, Unknown=0, NotChecked=0, Total=7832 [2021-11-25 19:44:50,201 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand has 80 states, 80 states have (on average 3.1) internal successors, (248), 80 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:56,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:44:56,864 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2021-11-25 19:44:56,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-25 19:44:56,865 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 3.1) internal successors, (248), 80 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 177 [2021-11-25 19:44:56,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:44:56,866 INFO L225 Difference]: With dead ends: 307 [2021-11-25 19:44:56,866 INFO L226 Difference]: Without dead ends: 181 [2021-11-25 19:44:56,868 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 648 GetRequests, 490 SyntacticMatches, 3 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5075 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=1048, Invalid=23444, Unknown=0, NotChecked=0, Total=24492 [2021-11-25 19:44:56,868 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 370 mSDsluCounter, 2498 mSDsCounter, 0 mSdLazyCounter, 7735 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 2447 SdHoareTripleChecker+Invalid, 7952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 7735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:44:56,869 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 2447 Invalid, 7952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 7735 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-25 19:44:56,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-25 19:44:56,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2021-11-25 19:44:56,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 179 states have (on average 1.0167597765363128) internal successors, (182), 179 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:56,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 182 transitions. [2021-11-25 19:44:56,872 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 182 transitions. Word has length 177 [2021-11-25 19:44:56,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:44:56,872 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 182 transitions. [2021-11-25 19:44:56,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 3.1) internal successors, (248), 80 states have internal predecessors, (248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:44:56,873 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 182 transitions. [2021-11-25 19:44:56,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-11-25 19:44:56,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:44:56,874 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:44:56,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-25 19:44:57,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-11-25 19:44:57,074 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:44:57,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:44:57,075 INFO L85 PathProgramCache]: Analyzing trace with hash 484392243, now seen corresponding path program 21 times [2021-11-25 19:44:57,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:44:57,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048655741] [2021-11-25 19:44:57,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:44:57,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:44:57,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:44:58,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 361 proven. 1403 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:44:58,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:44:58,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048655741] [2021-11-25 19:44:58,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048655741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:44:58,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842789559] [2021-11-25 19:44:58,278 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:44:58,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:44:58,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:44:58,279 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:44:58,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-25 19:45:00,121 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:45:00,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:45:00,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 1041 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-25 19:45:00,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:45:00,149 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:45:00,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:45:02,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 400 proven. 1364 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:02,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:45:06,412 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 441 proven. 1323 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:06,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842789559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:45:06,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1991212324] [2021-11-25 19:45:06,413 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:45:06,413 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:45:06,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:45:06,413 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:45:06,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:45:06,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:06,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:45:06,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:06,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:06,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:06,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:45:06,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:06,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:06,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:06,705 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:45:06,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:45:07,336 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:45:09,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48555#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:45:09,231 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:45:09,231 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:45:09,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 134 [2021-11-25 19:45:09,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947694606] [2021-11-25 19:45:09,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:45:09,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-25 19:45:09,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:45:09,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-25 19:45:09,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2333, Invalid=18547, Unknown=0, NotChecked=0, Total=20880 [2021-11-25 19:45:09,236 INFO L87 Difference]: Start difference. First operand 180 states and 182 transitions. Second operand has 136 states, 135 states have (on average 3.9407407407407407) internal successors, (532), 135 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:12,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:45:12,005 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2021-11-25 19:45:12,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 19:45:12,006 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 135 states have (on average 3.9407407407407407) internal successors, (532), 135 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 179 [2021-11-25 19:45:12,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:45:12,007 INFO L225 Difference]: With dead ends: 192 [2021-11-25 19:45:12,007 INFO L226 Difference]: Without dead ends: 190 [2021-11-25 19:45:12,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 604 GetRequests, 436 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10390 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=4355, Invalid=24037, Unknown=0, NotChecked=0, Total=28392 [2021-11-25 19:45:12,008 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 591 mSDsluCounter, 1412 mSDsCounter, 0 mSdLazyCounter, 4421 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 591 SdHoareTripleChecker+Valid, 1431 SdHoareTripleChecker+Invalid, 4541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 4421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:45:12,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [591 Valid, 1431 Invalid, 4541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 4421 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-25 19:45:12,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-11-25 19:45:12,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2021-11-25 19:45:12,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 186 states, 185 states have (on average 1.0162162162162163) internal successors, (188), 185 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:12,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 188 transitions. [2021-11-25 19:45:12,012 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 188 transitions. Word has length 179 [2021-11-25 19:45:12,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:45:12,012 INFO L470 AbstractCegarLoop]: Abstraction has 186 states and 188 transitions. [2021-11-25 19:45:12,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 135 states have (on average 3.9407407407407407) internal successors, (532), 135 states have internal predecessors, (532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:12,013 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 188 transitions. [2021-11-25 19:45:12,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-25 19:45:12,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:45:12,014 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:45:12,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-25 19:45:12,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-11-25 19:45:12,228 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:45:12,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:45:12,228 INFO L85 PathProgramCache]: Analyzing trace with hash -1366798061, now seen corresponding path program 22 times [2021-11-25 19:45:12,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:45:12,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240502930] [2021-11-25 19:45:12,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:45:12,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:45:12,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:45:13,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1894 backedges. 22 proven. 1871 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:13,870 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:45:13,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240502930] [2021-11-25 19:45:13,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240502930] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:45:13,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991600545] [2021-11-25 19:45:13,870 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:45:13,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:45:13,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:45:13,873 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:45:13,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 19:45:14,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:45:14,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 1072 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-25 19:45:14,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:45:15,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:15,650 INFO L134 CoverageAnalysis]: Checked inductivity of 1894 backedges. 108 proven. 1785 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:15,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:45:15,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:45:15,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:45:16,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1894 backedges. 108 proven. 1785 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:16,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991600545] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:45:16,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37381060] [2021-11-25 19:45:16,276 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:45:16,276 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:45:16,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:45:16,276 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:45:16,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:45:16,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:16,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:45:16,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:45:16,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:16,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:16,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:45:16,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:16,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:16,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:16,592 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:45:16,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:45:17,263 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:45:19,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50177#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:45:19,074 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:45:19,074 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:45:19,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 49, 49] total 83 [2021-11-25 19:45:19,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117992082] [2021-11-25 19:45:19,075 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:45:19,075 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-25 19:45:19,075 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:45:19,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-25 19:45:19,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=8095, Unknown=0, NotChecked=0, Total=8372 [2021-11-25 19:45:19,076 INFO L87 Difference]: Start difference. First operand 186 states and 188 transitions. Second operand has 83 states, 83 states have (on average 3.108433734939759) internal successors, (258), 83 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:26,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:45:26,025 INFO L93 Difference]: Finished difference Result 321 states and 323 transitions. [2021-11-25 19:45:26,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-25 19:45:26,026 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.108433734939759) internal successors, (258), 83 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 185 [2021-11-25 19:45:26,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:45:26,026 INFO L225 Difference]: With dead ends: 321 [2021-11-25 19:45:26,027 INFO L226 Difference]: Without dead ends: 189 [2021-11-25 19:45:26,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 677 GetRequests, 513 SyntacticMatches, 3 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5458 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1090, Invalid=25316, Unknown=0, NotChecked=0, Total=26406 [2021-11-25 19:45:26,028 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 221 mSDsluCounter, 2639 mSDsCounter, 0 mSdLazyCounter, 8087 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 2591 SdHoareTripleChecker+Invalid, 8351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 8087 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:45:26,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [221 Valid, 2591 Invalid, 8351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 8087 Invalid, 0 Unknown, 122 Unchecked, 3.3s Time] [2021-11-25 19:45:26,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-25 19:45:26,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2021-11-25 19:45:26,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 187 states have (on average 1.0160427807486632) internal successors, (190), 187 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:26,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 190 transitions. [2021-11-25 19:45:26,031 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 190 transitions. Word has length 185 [2021-11-25 19:45:26,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:45:26,032 INFO L470 AbstractCegarLoop]: Abstraction has 188 states and 190 transitions. [2021-11-25 19:45:26,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.108433734939759) internal successors, (258), 83 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:26,032 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 190 transitions. [2021-11-25 19:45:26,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-25 19:45:26,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:45:26,033 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:45:26,078 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-25 19:45:26,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:45:26,252 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:45:26,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:45:26,252 INFO L85 PathProgramCache]: Analyzing trace with hash 113394025, now seen corresponding path program 23 times [2021-11-25 19:45:26,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:45:26,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595125303] [2021-11-25 19:45:26,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:45:26,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:45:26,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:45:27,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1937 backedges. 400 proven. 1536 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:27,393 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:45:27,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595125303] [2021-11-25 19:45:27,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595125303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:45:27,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164226127] [2021-11-25 19:45:27,394 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:45:27,394 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:45:27,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:45:27,394 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:45:27,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 19:45:29,785 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-25 19:45:29,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:45:29,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 1085 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 19:45:29,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:45:29,814 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:45:29,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:45:33,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1937 backedges. 441 proven. 1495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:33,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:45:37,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1937 backedges. 484 proven. 1452 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:37,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164226127] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:45:37,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992728860] [2021-11-25 19:45:37,813 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:45:37,813 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:45:37,814 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:45:37,814 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:45:37,814 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:45:37,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:37,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:45:37,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:37,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:37,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:37,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:38,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:38,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:38,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:38,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:38,148 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:45:38,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:45:38,779 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:45:40,782 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52098#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:45:40,782 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:45:40,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:45:40,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48, 48] total 143 [2021-11-25 19:45:40,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745885918] [2021-11-25 19:45:40,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:45:40,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-25 19:45:40,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:45:40,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-25 19:45:40,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2457, Invalid=21105, Unknown=0, NotChecked=0, Total=23562 [2021-11-25 19:45:40,787 INFO L87 Difference]: Start difference. First operand 188 states and 190 transitions. Second operand has 145 states, 144 states have (on average 3.8958333333333335) internal successors, (561), 144 states have internal predecessors, (561), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:45,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:45:45,272 INFO L93 Difference]: Finished difference Result 200 states and 202 transitions. [2021-11-25 19:45:45,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 19:45:45,273 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 144 states have (on average 3.8958333333333335) internal successors, (561), 144 states have internal predecessors, (561), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 187 [2021-11-25 19:45:45,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:45:45,275 INFO L225 Difference]: With dead ends: 200 [2021-11-25 19:45:45,275 INFO L226 Difference]: Without dead ends: 198 [2021-11-25 19:45:45,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 454 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10062 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=6583, Invalid=34019, Unknown=0, NotChecked=0, Total=40602 [2021-11-25 19:45:45,277 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 2048 mSDsluCounter, 886 mSDsCounter, 0 mSdLazyCounter, 3052 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2048 SdHoareTripleChecker+Valid, 916 SdHoareTripleChecker+Invalid, 3449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 3052 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:45:45,277 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2048 Valid, 916 Invalid, 3449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 3052 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-25 19:45:45,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-25 19:45:45,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 194. [2021-11-25 19:45:45,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 193 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:45,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 196 transitions. [2021-11-25 19:45:45,281 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 196 transitions. Word has length 187 [2021-11-25 19:45:45,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:45:45,282 INFO L470 AbstractCegarLoop]: Abstraction has 194 states and 196 transitions. [2021-11-25 19:45:45,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 144 states have (on average 3.8958333333333335) internal successors, (561), 144 states have internal predecessors, (561), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:45,282 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 196 transitions. [2021-11-25 19:45:45,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-11-25 19:45:45,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:45:45,283 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:45:45,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-25 19:45:45,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:45:45,500 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:45:45,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:45:45,500 INFO L85 PathProgramCache]: Analyzing trace with hash 598267081, now seen corresponding path program 24 times [2021-11-25 19:45:45,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:45:45,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200635606] [2021-11-25 19:45:45,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:45:45,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:45:45,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:45:47,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 23 proven. 2048 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:47,242 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:45:47,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200635606] [2021-11-25 19:45:47,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200635606] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:45:47,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890604574] [2021-11-25 19:45:47,242 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:45:47,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:45:47,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:45:47,243 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:45:47,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 19:45:49,052 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:45:49,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:45:49,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 1116 conjuncts, 155 conjunts are in the unsatisfiable core [2021-11-25 19:45:49,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:45:50,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:50,636 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 113 proven. 1958 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:50,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:45:50,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:45:50,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:45:51,283 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 113 proven. 1958 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:45:51,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890604574] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:45:51,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1716741223] [2021-11-25 19:45:51,284 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:45:51,284 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:45:51,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:45:51,284 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:45:51,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:45:51,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:51,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:45:51,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:45:51,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:51,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:51,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:45:51,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:51,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:51,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:45:51,567 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:45:51,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:45:52,225 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:45:54,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53835#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:45:54,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:45:54,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:45:54,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 51, 51] total 86 [2021-11-25 19:45:54,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814686814] [2021-11-25 19:45:54,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:45:54,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-25 19:45:54,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:45:54,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-25 19:45:54,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=8645, Unknown=0, NotChecked=0, Total=8930 [2021-11-25 19:45:54,081 INFO L87 Difference]: Start difference. First operand 194 states and 196 transitions. Second operand has 86 states, 86 states have (on average 3.116279069767442) internal successors, (268), 86 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:01,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:01,773 INFO L93 Difference]: Finished difference Result 335 states and 337 transitions. [2021-11-25 19:46:01,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-25 19:46:01,774 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 3.116279069767442) internal successors, (268), 86 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 193 [2021-11-25 19:46:01,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:01,775 INFO L225 Difference]: With dead ends: 335 [2021-11-25 19:46:01,775 INFO L226 Difference]: Without dead ends: 197 [2021-11-25 19:46:01,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 706 GetRequests, 536 SyntacticMatches, 3 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5855 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1132, Invalid=27260, Unknown=0, NotChecked=0, Total=28392 [2021-11-25 19:46:01,776 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 416 mSDsluCounter, 2981 mSDsCounter, 0 mSdLazyCounter, 9223 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 2919 SdHoareTripleChecker+Invalid, 9543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 9223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:01,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [416 Valid, 2919 Invalid, 9543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 9223 Invalid, 0 Unknown, 81 Unchecked, 3.8s Time] [2021-11-25 19:46:01,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-11-25 19:46:01,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-11-25 19:46:01,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 195 states have (on average 1.0153846153846153) internal successors, (198), 195 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:01,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2021-11-25 19:46:01,779 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 193 [2021-11-25 19:46:01,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:01,780 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2021-11-25 19:46:01,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 3.116279069767442) internal successors, (268), 86 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:01,780 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2021-11-25 19:46:01,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-25 19:46:01,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:01,781 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:01,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:02,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:02,004 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:46:02,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:02,004 INFO L85 PathProgramCache]: Analyzing trace with hash 703598367, now seen corresponding path program 25 times [2021-11-25 19:46:02,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:02,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417074599] [2021-11-25 19:46:02,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:02,005 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:02,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:03,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 441 proven. 1675 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:03,342 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:03,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417074599] [2021-11-25 19:46:03,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417074599] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:03,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014764253] [2021-11-25 19:46:03,342 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:46:03,342 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:03,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:03,345 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:03,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 19:46:03,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:03,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 1129 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-25 19:46:03,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:05,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 484 proven. 1632 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:05,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:07,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 19:46:07,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 484 proven. 1632 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:07,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014764253] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:46:07,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1643405087] [2021-11-25 19:46:07,209 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:46:07,209 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:46:07,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:46:07,210 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:46:07,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:46:07,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:07,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:46:07,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:46:07,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:07,548 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:46:07,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:46:08,172 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:46:09,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '55789#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:46:09,791 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:46:09,792 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:46:09,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 50, 50] total 101 [2021-11-25 19:46:09,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50623853] [2021-11-25 19:46:09,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:46:09,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2021-11-25 19:46:09,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:09,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2021-11-25 19:46:09,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1360, Invalid=10850, Unknown=0, NotChecked=0, Total=12210 [2021-11-25 19:46:09,794 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 102 states, 101 states have (on average 3.9306930693069306) internal successors, (397), 102 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:12,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:12,915 INFO L93 Difference]: Finished difference Result 208 states and 210 transitions. [2021-11-25 19:46:12,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 19:46:12,916 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 3.9306930693069306) internal successors, (397), 102 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 195 [2021-11-25 19:46:12,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:12,917 INFO L225 Difference]: With dead ends: 208 [2021-11-25 19:46:12,917 INFO L226 Difference]: Without dead ends: 206 [2021-11-25 19:46:12,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 521 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5515 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=3037, Invalid=15595, Unknown=0, NotChecked=0, Total=18632 [2021-11-25 19:46:12,918 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 1442 mSDsluCounter, 1436 mSDsCounter, 0 mSdLazyCounter, 4669 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1442 SdHoareTripleChecker+Valid, 1456 SdHoareTripleChecker+Invalid, 4935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 4669 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:12,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1442 Valid, 1456 Invalid, 4935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 4669 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:46:12,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-25 19:46:12,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 202. [2021-11-25 19:46:12,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 1.0149253731343284) internal successors, (204), 201 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:12,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 204 transitions. [2021-11-25 19:46:12,921 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 204 transitions. Word has length 195 [2021-11-25 19:46:12,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:12,921 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 204 transitions. [2021-11-25 19:46:12,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 101 states have (on average 3.9306930693069306) internal successors, (397), 102 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:12,922 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 204 transitions. [2021-11-25 19:46:12,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2021-11-25 19:46:12,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:12,923 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:12,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-25 19:46:13,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-25 19:46:13,136 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:46:13,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:13,136 INFO L85 PathProgramCache]: Analyzing trace with hash 1781989887, now seen corresponding path program 26 times [2021-11-25 19:46:13,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:13,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510336977] [2021-11-25 19:46:13,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:13,137 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:13,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:15,192 INFO L134 CoverageAnalysis]: Checked inductivity of 2258 backedges. 24 proven. 2233 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:15,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:15,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510336977] [2021-11-25 19:46:15,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510336977] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:15,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982062021] [2021-11-25 19:46:15,192 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:46:15,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:15,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:15,196 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:15,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 19:46:16,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-25 19:46:16,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:46:16,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 161 conjunts are in the unsatisfiable core [2021-11-25 19:46:16,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:18,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:18,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2258 backedges. 118 proven. 2139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:18,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:18,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:46:18,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:46:19,307 INFO L134 CoverageAnalysis]: Checked inductivity of 2258 backedges. 118 proven. 2139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:19,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982062021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:46:19,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [383078984] [2021-11-25 19:46:19,308 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:46:19,308 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:46:19,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:46:19,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:46:19,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:46:19,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:19,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:46:19,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:46:19,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:19,637 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:46:19,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:46:20,277 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:46:22,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57549#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:46:22,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:46:22,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:46:22,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 53, 53] total 89 [2021-11-25 19:46:22,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433332320] [2021-11-25 19:46:22,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:46:22,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-25 19:46:22,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:22,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-25 19:46:22,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=9213, Unknown=0, NotChecked=0, Total=9506 [2021-11-25 19:46:22,196 INFO L87 Difference]: Start difference. First operand 202 states and 204 transitions. Second operand has 89 states, 89 states have (on average 3.1235955056179776) internal successors, (278), 89 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:30,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:30,529 INFO L93 Difference]: Finished difference Result 349 states and 351 transitions. [2021-11-25 19:46:30,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-25 19:46:30,530 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 3.1235955056179776) internal successors, (278), 89 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 201 [2021-11-25 19:46:30,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:30,531 INFO L225 Difference]: With dead ends: 349 [2021-11-25 19:46:30,531 INFO L226 Difference]: Without dead ends: 205 [2021-11-25 19:46:30,533 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 735 GetRequests, 559 SyntacticMatches, 3 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 6266 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=1174, Invalid=29276, Unknown=0, NotChecked=0, Total=30450 [2021-11-25 19:46:30,534 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 332 mSDsluCounter, 3240 mSDsCounter, 0 mSdLazyCounter, 10206 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 3180 SdHoareTripleChecker+Invalid, 10406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 10206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:30,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 3180 Invalid, 10406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 10206 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2021-11-25 19:46:30,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2021-11-25 19:46:30,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2021-11-25 19:46:30,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 203 states have (on average 1.0147783251231528) internal successors, (206), 203 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:30,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 206 transitions. [2021-11-25 19:46:30,538 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 206 transitions. Word has length 201 [2021-11-25 19:46:30,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:30,538 INFO L470 AbstractCegarLoop]: Abstraction has 204 states and 206 transitions. [2021-11-25 19:46:30,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 3.1235955056179776) internal successors, (278), 89 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:30,539 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 206 transitions. [2021-11-25 19:46:30,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2021-11-25 19:46:30,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:30,540 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:30,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:30,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-25 19:46:30,756 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:46:30,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:30,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1985903019, now seen corresponding path program 27 times [2021-11-25 19:46:30,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:30,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634084047] [2021-11-25 19:46:30,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:30,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:30,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:32,191 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 484 proven. 1820 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:32,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:32,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634084047] [2021-11-25 19:46:32,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634084047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:32,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987626154] [2021-11-25 19:46:32,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:46:32,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:32,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:32,193 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:32,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-25 19:46:32,802 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:46:32,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:46:32,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 1173 conjuncts, 142 conjunts are in the unsatisfiable core [2021-11-25 19:46:32,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:32,828 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:46:32,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 19:46:35,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 529 proven. 1775 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:35,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:40,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 576 proven. 1728 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:40,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987626154] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:46:40,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1816531710] [2021-11-25 19:46:40,505 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:46:40,505 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:46:40,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:46:40,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:46:40,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:46:40,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:40,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:46:40,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:40,859 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:46:40,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:46:41,523 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:46:43,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59631#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:46:43,554 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:46:43,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:46:43,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 152 [2021-11-25 19:46:43,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82451224] [2021-11-25 19:46:43,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:46:43,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-25 19:46:43,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:43,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-25 19:46:43,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2945, Invalid=23461, Unknown=0, NotChecked=0, Total=26406 [2021-11-25 19:46:43,557 INFO L87 Difference]: Start difference. First operand 204 states and 206 transitions. Second operand has 154 states, 153 states have (on average 3.947712418300654) internal successors, (604), 153 states have internal predecessors, (604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:47,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:47,718 INFO L93 Difference]: Finished difference Result 216 states and 218 transitions. [2021-11-25 19:46:47,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 19:46:47,718 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 153 states have (on average 3.947712418300654) internal successors, (604), 153 states have internal predecessors, (604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 203 [2021-11-25 19:46:47,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:47,719 INFO L225 Difference]: With dead ends: 216 [2021-11-25 19:46:47,719 INFO L226 Difference]: Without dead ends: 214 [2021-11-25 19:46:47,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 496 SyntacticMatches, 1 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13192 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=5504, Invalid=30406, Unknown=0, NotChecked=0, Total=35910 [2021-11-25 19:46:47,724 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 931 mSDsluCounter, 1959 mSDsCounter, 0 mSdLazyCounter, 6328 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 931 SdHoareTripleChecker+Valid, 1973 SdHoareTripleChecker+Invalid, 6512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 6328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:47,724 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [931 Valid, 1973 Invalid, 6512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 6328 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-25 19:46:47,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-25 19:46:47,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 210. [2021-11-25 19:46:47,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 210 states, 209 states have (on average 1.014354066985646) internal successors, (212), 209 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:47,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2021-11-25 19:46:47,728 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 203 [2021-11-25 19:46:47,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:47,728 INFO L470 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2021-11-25 19:46:47,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 153 states have (on average 3.947712418300654) internal successors, (604), 153 states have internal predecessors, (604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:47,729 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2021-11-25 19:46:47,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-25 19:46:47,730 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:47,730 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:47,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:47,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:47,956 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:46:47,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:47,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1354516299, now seen corresponding path program 28 times [2021-11-25 19:46:47,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:47,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771778217] [2021-11-25 19:46:47,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:47,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:48,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:49,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2452 backedges. 25 proven. 2426 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:49,972 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:49,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771778217] [2021-11-25 19:46:49,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771778217] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:49,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493119018] [2021-11-25 19:46:49,973 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:46:49,973 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:49,973 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:49,974 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:49,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 19:46:50,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:50,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 169 conjunts are in the unsatisfiable core [2021-11-25 19:46:50,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:51,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:52,114 INFO L134 CoverageAnalysis]: Checked inductivity of 2452 backedges. 123 proven. 2328 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:52,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:52,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 19:46:52,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 19:46:52,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2452 backedges. 123 proven. 2328 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:46:52,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493119018] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:46:52,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126566288] [2021-11-25 19:46:52,808 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:46:52,808 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:46:52,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:46:52,809 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:46:52,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:46:52,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:46:52,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:46:52,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:52,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:52,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:52,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:46:53,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:53,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:53,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:46:53,120 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:46:53,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:46:53,766 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:46:55,715 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61460#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:46:55,715 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:46:55,715 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:46:55,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 55, 55] total 92 [2021-11-25 19:46:55,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657521711] [2021-11-25 19:46:55,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:46:55,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-25 19:46:55,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:55,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-25 19:46:55,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=9799, Unknown=0, NotChecked=0, Total=10100 [2021-11-25 19:46:55,717 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand has 92 states, 92 states have (on average 3.130434782608696) internal successors, (288), 92 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:47:04,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:04,384 INFO L93 Difference]: Finished difference Result 363 states and 365 transitions. [2021-11-25 19:47:04,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-25 19:47:04,384 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 3.130434782608696) internal successors, (288), 92 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 209 [2021-11-25 19:47:04,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:04,385 INFO L225 Difference]: With dead ends: 363 [2021-11-25 19:47:04,385 INFO L226 Difference]: Without dead ends: 213 [2021-11-25 19:47:04,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 582 SyntacticMatches, 3 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 6691 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1216, Invalid=31364, Unknown=0, NotChecked=0, Total=32580 [2021-11-25 19:47:04,387 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 448 mSDsluCounter, 3236 mSDsCounter, 0 mSdLazyCounter, 10255 mSolverCounterSat, 258 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 448 SdHoareTripleChecker+Valid, 3187 SdHoareTripleChecker+Invalid, 10513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 258 IncrementalHoareTripleChecker+Valid, 10255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:04,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [448 Valid, 3187 Invalid, 10513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [258 Valid, 10255 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-25 19:47:04,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-11-25 19:47:04,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 212. [2021-11-25 19:47:04,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 211 states have (on average 1.014218009478673) internal successors, (214), 211 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:47:04,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 214 transitions. [2021-11-25 19:47:04,391 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 214 transitions. Word has length 209 [2021-11-25 19:47:04,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:04,391 INFO L470 AbstractCegarLoop]: Abstraction has 212 states and 214 transitions. [2021-11-25 19:47:04,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 3.130434782608696) internal successors, (288), 92 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:47:04,392 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 214 transitions. [2021-11-25 19:47:04,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-11-25 19:47:04,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:04,393 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:04,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 19:47:04,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-25 19:47:04,612 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-25 19:47:04,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:04,612 INFO L85 PathProgramCache]: Analyzing trace with hash -588806389, now seen corresponding path program 29 times [2021-11-25 19:47:04,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:04,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195854005] [2021-11-25 19:47:04,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:04,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:04,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:06,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 529 proven. 1971 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:47:06,122 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:06,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195854005] [2021-11-25 19:47:06,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195854005] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:06,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725077620] [2021-11-25 19:47:06,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:47:06,122 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:06,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:06,123 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:06,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_240cfe84-0681-4592-87c9-0aafb3a36c06/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 19:47:10,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-11-25 19:47:10,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:47:10,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 1217 conjuncts, 116 conjunts are in the unsatisfiable core [2021-11-25 19:47:10,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:13,654 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 576 proven. 1924 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:47:13,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:47:16,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 19:47:16,571 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 576 proven. 1924 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:47:16,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725077620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:47:16,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [606187891] [2021-11-25 19:47:16,572 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-25 19:47:16,572 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:47:16,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:47:16,573 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:47:16,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:47:16,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:16,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 19:47:16,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:47:16,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:47:16,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:47:16,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 19:47:16,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:47:16,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:47:16,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 19:47:16,861 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 19:47:16,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 19:47:17,497 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:47:19,449 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63599#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2021-11-25 19:47:19,449 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:47:19,449 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:47:19,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 54, 54] total 134 [2021-11-25 19:47:19,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383520371] [2021-11-25 19:47:19,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:47:19,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 135 states [2021-11-25 19:47:19,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:19,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2021-11-25 19:47:19,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2570, Invalid=18022, Unknown=0, NotChecked=0, Total=20592 [2021-11-25 19:47:19,452 INFO L87 Difference]: Start difference. First operand 212 states and 214 transitions. Second operand has 135 states, 134 states have (on average 4.3059701492537314) internal successors, (577), 135 states have internal predecessors, (577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)