./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V --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 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:49:13,491 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:49:13,494 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:49:13,563 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:49:13,564 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:49:13,566 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:49:13,568 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:49:13,572 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:49:13,575 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:49:13,576 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:49:13,578 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:49:13,580 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:49:13,581 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:49:13,582 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:49:13,585 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:49:13,587 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:49:13,588 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:49:13,590 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:49:13,593 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:49:13,597 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:49:13,600 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:49:13,602 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:49:13,604 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:49:13,605 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:49:13,610 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:49:13,611 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:49:13,612 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:49:13,614 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:49:13,614 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:49:13,616 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:49:13,617 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:49:13,618 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:49:13,619 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:49:13,620 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:49:13,622 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:49:13,623 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:49:13,624 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:49:13,630 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:49:13,631 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:49:13,632 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:49:13,633 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:49:13,634 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-23 02:49:13,684 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:49:13,687 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:49:13,688 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:49:13,688 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:49:13,689 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:49:13,690 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:49:13,690 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:49:13,691 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:49:13,691 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:49:13,691 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:49:13,693 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:49:13,693 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:49:13,693 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:49:13,694 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:49:13,694 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:49:13,694 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:49:13,695 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:49:13,695 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:49:13,696 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-23 02:49:13,696 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-23 02:49:13,697 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:49:13,697 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:49:13,697 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-23 02:49:13,699 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:49:13,700 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:49:13,700 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:49:13,700 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-23 02:49:13,701 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-23 02:49:13,701 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-23 02:49:13,701 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:49:13,702 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 02:49:13,702 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:49:13,702 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:49:13,703 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:49:13,703 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:49:13,703 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:13,704 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:49:13,704 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:49:13,704 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:49:13,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:49:13,705 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:49:13,705 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:49:13,705 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_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2021-11-23 02:49:14,033 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:49:14,060 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:49:14,063 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:49:14,065 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:49:14,066 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:49:14,068 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-23 02:49:14,146 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/data/11f749bc9/48742cee873b47048a4a92e21c40e652/FLAGab97eb63e [2021-11-23 02:49:14,780 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:49:14,780 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-23 02:49:14,798 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/data/11f749bc9/48742cee873b47048a4a92e21c40e652/FLAGab97eb63e [2021-11-23 02:49:15,055 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/data/11f749bc9/48742cee873b47048a4a92e21c40e652 [2021-11-23 02:49:15,057 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:49:15,059 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:49:15,061 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:15,061 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:49:15,065 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:49:15,066 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,068 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ca3b108 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15, skipping insertion in model container [2021-11-23 02:49:15,068 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,076 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:49:15,123 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:49:15,478 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:15,487 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:49:15,536 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:49:15,577 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:49:15,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15 WrapperNode [2021-11-23 02:49:15,578 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:49:15,580 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:15,580 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:49:15,580 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:49:15,590 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,634 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,682 INFO L137 Inliner]: procedures = 119, calls = 23, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 160 [2021-11-23 02:49:15,683 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:49:15,684 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:49:15,685 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:49:15,685 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:49:15,696 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,720 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,720 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,729 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,735 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,737 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,756 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:49:15,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:49:15,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:49:15,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:49:15,762 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (1/1) ... [2021-11-23 02:49:15,777 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:49:15,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:15,812 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:49:15,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:49:15,876 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:49:15,878 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:49:15,878 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:49:15,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:49:15,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:49:15,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:49:16,019 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:49:16,021 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:49:16,520 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:49:16,587 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:49:16,587 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-23 02:49:16,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:16 BoogieIcfgContainer [2021-11-23 02:49:16,591 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:49:16,593 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:49:16,594 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:49:16,598 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:49:16,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:49:15" (1/3) ... [2021-11-23 02:49:16,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19f8905f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:16, skipping insertion in model container [2021-11-23 02:49:16,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:49:15" (2/3) ... [2021-11-23 02:49:16,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19f8905f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:49:16, skipping insertion in model container [2021-11-23 02:49:16,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:49:16" (3/3) ... [2021-11-23 02:49:16,610 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2021-11-23 02:49:16,617 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:49:16,622 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2021-11-23 02:49:16,692 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:49:16,706 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 [2021-11-23 02:49:16,706 INFO L340 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2021-11-23 02:49:16,727 INFO L276 IsEmpty]: Start isEmpty. Operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:16,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-23 02:49:16,754 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:16,755 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-23 02:49:16,756 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:16,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:16,764 INFO L85 PathProgramCache]: Analyzing trace with hash 220807, now seen corresponding path program 1 times [2021-11-23 02:49:16,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:16,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660171585] [2021-11-23 02:49:16,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:16,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:16,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:17,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:17,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:17,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660171585] [2021-11-23 02:49:17,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660171585] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:17,105 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:17,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-23 02:49:17,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105179776] [2021-11-23 02:49:17,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:17,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:17,116 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:17,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:17,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:17,165 INFO L87 Difference]: Start difference. First operand has 60 states, 34 states have (on average 2.176470588235294) internal successors, (74), 59 states have internal predecessors, (74), 0 states have call successors, (0), 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) [2021-11-23 02:49:17,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:17,257 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-11-23 02:49:17,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:17,260 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 [2021-11-23 02:49:17,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:17,270 INFO L225 Difference]: With dead ends: 58 [2021-11-23 02:49:17,271 INFO L226 Difference]: Without dead ends: 57 [2021-11-23 02:49:17,273 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 [2021-11-23 02:49:17,278 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 63 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:17,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:17,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-23 02:49:17,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-23 02:49:17,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:17,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-23 02:49:17,324 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 3 [2021-11-23 02:49:17,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:17,325 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-23 02:49:17,325 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) [2021-11-23 02:49:17,325 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-23 02:49:17,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-23 02:49:17,326 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:17,326 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-23 02:49:17,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:49:17,327 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:17,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:17,328 INFO L85 PathProgramCache]: Analyzing trace with hash 220808, now seen corresponding path program 1 times [2021-11-23 02:49:17,328 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:17,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532887257] [2021-11-23 02:49:17,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:17,329 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:17,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:17,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:17,438 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:17,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532887257] [2021-11-23 02:49:17,439 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532887257] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:17,439 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:17,439 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:17,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613582290] [2021-11-23 02:49:17,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:17,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:49:17,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:17,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:49:17,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:17,443 INFO L87 Difference]: Start difference. First operand 57 states and 67 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) [2021-11-23 02:49:17,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:17,601 INFO L93 Difference]: Finished difference Result 59 states and 69 transitions. [2021-11-23 02:49:17,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:17,602 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 [2021-11-23 02:49:17,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:17,606 INFO L225 Difference]: With dead ends: 59 [2021-11-23 02:49:17,607 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 02:49:17,607 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 [2021-11-23 02:49:17,615 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 1 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:17,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:17,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 02:49:17,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-23 02:49:17,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.9166666666666667) internal successors, (69), 58 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) [2021-11-23 02:49:17,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2021-11-23 02:49:17,640 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 3 [2021-11-23 02:49:17,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:17,641 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2021-11-23 02:49:17,642 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) [2021-11-23 02:49:17,642 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2021-11-23 02:49:17,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-23 02:49:17,643 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:17,644 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-23 02:49:17,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:49:17,645 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:17,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:17,646 INFO L85 PathProgramCache]: Analyzing trace with hash 212351948, now seen corresponding path program 1 times [2021-11-23 02:49:17,647 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:17,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306523268] [2021-11-23 02:49:17,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:17,650 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:17,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:17,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:17,767 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:17,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306523268] [2021-11-23 02:49:17,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306523268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:17,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126429145] [2021-11-23 02:49:17,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:17,769 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:17,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:17,771 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:17,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:49:17,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:17,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:49:17,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:17,953 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:49:17,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:49:17,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:49:18,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:18,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:18,246 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:49:18,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126429145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:18,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1507794058] [2021-11-23 02:49:18,281 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-23 02:49:18,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:18,287 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:18,293 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:18,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:18,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:18,439 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 [2021-11-23 02:49:18,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:18,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:18,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:18,743 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:19,123 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '340#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet25#1|)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 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|) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_main_#t~nondet25#1| 127) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:19,123 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:19,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:19,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2021-11-23 02:49:19,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029249148] [2021-11-23 02:49:19,124 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:19,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:49:19,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:19,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:49:19,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:49:19,126 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:19,374 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-11-23 02:49:19,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:49:19,375 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 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 [2021-11-23 02:49:19,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:19,377 INFO L225 Difference]: With dead ends: 58 [2021-11-23 02:49:19,377 INFO L226 Difference]: Without dead ends: 58 [2021-11-23 02:49:19,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:49:19,379 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 129 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:19,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 180 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:49:19,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-23 02:49:19,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-11-23 02:49:19,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-23 02:49:19,397 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 5 [2021-11-23 02:49:19,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:19,398 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-23 02:49:19,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,399 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-23 02:49:19,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:49:19,399 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:19,400 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:49:19,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:19,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:19,613 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:19,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:19,614 INFO L85 PathProgramCache]: Analyzing trace with hash -2006848815, now seen corresponding path program 1 times [2021-11-23 02:49:19,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:19,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436758575] [2021-11-23 02:49:19,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:19,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:19,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:19,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:19,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:19,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436758575] [2021-11-23 02:49:19,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436758575] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:19,671 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:19,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:19,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384724875] [2021-11-23 02:49:19,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:19,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:49:19,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:19,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:49:19,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:19,674 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 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) [2021-11-23 02:49:19,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:19,718 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2021-11-23 02:49:19,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:49:19,719 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 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 [2021-11-23 02:49:19,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:19,720 INFO L225 Difference]: With dead ends: 61 [2021-11-23 02:49:19,720 INFO L226 Difference]: Without dead ends: 61 [2021-11-23 02:49:19,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:19,722 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 69 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:19,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 98 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:49:19,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-23 02:49:19,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2021-11-23 02:49:19,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-23 02:49:19,730 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 6 [2021-11-23 02:49:19,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:19,730 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-23 02:49:19,731 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 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) [2021-11-23 02:49:19,731 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-23 02:49:19,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:49:19,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:19,732 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:49:19,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:49:19,732 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:19,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:19,733 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853599, now seen corresponding path program 1 times [2021-11-23 02:49:19,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:19,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309883331] [2021-11-23 02:49:19,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:19,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:19,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:19,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:19,785 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:19,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309883331] [2021-11-23 02:49:19,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309883331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:19,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:19,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-23 02:49:19,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101856326] [2021-11-23 02:49:19,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:19,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:49:19,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:19,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:49:19,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:49:19,794 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 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) [2021-11-23 02:49:19,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:19,848 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-23 02:49:19,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:49:19,849 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 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 [2021-11-23 02:49:19,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:19,851 INFO L225 Difference]: With dead ends: 56 [2021-11-23 02:49:19,852 INFO L226 Difference]: Without dead ends: 56 [2021-11-23 02:49:19,852 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 [2021-11-23 02:49:19,856 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 57 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:19,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 35 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:49:19,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-23 02:49:19,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-23 02:49:19,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:19,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-23 02:49:19,868 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 6 [2021-11-23 02:49:19,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:19,869 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-23 02:49:19,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 2 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) [2021-11-23 02:49:19,869 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-23 02:49:19,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:49:19,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:19,870 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:49:19,870 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:49:19,870 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:19,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:19,871 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853598, now seen corresponding path program 1 times [2021-11-23 02:49:19,871 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:19,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864341193] [2021-11-23 02:49:19,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:19,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:19,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:20,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:20,014 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:20,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864341193] [2021-11-23 02:49:20,015 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864341193] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:20,015 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:20,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:20,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374652688] [2021-11-23 02:49:20,016 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:20,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:49:20,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:20,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:49:20,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:20,019 INFO L87 Difference]: Start difference. First operand 56 states and 66 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) [2021-11-23 02:49:20,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:20,152 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-23 02:49:20,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:49:20,153 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 [2021-11-23 02:49:20,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:20,153 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:49:20,154 INFO L226 Difference]: Without dead ends: 57 [2021-11-23 02:49:20,154 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 [2021-11-23 02:49:20,155 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 63 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:20,155 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 102 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:20,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-23 02:49:20,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-23 02:49:20,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:20,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-23 02:49:20,162 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 6 [2021-11-23 02:49:20,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:20,162 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-23 02:49:20,162 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) [2021-11-23 02:49:20,163 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-23 02:49:20,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:49:20,163 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:20,164 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:20,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:49:20,164 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:20,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:20,165 INFO L85 PathProgramCache]: Analyzing trace with hash -145844409, now seen corresponding path program 1 times [2021-11-23 02:49:20,165 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:20,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047772587] [2021-11-23 02:49:20,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:20,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:20,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:20,255 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:20,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:20,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047772587] [2021-11-23 02:49:20,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047772587] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:20,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527398913] [2021-11-23 02:49:20,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:20,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:20,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:20,258 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:20,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:49:20,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:20,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:49:20,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:20,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:20,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:20,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-23 02:49:20,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:20,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527398913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:20,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [714754215] [2021-11-23 02:49:20,647 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:49:20,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:20,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:20,648 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:20,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:20,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:20,725 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 [2021-11-23 02:49:20,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:20,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:20,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:21,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:21,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:21,262 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 23 treesize of output 19 [2021-11-23 02:49:21,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:21,386 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:22,333 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '876#(and (<= |ULTIMATE.start_main_~length2~0#1| |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (< (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |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_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:22,334 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:22,334 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:22,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2021-11-23 02:49:22,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360330924] [2021-11-23 02:49:22,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:22,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:49:22,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:22,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:49:22,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:49:22,337 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:22,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:22,536 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-23 02:49:22,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:49:22,536 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 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 [2021-11-23 02:49:22,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:22,537 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:49:22,537 INFO L226 Difference]: Without dead ends: 57 [2021-11-23 02:49:22,538 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:49:22,538 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 241 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:22,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 136 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:22,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-23 02:49:22,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-23 02:49:22,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 55 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:22,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-23 02:49:22,548 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 8 [2021-11-23 02:49:22,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:22,549 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-23 02:49:22,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:22,549 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-23 02:49:22,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:49:22,550 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:22,550 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:22,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:22,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:22,751 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:22,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:22,751 INFO L85 PathProgramCache]: Analyzing trace with hash -145849192, now seen corresponding path program 1 times [2021-11-23 02:49:22,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:22,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643376164] [2021-11-23 02:49:22,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:22,752 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:22,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:22,851 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:22,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:22,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643376164] [2021-11-23 02:49:22,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643376164] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:22,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822588352] [2021-11-23 02:49:22,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:22,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:22,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:22,854 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:22,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:49:22,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:22,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:49:22,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:22,933 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:49:22,933 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 [2021-11-23 02:49:23,070 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:23,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:23,280 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:23,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822588352] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:23,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353304380] [2021-11-23 02:49:23,283 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-23 02:49:23,283 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:23,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:23,284 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:23,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:23,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:23,333 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 [2021-11-23 02:49:23,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:23,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:23,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:23,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:23,658 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 23 treesize of output 19 [2021-11-23 02:49:23,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:23,741 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:24,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1056#(and (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_main_#t~nondet27#1| 127) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet27#1|)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (< (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) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:24,424 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:24,424 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:24,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 11 [2021-11-23 02:49:24,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731113123] [2021-11-23 02:49:24,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:24,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:49:24,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:24,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:49:24,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:49:24,426 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:24,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:24,594 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-11-23 02:49:24,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:49:24,595 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 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 [2021-11-23 02:49:24,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:24,596 INFO L225 Difference]: With dead ends: 55 [2021-11-23 02:49:24,596 INFO L226 Difference]: Without dead ends: 55 [2021-11-23 02:49:24,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:49:24,597 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 174 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:24,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 139 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:24,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-23 02:49:24,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-11-23 02:49:24,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 53 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) [2021-11-23 02:49:24,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-11-23 02:49:24,601 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 8 [2021-11-23 02:49:24,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:24,601 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-11-23 02:49:24,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.75) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:24,601 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-11-23 02:49:24,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:49:24,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:24,602 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:24,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:24,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:24,816 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:24,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:24,817 INFO L85 PathProgramCache]: Analyzing trace with hash -226209389, now seen corresponding path program 1 times [2021-11-23 02:49:24,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:24,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604042139] [2021-11-23 02:49:24,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:24,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:24,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:24,939 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:24,939 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:24,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604042139] [2021-11-23 02:49:24,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604042139] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:24,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204206184] [2021-11-23 02:49:24,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:24,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:24,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:24,941 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:24,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:49:25,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:25,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:49:25,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:25,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:25,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:25,235 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 22 treesize of output 18 [2021-11-23 02:49:25,296 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:25,296 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204206184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:25,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [585618725] [2021-11-23 02:49:25,301 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:49:25,302 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:25,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:25,302 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:25,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:25,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:25,352 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 [2021-11-23 02:49:25,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:25,468 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 23 treesize of output 19 [2021-11-23 02:49:25,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:25,599 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 20 treesize of output 16 [2021-11-23 02:49:25,666 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 23 treesize of output 19 [2021-11-23 02:49:25,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:25,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:25,837 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:26,995 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1237#(and (<= |ULTIMATE.start_main_~length2~0#1| |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (= (select (select |#memory_int| |ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) 0) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (= (select |#valid| |ULTIMATE.start_main_~nondetString1~0#1.base|) 1) (< (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|)) (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:26,995 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:26,995 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:26,995 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 13 [2021-11-23 02:49:26,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365249302] [2021-11-23 02:49:26,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:26,996 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 02:49:26,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:26,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 02:49:26,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=356, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:49:26,998 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 15 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:27,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:27,268 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2021-11-23 02:49:27,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:49:27,269 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 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 9 [2021-11-23 02:49:27,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:27,270 INFO L225 Difference]: With dead ends: 54 [2021-11-23 02:49:27,270 INFO L226 Difference]: Without dead ends: 54 [2021-11-23 02:49:27,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:49:27,271 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 457 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:27,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [457 Valid, 138 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:27,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-23 02:49:27,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-11-23 02:49:27,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.75) internal successors, (63), 52 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:27,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2021-11-23 02:49:27,276 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 9 [2021-11-23 02:49:27,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:27,276 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2021-11-23 02:49:27,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:27,284 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2021-11-23 02:49:27,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:49:27,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:27,285 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:27,326 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:27,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:27,505 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:27,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:27,506 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447746, now seen corresponding path program 1 times [2021-11-23 02:49:27,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:27,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733414560] [2021-11-23 02:49:27,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:27,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:27,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:27,561 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:27,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:27,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733414560] [2021-11-23 02:49:27,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733414560] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:27,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:27,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:49:27,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929556954] [2021-11-23 02:49:27,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:27,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:49:27,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:27,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:49:27,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:27,577 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 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) [2021-11-23 02:49:27,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:27,633 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2021-11-23 02:49:27,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:49:27,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 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 [2021-11-23 02:49:27,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:27,634 INFO L225 Difference]: With dead ends: 52 [2021-11-23 02:49:27,634 INFO L226 Difference]: Without dead ends: 52 [2021-11-23 02:49:27,635 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 [2021-11-23 02:49:27,636 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 56 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:27,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 63 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:49:27,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-23 02:49:27,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-23 02:49:27,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 51 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) [2021-11-23 02:49:27,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2021-11-23 02:49:27,641 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 10 [2021-11-23 02:49:27,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:27,641 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2021-11-23 02:49:27,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 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) [2021-11-23 02:49:27,642 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2021-11-23 02:49:27,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:49:27,642 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:27,643 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:27,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:49:27,643 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:27,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:27,644 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447747, now seen corresponding path program 1 times [2021-11-23 02:49:27,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:27,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651230909] [2021-11-23 02:49:27,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:27,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:27,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:27,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:27,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:27,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651230909] [2021-11-23 02:49:27,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651230909] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:27,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396535388] [2021-11-23 02:49:27,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:27,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:27,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:27,795 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:27,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:49:27,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:27,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:49:27,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:27,962 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:27,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:28,001 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 16 [2021-11-23 02:49:28,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:28,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396535388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:28,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1439621501] [2021-11-23 02:49:28,031 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-23 02:49:28,032 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:28,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:28,032 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:28,033 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:28,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:28,074 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 [2021-11-23 02:49:28,127 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 23 treesize of output 19 [2021-11-23 02:49:28,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:28,238 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 23 treesize of output 19 [2021-11-23 02:49:28,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:28,392 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 23 treesize of output 19 [2021-11-23 02:49:28,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:28,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:28,623 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:28,626 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 [2021-11-23 02:49:28,664 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:29,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1439621501] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:29,701 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:29,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 4, 4] total 15 [2021-11-23 02:49:29,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115040826] [2021-11-23 02:49:29,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:29,702 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:49:29,702 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:29,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:49:29,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:49:29,714 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2021-11-23 02:49:29,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:29,927 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2021-11-23 02:49:29,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:49:29,929 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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 [2021-11-23 02:49:29,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:29,930 INFO L225 Difference]: With dead ends: 51 [2021-11-23 02:49:29,930 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:49:29,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:49:29,931 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 195 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:29,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 86 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:49:29,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:49:29,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-23 02:49:29,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:29,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-23 02:49:29,939 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 10 [2021-11-23 02:49:29,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:29,939 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-23 02:49:29,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2021-11-23 02:49:29,940 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-23 02:49:29,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:49:29,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:29,941 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:29,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:30,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:49:30,153 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:30,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:30,154 INFO L85 PathProgramCache]: Analyzing trace with hash -196055170, now seen corresponding path program 1 times [2021-11-23 02:49:30,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:30,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228156745] [2021-11-23 02:49:30,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:30,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:30,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:30,210 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:30,211 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:30,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228156745] [2021-11-23 02:49:30,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228156745] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:30,211 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:30,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:49:30,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434631373] [2021-11-23 02:49:30,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:30,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:49:30,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:30,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:49:30,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:30,214 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 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) [2021-11-23 02:49:30,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:30,287 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2021-11-23 02:49:30,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:49:30,288 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 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 [2021-11-23 02:49:30,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:30,289 INFO L225 Difference]: With dead ends: 52 [2021-11-23 02:49:30,289 INFO L226 Difference]: Without dead ends: 52 [2021-11-23 02:49:30,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:49:30,290 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 139 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:30,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 37 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:49:30,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-23 02:49:30,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-11-23 02:49:30,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 49 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:30,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-23 02:49:30,308 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 12 [2021-11-23 02:49:30,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:30,308 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-23 02:49:30,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 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) [2021-11-23 02:49:30,309 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-23 02:49:30,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:49:30,310 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:30,310 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:30,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:49:30,310 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:30,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:30,311 INFO L85 PathProgramCache]: Analyzing trace with hash -196055169, now seen corresponding path program 1 times [2021-11-23 02:49:30,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:30,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519435461] [2021-11-23 02:49:30,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:30,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:30,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:30,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:30,560 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:30,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519435461] [2021-11-23 02:49:30,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519435461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:30,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963709762] [2021-11-23 02:49:30,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:30,561 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:30,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:30,562 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:30,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:49:30,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:30,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:49:30,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:30,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-23 02:49:30,792 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-23 02:49:30,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 25 [2021-11-23 02:49:30,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:30,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:30,849 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 20 treesize of output 18 [2021-11-23 02:49:30,852 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 24 [2021-11-23 02:49:31,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:31,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963709762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:31,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489704060] [2021-11-23 02:49:31,022 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-23 02:49:31,022 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:31,023 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:31,023 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:31,023 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:31,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:31,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:49:31,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:31,155 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 23 treesize of output 19 [2021-11-23 02:49:31,181 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 23 treesize of output 19 [2021-11-23 02:49:31,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:31,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:31,366 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 23 treesize of output 19 [2021-11-23 02:49:31,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:31,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:31,551 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:31,552 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 [2021-11-23 02:49:31,680 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:33,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1489704060] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:33,237 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:33,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8, 8] total 28 [2021-11-23 02:49:33,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420991529] [2021-11-23 02:49:33,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:33,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 02:49:33,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:33,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 02:49:33,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:49:33,239 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2021-11-23 02:49:33,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:33,466 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2021-11-23 02:49:33,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:49:33,471 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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 [2021-11-23 02:49:33,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:33,472 INFO L225 Difference]: With dead ends: 55 [2021-11-23 02:49:33,472 INFO L226 Difference]: Without dead ends: 55 [2021-11-23 02:49:33,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:49:33,473 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 111 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:33,474 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 95 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:49:33,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-23 02:49:33,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2021-11-23 02:49:33,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.6486486486486487) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:33,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-23 02:49:33,477 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 12 [2021-11-23 02:49:33,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:33,477 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-23 02:49:33,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2021-11-23 02:49:33,478 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-23 02:49:33,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:49:33,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:33,480 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:33,503 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 02:49:33,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:49:33,681 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:33,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:33,681 INFO L85 PathProgramCache]: Analyzing trace with hash 569547529, now seen corresponding path program 1 times [2021-11-23 02:49:33,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:33,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051078305] [2021-11-23 02:49:33,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:33,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:33,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:33,800 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:33,800 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:33,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051078305] [2021-11-23 02:49:33,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051078305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:33,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929049485] [2021-11-23 02:49:33,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:33,801 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:33,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:33,802 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:33,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:49:33,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:33,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:49:33,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:33,893 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:49:33,894 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 [2021-11-23 02:49:33,996 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:33,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:34,112 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:34,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929049485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:34,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [358882739] [2021-11-23 02:49:34,117 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:49:34,117 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:34,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:34,118 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:34,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:34,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:34,167 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 [2021-11-23 02:49:34,218 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 23 treesize of output 19 [2021-11-23 02:49:34,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:34,310 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 23 treesize of output 19 [2021-11-23 02:49:34,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:34,458 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 23 treesize of output 19 [2021-11-23 02:49:34,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:34,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:34,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:34,691 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:34,691 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 [2021-11-23 02:49:35,052 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:37,259 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2050#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:37,259 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:37,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:37,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2021-11-23 02:49:37,259 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122643311] [2021-11-23 02:49:37,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:37,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:49:37,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:37,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:49:37,260 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:49:37,261 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 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) [2021-11-23 02:49:37,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:37,490 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-23 02:49:37,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:49:37,490 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 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) Word has length 14 [2021-11-23 02:49:37,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:37,493 INFO L225 Difference]: With dead ends: 63 [2021-11-23 02:49:37,493 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 02:49:37,493 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=175, Invalid=881, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:49:37,494 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 145 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:37,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 287 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:49:37,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 02:49:37,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 57. [2021-11-23 02:49:37,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.5813953488372092) internal successors, (68), 56 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:37,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2021-11-23 02:49:37,497 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 14 [2021-11-23 02:49:37,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:37,497 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2021-11-23 02:49:37,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 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) [2021-11-23 02:49:37,498 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2021-11-23 02:49:37,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:49:37,498 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:37,499 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:37,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:37,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:49:37,705 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr24ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:37,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:37,706 INFO L85 PathProgramCache]: Analyzing trace with hash 572774269, now seen corresponding path program 1 times [2021-11-23 02:49:37,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:37,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653766244] [2021-11-23 02:49:37,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:37,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:37,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:37,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:49:37,763 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:37,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653766244] [2021-11-23 02:49:37,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653766244] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:37,764 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:37,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:49:37,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613547706] [2021-11-23 02:49:37,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:37,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:49:37,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:37,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:49:37,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:37,767 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 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) [2021-11-23 02:49:37,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:37,809 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2021-11-23 02:49:37,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:49:37,809 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 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 [2021-11-23 02:49:37,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:37,810 INFO L225 Difference]: With dead ends: 56 [2021-11-23 02:49:37,810 INFO L226 Difference]: Without dead ends: 48 [2021-11-23 02:49:37,810 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:49:37,811 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 44 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:37,811 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 64 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:49:37,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-23 02:49:37,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-23 02:49:37,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 35 states have (on average 1.6) internal successors, (56), 47 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) [2021-11-23 02:49:37,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-11-23 02:49:37,813 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 14 [2021-11-23 02:49:37,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:37,813 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-11-23 02:49:37,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:37,814 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-11-23 02:49:37,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:49:37,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:37,814 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:37,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:49:37,814 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:37,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:37,815 INFO L85 PathProgramCache]: Analyzing trace with hash 922644863, now seen corresponding path program 2 times [2021-11-23 02:49:37,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:37,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758592173] [2021-11-23 02:49:37,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:37,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:37,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:38,066 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:38,066 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:38,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758592173] [2021-11-23 02:49:38,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758592173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:38,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894955771] [2021-11-23 02:49:38,067 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:49:38,067 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:38,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:38,068 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:38,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:49:38,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:49:38,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:49:38,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 02:49:38,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:38,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2021-11-23 02:49:38,324 INFO L354 Elim1Store]: treesize reduction 6, result has 71.4 percent of original size [2021-11-23 02:49:38,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 33 [2021-11-23 02:49:38,412 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:49:38,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:38,635 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 54 treesize of output 50 [2021-11-23 02:49:38,637 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 50 treesize of output 46 [2021-11-23 02:49:38,652 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-23 02:49:38,652 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 66 treesize of output 60 [2021-11-23 02:49:38,727 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:49:38,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894955771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:38,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056010098] [2021-11-23 02:49:38,729 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:49:38,729 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:38,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:38,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:38,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:38,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:38,778 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 [2021-11-23 02:49:38,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:38,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:38,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:38,983 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 23 treesize of output 19 [2021-11-23 02:49:39,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:39,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:39,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:39,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:39,259 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:39,259 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 [2021-11-23 02:49:39,609 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:41,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2412#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:41,829 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:41,829 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:41,829 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 23 [2021-11-23 02:49:41,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344488286] [2021-11-23 02:49:41,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:41,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:49:41,830 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:41,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:49:41,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=977, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 02:49:41,831 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:42,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:42,277 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2021-11-23 02:49:42,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 02:49:42,277 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 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 [2021-11-23 02:49:42,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:42,278 INFO L225 Difference]: With dead ends: 61 [2021-11-23 02:49:42,278 INFO L226 Difference]: Without dead ends: 61 [2021-11-23 02:49:42,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=235, Invalid=1657, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:49:42,280 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 26 mSDsluCounter, 557 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 516 SdHoareTripleChecker+Invalid, 451 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 97 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:42,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 516 Invalid, 451 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 345 Invalid, 0 Unknown, 97 Unchecked, 0.2s Time] [2021-11-23 02:49:42,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-23 02:49:42,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2021-11-23 02:49:42,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 45 states have (on average 1.511111111111111) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:42,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-23 02:49:42,285 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2021-11-23 02:49:42,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:42,285 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-23 02:49:42,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 23 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:42,286 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-23 02:49:42,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:49:42,286 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:42,286 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:42,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:42,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:49:42,501 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:42,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:42,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515559, now seen corresponding path program 1 times [2021-11-23 02:49:42,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:42,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630827078] [2021-11-23 02:49:42,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:42,502 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:42,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:42,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:49:42,542 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:42,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630827078] [2021-11-23 02:49:42,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630827078] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:42,542 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:49:42,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:49:42,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791552019] [2021-11-23 02:49:42,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:42,543 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:49:42,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:42,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:49:42,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:49:42,545 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 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) [2021-11-23 02:49:42,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:42,591 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-23 02:49:42,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:49:42,591 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 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 19 [2021-11-23 02:49:42,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:42,592 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:49:42,593 INFO L226 Difference]: Without dead ends: 57 [2021-11-23 02:49:42,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:49:42,594 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 78 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:42,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 49 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:49:42,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-23 02:49:42,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-23 02:49:42,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.488888888888889) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-23 02:49:42,597 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 19 [2021-11-23 02:49:42,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:42,597 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-23 02:49:42,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 5 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) [2021-11-23 02:49:42,597 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-23 02:49:42,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:49:42,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:42,599 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:42,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:49:42,600 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:42,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:42,600 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515558, now seen corresponding path program 1 times [2021-11-23 02:49:42,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:42,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359919939] [2021-11-23 02:49:42,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:42,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:42,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:42,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:49:42,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:42,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359919939] [2021-11-23 02:49:42,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359919939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:42,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136094532] [2021-11-23 02:49:42,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:42,691 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:42,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:42,692 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:42,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:49:42,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:42,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 02:49:42,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:42,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:49:42,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:42,925 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 16 [2021-11-23 02:49:42,937 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:49:42,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136094532] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:42,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206210268] [2021-11-23 02:49:42,939 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2021-11-23 02:49:42,939 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:42,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:42,940 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:42,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:42,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:42,995 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 [2021-11-23 02:49:43,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:43,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:43,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:43,153 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:49:43,154 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 87 treesize of output 86 [2021-11-23 02:49:43,216 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 23 treesize of output 19 [2021-11-23 02:49:43,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:43,282 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:43,283 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 [2021-11-23 02:49:43,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:45,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [206210268] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:49:45,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:45,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [4, 4, 4] total 18 [2021-11-23 02:49:45,595 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121934371] [2021-11-23 02:49:45,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:49:45,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 02:49:45,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:45,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 02:49:45,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=272, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:49:45,596 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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) [2021-11-23 02:49:45,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:45,851 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-23 02:49:45,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:49:45,852 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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 19 [2021-11-23 02:49:45,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:45,852 INFO L225 Difference]: With dead ends: 62 [2021-11-23 02:49:45,852 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 02:49:45,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=108, Invalid=272, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:49:45,853 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 95 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:45,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 84 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:49:45,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 02:49:45,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-11-23 02:49:45,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 60 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:45,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 71 transitions. [2021-11-23 02:49:45,856 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 71 transitions. Word has length 19 [2021-11-23 02:49:45,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:45,857 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 71 transitions. [2021-11-23 02:49:45,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 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) [2021-11-23 02:49:45,857 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 71 transitions. [2021-11-23 02:49:45,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 02:49:45,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:45,858 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:45,898 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:46,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:49:46,069 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:46,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:46,070 INFO L85 PathProgramCache]: Analyzing trace with hash -690501505, now seen corresponding path program 3 times [2021-11-23 02:49:46,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:46,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651596928] [2021-11-23 02:49:46,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:46,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:46,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:46,323 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:46,323 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:46,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651596928] [2021-11-23 02:49:46,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651596928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:46,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916788895] [2021-11-23 02:49:46,323 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:49:46,324 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:46,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:46,324 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:46,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:49:46,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:49:46,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:49:46,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 02:49:46,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:46,501 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 21 treesize of output 17 [2021-11-23 02:49:46,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-11-23 02:49:46,540 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:46,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:46,561 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 [2021-11-23 02:49:46,562 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 [2021-11-23 02:49:46,674 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:46,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916788895] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:46,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1518004122] [2021-11-23 02:49:46,679 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:49:46,679 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:46,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:46,680 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:46,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:46,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:46,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:49:46,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:46,809 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 23 treesize of output 19 [2021-11-23 02:49:46,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:46,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:46,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:46,983 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 23 treesize of output 19 [2021-11-23 02:49:47,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:47,111 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:47,111 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 [2021-11-23 02:49:47,406 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:49,475 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3071#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:49,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:49,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:49,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2021-11-23 02:49:49,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565012449] [2021-11-23 02:49:49,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:49,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:49:49,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:49,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:49:49,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:49:49,477 INFO L87 Difference]: Start difference. First operand 61 states and 71 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:50,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:50,119 INFO L93 Difference]: Finished difference Result 168 states and 195 transitions. [2021-11-23 02:49:50,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:49:50,119 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 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 20 [2021-11-23 02:49:50,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:50,121 INFO L225 Difference]: With dead ends: 168 [2021-11-23 02:49:50,121 INFO L226 Difference]: Without dead ends: 168 [2021-11-23 02:49:50,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=257, Invalid=1723, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:49:50,122 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 980 mSDsluCounter, 939 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 980 SdHoareTripleChecker+Valid, 933 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:50,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [980 Valid, 933 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:49:50,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-23 02:49:50,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 71. [2021-11-23 02:49:50,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.4067796610169492) internal successors, (83), 70 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:50,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2021-11-23 02:49:50,127 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 20 [2021-11-23 02:49:50,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:50,127 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2021-11-23 02:49:50,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:50,127 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2021-11-23 02:49:50,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 02:49:50,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:50,128 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:50,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:50,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:50,357 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:50,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:50,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1890947467, now seen corresponding path program 4 times [2021-11-23 02:49:50,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:50,357 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098815801] [2021-11-23 02:49:50,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:50,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:50,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:50,535 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:50,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:50,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098815801] [2021-11-23 02:49:50,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098815801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:50,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169612082] [2021-11-23 02:49:50,536 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:49:50,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:50,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:50,537 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:50,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:49:50,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:50,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 02:49:50,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:50,736 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:50,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:49:50,878 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 [2021-11-23 02:49:50,897 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:49:50,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169612082] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:49:50,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1456766508] [2021-11-23 02:49:50,899 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:49:50,899 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:49:50,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:49:50,899 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:49:50,899 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:49:50,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:49:50,948 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 [2021-11-23 02:49:50,987 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 20 treesize of output 16 [2021-11-23 02:49:51,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:51,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:51,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:49:51,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:51,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:49:51,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:49:51,326 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:51,327 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 [2021-11-23 02:49:51,607 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:49:53,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3497#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:49:53,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:49:53,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:49:53,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2021-11-23 02:49:53,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038269765] [2021-11-23 02:49:53,721 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:49:53,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:49:53,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:49:53,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:49:53,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1060, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 02:49:53,723 INFO L87 Difference]: Start difference. First operand 71 states and 83 transitions. Second operand has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:54,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:49:54,589 INFO L93 Difference]: Finished difference Result 230 states and 269 transitions. [2021-11-23 02:49:54,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:49:54,590 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 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 [2021-11-23 02:49:54,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:49:54,591 INFO L225 Difference]: With dead ends: 230 [2021-11-23 02:49:54,591 INFO L226 Difference]: Without dead ends: 230 [2021-11-23 02:49:54,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=368, Invalid=1888, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:49:54,593 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 973 mSDsluCounter, 974 mSDsCounter, 0 mSdLazyCounter, 1118 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 973 SdHoareTripleChecker+Valid, 1031 SdHoareTripleChecker+Invalid, 1148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:49:54,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [973 Valid, 1031 Invalid, 1148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1118 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:49:54,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-23 02:49:54,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 73. [2021-11-23 02:49:54,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 61 states have (on average 1.4098360655737705) internal successors, (86), 72 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) [2021-11-23 02:49:54,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 86 transitions. [2021-11-23 02:49:54,597 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 86 transitions. Word has length 22 [2021-11-23 02:49:54,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:49:54,598 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 86 transitions. [2021-11-23 02:49:54,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 25 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:49:54,598 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 86 transitions. [2021-11-23 02:49:54,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:49:54,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:49:54,599 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:49:54,621 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:49:54,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-11-23 02:49:54,805 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:49:54,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:49:54,806 INFO L85 PathProgramCache]: Analyzing trace with hash 460224418, now seen corresponding path program 1 times [2021-11-23 02:49:54,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:49:54,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250347383] [2021-11-23 02:49:54,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:54,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:49:54,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:55,045 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:49:55,045 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:49:55,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250347383] [2021-11-23 02:49:55,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250347383] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:49:55,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581834997] [2021-11-23 02:49:55,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:49:55,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:49:55,046 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:49:55,047 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:49:55,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:49:55,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:49:55,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:49:55,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:49:55,109 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 [2021-11-23 02:49:55,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:49:55,250 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:49:55,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:49:55,461 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:49:55,461 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 38 treesize of output 23 [2021-11-23 02:49:55,470 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:49:55,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:01,967 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 46 treesize of output 42 [2021-11-23 02:50:02,070 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:02,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581834997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:50:02,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849442511] [2021-11-23 02:50:02,072 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:50:02,072 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:50:02,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:50:02,073 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:50:02,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:50:02,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:02,122 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 [2021-11-23 02:50:02,160 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 20 treesize of output 16 [2021-11-23 02:50:02,193 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 23 treesize of output 19 [2021-11-23 02:50:02,226 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 23 treesize of output 19 [2021-11-23 02:50:02,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:02,283 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 91 treesize of output 83 [2021-11-23 02:50:02,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:02,349 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 [2021-11-23 02:50:02,391 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:02,391 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 [2021-11-23 02:50:03,316 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:08,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3991#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:50:08,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:50:08,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:50:08,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 22 [2021-11-23 02:50:08,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161904504] [2021-11-23 02:50:08,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:50:08,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:50:08,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:08,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:50:08,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=1399, Unknown=6, NotChecked=0, Total=1560 [2021-11-23 02:50:08,873 INFO L87 Difference]: Start difference. First operand 73 states and 86 transitions. Second operand has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:09,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:09,186 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2021-11-23 02:50:09,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:50:09,187 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 0 states have call successors, (0), 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 23 [2021-11-23 02:50:09,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:09,188 INFO L225 Difference]: With dead ends: 108 [2021-11-23 02:50:09,188 INFO L226 Difference]: Without dead ends: 97 [2021-11-23 02:50:09,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=198, Invalid=1688, Unknown=6, NotChecked=0, Total=1892 [2021-11-23 02:50:09,190 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 24 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:09,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 360 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 174 Invalid, 0 Unknown, 37 Unchecked, 0.1s Time] [2021-11-23 02:50:09,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-23 02:50:09,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-11-23 02:50:09,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 84 states have (on average 1.3333333333333333) internal successors, (112), 95 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) [2021-11-23 02:50:09,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2021-11-23 02:50:09,195 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 23 [2021-11-23 02:50:09,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:09,196 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2021-11-23 02:50:09,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:09,196 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2021-11-23 02:50:09,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:50:09,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:09,198 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:09,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:09,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:09,417 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:09,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:09,418 INFO L85 PathProgramCache]: Analyzing trace with hash 2062077594, now seen corresponding path program 1 times [2021-11-23 02:50:09,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:09,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050154376] [2021-11-23 02:50:09,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:09,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:09,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:09,523 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:09,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:09,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050154376] [2021-11-23 02:50:09,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050154376] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:09,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182833337] [2021-11-23 02:50:09,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:09,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:09,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:09,527 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:09,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:50:09,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:09,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:50:09,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:09,640 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:50:09,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:50:09,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:50:09,835 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:09,835 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:10,008 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:10,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182833337] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:10,008 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:50:10,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 9 [2021-11-23 02:50:10,009 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90294440] [2021-11-23 02:50:10,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:10,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:50:10,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:10,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:50:10,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:50:10,010 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:10,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:10,118 INFO L93 Difference]: Finished difference Result 99 states and 115 transitions. [2021-11-23 02:50:10,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:50:10,121 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 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 23 [2021-11-23 02:50:10,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:10,122 INFO L225 Difference]: With dead ends: 99 [2021-11-23 02:50:10,122 INFO L226 Difference]: Without dead ends: 99 [2021-11-23 02:50:10,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:50:10,123 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 53 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:10,123 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 68 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:50:10,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-23 02:50:10,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 93. [2021-11-23 02:50:10,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 81 states have (on average 1.345679012345679) internal successors, (109), 92 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:10,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 109 transitions. [2021-11-23 02:50:10,128 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 109 transitions. Word has length 23 [2021-11-23 02:50:10,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:10,128 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 109 transitions. [2021-11-23 02:50:10,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:10,128 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 109 transitions. [2021-11-23 02:50:10,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 02:50:10,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:10,135 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:10,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:10,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:10,335 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:10,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:10,336 INFO L85 PathProgramCache]: Analyzing trace with hash -429345665, now seen corresponding path program 5 times [2021-11-23 02:50:10,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:10,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638807717] [2021-11-23 02:50:10,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:10,336 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:10,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:10,680 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:50:10,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:10,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638807717] [2021-11-23 02:50:10,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638807717] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:10,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197545443] [2021-11-23 02:50:10,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:50:10,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:10,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:10,685 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:10,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:50:10,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:50:10,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:50:10,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 02:50:10,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:10,801 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:50:10,801 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 [2021-11-23 02:50:10,918 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 23 treesize of output 19 [2021-11-23 02:50:11,056 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:50:11,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 26 [2021-11-23 02:50:11,129 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:50:11,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:11,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-23 02:50:11,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 35 [2021-11-23 02:50:11,502 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:50:11,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197545443] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:50:11,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [122363898] [2021-11-23 02:50:11,504 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:50:11,504 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:50:11,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:50:11,505 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:50:11,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:50:11,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:11,545 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 [2021-11-23 02:50:11,590 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 20 treesize of output 16 [2021-11-23 02:50:11,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:11,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:11,727 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 20 treesize of output 16 [2021-11-23 02:50:11,772 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 23 treesize of output 19 [2021-11-23 02:50:11,808 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 23 treesize of output 19 [2021-11-23 02:50:11,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:50:11,929 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:11,929 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 [2021-11-23 02:50:12,184 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:14,729 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4723#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (< (select |#length| |ULTIMATE.start_cstrlen_~s~0#1.base|) (+ |ULTIMATE.start_cstrlen_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:50:14,729 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:50:14,729 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:50:14,730 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5, 5] total 25 [2021-11-23 02:50:14,730 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648035215] [2021-11-23 02:50:14,730 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:50:14,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:50:14,730 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:14,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:50:14,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1140, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:50:14,732 INFO L87 Difference]: Start difference. First operand 93 states and 109 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 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) [2021-11-23 02:50:15,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:15,548 INFO L93 Difference]: Finished difference Result 113 states and 133 transitions. [2021-11-23 02:50:15,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 02:50:15,550 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 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) Word has length 24 [2021-11-23 02:50:15,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:15,551 INFO L225 Difference]: With dead ends: 113 [2021-11-23 02:50:15,551 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 02:50:15,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 720 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=331, Invalid=3209, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:50:15,553 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 32 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:15,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 441 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 386 Invalid, 0 Unknown, 77 Unchecked, 0.2s Time] [2021-11-23 02:50:15,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 02:50:15,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 103. [2021-11-23 02:50:15,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 92 states have (on average 1.3043478260869565) internal successors, (120), 102 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) [2021-11-23 02:50:15,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 120 transitions. [2021-11-23 02:50:15,559 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 120 transitions. Word has length 24 [2021-11-23 02:50:15,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:15,559 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 120 transitions. [2021-11-23 02:50:15,559 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 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) [2021-11-23 02:50:15,559 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 120 transitions. [2021-11-23 02:50:15,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 02:50:15,560 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:15,560 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:15,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:15,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:15,773 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:15,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:15,773 INFO L85 PathProgramCache]: Analyzing trace with hash -761001242, now seen corresponding path program 2 times [2021-11-23 02:50:15,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:15,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627785591] [2021-11-23 02:50:15,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:15,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:15,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:15,880 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:15,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:15,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627785591] [2021-11-23 02:50:15,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [627785591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:15,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [619036539] [2021-11-23 02:50:15,881 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:50:15,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:15,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:15,882 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:15,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:50:15,958 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:50:15,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:50:15,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 02:50:15,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:16,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-23 02:50:16,133 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-23 02:50:16,133 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 34 treesize of output 33 [2021-11-23 02:50:16,494 INFO L354 Elim1Store]: treesize reduction 48, result has 34.2 percent of original size [2021-11-23 02:50:16,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 45 [2021-11-23 02:50:16,649 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:50:16,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:17,952 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 [2021-11-23 02:50:17,971 INFO L354 Elim1Store]: treesize reduction 23, result has 46.5 percent of original size [2021-11-23 02:50:17,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 209 treesize of output 176 [2021-11-23 02:50:17,981 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:50:17,981 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 74 treesize of output 72 [2021-11-23 02:50:18,059 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 28 treesize of output 26 [2021-11-23 02:50:18,081 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:50:18,091 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:50:18,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 53 [2021-11-23 02:50:18,330 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:50:18,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [619036539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:50:18,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147505073] [2021-11-23 02:50:18,332 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:50:18,332 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:50:18,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:50:18,333 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:50:18,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:50:18,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:18,388 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 [2021-11-23 02:50:18,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:50:18,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:18,482 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 23 treesize of output 19 [2021-11-23 02:50:18,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:18,530 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 91 treesize of output 83 [2021-11-23 02:50:18,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:18,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:50:18,675 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:18,676 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 [2021-11-23 02:50:19,591 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:25,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5168#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:50:25,488 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:50:25,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:50:25,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 25 [2021-11-23 02:50:25,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538837395] [2021-11-23 02:50:25,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:50:25,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:50:25,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:25,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:50:25,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1601, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:50:25,490 INFO L87 Difference]: Start difference. First operand 103 states and 120 transitions. Second operand has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:25,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:25,920 INFO L93 Difference]: Finished difference Result 143 states and 167 transitions. [2021-11-23 02:50:25,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:50:25,921 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 states have internal predecessors, (65), 0 states have call successors, (0), 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 25 [2021-11-23 02:50:25,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:25,922 INFO L225 Difference]: With dead ends: 143 [2021-11-23 02:50:25,922 INFO L226 Difference]: Without dead ends: 143 [2021-11-23 02:50:25,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=382, Invalid=2270, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:50:25,924 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 116 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:25,925 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 278 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 65 Unchecked, 0.2s Time] [2021-11-23 02:50:25,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-23 02:50:25,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 128. [2021-11-23 02:50:25,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 117 states have (on average 1.3846153846153846) internal successors, (162), 127 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:25,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 162 transitions. [2021-11-23 02:50:25,931 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 162 transitions. Word has length 25 [2021-11-23 02:50:25,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:25,931 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 162 transitions. [2021-11-23 02:50:25,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.5) internal successors, (65), 26 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:25,931 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 162 transitions. [2021-11-23 02:50:25,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:50:25,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:25,933 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:25,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:26,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 02:50:26,153 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:26,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:26,153 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242575, now seen corresponding path program 1 times [2021-11-23 02:50:26,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:26,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141455532] [2021-11-23 02:50:26,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:26,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:26,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:26,203 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:50:26,203 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:26,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141455532] [2021-11-23 02:50:26,204 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141455532] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:26,204 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:26,204 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:50:26,204 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629906376] [2021-11-23 02:50:26,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:26,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:50:26,205 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:26,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:50:26,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:50:26,206 INFO L87 Difference]: Start difference. First operand 128 states and 162 transitions. Second operand has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:26,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:26,251 INFO L93 Difference]: Finished difference Result 135 states and 168 transitions. [2021-11-23 02:50:26,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:50:26,252 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 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 26 [2021-11-23 02:50:26,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:26,252 INFO L225 Difference]: With dead ends: 135 [2021-11-23 02:50:26,252 INFO L226 Difference]: Without dead ends: 135 [2021-11-23 02:50:26,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:50:26,254 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 92 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:26,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 37 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:50:26,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-23 02:50:26,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 126. [2021-11-23 02:50:26,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 117 states have (on average 1.3504273504273505) internal successors, (158), 125 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) [2021-11-23 02:50:26,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 158 transitions. [2021-11-23 02:50:26,258 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 158 transitions. Word has length 26 [2021-11-23 02:50:26,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:26,258 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 158 transitions. [2021-11-23 02:50:26,258 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.0) internal successors, (24), 5 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:26,259 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 158 transitions. [2021-11-23 02:50:26,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:50:26,259 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:26,259 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:26,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-23 02:50:26,260 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:26,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:26,260 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242574, now seen corresponding path program 1 times [2021-11-23 02:50:26,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:26,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546509563] [2021-11-23 02:50:26,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:26,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:26,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:26,353 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:26,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:26,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546509563] [2021-11-23 02:50:26,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546509563] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:26,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915179312] [2021-11-23 02:50:26,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:26,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:26,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:26,360 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:26,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:50:26,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:26,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 02:50:26,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:26,460 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:50:26,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:50:26,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:50:26,703 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:26,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:26,952 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:26,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915179312] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:26,952 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:50:26,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 21 [2021-11-23 02:50:26,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400891965] [2021-11-23 02:50:26,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:26,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 02:50:26,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:26,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 02:50:26,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:50:26,954 INFO L87 Difference]: Start difference. First operand 126 states and 158 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:27,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:27,203 INFO L93 Difference]: Finished difference Result 217 states and 262 transitions. [2021-11-23 02:50:27,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:50:27,203 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 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 26 [2021-11-23 02:50:27,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:27,205 INFO L225 Difference]: With dead ends: 217 [2021-11-23 02:50:27,205 INFO L226 Difference]: Without dead ends: 217 [2021-11-23 02:50:27,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=696, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:50:27,206 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 208 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:27,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 147 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:50:27,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2021-11-23 02:50:27,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 141. [2021-11-23 02:50:27,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 133 states have (on average 1.3233082706766917) internal successors, (176), 140 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:27,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 176 transitions. [2021-11-23 02:50:27,212 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 176 transitions. Word has length 26 [2021-11-23 02:50:27,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:27,212 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 176 transitions. [2021-11-23 02:50:27,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:27,213 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 176 transitions. [2021-11-23 02:50:27,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:50:27,213 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:27,214 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:27,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:27,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 02:50:27,429 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:27,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:27,429 INFO L85 PathProgramCache]: Analyzing trace with hash -1179008278, now seen corresponding path program 1 times [2021-11-23 02:50:27,430 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:27,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280827210] [2021-11-23 02:50:27,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:27,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:27,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:27,473 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:50:27,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:27,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280827210] [2021-11-23 02:50:27,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280827210] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:27,474 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:27,474 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:50:27,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1447462178] [2021-11-23 02:50:27,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:27,474 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:50:27,475 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:27,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:50:27,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:50:27,476 INFO L87 Difference]: Start difference. First operand 141 states and 176 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:27,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:27,557 INFO L93 Difference]: Finished difference Result 149 states and 184 transitions. [2021-11-23 02:50:27,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:50:27,558 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 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 27 [2021-11-23 02:50:27,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:27,559 INFO L225 Difference]: With dead ends: 149 [2021-11-23 02:50:27,559 INFO L226 Difference]: Without dead ends: 149 [2021-11-23 02:50:27,559 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:50:27,560 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:27,561 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 65 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:50:27,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-23 02:50:27,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 140. [2021-11-23 02:50:27,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 133 states have (on average 1.3082706766917294) internal successors, (174), 139 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:27,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 174 transitions. [2021-11-23 02:50:27,566 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 174 transitions. Word has length 27 [2021-11-23 02:50:27,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:27,567 INFO L470 AbstractCegarLoop]: Abstraction has 140 states and 174 transitions. [2021-11-23 02:50:27,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:27,567 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 174 transitions. [2021-11-23 02:50:27,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:50:27,568 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:27,568 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:27,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-23 02:50:27,568 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:27,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:27,569 INFO L85 PathProgramCache]: Analyzing trace with hash -1179008277, now seen corresponding path program 1 times [2021-11-23 02:50:27,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:27,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112695494] [2021-11-23 02:50:27,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:27,570 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:27,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:27,710 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:27,710 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:27,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112695494] [2021-11-23 02:50:27,710 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112695494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:27,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365895722] [2021-11-23 02:50:27,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:27,711 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:27,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:27,713 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:27,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:50:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:27,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:50:27,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:27,966 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:27,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:28,171 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 [2021-11-23 02:50:28,188 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:28,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365895722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:50:28,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1313193572] [2021-11-23 02:50:28,191 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-23 02:50:28,191 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:50:28,191 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:50:28,192 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:50:28,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:50:28,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:28,224 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 [2021-11-23 02:50:28,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:50:28,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:28,341 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 20 treesize of output 16 [2021-11-23 02:50:28,405 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:50:28,406 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 87 treesize of output 86 [2021-11-23 02:50:28,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:28,528 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 [2021-11-23 02:50:28,584 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:28,584 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 [2021-11-23 02:50:28,944 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:34,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1313193572] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:34,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:50:34,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [8, 8, 8] total 36 [2021-11-23 02:50:34,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113805012] [2021-11-23 02:50:34,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:34,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:50:34,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:34,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:50:34,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=1040, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:50:34,734 INFO L87 Difference]: Start difference. First operand 140 states and 174 transitions. Second operand has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:35,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:35,194 INFO L93 Difference]: Finished difference Result 133 states and 157 transitions. [2021-11-23 02:50:35,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:50:35,194 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 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 27 [2021-11-23 02:50:35,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:35,195 INFO L225 Difference]: With dead ends: 133 [2021-11-23 02:50:35,195 INFO L226 Difference]: Without dead ends: 133 [2021-11-23 02:50:35,195 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=220, Invalid=1040, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:50:35,196 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 109 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:35,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 112 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:50:35,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-11-23 02:50:35,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 130. [2021-11-23 02:50:35,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 123 states have (on average 1.2520325203252032) internal successors, (154), 129 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) [2021-11-23 02:50:35,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 154 transitions. [2021-11-23 02:50:35,202 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 154 transitions. Word has length 27 [2021-11-23 02:50:35,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:35,202 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 154 transitions. [2021-11-23 02:50:35,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:35,203 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 154 transitions. [2021-11-23 02:50:35,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:50:35,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:35,204 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:35,224 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:35,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:35,409 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:35,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:35,410 INFO L85 PathProgramCache]: Analyzing trace with hash 733298850, now seen corresponding path program 1 times [2021-11-23 02:50:35,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:35,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94564202] [2021-11-23 02:50:35,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:35,417 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:35,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:35,673 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:35,673 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:35,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94564202] [2021-11-23 02:50:35,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94564202] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:35,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777879165] [2021-11-23 02:50:35,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:35,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:35,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:35,681 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:35,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:50:35,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:35,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:50:35,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:35,776 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 [2021-11-23 02:50:35,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:50:36,038 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:36,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-23 02:50:36,622 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:50:36,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 32 [2021-11-23 02:50:36,634 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:36,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:36,890 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 52 treesize of output 48 [2021-11-23 02:50:37,128 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:37,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777879165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:50:37,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604795634] [2021-11-23 02:50:37,130 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:50:37,130 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:50:37,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:50:37,131 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:50:37,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:50:37,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:37,154 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 [2021-11-23 02:50:37,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:37,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:37,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:50:37,367 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:50:37,367 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 87 treesize of output 86 [2021-11-23 02:50:37,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:37,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:50:37,518 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:37,518 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 [2021-11-23 02:50:38,488 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:43,916 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7224#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)))' at error location [2021-11-23 02:50:43,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:50:43,917 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:50:43,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 23 [2021-11-23 02:50:43,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162949243] [2021-11-23 02:50:43,917 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:50:43,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:50:43,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:43,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:50:43,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1410, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:50:43,919 INFO L87 Difference]: Start difference. First operand 130 states and 154 transitions. Second operand has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:44,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:44,239 INFO L93 Difference]: Finished difference Result 135 states and 158 transitions. [2021-11-23 02:50:44,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:50:44,240 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 0 states have call successors, (0), 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 27 [2021-11-23 02:50:44,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:44,240 INFO L225 Difference]: With dead ends: 135 [2021-11-23 02:50:44,240 INFO L226 Difference]: Without dead ends: 95 [2021-11-23 02:50:44,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=220, Invalid=1942, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:50:44,242 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 22 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:44,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 467 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 214 Invalid, 0 Unknown, 96 Unchecked, 0.1s Time] [2021-11-23 02:50:44,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-23 02:50:44,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-11-23 02:50:44,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 87 states have (on average 1.2873563218390804) internal successors, (112), 93 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) [2021-11-23 02:50:44,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 112 transitions. [2021-11-23 02:50:44,246 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 112 transitions. Word has length 27 [2021-11-23 02:50:44,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:44,246 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 112 transitions. [2021-11-23 02:50:44,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:44,247 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 112 transitions. [2021-11-23 02:50:44,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:50:44,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:44,247 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:44,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:44,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 02:50:44,457 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:44,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:44,458 INFO L85 PathProgramCache]: Analyzing trace with hash 2141288174, now seen corresponding path program 3 times [2021-11-23 02:50:44,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:44,458 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125580737] [2021-11-23 02:50:44,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:44,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:44,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:44,855 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:44,855 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:44,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125580737] [2021-11-23 02:50:44,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125580737] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:44,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842512095] [2021-11-23 02:50:44,856 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:50:44,856 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:44,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:44,857 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:44,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:50:44,949 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:50:44,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:50:44,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-23 02:50:44,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:45,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:50:45,223 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-23 02:50:45,223 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 30 treesize of output 29 [2021-11-23 02:50:45,584 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 21 treesize of output 13 [2021-11-23 02:50:45,592 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:45,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:50:47,800 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse0 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (or (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse0) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)) 0))))) is different from false [2021-11-23 02:50:47,821 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-23 02:50:47,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 87 [2021-11-23 02:50:47,828 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:50:47,829 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 51 treesize of output 53 [2021-11-23 02:50:47,858 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 27 treesize of output 23 [2021-11-23 02:50:47,870 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-23 02:50:47,870 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 17 treesize of output 8 [2021-11-23 02:50:48,062 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:50:48,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842512095] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:50:48,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1168310071] [2021-11-23 02:50:48,064 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:50:48,065 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:50:48,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:50:48,065 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:50:48,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:50:48,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:48,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:50:48,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:48,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:48,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:50:48,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:50:48,293 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 91 treesize of output 83 [2021-11-23 02:50:48,345 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 23 treesize of output 19 [2021-11-23 02:50:48,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:50:48,416 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:50:48,416 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 [2021-11-23 02:50:49,211 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:50:55,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7686#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:50:55,360 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:50:55,360 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:50:55,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 34 [2021-11-23 02:50:55,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908342135] [2021-11-23 02:50:55,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:50:55,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 02:50:55,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:55,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 02:50:55,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=2349, Unknown=1, NotChecked=98, Total=2652 [2021-11-23 02:50:55,363 INFO L87 Difference]: Start difference. First operand 94 states and 112 transitions. Second operand has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 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) [2021-11-23 02:50:57,682 WARN L838 $PredicateComparison]: unable to prove that (and (< 1 |c_ULTIMATE.start_main_~length1~0#1|) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2) (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) 0))) (<= |c_ULTIMATE.start_main_~length1~0#1| 2) (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) 1) 0) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse0 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (or (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse0) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0) (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)) 0))))) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= 2 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|))) is different from false [2021-11-23 02:50:57,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:57,895 INFO L93 Difference]: Finished difference Result 146 states and 172 transitions. [2021-11-23 02:50:57,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:50:57,896 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 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 29 [2021-11-23 02:50:57,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:57,897 INFO L225 Difference]: With dead ends: 146 [2021-11-23 02:50:57,897 INFO L226 Difference]: Without dead ends: 126 [2021-11-23 02:50:57,899 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 845 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=258, Invalid=3054, Unknown=2, NotChecked=226, Total=3540 [2021-11-23 02:50:57,900 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 44 mSDsluCounter, 549 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 493 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:57,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 493 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 335 Invalid, 0 Unknown, 63 Unchecked, 0.2s Time] [2021-11-23 02:50:57,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-23 02:50:57,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-11-23 02:50:57,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 118 states have (on average 1.2457627118644068) internal successors, (147), 124 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:57,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 147 transitions. [2021-11-23 02:50:57,917 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 147 transitions. Word has length 29 [2021-11-23 02:50:57,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:57,917 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 147 transitions. [2021-11-23 02:50:57,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9714285714285715) internal successors, (69), 34 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) [2021-11-23 02:50:57,918 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 147 transitions. [2021-11-23 02:50:57,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 02:50:57,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:57,919 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:57,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:58,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:58,145 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:50:58,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:58,146 INFO L85 PathProgramCache]: Analyzing trace with hash 1537708518, now seen corresponding path program 2 times [2021-11-23 02:50:58,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:58,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902655528] [2021-11-23 02:50:58,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:58,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:58,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:58,268 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:50:58,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:58,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902655528] [2021-11-23 02:50:58,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902655528] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:58,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102116027] [2021-11-23 02:50:58,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:50:58,269 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:58,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:58,273 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:58,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:50:58,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:50:58,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:50:58,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 02:50:58,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:58,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-23 02:50:58,511 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-23 02:50:58,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2021-11-23 02:50:58,906 INFO L354 Elim1Store]: treesize reduction 48, result has 34.2 percent of original size [2021-11-23 02:50:58,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 41 treesize of output 45 [2021-11-23 02:50:59,083 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:50:59,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:00,758 INFO L354 Elim1Store]: treesize reduction 23, result has 46.5 percent of original size [2021-11-23 02:51:00,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 228 treesize of output 195 [2021-11-23 02:51:00,769 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:51:00,769 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 93 treesize of output 91 [2021-11-23 02:51:00,773 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 91 treesize of output 87 [2021-11-23 02:51:00,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:00,800 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 [2021-11-23 02:51:00,843 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:00,855 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:51:00,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 53 [2021-11-23 02:51:01,053 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:51:01,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102116027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:01,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1711251121] [2021-11-23 02:51:01,055 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:51:01,056 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:01,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:01,056 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:01,057 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:01,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:01,093 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 [2021-11-23 02:51:01,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:51:01,171 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 23 treesize of output 19 [2021-11-23 02:51:01,202 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 23 treesize of output 19 [2021-11-23 02:51:01,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:01,266 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 91 treesize of output 83 [2021-11-23 02:51:01,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:51:01,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:51:01,394 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:01,394 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 [2021-11-23 02:51:02,190 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:06,963 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8185#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)))' at error location [2021-11-23 02:51:06,963 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:06,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:06,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 25 [2021-11-23 02:51:06,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371109177] [2021-11-23 02:51:06,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:06,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:51:06,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:06,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:51:06,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=1567, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:51:06,965 INFO L87 Difference]: Start difference. First operand 125 states and 147 transitions. Second operand has 27 states, 26 states have (on average 2.6153846153846154) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:07,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:07,262 INFO L93 Difference]: Finished difference Result 147 states and 172 transitions. [2021-11-23 02:51:07,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:51:07,263 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.6153846153846154) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 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 29 [2021-11-23 02:51:07,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:07,264 INFO L225 Difference]: With dead ends: 147 [2021-11-23 02:51:07,264 INFO L226 Difference]: Without dead ends: 147 [2021-11-23 02:51:07,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=313, Invalid=2137, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:51:07,265 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 102 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:07,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 296 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 261 Invalid, 0 Unknown, 98 Unchecked, 0.1s Time] [2021-11-23 02:51:07,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-23 02:51:07,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 134. [2021-11-23 02:51:07,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 127 states have (on average 1.2992125984251968) internal successors, (165), 133 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:07,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 165 transitions. [2021-11-23 02:51:07,289 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 165 transitions. Word has length 29 [2021-11-23 02:51:07,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:07,289 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 165 transitions. [2021-11-23 02:51:07,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.6153846153846154) internal successors, (68), 26 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:07,289 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 165 transitions. [2021-11-23 02:51:07,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 02:51:07,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:07,290 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:07,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:07,493 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-23 02:51:07,493 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:07,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:07,494 INFO L85 PathProgramCache]: Analyzing trace with hash 2084865842, now seen corresponding path program 4 times [2021-11-23 02:51:07,494 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:07,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111629802] [2021-11-23 02:51:07,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:07,494 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:07,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:07,606 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:07,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111629802] [2021-11-23 02:51:07,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111629802] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:07,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480356922] [2021-11-23 02:51:07,606 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:51:07,606 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:07,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:07,607 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:07,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:51:07,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:07,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 02:51:07,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:07,679 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:51:07,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:51:07,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:51:07,967 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:07,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:08,331 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:08,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480356922] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:08,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535996116] [2021-11-23 02:51:08,333 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:51:08,333 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:08,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:08,333 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:08,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:08,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:08,371 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 [2021-11-23 02:51:08,408 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 20 treesize of output 16 [2021-11-23 02:51:08,442 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 23 treesize of output 19 [2021-11-23 02:51:08,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:51:08,522 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:51:08,522 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 87 treesize of output 86 [2021-11-23 02:51:08,564 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 23 treesize of output 19 [2021-11-23 02:51:08,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:51:08,614 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:08,614 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 [2021-11-23 02:51:09,364 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:15,714 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8708#(and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_#res#1|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= |ULTIMATE.start_cstrstr_~len~0#1| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_cstrstr_~len~0#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrlen_#res#1| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (<= 0 |#NULL.offset|) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2021-11-23 02:51:15,714 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:15,714 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:15,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2021-11-23 02:51:15,714 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571278274] [2021-11-23 02:51:15,714 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:15,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:51:15,715 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:15,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:51:15,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=1844, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:51:15,716 INFO L87 Difference]: Start difference. First operand 134 states and 165 transitions. Second operand has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 28 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:16,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:16,368 INFO L93 Difference]: Finished difference Result 219 states and 267 transitions. [2021-11-23 02:51:16,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:51:16,369 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 28 states have internal predecessors, (87), 0 states have call successors, (0), 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 31 [2021-11-23 02:51:16,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:16,370 INFO L225 Difference]: With dead ends: 219 [2021-11-23 02:51:16,370 INFO L226 Difference]: Without dead ends: 219 [2021-11-23 02:51:16,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=407, Invalid=2785, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 02:51:16,372 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 357 mSDsluCounter, 551 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:16,372 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 520 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:51:16,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-23 02:51:16,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 167. [2021-11-23 02:51:16,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 160 states have (on average 1.33125) internal successors, (213), 166 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:16,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 213 transitions. [2021-11-23 02:51:16,380 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 213 transitions. Word has length 31 [2021-11-23 02:51:16,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:16,381 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 213 transitions. [2021-11-23 02:51:16,381 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 28 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:16,381 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 213 transitions. [2021-11-23 02:51:16,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 02:51:16,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:16,382 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:16,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:16,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:16,583 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:16,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:16,583 INFO L85 PathProgramCache]: Analyzing trace with hash 267880939, now seen corresponding path program 1 times [2021-11-23 02:51:16,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:16,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987053530] [2021-11-23 02:51:16,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:16,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:16,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:16,741 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:16,741 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:16,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987053530] [2021-11-23 02:51:16,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987053530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:16,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912885486] [2021-11-23 02:51:16,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:16,742 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:16,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:16,749 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:16,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:51:16,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:16,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:51:16,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:16,976 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:16,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:17,128 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 [2021-11-23 02:51:17,156 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:17,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912885486] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:17,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147414003] [2021-11-23 02:51:17,157 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-23 02:51:17,158 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:17,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:17,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:17,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:17,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:17,184 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 [2021-11-23 02:51:17,226 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 23 treesize of output 19 [2021-11-23 02:51:17,256 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 23 treesize of output 19 [2021-11-23 02:51:17,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:51:17,337 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:51:17,337 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 87 treesize of output 86 [2021-11-23 02:51:17,384 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 23 treesize of output 19 [2021-11-23 02:51:17,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:51:17,466 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:17,467 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 [2021-11-23 02:51:17,814 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:22,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9335#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrncmp_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (= |ULTIMATE.start_cstrncmp_#in~s2#1.base| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~post5#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#t~post5#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= 0 |#NULL.offset|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (= (+ |ULTIMATE.start_cstrncmp_#t~post5#1.offset| 1) |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:22,660 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:22,660 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:22,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 21 [2021-11-23 02:51:22,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230399643] [2021-11-23 02:51:22,661 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:22,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:51:22,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:22,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:51:22,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1365, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:51:22,662 INFO L87 Difference]: Start difference. First operand 167 states and 213 transitions. Second operand has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 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) [2021-11-23 02:51:23,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:23,388 INFO L93 Difference]: Finished difference Result 324 states and 410 transitions. [2021-11-23 02:51:23,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:51:23,389 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 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 31 [2021-11-23 02:51:23,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:23,391 INFO L225 Difference]: With dead ends: 324 [2021-11-23 02:51:23,391 INFO L226 Difference]: Without dead ends: 324 [2021-11-23 02:51:23,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=473, Invalid=2497, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 02:51:23,393 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 399 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 401 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 399 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 401 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:23,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [399 Valid, 283 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 401 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:51:23,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-23 02:51:23,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 243. [2021-11-23 02:51:23,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 236 states have (on average 1.4194915254237288) internal successors, (335), 242 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) [2021-11-23 02:51:23,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 335 transitions. [2021-11-23 02:51:23,401 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 335 transitions. Word has length 31 [2021-11-23 02:51:23,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:23,402 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 335 transitions. [2021-11-23 02:51:23,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 22 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) [2021-11-23 02:51:23,402 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 335 transitions. [2021-11-23 02:51:23,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:51:23,403 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:23,403 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:23,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:23,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-23 02:51:23,613 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:23,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:23,613 INFO L85 PathProgramCache]: Analyzing trace with hash 206291110, now seen corresponding path program 1 times [2021-11-23 02:51:23,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:23,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637303263] [2021-11-23 02:51:23,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:23,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:23,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:23,724 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:23,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:23,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637303263] [2021-11-23 02:51:23,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637303263] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:23,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58304470] [2021-11-23 02:51:23,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:23,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:23,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:23,725 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:23,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 02:51:23,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:23,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 02:51:23,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:23,798 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:51:23,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:51:23,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:51:24,131 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:24,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:24,433 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:24,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58304470] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:24,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [738893828] [2021-11-23 02:51:24,435 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-23 02:51:24,436 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:24,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:24,436 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:24,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:24,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,472 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 [2021-11-23 02:51:24,503 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 20 treesize of output 16 [2021-11-23 02:51:24,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:51:24,568 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 20 treesize of output 16 [2021-11-23 02:51:24,644 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:51:24,644 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 87 treesize of output 86 [2021-11-23 02:51:24,695 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 23 treesize of output 19 [2021-11-23 02:51:24,724 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 [2021-11-23 02:51:24,770 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:24,771 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 [2021-11-23 02:51:25,136 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:29,396 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10165#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:29,396 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:29,397 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:29,397 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2021-11-23 02:51:29,397 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645314810] [2021-11-23 02:51:29,401 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:29,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:51:29,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:29,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:51:29,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2094, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 02:51:29,405 INFO L87 Difference]: Start difference. First operand 243 states and 335 transitions. Second operand has 29 states, 28 states have (on average 3.2142857142857144) internal successors, (90), 28 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:30,303 INFO L93 Difference]: Finished difference Result 391 states and 508 transitions. [2021-11-23 02:51:30,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:51:30,304 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.2142857142857144) internal successors, (90), 28 states have internal predecessors, (90), 0 states have call successors, (0), 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 [2021-11-23 02:51:30,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:30,306 INFO L225 Difference]: With dead ends: 391 [2021-11-23 02:51:30,307 INFO L226 Difference]: Without dead ends: 391 [2021-11-23 02:51:30,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 918 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=484, Invalid=3298, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 02:51:30,308 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 668 mSDsluCounter, 578 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 668 SdHoareTripleChecker+Valid, 555 SdHoareTripleChecker+Invalid, 823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:30,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [668 Valid, 555 Invalid, 823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:51:30,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-23 02:51:30,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 235. [2021-11-23 02:51:30,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 235 states, 228 states have (on average 1.4166666666666667) internal successors, (323), 234 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 323 transitions. [2021-11-23 02:51:30,318 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 323 transitions. Word has length 32 [2021-11-23 02:51:30,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:30,318 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 323 transitions. [2021-11-23 02:51:30,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.2142857142857144) internal successors, (90), 28 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,319 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 323 transitions. [2021-11-23 02:51:30,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:51:30,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:30,320 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:30,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-23 02:51:30,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-23 02:51:30,545 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:30,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:30,546 INFO L85 PathProgramCache]: Analyzing trace with hash -264452917, now seen corresponding path program 1 times [2021-11-23 02:51:30,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:30,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833388483] [2021-11-23 02:51:30,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:30,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:30,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:30,603 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:51:30,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:30,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833388483] [2021-11-23 02:51:30,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833388483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:30,604 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:30,604 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:51:30,604 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147378921] [2021-11-23 02:51:30,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:30,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:51:30,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:30,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:51:30,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:51:30,606 INFO L87 Difference]: Start difference. First operand 235 states and 323 transitions. Second operand has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:30,683 INFO L93 Difference]: Finished difference Result 260 states and 346 transitions. [2021-11-23 02:51:30,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:51:30,693 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 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 33 [2021-11-23 02:51:30,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:30,695 INFO L225 Difference]: With dead ends: 260 [2021-11-23 02:51:30,695 INFO L226 Difference]: Without dead ends: 260 [2021-11-23 02:51:30,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:51:30,696 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 82 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:30,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 60 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:30,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-23 02:51:30,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 234. [2021-11-23 02:51:30,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 228 states have (on average 1.381578947368421) internal successors, (315), 233 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 315 transitions. [2021-11-23 02:51:30,706 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 315 transitions. Word has length 33 [2021-11-23 02:51:30,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:30,706 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 315 transitions. [2021-11-23 02:51:30,706 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,706 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 315 transitions. [2021-11-23 02:51:30,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:51:30,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:30,708 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:30,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2021-11-23 02:51:30,709 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:30,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:30,709 INFO L85 PathProgramCache]: Analyzing trace with hash -264452916, now seen corresponding path program 1 times [2021-11-23 02:51:30,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:30,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554398153] [2021-11-23 02:51:30,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:30,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:30,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:30,802 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:51:30,803 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:30,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554398153] [2021-11-23 02:51:30,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554398153] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:30,803 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:30,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:51:30,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015386479] [2021-11-23 02:51:30,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:30,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:51:30,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:30,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:51:30,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:51:30,806 INFO L87 Difference]: Start difference. First operand 234 states and 315 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:30,948 INFO L93 Difference]: Finished difference Result 296 states and 379 transitions. [2021-11-23 02:51:30,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:51:30,948 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 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 33 [2021-11-23 02:51:30,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:30,950 INFO L225 Difference]: With dead ends: 296 [2021-11-23 02:51:30,950 INFO L226 Difference]: Without dead ends: 296 [2021-11-23 02:51:30,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:51:30,951 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 58 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:30,952 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 125 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:30,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-23 02:51:30,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 233. [2021-11-23 02:51:30,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 228 states have (on average 1.3464912280701755) internal successors, (307), 232 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 307 transitions. [2021-11-23 02:51:30,965 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 307 transitions. Word has length 33 [2021-11-23 02:51:30,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:30,966 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 307 transitions. [2021-11-23 02:51:30,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:30,966 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 307 transitions. [2021-11-23 02:51:30,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:51:30,967 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:30,967 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:30,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-23 02:51:30,967 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:30,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:30,968 INFO L85 PathProgramCache]: Analyzing trace with hash 1032420846, now seen corresponding path program 3 times [2021-11-23 02:51:30,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:30,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897232791] [2021-11-23 02:51:30,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:30,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:30,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:31,312 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:51:31,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:31,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897232791] [2021-11-23 02:51:31,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897232791] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:31,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794641979] [2021-11-23 02:51:31,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:51:31,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:31,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:31,314 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:31,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 02:51:31,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:51:31,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:31,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-23 02:51:31,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:31,421 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 [2021-11-23 02:51:31,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:51:31,787 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-23 02:51:31,787 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 34 treesize of output 33 [2021-11-23 02:51:32,199 INFO L354 Elim1Store]: treesize reduction 38, result has 7.3 percent of original size [2021-11-23 02:51:32,199 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 36 treesize of output 23 [2021-11-23 02:51:32,206 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:51:32,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:33,410 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2021-11-23 02:51:33,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:51:33,581 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:51:33,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794641979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:33,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [415525975] [2021-11-23 02:51:33,583 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:51:33,583 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:33,584 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:33,584 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:33,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:33,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,620 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 [2021-11-23 02:51:33,658 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 23 treesize of output 19 [2021-11-23 02:51:33,690 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 23 treesize of output 19 [2021-11-23 02:51:33,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:51:33,776 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:51:33,777 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 87 treesize of output 86 [2021-11-23 02:51:33,834 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 23 treesize of output 19 [2021-11-23 02:51:33,870 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 [2021-11-23 02:51:33,967 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:33,967 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 [2021-11-23 02:51:34,666 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:39,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12117#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)))' at error location [2021-11-23 02:51:39,483 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:39,483 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:39,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 11] total 31 [2021-11-23 02:51:39,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192415989] [2021-11-23 02:51:39,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:39,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:51:39,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:39,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:51:39,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1901, Unknown=1, NotChecked=88, Total=2162 [2021-11-23 02:51:39,485 INFO L87 Difference]: Start difference. First operand 233 states and 307 transitions. Second operand has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 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) [2021-11-23 02:51:41,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:41,453 INFO L93 Difference]: Finished difference Result 243 states and 317 transitions. [2021-11-23 02:51:41,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:51:41,453 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 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 33 [2021-11-23 02:51:41,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:41,455 INFO L225 Difference]: With dead ends: 243 [2021-11-23 02:51:41,455 INFO L226 Difference]: Without dead ends: 240 [2021-11-23 02:51:41,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=211, Invalid=2242, Unknown=1, NotChecked=96, Total=2550 [2021-11-23 02:51:41,456 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 25 mSDsluCounter, 791 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:41,456 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 676 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 385 Invalid, 0 Unknown, 110 Unchecked, 0.2s Time] [2021-11-23 02:51:41,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-11-23 02:51:41,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2021-11-23 02:51:41,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 233 states have (on average 1.3390557939914163) internal successors, (312), 237 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:41,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 312 transitions. [2021-11-23 02:51:41,463 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 312 transitions. Word has length 33 [2021-11-23 02:51:41,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:41,463 INFO L470 AbstractCegarLoop]: Abstraction has 238 states and 312 transitions. [2021-11-23 02:51:41,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.375) internal successors, (76), 31 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) [2021-11-23 02:51:41,464 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 312 transitions. [2021-11-23 02:51:41,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:51:41,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:41,465 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:41,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:41,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-23 02:51:41,666 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:41,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:41,666 INFO L85 PathProgramCache]: Analyzing trace with hash 391886083, now seen corresponding path program 1 times [2021-11-23 02:51:41,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:41,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861730978] [2021-11-23 02:51:41,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:41,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:41,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:41,708 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:51:41,708 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:41,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861730978] [2021-11-23 02:51:41,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861730978] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:41,709 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:41,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:51:41,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382787789] [2021-11-23 02:51:41,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:41,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:51:41,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:41,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:51:41,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:51:41,712 INFO L87 Difference]: Start difference. First operand 238 states and 312 transitions. Second operand has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:41,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:41,789 INFO L93 Difference]: Finished difference Result 273 states and 346 transitions. [2021-11-23 02:51:41,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:51:41,790 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 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 [2021-11-23 02:51:41,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:41,792 INFO L225 Difference]: With dead ends: 273 [2021-11-23 02:51:41,792 INFO L226 Difference]: Without dead ends: 273 [2021-11-23 02:51:41,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:51:41,793 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 22 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:41,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 109 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:41,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2021-11-23 02:51:41,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 237. [2021-11-23 02:51:41,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 233 states have (on average 1.3175965665236051) internal successors, (307), 236 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:41,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 307 transitions. [2021-11-23 02:51:41,802 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 307 transitions. Word has length 34 [2021-11-23 02:51:41,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:41,802 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 307 transitions. [2021-11-23 02:51:41,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 6.75) internal successors, (27), 5 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:41,803 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 307 transitions. [2021-11-23 02:51:41,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:51:41,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:41,804 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:41,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2021-11-23 02:51:41,804 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:41,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:41,805 INFO L85 PathProgramCache]: Analyzing trace with hash 391886084, now seen corresponding path program 1 times [2021-11-23 02:51:41,805 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:41,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883243740] [2021-11-23 02:51:41,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:41,806 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:41,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:42,007 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:42,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:42,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883243740] [2021-11-23 02:51:42,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883243740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:42,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218084840] [2021-11-23 02:51:42,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:42,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:42,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:42,009 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:42,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 02:51:42,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:42,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:51:42,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:42,314 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:42,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:42,564 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 [2021-11-23 02:51:42,594 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:42,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218084840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:42,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1273334801] [2021-11-23 02:51:42,596 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 02:51:42,596 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:42,597 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:42,597 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:42,597 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:42,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:42,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:51:42,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:51:42,679 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 23 treesize of output 19 [2021-11-23 02:51:42,707 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 23 treesize of output 19 [2021-11-23 02:51:42,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:42,747 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 91 treesize of output 83 [2021-11-23 02:51:42,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:51:42,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:51:42,834 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:42,834 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 [2021-11-23 02:51:43,249 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:49,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1273334801] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:49,320 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:49,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [10, 10, 10] total 44 [2021-11-23 02:51:49,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067305080] [2021-11-23 02:51:49,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:49,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:51:49,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:49,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:51:49,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:51:49,323 INFO L87 Difference]: Start difference. First operand 237 states and 307 transitions. Second operand has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:56,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:56,073 INFO L93 Difference]: Finished difference Result 285 states and 363 transitions. [2021-11-23 02:51:56,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:51:56,074 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 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 [2021-11-23 02:51:56,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:56,076 INFO L225 Difference]: With dead ends: 285 [2021-11-23 02:51:56,076 INFO L226 Difference]: Without dead ends: 285 [2021-11-23 02:51:56,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=412, Invalid=2780, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 02:51:56,077 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 98 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:56,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 201 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:51:56,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2021-11-23 02:51:56,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 246. [2021-11-23 02:51:56,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 242 states have (on average 1.3140495867768596) internal successors, (318), 245 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:56,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 318 transitions. [2021-11-23 02:51:56,085 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 318 transitions. Word has length 34 [2021-11-23 02:51:56,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:56,086 INFO L470 AbstractCegarLoop]: Abstraction has 246 states and 318 transitions. [2021-11-23 02:51:56,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:56,086 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 318 transitions. [2021-11-23 02:51:56,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 02:51:56,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:56,087 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:56,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:56,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-23 02:51:56,305 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:51:56,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:56,306 INFO L85 PathProgramCache]: Analyzing trace with hash 819129658, now seen corresponding path program 5 times [2021-11-23 02:51:56,306 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:56,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773350832] [2021-11-23 02:51:56,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:56,306 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:56,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:56,937 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:56,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:56,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773350832] [2021-11-23 02:51:56,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773350832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:56,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314424364] [2021-11-23 02:51:56,941 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:56,941 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:56,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:56,942 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:56,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 02:51:57,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:51:57,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:57,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-23 02:51:57,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:57,052 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 [2021-11-23 02:51:57,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:51:57,342 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:51:57,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:51:57,926 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:51:57,927 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 38 treesize of output 23 [2021-11-23 02:51:57,936 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:51:57,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:03,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:52:04,128 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:52:04,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314424364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:04,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335299600] [2021-11-23 02:52:04,130 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:52:04,130 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:04,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:04,131 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:04,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:04,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,160 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 [2021-11-23 02:52:04,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:04,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:04,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:52:04,340 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:52:04,340 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 87 treesize of output 86 [2021-11-23 02:52:04,396 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 23 treesize of output 19 [2021-11-23 02:52:04,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:52:04,486 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:04,486 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 [2021-11-23 02:52:04,926 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:10,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14181#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:52:10,142 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:10,142 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:10,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 13, 13] total 37 [2021-11-23 02:52:10,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294812299] [2021-11-23 02:52:10,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:10,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:52:10,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:10,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:52:10,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=2748, Unknown=5, NotChecked=0, Total=2970 [2021-11-23 02:52:10,144 INFO L87 Difference]: Start difference. First operand 246 states and 318 transitions. Second operand has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:12,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:12,208 INFO L93 Difference]: Finished difference Result 470 states and 611 transitions. [2021-11-23 02:52:12,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 02:52:12,208 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 0 states have call successors, (0), 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 35 [2021-11-23 02:52:12,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:12,213 INFO L225 Difference]: With dead ends: 470 [2021-11-23 02:52:12,213 INFO L226 Difference]: Without dead ends: 464 [2021-11-23 02:52:12,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1720 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=514, Invalid=6287, Unknown=5, NotChecked=0, Total=6806 [2021-11-23 02:52:12,214 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 196 mSDsluCounter, 1348 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 1236 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 205 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:12,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 1236 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 543 Invalid, 0 Unknown, 205 Unchecked, 0.3s Time] [2021-11-23 02:52:12,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-11-23 02:52:12,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 303. [2021-11-23 02:52:12,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 299 states have (on average 1.2876254180602007) internal successors, (385), 302 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:12,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 385 transitions. [2021-11-23 02:52:12,225 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 385 transitions. Word has length 35 [2021-11-23 02:52:12,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:12,226 INFO L470 AbstractCegarLoop]: Abstraction has 303 states and 385 transitions. [2021-11-23 02:52:12,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:12,226 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 385 transitions. [2021-11-23 02:52:12,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 02:52:12,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:12,227 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:12,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:12,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-23 02:52:12,441 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:12,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:12,441 INFO L85 PathProgramCache]: Analyzing trace with hash -1925173448, now seen corresponding path program 1 times [2021-11-23 02:52:12,442 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:12,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250987480] [2021-11-23 02:52:12,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:12,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:12,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:12,617 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:52:12,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:12,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250987480] [2021-11-23 02:52:12,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250987480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:12,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586476625] [2021-11-23 02:52:12,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:12,618 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:12,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:12,619 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:12,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 02:52:12,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:12,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 02:52:12,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:12,949 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:52:12,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:13,214 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 [2021-11-23 02:52:13,231 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:52:13,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1586476625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:13,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [81309251] [2021-11-23 02:52:13,233 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 02:52:13,233 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:13,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:13,234 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:13,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:13,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:13,267 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 [2021-11-23 02:52:13,312 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 23 treesize of output 19 [2021-11-23 02:52:13,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:13,385 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 20 treesize of output 16 [2021-11-23 02:52:13,441 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:52:13,441 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 87 treesize of output 86 [2021-11-23 02:52:13,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:13,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:52:13,579 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:13,579 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 [2021-11-23 02:52:14,158 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:20,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [81309251] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:52:20,331 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:20,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [9, 9, 9] total 43 [2021-11-23 02:52:20,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348955035] [2021-11-23 02:52:20,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:52:20,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:52:20,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:20,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:52:20,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1621, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:52:20,333 INFO L87 Difference]: Start difference. First operand 303 states and 385 transitions. Second operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:24,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:24,922 INFO L93 Difference]: Finished difference Result 413 states and 518 transitions. [2021-11-23 02:52:24,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:52:24,923 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 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 36 [2021-11-23 02:52:24,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:24,925 INFO L225 Difference]: With dead ends: 413 [2021-11-23 02:52:24,925 INFO L226 Difference]: Without dead ends: 413 [2021-11-23 02:52:24,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=425, Invalid=2437, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:52:24,926 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 196 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 538 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:24,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 225 Invalid, 538 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:52:24,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-11-23 02:52:24,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 370. [2021-11-23 02:52:24,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 366 states have (on average 1.3114754098360655) internal successors, (480), 369 states have internal predecessors, (480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:24,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 480 transitions. [2021-11-23 02:52:24,936 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 480 transitions. Word has length 36 [2021-11-23 02:52:24,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:24,936 INFO L470 AbstractCegarLoop]: Abstraction has 370 states and 480 transitions. [2021-11-23 02:52:24,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:24,936 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 480 transitions. [2021-11-23 02:52:24,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 02:52:24,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:24,938 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:24,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:25,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-23 02:52:25,161 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:25,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:25,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1346682423, now seen corresponding path program 1 times [2021-11-23 02:52:25,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:25,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969632460] [2021-11-23 02:52:25,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:25,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:25,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:25,280 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:52:25,281 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:25,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969632460] [2021-11-23 02:52:25,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969632460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:25,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855365812] [2021-11-23 02:52:25,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:25,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:25,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:25,283 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:25,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 02:52:25,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:25,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 02:52:25,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:25,402 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 [2021-11-23 02:52:25,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:52:25,659 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:25,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:52:26,302 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:52:26,302 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 38 treesize of output 23 [2021-11-23 02:52:26,334 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:52:26,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:32,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:52:32,397 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:52:32,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1855365812] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:32,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1136576563] [2021-11-23 02:52:32,399 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:52:32,399 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:32,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:32,399 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:32,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:32,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:32,435 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 [2021-11-23 02:52:32,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:52:32,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:32,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:52:32,596 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:52:32,596 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 87 treesize of output 86 [2021-11-23 02:52:32,646 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 23 treesize of output 19 [2021-11-23 02:52:32,679 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 [2021-11-23 02:52:32,722 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:32,722 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 [2021-11-23 02:52:34,116 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:40,862 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16322#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:52:40,862 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:40,862 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:40,862 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 12] total 28 [2021-11-23 02:52:40,862 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296585708] [2021-11-23 02:52:40,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:40,863 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:52:40,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:40,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:52:40,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2371, Unknown=3, NotChecked=0, Total=2550 [2021-11-23 02:52:40,874 INFO L87 Difference]: Start difference. First operand 370 states and 480 transitions. Second operand has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 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) [2021-11-23 02:52:41,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:41,354 INFO L93 Difference]: Finished difference Result 468 states and 592 transitions. [2021-11-23 02:52:41,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:52:41,359 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 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) Word has length 36 [2021-11-23 02:52:41,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:41,361 INFO L225 Difference]: With dead ends: 468 [2021-11-23 02:52:41,361 INFO L226 Difference]: Without dead ends: 468 [2021-11-23 02:52:41,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=232, Invalid=3425, Unknown=3, NotChecked=0, Total=3660 [2021-11-23 02:52:41,362 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 63 mSDsluCounter, 1088 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 956 SdHoareTripleChecker+Invalid, 664 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:41,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 956 Invalid, 664 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 499 Invalid, 0 Unknown, 160 Unchecked, 0.2s Time] [2021-11-23 02:52:41,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-11-23 02:52:41,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 416. [2021-11-23 02:52:41,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 412 states have (on average 1.3131067961165048) internal successors, (541), 415 states have internal predecessors, (541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:41,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 541 transitions. [2021-11-23 02:52:41,372 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 541 transitions. Word has length 36 [2021-11-23 02:52:41,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:41,372 INFO L470 AbstractCegarLoop]: Abstraction has 416 states and 541 transitions. [2021-11-23 02:52:41,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 3.142857142857143) internal successors, (88), 28 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) [2021-11-23 02:52:41,373 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 541 transitions. [2021-11-23 02:52:41,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 02:52:41,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:41,374 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:41,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:41,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:41,585 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:41,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:41,585 INFO L85 PathProgramCache]: Analyzing trace with hash 1477556862, now seen corresponding path program 6 times [2021-11-23 02:52:41,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:41,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633303620] [2021-11-23 02:52:41,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:41,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:41,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:41,732 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:52:41,732 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:41,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633303620] [2021-11-23 02:52:41,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633303620] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:41,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073771212] [2021-11-23 02:52:41,733 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:52:41,733 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:41,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:41,745 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:41,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 02:52:41,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:52:41,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:52:41,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 02:52:41,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:41,990 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:52:41,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:42,279 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 [2021-11-23 02:52:42,298 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:52:42,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073771212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:42,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2124178841] [2021-11-23 02:52:42,299 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:52:42,300 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:42,300 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:42,300 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:42,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:42,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:42,348 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 [2021-11-23 02:52:42,392 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 23 treesize of output 19 [2021-11-23 02:52:42,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:42,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:42,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:42,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-23 02:52:42,546 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 23 treesize of output 19 [2021-11-23 02:52:42,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:52:42,614 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:42,614 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 [2021-11-23 02:52:43,316 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:48,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17487#(and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (<= 0 |#NULL.offset|) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2021-11-23 02:52:48,196 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:48,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:48,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-11-23 02:52:48,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131637128] [2021-11-23 02:52:48,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:48,197 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:52:48,197 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:48,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:52:48,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1294, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 02:52:48,198 INFO L87 Difference]: Start difference. First operand 416 states and 541 transitions. Second operand has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:48,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:48,853 INFO L93 Difference]: Finished difference Result 809 states and 1073 transitions. [2021-11-23 02:52:48,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:52:48,853 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 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 37 [2021-11-23 02:52:48,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:48,856 INFO L225 Difference]: With dead ends: 809 [2021-11-23 02:52:48,856 INFO L226 Difference]: Without dead ends: 809 [2021-11-23 02:52:48,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=351, Invalid=2301, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:52:48,857 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 549 mSDsluCounter, 785 mSDsCounter, 0 mSdLazyCounter, 937 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 549 SdHoareTripleChecker+Valid, 740 SdHoareTripleChecker+Invalid, 952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 937 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:48,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [549 Valid, 740 Invalid, 952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 937 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:52:48,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 809 states. [2021-11-23 02:52:48,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 809 to 597. [2021-11-23 02:52:48,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 597 states, 593 states have (on average 1.3322091062394603) internal successors, (790), 596 states have internal predecessors, (790), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:48,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 597 states to 597 states and 790 transitions. [2021-11-23 02:52:48,872 INFO L78 Accepts]: Start accepts. Automaton has 597 states and 790 transitions. Word has length 37 [2021-11-23 02:52:48,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:48,873 INFO L470 AbstractCegarLoop]: Abstraction has 597 states and 790 transitions. [2021-11-23 02:52:48,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.1904761904761907) internal successors, (67), 21 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:48,873 INFO L276 IsEmpty]: Start isEmpty. Operand 597 states and 790 transitions. [2021-11-23 02:52:48,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:52:48,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:48,874 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:48,905 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:49,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:49,097 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:49,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:49,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1440418086, now seen corresponding path program 2 times [2021-11-23 02:52:49,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:49,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641892625] [2021-11-23 02:52:49,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:49,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:49,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:49,241 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:52:49,241 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:49,241 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641892625] [2021-11-23 02:52:49,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641892625] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:49,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747064001] [2021-11-23 02:52:49,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:52:49,242 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:49,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:49,243 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:49,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 02:52:49,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-23 02:52:49,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:52:49,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 02:52:49,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:49,416 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 02:52:49,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:52:49,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747064001] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:52:49,416 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:52:49,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 16 [2021-11-23 02:52:49,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95267916] [2021-11-23 02:52:49,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:52:49,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:52:49,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:49,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:52:49,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:52:49,418 INFO L87 Difference]: Start difference. First operand 597 states and 790 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:49,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:49,479 INFO L93 Difference]: Finished difference Result 534 states and 670 transitions. [2021-11-23 02:52:49,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:52:49,479 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 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 38 [2021-11-23 02:52:49,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:49,481 INFO L225 Difference]: With dead ends: 534 [2021-11-23 02:52:49,481 INFO L226 Difference]: Without dead ends: 534 [2021-11-23 02:52:49,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:52:49,482 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 29 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:49,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 108 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:52:49,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-11-23 02:52:49,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 424. [2021-11-23 02:52:49,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 420 states have (on average 1.3) internal successors, (546), 423 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:49,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 546 transitions. [2021-11-23 02:52:49,491 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 546 transitions. Word has length 38 [2021-11-23 02:52:49,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:49,491 INFO L470 AbstractCegarLoop]: Abstraction has 424 states and 546 transitions. [2021-11-23 02:52:49,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:49,492 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 546 transitions. [2021-11-23 02:52:49,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 02:52:49,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:49,493 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:49,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:49,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:49,715 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:49,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:49,715 INFO L85 PathProgramCache]: Analyzing trace with hash 1195821113, now seen corresponding path program 1 times [2021-11-23 02:52:49,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:49,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227326627] [2021-11-23 02:52:49,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:49,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:49,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:49,746 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:52:49,746 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:49,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227326627] [2021-11-23 02:52:49,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227326627] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:52:49,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:52:49,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:52:49,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553392743] [2021-11-23 02:52:49,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:52:49,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:52:49,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:49,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:52:49,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:52:49,749 INFO L87 Difference]: Start difference. First operand 424 states and 546 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 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) [2021-11-23 02:52:49,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:49,786 INFO L93 Difference]: Finished difference Result 430 states and 543 transitions. [2021-11-23 02:52:49,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:52:49,786 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 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) Word has length 38 [2021-11-23 02:52:49,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:49,788 INFO L225 Difference]: With dead ends: 430 [2021-11-23 02:52:49,788 INFO L226 Difference]: Without dead ends: 366 [2021-11-23 02:52:49,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:52:49,791 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:49,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 77 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:52:49,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-11-23 02:52:49,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 366. [2021-11-23 02:52:49,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 362 states have (on average 1.201657458563536) internal successors, (435), 365 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:49,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 435 transitions. [2021-11-23 02:52:49,800 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 435 transitions. Word has length 38 [2021-11-23 02:52:49,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:49,800 INFO L470 AbstractCegarLoop]: Abstraction has 366 states and 435 transitions. [2021-11-23 02:52:49,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 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) [2021-11-23 02:52:49,801 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 435 transitions. [2021-11-23 02:52:49,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 02:52:49,801 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:49,802 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:49,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2021-11-23 02:52:49,802 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:49,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:49,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1748585926, now seen corresponding path program 4 times [2021-11-23 02:52:49,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:49,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118356140] [2021-11-23 02:52:49,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:49,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:49,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:50,105 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:52:50,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:50,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118356140] [2021-11-23 02:52:50,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118356140] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:50,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739660112] [2021-11-23 02:52:50,106 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:52:50,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:50,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:50,109 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:50,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 02:52:50,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:50,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-23 02:52:50,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:50,200 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 [2021-11-23 02:52:50,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:52:50,486 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:50,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:52:50,985 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:52:50,986 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 38 treesize of output 23 [2021-11-23 02:52:50,992 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:52:50,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:51,753 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0)) is different from false [2021-11-23 02:52:51,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:52:51,943 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:52:51,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739660112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:51,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1685383470] [2021-11-23 02:52:51,944 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:52:51,944 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:51,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:51,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:51,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:51,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:51,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:52:52,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:52:52,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:52,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:52,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:52,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-23 02:52:52,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:52:52,168 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 [2021-11-23 02:52:52,199 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:52:52,200 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 [2021-11-23 02:52:52,855 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:57,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21089#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)))' at error location [2021-11-23 02:52:57,659 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:57,659 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:57,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 33 [2021-11-23 02:52:57,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668437616] [2021-11-23 02:52:57,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:57,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 02:52:57,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:57,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 02:52:57,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2189, Unknown=1, NotChecked=94, Total=2450 [2021-11-23 02:52:57,661 INFO L87 Difference]: Start difference. First operand 366 states and 435 transitions. Second operand has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 33 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) [2021-11-23 02:52:59,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:59,119 INFO L93 Difference]: Finished difference Result 463 states and 547 transitions. [2021-11-23 02:52:59,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:52:59,120 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 33 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) Word has length 39 [2021-11-23 02:52:59,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:59,122 INFO L225 Difference]: With dead ends: 463 [2021-11-23 02:52:59,122 INFO L226 Difference]: Without dead ends: 457 [2021-11-23 02:52:59,122 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=265, Invalid=3398, Unknown=1, NotChecked=118, Total=3782 [2021-11-23 02:52:59,122 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 152 mSDsluCounter, 1180 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 985 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 191 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:59,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 985 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 618 Invalid, 0 Unknown, 191 Unchecked, 0.3s Time] [2021-11-23 02:52:59,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-11-23 02:52:59,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 370. [2021-11-23 02:52:59,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 366 states have (on average 1.1967213114754098) internal successors, (438), 369 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:59,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 438 transitions. [2021-11-23 02:52:59,130 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 438 transitions. Word has length 39 [2021-11-23 02:52:59,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:59,131 INFO L470 AbstractCegarLoop]: Abstraction has 370 states and 438 transitions. [2021-11-23 02:52:59,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.5294117647058822) internal successors, (86), 33 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) [2021-11-23 02:52:59,131 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 438 transitions. [2021-11-23 02:52:59,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 02:52:59,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:59,132 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:52:59,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:59,347 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-23 02:52:59,347 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:52:59,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:59,347 INFO L85 PathProgramCache]: Analyzing trace with hash 80022072, now seen corresponding path program 1 times [2021-11-23 02:52:59,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:59,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299990053] [2021-11-23 02:52:59,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:59,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:59,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:59,515 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:52:59,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:59,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299990053] [2021-11-23 02:52:59,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299990053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:59,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662258259] [2021-11-23 02:52:59,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:59,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:59,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:59,517 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:59,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 02:52:59,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:59,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:52:59,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:59,842 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:52:59,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:00,111 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 [2021-11-23 02:53:00,151 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:53:00,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1662258259] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:00,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1159482836] [2021-11-23 02:53:00,153 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-23 02:53:00,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:53:00,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:53:00,153 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:53:00,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:53:00,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:00,181 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 [2021-11-23 02:53:00,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:00,257 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 23 treesize of output 19 [2021-11-23 02:53:00,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:00,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:00,342 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 91 treesize of output 83 [2021-11-23 02:53:00,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:00,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:53:00,446 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:00,446 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 [2021-11-23 02:53:01,015 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:53:06,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1159482836] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:53:06,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:53:06,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [10, 10, 10] total 45 [2021-11-23 02:53:06,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095216557] [2021-11-23 02:53:06,192 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:53:06,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:53:06,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:53:06,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:53:06,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1809, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:53:06,193 INFO L87 Difference]: Start difference. First operand 370 states and 438 transitions. Second operand has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:12,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:12,347 INFO L93 Difference]: Finished difference Result 401 states and 468 transitions. [2021-11-23 02:53:12,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:53:12,348 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 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 [2021-11-23 02:53:12,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:12,350 INFO L225 Difference]: With dead ends: 401 [2021-11-23 02:53:12,350 INFO L226 Difference]: Without dead ends: 401 [2021-11-23 02:53:12,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=444, Invalid=2862, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 02:53:12,352 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 117 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:12,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 81 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:53:12,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-23 02:53:12,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 365. [2021-11-23 02:53:12,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 361 states have (on average 1.1994459833795015) internal successors, (433), 364 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:12,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 433 transitions. [2021-11-23 02:53:12,361 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 433 transitions. Word has length 40 [2021-11-23 02:53:12,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:12,362 INFO L470 AbstractCegarLoop]: Abstraction has 365 states and 433 transitions. [2021-11-23 02:53:12,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:12,362 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 433 transitions. [2021-11-23 02:53:12,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 02:53:12,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:12,364 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:12,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-23 02:53:12,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:12,589 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:53:12,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:12,589 INFO L85 PathProgramCache]: Analyzing trace with hash 821926534, now seen corresponding path program 7 times [2021-11-23 02:53:12,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:53:12,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040395516] [2021-11-23 02:53:12,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:12,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:53:12,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:12,988 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:53:12,989 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:53:12,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040395516] [2021-11-23 02:53:12,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040395516] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:53:12,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321680597] [2021-11-23 02:53:12,989 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:53:12,989 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:12,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:12,991 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:13,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-23 02:53:13,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:13,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 02:53:13,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:13,081 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 [2021-11-23 02:53:13,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:53:13,404 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:13,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:53:14,094 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:53:14,095 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 38 treesize of output 23 [2021-11-23 02:53:14,103 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:53:14,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:19,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:53:20,228 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:53:20,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321680597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:20,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511465970] [2021-11-23 02:53:20,230 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:53:20,230 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:53:20,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:53:20,231 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:53:20,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:53:20,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:20,261 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 [2021-11-23 02:53:20,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:53:20,348 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 23 treesize of output 19 [2021-11-23 02:53:20,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:20,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:20,437 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 91 treesize of output 83 [2021-11-23 02:53:20,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:20,511 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 [2021-11-23 02:53:20,544 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:20,545 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 [2021-11-23 02:53:21,249 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:53:27,803 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23311#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:53:27,803 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:53:27,803 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:53:27,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 38 [2021-11-23 02:53:27,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628829380] [2021-11-23 02:53:27,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:27,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 02:53:27,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:53:27,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 02:53:27,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=2880, Unknown=6, NotChecked=0, Total=3080 [2021-11-23 02:53:27,804 INFO L87 Difference]: Start difference. First operand 365 states and 433 transitions. Second operand has 39 states, 39 states have (on average 2.4871794871794872) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:28,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:28,833 INFO L93 Difference]: Finished difference Result 688 states and 816 transitions. [2021-11-23 02:53:28,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:53:28,834 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.4871794871794872) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 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 41 [2021-11-23 02:53:28,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:28,838 INFO L225 Difference]: With dead ends: 688 [2021-11-23 02:53:28,838 INFO L226 Difference]: Without dead ends: 665 [2021-11-23 02:53:28,839 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1015 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=308, Invalid=4516, Unknown=6, NotChecked=0, Total=4830 [2021-11-23 02:53:28,839 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 218 mSDsluCounter, 1703 mSDsCounter, 0 mSdLazyCounter, 974 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1387 SdHoareTripleChecker+Invalid, 1229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 974 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 241 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:28,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 1387 Invalid, 1229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 974 Invalid, 0 Unknown, 241 Unchecked, 0.5s Time] [2021-11-23 02:53:28,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-11-23 02:53:28,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 396. [2021-11-23 02:53:28,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 392 states have (on average 1.1938775510204083) internal successors, (468), 395 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:28,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2021-11-23 02:53:28,849 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 41 [2021-11-23 02:53:28,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:28,850 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2021-11-23 02:53:28,850 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.4871794871794872) internal successors, (97), 38 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:28,850 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2021-11-23 02:53:28,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:53:28,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:28,851 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:28,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:29,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-23 02:53:29,065 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:53:29,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:29,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1444008922, now seen corresponding path program 1 times [2021-11-23 02:53:29,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:53:29,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809593335] [2021-11-23 02:53:29,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:29,066 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:53:29,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:29,235 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:53:29,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:53:29,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809593335] [2021-11-23 02:53:29,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809593335] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:53:29,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710567819] [2021-11-23 02:53:29,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:29,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:29,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:29,241 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:29,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 02:53:29,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:29,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-23 02:53:29,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:29,348 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:53:29,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:53:29,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:53:29,878 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 9 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:53:29,878 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 16 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:53:30,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710567819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:30,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715879119] [2021-11-23 02:53:30,344 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-23 02:53:30,344 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:53:30,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:53:30,344 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:53:30,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:53:30,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:30,368 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 [2021-11-23 02:53:30,404 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 23 treesize of output 19 [2021-11-23 02:53:30,451 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 23 treesize of output 19 [2021-11-23 02:53:30,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:30,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:30,530 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 91 treesize of output 83 [2021-11-23 02:53:30,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:30,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:53:30,638 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:30,638 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 [2021-11-23 02:53:31,332 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:53:36,958 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24721#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:53:36,959 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:53:36,959 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:53:36,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2021-11-23 02:53:36,959 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985579500] [2021-11-23 02:53:36,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:36,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 02:53:36,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:53:36,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 02:53:36,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2605, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:53:36,961 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 35 states, 34 states have (on average 3.264705882352941) internal successors, (111), 34 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:38,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:38,146 INFO L93 Difference]: Finished difference Result 537 states and 618 transitions. [2021-11-23 02:53:38,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:53:38,146 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 3.264705882352941) internal successors, (111), 34 states have internal predecessors, (111), 0 states have call successors, (0), 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 [2021-11-23 02:53:38,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:38,148 INFO L225 Difference]: With dead ends: 537 [2021-11-23 02:53:38,148 INFO L226 Difference]: Without dead ends: 537 [2021-11-23 02:53:38,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1203 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=614, Invalid=4356, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 02:53:38,149 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 656 mSDsluCounter, 772 mSDsCounter, 0 mSdLazyCounter, 1226 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 656 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 1275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:38,149 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [656 Valid, 725 Invalid, 1275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1226 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:53:38,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-11-23 02:53:38,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 358. [2021-11-23 02:53:38,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 358 states, 354 states have (on average 1.189265536723164) internal successors, (421), 357 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:38,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 421 transitions. [2021-11-23 02:53:38,156 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 421 transitions. Word has length 42 [2021-11-23 02:53:38,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:38,157 INFO L470 AbstractCegarLoop]: Abstraction has 358 states and 421 transitions. [2021-11-23 02:53:38,157 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 3.264705882352941) internal successors, (111), 34 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:38,157 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 421 transitions. [2021-11-23 02:53:38,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 02:53:38,158 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:38,158 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:38,190 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-23 02:53:38,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-23 02:53:38,381 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:53:38,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:38,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1354927365, now seen corresponding path program 2 times [2021-11-23 02:53:38,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:53:38,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927059753] [2021-11-23 02:53:38,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:38,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:53:38,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:38,505 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:53:38,505 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:53:38,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927059753] [2021-11-23 02:53:38,505 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927059753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:53:38,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594617843] [2021-11-23 02:53:38,505 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:53:38,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:38,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:38,509 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:38,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 02:53:38,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:53:38,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:53:38,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-23 02:53:38,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:38,604 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 [2021-11-23 02:53:38,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-23 02:53:38,769 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:38,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2021-11-23 02:53:39,559 INFO L354 Elim1Store]: treesize reduction 55, result has 19.1 percent of original size [2021-11-23 02:53:39,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 38 [2021-11-23 02:53:39,634 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:53:39,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:40,194 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:53:40,197 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:53:40,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 110 [2021-11-23 02:53:40,206 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 53 treesize of output 45 [2021-11-23 02:53:40,299 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:53:40,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594617843] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:40,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [739645096] [2021-11-23 02:53:40,301 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:53:40,302 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:53:40,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:53:40,302 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:53:40,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:53:40,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:40,344 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 [2021-11-23 02:53:40,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:40,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:40,465 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 23 treesize of output 19 [2021-11-23 02:53:40,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:40,523 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 91 treesize of output 83 [2021-11-23 02:53:40,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:40,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:53:40,644 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:40,644 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 [2021-11-23 02:53:42,283 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:53:51,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25946#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|))))' at error location [2021-11-23 02:53:51,329 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:53:51,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:53:51,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 29 [2021-11-23 02:53:51,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666264255] [2021-11-23 02:53:51,330 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:53:51,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:53:51,330 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:53:51,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:53:51,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=2602, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:53:51,331 INFO L87 Difference]: Start difference. First operand 358 states and 421 transitions. Second operand has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:52,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:53:52,040 INFO L93 Difference]: Finished difference Result 413 states and 479 transitions. [2021-11-23 02:53:52,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 02:53:52,041 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 states have internal predecessors, (91), 0 states have call successors, (0), 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 [2021-11-23 02:53:52,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:53:52,042 INFO L225 Difference]: With dead ends: 413 [2021-11-23 02:53:52,042 INFO L226 Difference]: Without dead ends: 413 [2021-11-23 02:53:52,043 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=358, Invalid=3932, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 02:53:52,043 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 45 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 131 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:53:52,043 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 394 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 289 Invalid, 0 Unknown, 131 Unchecked, 0.2s Time] [2021-11-23 02:53:52,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-11-23 02:53:52,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 380. [2021-11-23 02:53:52,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 376 states have (on average 1.1835106382978724) internal successors, (445), 379 states have internal predecessors, (445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:52,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 445 transitions. [2021-11-23 02:53:52,052 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 445 transitions. Word has length 42 [2021-11-23 02:53:52,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:53:52,053 INFO L470 AbstractCegarLoop]: Abstraction has 380 states and 445 transitions. [2021-11-23 02:53:52,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.033333333333333) internal successors, (91), 30 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:53:52,053 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 445 transitions. [2021-11-23 02:53:52,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:53:52,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:53:52,055 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:53:52,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 02:53:52,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-23 02:53:52,273 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:53:52,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:53:52,273 INFO L85 PathProgramCache]: Analyzing trace with hash -598317878, now seen corresponding path program 8 times [2021-11-23 02:53:52,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:53:52,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703062369] [2021-11-23 02:53:52,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:53:52,274 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:53:52,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:53:52,532 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:53:52,533 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:53:52,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703062369] [2021-11-23 02:53:52,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703062369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:53:52,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888388169] [2021-11-23 02:53:52,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:53:52,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:53:52,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:53:52,534 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:53:52,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-23 02:53:52,650 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:53:52,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:53:52,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 02:53:52,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:53:52,661 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 [2021-11-23 02:53:52,667 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 [2021-11-23 02:53:52,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-23 02:53:52,918 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-23 02:53:52,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 02:53:53,278 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-23 02:53:53,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 24 [2021-11-23 02:53:53,418 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 02:53:53,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:53,960 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 63 treesize of output 59 [2021-11-23 02:53:54,207 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-23 02:53:54,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888388169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:53:54,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848099216] [2021-11-23 02:53:54,208 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:53:54,209 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:53:54,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:53:54,209 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:53:54,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:53:54,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:54,237 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 [2021-11-23 02:53:54,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:53:54,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:54,341 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 23 treesize of output 19 [2021-11-23 02:53:54,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:53:54,404 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 91 treesize of output 83 [2021-11-23 02:53:54,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:53:54,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:53:54,508 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:53:54,509 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 [2021-11-23 02:53:55,204 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:54:01,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27072#(and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= |ULTIMATE.start_cstrlen_~s~0#1.offset| 1) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (<= 0 |#NULL.offset|) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))' at error location [2021-11-23 02:54:01,354 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:54:01,355 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:54:01,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 27 [2021-11-23 02:54:01,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826894552] [2021-11-23 02:54:01,355 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:01,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:54:01,356 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:54:01,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:54:01,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1849, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:54:01,356 INFO L87 Difference]: Start difference. First operand 380 states and 445 transitions. Second operand has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:02,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:02,625 INFO L93 Difference]: Finished difference Result 384 states and 448 transitions. [2021-11-23 02:54:02,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 02:54:02,626 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 states have internal predecessors, (91), 0 states have call successors, (0), 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 43 [2021-11-23 02:54:02,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:02,628 INFO L225 Difference]: With dead ends: 384 [2021-11-23 02:54:02,628 INFO L226 Difference]: Without dead ends: 354 [2021-11-23 02:54:02,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1391 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=577, Invalid=5123, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 02:54:02,629 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 39 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:02,629 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 327 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 454 Invalid, 0 Unknown, 185 Unchecked, 0.2s Time] [2021-11-23 02:54:02,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-11-23 02:54:02,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 323. [2021-11-23 02:54:02,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 319 states have (on average 1.188087774294671) internal successors, (379), 322 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:02,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 379 transitions. [2021-11-23 02:54:02,636 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 379 transitions. Word has length 43 [2021-11-23 02:54:02,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:02,636 INFO L470 AbstractCegarLoop]: Abstraction has 323 states and 379 transitions. [2021-11-23 02:54:02,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.25) internal successors, (91), 28 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:02,637 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 379 transitions. [2021-11-23 02:54:02,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:54:02,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:02,650 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:02,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:02,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:02,865 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:54:02,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:02,866 INFO L85 PathProgramCache]: Analyzing trace with hash -414303349, now seen corresponding path program 1 times [2021-11-23 02:54:02,866 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:54:02,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908805735] [2021-11-23 02:54:02,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:02,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:54:02,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:03,310 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:03,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:54:03,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908805735] [2021-11-23 02:54:03,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908805735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:54:03,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957319223] [2021-11-23 02:54:03,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:03,311 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:03,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:03,313 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:03,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 02:54:03,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:03,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:54:03,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:03,437 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 [2021-11-23 02:54:03,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:54:03,708 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:03,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:54:04,369 INFO L354 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2021-11-23 02:54:04,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 23 [2021-11-23 02:54:04,376 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:04,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:04,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:54:04,783 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:04,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957319223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:04,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [579621902] [2021-11-23 02:54:04,784 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 02:54:04,784 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:54:04,785 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:54:04,785 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:54:04,785 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:54:04,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:04,809 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 [2021-11-23 02:54:04,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:04,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:04,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:04,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:04,952 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 91 treesize of output 83 [2021-11-23 02:54:05,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:05,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:54:05,071 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:05,071 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 [2021-11-23 02:54:06,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:54:15,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28147#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:54:15,020 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:54:15,020 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:54:15,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 32 [2021-11-23 02:54:15,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022243099] [2021-11-23 02:54:15,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:15,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 02:54:15,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:54:15,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 02:54:15,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=3038, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 02:54:15,022 INFO L87 Difference]: Start difference. First operand 323 states and 379 transitions. Second operand has 33 states, 33 states have (on average 3.212121212121212) internal successors, (106), 32 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) [2021-11-23 02:54:15,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:15,262 INFO L93 Difference]: Finished difference Result 340 states and 395 transitions. [2021-11-23 02:54:15,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:54:15,262 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.212121212121212) internal successors, (106), 32 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 43 [2021-11-23 02:54:15,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:15,263 INFO L225 Difference]: With dead ends: 340 [2021-11-23 02:54:15,264 INFO L226 Difference]: Without dead ends: 286 [2021-11-23 02:54:15,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1240 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=310, Invalid=3472, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 02:54:15,265 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 24 mSDsluCounter, 349 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:15,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 326 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 192 Invalid, 0 Unknown, 31 Unchecked, 0.1s Time] [2021-11-23 02:54:15,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-23 02:54:15,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 286. [2021-11-23 02:54:15,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 282 states have (on average 1.1914893617021276) internal successors, (336), 285 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:15,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 336 transitions. [2021-11-23 02:54:15,271 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 336 transitions. Word has length 43 [2021-11-23 02:54:15,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:15,272 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 336 transitions. [2021-11-23 02:54:15,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.212121212121212) internal successors, (106), 32 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) [2021-11-23 02:54:15,272 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 336 transitions. [2021-11-23 02:54:15,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:54:15,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:15,274 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:15,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:15,491 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:15,491 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:54:15,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:15,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1376230790, now seen corresponding path program 5 times [2021-11-23 02:54:15,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:54:15,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789678874] [2021-11-23 02:54:15,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:15,492 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:54:15,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:16,467 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 46 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:54:16,468 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:54:16,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789678874] [2021-11-23 02:54:16,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789678874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:54:16,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894735013] [2021-11-23 02:54:16,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:54:16,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:16,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:16,469 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:16,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 02:54:16,562 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:54:16,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:16,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 02:54:16,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:16,571 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 [2021-11-23 02:54:16,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:54:16,925 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:16,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:54:17,767 INFO L354 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2021-11-23 02:54:17,767 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 38 treesize of output 23 [2021-11-23 02:54:17,774 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:17,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:18,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:54:19,178 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:19,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894735013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:19,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910308553] [2021-11-23 02:54:19,180 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:54:19,180 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:54:19,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:54:19,180 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:54:19,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:54:19,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:19,209 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 [2021-11-23 02:54:19,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:54:19,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:19,304 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 23 treesize of output 19 [2021-11-23 02:54:19,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:19,342 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 91 treesize of output 83 [2021-11-23 02:54:19,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:19,408 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 [2021-11-23 02:54:19,451 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:19,451 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 [2021-11-23 02:54:20,209 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:54:26,765 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29114#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)))' at error location [2021-11-23 02:54:26,765 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:54:26,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:54:26,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 15, 15] total 43 [2021-11-23 02:54:26,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569016990] [2021-11-23 02:54:26,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:26,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 02:54:26,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:54:26,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 02:54:26,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=3342, Unknown=1, NotChecked=0, Total=3540 [2021-11-23 02:54:26,766 INFO L87 Difference]: Start difference. First operand 286 states and 336 transitions. Second operand has 44 states, 44 states have (on average 2.3636363636363638) internal successors, (104), 43 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) [2021-11-23 02:54:28,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:28,620 INFO L93 Difference]: Finished difference Result 461 states and 539 transitions. [2021-11-23 02:54:28,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 02:54:28,620 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.3636363636363638) internal successors, (104), 43 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) Word has length 45 [2021-11-23 02:54:28,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:28,622 INFO L225 Difference]: With dead ends: 461 [2021-11-23 02:54:28,622 INFO L226 Difference]: Without dead ends: 455 [2021-11-23 02:54:28,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=353, Invalid=5498, Unknown=1, NotChecked=0, Total=5852 [2021-11-23 02:54:28,623 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 199 mSDsluCounter, 1314 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 1143 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:28,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 1143 Invalid, 1036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 820 Invalid, 0 Unknown, 185 Unchecked, 0.5s Time] [2021-11-23 02:54:28,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-23 02:54:28,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 347. [2021-11-23 02:54:28,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 343 states have (on average 1.186588921282799) internal successors, (407), 346 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:28,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 407 transitions. [2021-11-23 02:54:28,631 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 407 transitions. Word has length 45 [2021-11-23 02:54:28,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:28,631 INFO L470 AbstractCegarLoop]: Abstraction has 347 states and 407 transitions. [2021-11-23 02:54:28,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.3636363636363638) internal successors, (104), 43 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) [2021-11-23 02:54:28,632 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 407 transitions. [2021-11-23 02:54:28,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:54:28,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:28,633 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:28,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2021-11-23 02:54:28,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-23 02:54:28,849 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:54:28,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:28,849 INFO L85 PathProgramCache]: Analyzing trace with hash -424954857, now seen corresponding path program 1 times [2021-11-23 02:54:28,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:54:28,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811561244] [2021-11-23 02:54:28,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:28,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:54:28,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:29,081 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:54:29,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:54:29,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811561244] [2021-11-23 02:54:29,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811561244] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:54:29,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197703034] [2021-11-23 02:54:29,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:29,082 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:29,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:29,085 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:29,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-23 02:54:29,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:29,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 02:54:29,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:29,467 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:54:29,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:29,786 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 [2021-11-23 02:54:29,823 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:54:29,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197703034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:29,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1968621027] [2021-11-23 02:54:29,825 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-23 02:54:29,825 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:54:29,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:54:29,826 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:54:29,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:54:29,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:29,859 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 [2021-11-23 02:54:29,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:29,929 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 23 treesize of output 19 [2021-11-23 02:54:29,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:29,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:29,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2021-11-23 02:54:30,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:30,050 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 [2021-11-23 02:54:30,081 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:30,082 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 [2021-11-23 02:54:31,333 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:54:39,023 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30270#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#t~pre8#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#t~pre8#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~pre8#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~pre8#1.offset| 1)) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_cstrncmp_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_#t~pre8#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-23 02:54:39,023 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:54:39,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:54:39,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 27 [2021-11-23 02:54:39,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175292249] [2021-11-23 02:54:39,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:39,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:54:39,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:54:39,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:54:39,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=2487, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:54:39,024 INFO L87 Difference]: Start difference. First operand 347 states and 407 transitions. Second operand has 28 states, 27 states have (on average 3.185185185185185) internal successors, (86), 28 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) [2021-11-23 02:54:40,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:40,293 INFO L93 Difference]: Finished difference Result 718 states and 836 transitions. [2021-11-23 02:54:40,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:54:40,293 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 3.185185185185185) internal successors, (86), 28 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) Word has length 46 [2021-11-23 02:54:40,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:40,296 INFO L225 Difference]: With dead ends: 718 [2021-11-23 02:54:40,296 INFO L226 Difference]: Without dead ends: 718 [2021-11-23 02:54:40,297 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1338 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=789, Invalid=4761, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 02:54:40,297 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 788 mSDsluCounter, 443 mSDsCounter, 0 mSdLazyCounter, 678 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 788 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:40,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [788 Valid, 422 Invalid, 792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 678 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:54:40,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2021-11-23 02:54:40,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 522. [2021-11-23 02:54:40,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 518 states have (on average 1.22007722007722) internal successors, (632), 521 states have internal predecessors, (632), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:40,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 632 transitions. [2021-11-23 02:54:40,305 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 632 transitions. Word has length 46 [2021-11-23 02:54:40,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:40,305 INFO L470 AbstractCegarLoop]: Abstraction has 522 states and 632 transitions. [2021-11-23 02:54:40,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 3.185185185185185) internal successors, (86), 28 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) [2021-11-23 02:54:40,306 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 632 transitions. [2021-11-23 02:54:40,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:54:40,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:40,307 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:40,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:40,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-23 02:54:40,521 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:54:40,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:40,521 INFO L85 PathProgramCache]: Analyzing trace with hash -1280727606, now seen corresponding path program 6 times [2021-11-23 02:54:40,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:54:40,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084662226] [2021-11-23 02:54:40,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:40,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:54:40,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:40,728 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:40,728 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:54:40,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084662226] [2021-11-23 02:54:40,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084662226] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:54:40,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862285743] [2021-11-23 02:54:40,728 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:54:40,729 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:40,729 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:40,733 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:40,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 02:54:40,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:54:40,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:40,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-23 02:54:40,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:41,111 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:41,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:41,540 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 [2021-11-23 02:54:41,570 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 20 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:41,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862285743] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:41,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [697160790] [2021-11-23 02:54:41,572 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-23 02:54:41,572 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:54:41,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:54:41,573 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:54:41,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:54:41,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:41,606 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 [2021-11-23 02:54:41,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:54:41,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:41,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:54:41,816 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:54:41,817 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 87 treesize of output 86 [2021-11-23 02:54:41,870 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 23 treesize of output 19 [2021-11-23 02:54:41,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:54:41,926 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:41,926 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 [2021-11-23 02:54:42,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:54:48,163 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31880#(and (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 1 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_cstrstr_#t~post17#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)))' at error location [2021-11-23 02:54:48,163 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:54:48,163 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:54:48,163 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 23 [2021-11-23 02:54:48,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867841943] [2021-11-23 02:54:48,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:48,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:54:48,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:54:48,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:54:48,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1459, Unknown=0, NotChecked=0, Total=1640 [2021-11-23 02:54:48,165 INFO L87 Difference]: Start difference. First operand 522 states and 632 transitions. Second operand has 25 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 24 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:49,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:54:49,108 INFO L93 Difference]: Finished difference Result 1090 states and 1329 transitions. [2021-11-23 02:54:49,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:54:49,108 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 24 states have internal predecessors, (79), 0 states have call successors, (0), 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 47 [2021-11-23 02:54:49,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:54:49,113 INFO L225 Difference]: With dead ends: 1090 [2021-11-23 02:54:49,113 INFO L226 Difference]: Without dead ends: 1090 [2021-11-23 02:54:49,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=392, Invalid=2688, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 02:54:49,114 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 578 mSDsluCounter, 850 mSDsCounter, 0 mSdLazyCounter, 1194 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 765 SdHoareTripleChecker+Invalid, 1211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:54:49,114 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [578 Valid, 765 Invalid, 1211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1194 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:54:49,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1090 states. [2021-11-23 02:54:49,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1090 to 748. [2021-11-23 02:54:49,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 748 states, 744 states have (on average 1.228494623655914) internal successors, (914), 747 states have internal predecessors, (914), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:49,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 748 states to 748 states and 914 transitions. [2021-11-23 02:54:49,130 INFO L78 Accepts]: Start accepts. Automaton has 748 states and 914 transitions. Word has length 47 [2021-11-23 02:54:49,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:54:49,130 INFO L470 AbstractCegarLoop]: Abstraction has 748 states and 914 transitions. [2021-11-23 02:54:49,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.2916666666666665) internal successors, (79), 24 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:54:49,130 INFO L276 IsEmpty]: Start isEmpty. Operand 748 states and 914 transitions. [2021-11-23 02:54:49,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:54:49,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:54:49,132 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:54:49,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 02:54:49,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:49,354 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:54:49,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:54:49,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1047890674, now seen corresponding path program 2 times [2021-11-23 02:54:49,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:54:49,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409175857] [2021-11-23 02:54:49,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:54:49,355 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:54:49,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:54:49,574 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:54:49,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:54:49,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409175857] [2021-11-23 02:54:49,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409175857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:54:49,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594185451] [2021-11-23 02:54:49,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:54:49,575 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:54:49,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:54:49,576 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:54:49,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 02:54:49,675 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:54:49,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:54:49,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-23 02:54:49,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:54:49,697 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:54:49,697 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 [2021-11-23 02:54:49,705 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 [2021-11-23 02:54:49,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-23 02:54:49,988 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-23 02:54:49,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 02:54:50,486 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-23 02:54:50,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 24 [2021-11-23 02:54:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:54:50,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:54:51,218 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 71 treesize of output 65 [2021-11-23 02:54:51,490 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 02:54:51,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594185451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:54:51,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110889006] [2021-11-23 02:54:51,491 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-23 02:54:51,492 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:54:51,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:54:51,492 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:54:51,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:54:51,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:51,530 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 [2021-11-23 02:54:51,562 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 20 treesize of output 16 [2021-11-23 02:54:51,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:54:51,648 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 23 treesize of output 19 [2021-11-23 02:54:51,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:54:51,711 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 91 treesize of output 83 [2021-11-23 02:54:51,757 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 23 treesize of output 19 [2021-11-23 02:54:51,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:54:51,825 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:54:51,826 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 [2021-11-23 02:54:52,774 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:54:58,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34080#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:54:58,548 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:54:58,548 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:54:58,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 10] total 32 [2021-11-23 02:54:58,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524901432] [2021-11-23 02:54:58,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:54:58,548 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 02:54:58,548 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:54:58,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 02:54:58,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=2523, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:54:58,549 INFO L87 Difference]: Start difference. First operand 748 states and 914 transitions. Second operand has 34 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) [2021-11-23 02:55:00,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:00,046 INFO L93 Difference]: Finished difference Result 1099 states and 1328 transitions. [2021-11-23 02:55:00,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 02:55:00,047 INFO L78 Accepts]: Start accepts. Automaton has has 34 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 48 [2021-11-23 02:55:00,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:00,050 INFO L225 Difference]: With dead ends: 1099 [2021-11-23 02:55:00,050 INFO L226 Difference]: Without dead ends: 1099 [2021-11-23 02:55:00,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1805 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=635, Invalid=6675, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 02:55:00,051 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 158 mSDsluCounter, 474 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 463 SdHoareTripleChecker+Invalid, 1071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 275 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:00,051 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 463 Invalid, 1071 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 765 Invalid, 0 Unknown, 275 Unchecked, 0.4s Time] [2021-11-23 02:55:00,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1099 states. [2021-11-23 02:55:00,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1099 to 759. [2021-11-23 02:55:00,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 759 states, 755 states have (on average 1.2251655629139073) internal successors, (925), 758 states have internal predecessors, (925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:00,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 759 states to 759 states and 925 transitions. [2021-11-23 02:55:00,061 INFO L78 Accepts]: Start accepts. Automaton has 759 states and 925 transitions. Word has length 48 [2021-11-23 02:55:00,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:00,061 INFO L470 AbstractCegarLoop]: Abstraction has 759 states and 925 transitions. [2021-11-23 02:55:00,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 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) [2021-11-23 02:55:00,062 INFO L276 IsEmpty]: Start isEmpty. Operand 759 states and 925 transitions. [2021-11-23 02:55:00,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:55:00,063 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:00,063 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:00,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:00,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-23 02:55:00,281 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:55:00,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:00,281 INFO L85 PathProgramCache]: Analyzing trace with hash -351811556, now seen corresponding path program 3 times [2021-11-23 02:55:00,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:00,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761188223] [2021-11-23 02:55:00,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:00,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:00,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:00,511 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:55:00,511 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:00,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761188223] [2021-11-23 02:55:00,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [761188223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:55:00,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149715717] [2021-11-23 02:55:00,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:55:00,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:00,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:00,513 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:00,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-23 02:55:00,629 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:55:00,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:55:00,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-23 02:55:00,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:01,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:55:01,160 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-23 02:55:01,160 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 30 treesize of output 29 [2021-11-23 02:55:02,534 INFO L354 Elim1Store]: treesize reduction 61, result has 16.4 percent of original size [2021-11-23 02:55:02,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 47 treesize of output 34 [2021-11-23 02:55:02,591 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 5 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:55:02,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:05,601 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-23 02:55:05,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 217 treesize of output 177 [2021-11-23 02:55:05,610 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:55:05,610 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 173 treesize of output 167 [2021-11-23 02:55:05,665 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 66 treesize of output 58 [2021-11-23 02:55:05,683 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-23 02:55:05,684 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 17 treesize of output 11 [2021-11-23 02:55:05,884 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 16 treesize of output 12 [2021-11-23 02:55:06,146 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 02:55:06,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149715717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:06,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1695961524] [2021-11-23 02:55:06,148 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:55:06,148 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:55:06,148 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:55:06,148 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:55:06,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:06,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:55:06,195 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 [2021-11-23 02:55:06,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:55:06,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:55:06,293 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 20 treesize of output 16 [2021-11-23 02:55:06,345 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:55:06,345 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 87 treesize of output 86 [2021-11-23 02:55:06,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:55:06,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:55:06,521 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:55:06,522 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 [2021-11-23 02:55:07,677 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:55:16,374 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36359#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:55:16,374 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:55:16,375 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:55:16,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 22, 20] total 50 [2021-11-23 02:55:16,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710219871] [2021-11-23 02:55:16,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:55:16,375 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 02:55:16,375 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:16,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 02:55:16,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=4786, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:55:16,376 INFO L87 Difference]: Start difference. First operand 759 states and 925 transitions. Second operand has 50 states, 50 states have (on average 2.5) internal successors, (125), 50 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:29,195 WARN L227 SmtUtils]: Spent 12.04s on a formula simplification that was a NOOP. DAG size: 43 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:55:31,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:31,527 INFO L93 Difference]: Finished difference Result 1030 states and 1223 transitions. [2021-11-23 02:55:31,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 02:55:31,529 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.5) internal successors, (125), 50 states have internal predecessors, (125), 0 states have call successors, (0), 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 [2021-11-23 02:55:31,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:31,533 INFO L225 Difference]: With dead ends: 1030 [2021-11-23 02:55:31,533 INFO L226 Difference]: Without dead ends: 1009 [2021-11-23 02:55:31,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 83 SyntacticMatches, 4 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3505 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=724, Invalid=13082, Unknown=0, NotChecked=0, Total=13806 [2021-11-23 02:55:31,534 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 154 mSDsluCounter, 893 mSDsCounter, 0 mSdLazyCounter, 972 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 972 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 328 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:31,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 851 Invalid, 1320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 972 Invalid, 0 Unknown, 328 Unchecked, 0.6s Time] [2021-11-23 02:55:31,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1009 states. [2021-11-23 02:55:31,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1009 to 895. [2021-11-23 02:55:31,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 895 states, 891 states have (on average 1.2166105499438833) internal successors, (1084), 894 states have internal predecessors, (1084), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:31,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 895 states to 895 states and 1084 transitions. [2021-11-23 02:55:31,546 INFO L78 Accepts]: Start accepts. Automaton has 895 states and 1084 transitions. Word has length 48 [2021-11-23 02:55:31,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:31,546 INFO L470 AbstractCegarLoop]: Abstraction has 895 states and 1084 transitions. [2021-11-23 02:55:31,547 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.5) internal successors, (125), 50 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:31,547 INFO L276 IsEmpty]: Start isEmpty. Operand 895 states and 1084 transitions. [2021-11-23 02:55:31,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 02:55:31,548 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:31,549 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:31,583 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:31,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-23 02:55:31,765 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:55:31,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:31,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1577702487, now seen corresponding path program 2 times [2021-11-23 02:55:31,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:31,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361251542] [2021-11-23 02:55:31,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:31,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:31,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:32,144 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:55:32,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:32,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361251542] [2021-11-23 02:55:32,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361251542] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:55:32,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288187453] [2021-11-23 02:55:32,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:55:32,145 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:32,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:32,146 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:32,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 02:55:32,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:55:32,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:55:32,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 02:55:32,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:32,254 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 [2021-11-23 02:55:32,258 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 [2021-11-23 02:55:32,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:55:32,630 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-23 02:55:32,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2021-11-23 02:55:33,444 INFO L354 Elim1Store]: treesize reduction 45, result has 21.1 percent of original size [2021-11-23 02:55:33,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 49 treesize of output 37 [2021-11-23 02:55:33,558 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:55:33,558 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:34,810 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 71 treesize of output 67 [2021-11-23 02:55:35,264 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:55:35,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288187453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:35,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1578757214] [2021-11-23 02:55:35,265 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 02:55:35,265 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:55:35,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:55:35,266 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:55:35,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:35,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:55:35,296 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 [2021-11-23 02:55:35,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:55:35,389 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 23 treesize of output 19 [2021-11-23 02:55:35,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:55:35,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:55:35,497 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 91 treesize of output 83 [2021-11-23 02:55:35,528 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 23 treesize of output 19 [2021-11-23 02:55:35,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:55:35,583 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:55:35,583 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 [2021-11-23 02:55:36,658 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:55:45,902 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38729#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:55:45,902 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:55:45,903 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:55:45,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 11] total 36 [2021-11-23 02:55:45,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011875344] [2021-11-23 02:55:45,903 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:55:45,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:55:45,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:55:45,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:55:45,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=3489, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 02:55:45,905 INFO L87 Difference]: Start difference. First operand 895 states and 1084 transitions. Second operand has 37 states, 37 states have (on average 3.4054054054054053) internal successors, (126), 36 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:48,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:55:48,055 INFO L93 Difference]: Finished difference Result 1188 states and 1408 transitions. [2021-11-23 02:55:48,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 02:55:48,055 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.4054054054054053) internal successors, (126), 36 states have internal predecessors, (126), 0 states have call successors, (0), 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 49 [2021-11-23 02:55:48,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:55:48,061 INFO L225 Difference]: With dead ends: 1188 [2021-11-23 02:55:48,062 INFO L226 Difference]: Without dead ends: 1182 [2021-11-23 02:55:48,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2384 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=724, Invalid=8396, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 02:55:48,063 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 115 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:55:48,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 423 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 257 Invalid, 0 Unknown, 76 Unchecked, 0.2s Time] [2021-11-23 02:55:48,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1182 states. [2021-11-23 02:55:48,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1182 to 1093. [2021-11-23 02:55:48,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1093 states, 1089 states have (on average 1.1983471074380165) internal successors, (1305), 1092 states have internal predecessors, (1305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:48,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1093 states to 1093 states and 1305 transitions. [2021-11-23 02:55:48,078 INFO L78 Accepts]: Start accepts. Automaton has 1093 states and 1305 transitions. Word has length 49 [2021-11-23 02:55:48,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:55:48,078 INFO L470 AbstractCegarLoop]: Abstraction has 1093 states and 1305 transitions. [2021-11-23 02:55:48,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.4054054054054053) internal successors, (126), 36 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:55:48,079 INFO L276 IsEmpty]: Start isEmpty. Operand 1093 states and 1305 transitions. [2021-11-23 02:55:48,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:55:48,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:55:48,081 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:55:48,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-23 02:55:48,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:48,302 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:55:48,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:55:48,302 INFO L85 PathProgramCache]: Analyzing trace with hash 779090849, now seen corresponding path program 1 times [2021-11-23 02:55:48,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:55:48,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284409061] [2021-11-23 02:55:48,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:48,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:55:48,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:55:48,637 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:55:48,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284409061] [2021-11-23 02:55:48,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284409061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:55:48,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566441046] [2021-11-23 02:55:48,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:55:48,638 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:55:48,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:55:48,639 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:55:48,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 02:55:48,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:55:48,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-23 02:55:48,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:55:48,763 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 [2021-11-23 02:55:49,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:55:49,101 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:55:49,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:55:50,269 INFO L354 Elim1Store]: treesize reduction 58, result has 31.0 percent of original size [2021-11-23 02:55:50,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 48 [2021-11-23 02:55:50,313 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:55:50,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:55:55,247 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-23 02:55:55,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 412 treesize of output 368 [2021-11-23 02:55:55,644 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:55:55,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566441046] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:55:55,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [222574137] [2021-11-23 02:55:55,646 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 02:55:55,647 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:55:55,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:55:55,647 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:55:55,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:55:55,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:55:55,673 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 [2021-11-23 02:55:55,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:55:55,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:55:55,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:55:55,832 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:55:55,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 87 treesize of output 86 [2021-11-23 02:55:55,888 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 23 treesize of output 19 [2021-11-23 02:55:55,912 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 [2021-11-23 02:55:55,946 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:55:55,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 02:55:56,881 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:56:06,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41448#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:56:06,417 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:56:06,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:56:06,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 43 [2021-11-23 02:56:06,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253905381] [2021-11-23 02:56:06,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:56:06,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 02:56:06,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:06,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 02:56:06,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=4386, Unknown=2, NotChecked=0, Total=4692 [2021-11-23 02:56:06,419 INFO L87 Difference]: Start difference. First operand 1093 states and 1305 transitions. Second operand has 44 states, 44 states have (on average 2.6136363636363638) internal successors, (115), 43 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:06,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:06,864 INFO L93 Difference]: Finished difference Result 1127 states and 1337 transitions. [2021-11-23 02:56:06,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 02:56:06,865 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.6136363636363638) internal successors, (115), 43 states have internal predecessors, (115), 0 states have call successors, (0), 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 [2021-11-23 02:56:06,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:06,870 INFO L225 Difference]: With dead ends: 1127 [2021-11-23 02:56:06,870 INFO L226 Difference]: Without dead ends: 1093 [2021-11-23 02:56:06,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1715 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=356, Invalid=5192, Unknown=2, NotChecked=0, Total=5550 [2021-11-23 02:56:06,871 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 41 mSDsluCounter, 655 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:06,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 580 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 375 Invalid, 0 Unknown, 92 Unchecked, 0.2s Time] [2021-11-23 02:56:06,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1093 states. [2021-11-23 02:56:06,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1093 to 1093. [2021-11-23 02:56:06,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1093 states, 1089 states have (on average 1.194674012855831) internal successors, (1301), 1092 states have internal predecessors, (1301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:06,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1093 states to 1093 states and 1301 transitions. [2021-11-23 02:56:06,891 INFO L78 Accepts]: Start accepts. Automaton has 1093 states and 1301 transitions. Word has length 50 [2021-11-23 02:56:06,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:06,891 INFO L470 AbstractCegarLoop]: Abstraction has 1093 states and 1301 transitions. [2021-11-23 02:56:06,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.6136363636363638) internal successors, (115), 43 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:06,892 INFO L276 IsEmpty]: Start isEmpty. Operand 1093 states and 1301 transitions. [2021-11-23 02:56:06,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 02:56:06,894 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:06,894 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:06,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-23 02:56:07,116 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-23 02:56:07,116 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:56:07,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:07,116 INFO L85 PathProgramCache]: Analyzing trace with hash -1314665167, now seen corresponding path program 1 times [2021-11-23 02:56:07,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:07,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841874975] [2021-11-23 02:56:07,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:07,117 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:07,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:07,674 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 28 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:56:07,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:07,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841874975] [2021-11-23 02:56:07,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841874975] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:07,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350200612] [2021-11-23 02:56:07,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:07,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:07,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:07,677 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:07,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-23 02:56:07,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:07,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-23 02:56:07,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:07,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-23 02:56:08,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:56:08,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-23 02:56:09,479 INFO L354 Elim1Store]: treesize reduction 75, result has 9.6 percent of original size [2021-11-23 02:56:09,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 34 [2021-11-23 02:56:09,519 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:56:09,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:10,844 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse1 (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse1 (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= .cse0 0) (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| .cse1) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) .cse0)))))) is different from false [2021-11-23 02:56:10,860 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-23 02:56:10,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 217 treesize of output 177 [2021-11-23 02:56:10,875 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:56:10,875 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 173 treesize of output 167 [2021-11-23 02:56:10,990 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-23 02:56:10,991 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 28 treesize of output 22 [2021-11-23 02:56:11,091 INFO L354 Elim1Store]: treesize reduction 13, result has 66.7 percent of original size [2021-11-23 02:56:11,091 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 84 treesize of output 88 [2021-11-23 02:56:11,531 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 5 proven. 28 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:56:11,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350200612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:11,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150921916] [2021-11-23 02:56:11,533 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:56:11,533 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:56:11,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:56:11,534 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:56:11,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:56:11,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:56:11,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:56:11,596 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 23 treesize of output 19 [2021-11-23 02:56:11,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:56:11,646 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 23 treesize of output 19 [2021-11-23 02:56:11,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:56:11,689 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 91 treesize of output 83 [2021-11-23 02:56:11,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:56:11,750 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 [2021-11-23 02:56:11,788 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:56:11,789 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 [2021-11-23 02:56:13,305 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:56:22,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44066#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:56:22,382 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:56:22,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:56:22,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20, 19] total 54 [2021-11-23 02:56:22,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763136588] [2021-11-23 02:56:22,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:56:22,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 02:56:22,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:22,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 02:56:22,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=5712, Unknown=1, NotChecked=152, Total=6162 [2021-11-23 02:56:22,384 INFO L87 Difference]: Start difference. First operand 1093 states and 1301 transitions. Second operand has 55 states, 55 states have (on average 2.3454545454545452) internal successors, (129), 54 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) [2021-11-23 02:56:26,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:26,770 INFO L93 Difference]: Finished difference Result 1336 states and 1598 transitions. [2021-11-23 02:56:26,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 02:56:26,770 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.3454545454545452) internal successors, (129), 54 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 52 [2021-11-23 02:56:26,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:26,775 INFO L225 Difference]: With dead ends: 1336 [2021-11-23 02:56:26,775 INFO L226 Difference]: Without dead ends: 1336 [2021-11-23 02:56:26,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2404 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=454, Invalid=8669, Unknown=1, NotChecked=188, Total=9312 [2021-11-23 02:56:26,776 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 175 mSDsluCounter, 1338 mSDsCounter, 0 mSdLazyCounter, 976 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 1136 SdHoareTripleChecker+Invalid, 1427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 976 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 425 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:26,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 1136 Invalid, 1427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 976 Invalid, 0 Unknown, 425 Unchecked, 0.5s Time] [2021-11-23 02:56:26,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1336 states. [2021-11-23 02:56:26,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1336 to 1089. [2021-11-23 02:56:26,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1089 states, 1085 states have (on average 1.1953917050691245) internal successors, (1297), 1088 states have internal predecessors, (1297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:26,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1089 states to 1089 states and 1297 transitions. [2021-11-23 02:56:26,789 INFO L78 Accepts]: Start accepts. Automaton has 1089 states and 1297 transitions. Word has length 52 [2021-11-23 02:56:26,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:26,789 INFO L470 AbstractCegarLoop]: Abstraction has 1089 states and 1297 transitions. [2021-11-23 02:56:26,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.3454545454545452) internal successors, (129), 54 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) [2021-11-23 02:56:26,790 INFO L276 IsEmpty]: Start isEmpty. Operand 1089 states and 1297 transitions. [2021-11-23 02:56:26,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 02:56:26,791 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:26,791 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:26,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:27,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-23 02:56:27,001 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:56:27,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:27,001 INFO L85 PathProgramCache]: Analyzing trace with hash -427628864, now seen corresponding path program 1 times [2021-11-23 02:56:27,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:27,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903450972] [2021-11-23 02:56:27,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:27,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:27,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:27,176 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:56:27,176 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:27,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903450972] [2021-11-23 02:56:27,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903450972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:56:27,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368056907] [2021-11-23 02:56:27,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:27,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:27,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:27,178 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:27,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 02:56:27,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:27,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-23 02:56:27,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:27,272 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 [2021-11-23 02:56:27,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:56:27,577 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 36 treesize of output 35 [2021-11-23 02:56:29,290 INFO L354 Elim1Store]: treesize reduction 72, result has 10.0 percent of original size [2021-11-23 02:56:29,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 63 treesize of output 45 [2021-11-23 02:56:29,333 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:56:29,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:54,065 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-23 02:56:54,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 215 treesize of output 175 [2021-11-23 02:56:54,073 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:56:54,074 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 171 treesize of output 165 [2021-11-23 02:56:54,099 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:56:54,099 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 28 treesize of output 19 [2021-11-23 02:56:54,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:56:54,162 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:56:54,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 80 treesize of output 84 [2021-11-23 02:56:55,123 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 02:56:55,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368056907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:55,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1050502268] [2021-11-23 02:56:55,124 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 02:56:55,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:56:55,125 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:56:55,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:56:55,125 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:56:55,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:56:55,157 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 [2021-11-23 02:56:55,183 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 23 treesize of output 19 [2021-11-23 02:56:55,234 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 23 treesize of output 19 [2021-11-23 02:56:55,267 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 20 treesize of output 16 [2021-11-23 02:56:55,327 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:56:55,327 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 87 treesize of output 86 [2021-11-23 02:56:55,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:56:55,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:56:55,453 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:56:55,453 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 [2021-11-23 02:57:00,393 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:57:11,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46900#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:57:11,975 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:57:11,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:57:11,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 18, 18] total 42 [2021-11-23 02:57:11,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42763700] [2021-11-23 02:57:11,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:57:11,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-23 02:57:11,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:57:11,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-23 02:57:11,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=4549, Unknown=12, NotChecked=0, Total=4830 [2021-11-23 02:57:11,977 INFO L87 Difference]: Start difference. First operand 1089 states and 1297 transitions. Second operand has 42 states, 42 states have (on average 3.0952380952380953) internal successors, (130), 42 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) [2021-11-23 02:57:13,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:57:13,098 INFO L93 Difference]: Finished difference Result 1138 states and 1310 transitions. [2021-11-23 02:57:13,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-23 02:57:13,098 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.0952380952380953) internal successors, (130), 42 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) Word has length 52 [2021-11-23 02:57:13,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:57:13,103 INFO L225 Difference]: With dead ends: 1138 [2021-11-23 02:57:13,103 INFO L226 Difference]: Without dead ends: 1090 [2021-11-23 02:57:13,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 99 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1939 ImplicationChecksByTransitivity, 38.0s TimeCoverageRelationStatistics Valid=378, Invalid=6920, Unknown=12, NotChecked=0, Total=7310 [2021-11-23 02:57:13,104 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 69 mSDsluCounter, 683 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 646 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 153 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:57:13,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 646 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 296 Invalid, 0 Unknown, 153 Unchecked, 0.2s Time] [2021-11-23 02:57:13,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1090 states. [2021-11-23 02:57:13,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1090 to 857. [2021-11-23 02:57:13,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 857 states, 853 states have (on average 1.1934349355216882) internal successors, (1018), 856 states have internal predecessors, (1018), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:13,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 857 states to 857 states and 1018 transitions. [2021-11-23 02:57:13,114 INFO L78 Accepts]: Start accepts. Automaton has 857 states and 1018 transitions. Word has length 52 [2021-11-23 02:57:13,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:57:13,114 INFO L470 AbstractCegarLoop]: Abstraction has 857 states and 1018 transitions. [2021-11-23 02:57:13,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.0952380952380953) internal successors, (130), 42 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) [2021-11-23 02:57:13,115 INFO L276 IsEmpty]: Start isEmpty. Operand 857 states and 1018 transitions. [2021-11-23 02:57:13,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:57:13,116 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:57:13,116 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:57:13,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 02:57:13,316 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:13,316 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:57:13,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:57:13,317 INFO L85 PathProgramCache]: Analyzing trace with hash -1501815167, now seen corresponding path program 1 times [2021-11-23 02:57:13,317 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:57:13,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670819163] [2021-11-23 02:57:13,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:13,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:57:13,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:13,577 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:57:13,577 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:57:13,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670819163] [2021-11-23 02:57:13,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670819163] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:57:13,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525069508] [2021-11-23 02:57:13,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:13,578 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:13,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:57:13,579 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:57:13,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-23 02:57:13,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:13,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-23 02:57:13,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:13,994 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:57:13,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:14,339 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 [2021-11-23 02:57:14,391 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:57:14,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525069508] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:14,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419397596] [2021-11-23 02:57:14,393 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:57:14,393 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:57:14,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:57:14,393 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:57:14,393 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:57:14,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:57:14,427 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 [2021-11-23 02:57:14,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:57:14,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:57:14,519 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 20 treesize of output 16 [2021-11-23 02:57:14,572 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:57:14,572 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 87 treesize of output 86 [2021-11-23 02:57:14,620 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 23 treesize of output 19 [2021-11-23 02:57:14,643 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 [2021-11-23 02:57:14,683 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:57:14,683 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 [2021-11-23 02:57:15,932 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:57:23,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49305#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (+ |ULTIMATE.start_cstrncmp_#t~post5#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_cstrncmp_#t~post5#1.offset|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:57:23,165 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:57:23,165 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:57:23,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 29 [2021-11-23 02:57:23,165 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431065479] [2021-11-23 02:57:23,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:57:23,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 02:57:23,166 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:57:23,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 02:57:23,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2492, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:57:23,166 INFO L87 Difference]: Start difference. First operand 857 states and 1018 transitions. Second operand has 30 states, 29 states have (on average 3.310344827586207) internal successors, (96), 30 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) [2021-11-23 02:57:24,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:57:24,738 INFO L93 Difference]: Finished difference Result 1964 states and 2257 transitions. [2021-11-23 02:57:24,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 02:57:24,738 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 3.310344827586207) internal successors, (96), 30 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) Word has length 53 [2021-11-23 02:57:24,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:57:24,745 INFO L225 Difference]: With dead ends: 1964 [2021-11-23 02:57:24,746 INFO L226 Difference]: Without dead ends: 1964 [2021-11-23 02:57:24,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1495 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=965, Invalid=5355, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 02:57:24,746 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 675 mSDsluCounter, 721 mSDsCounter, 0 mSdLazyCounter, 1002 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 675 SdHoareTripleChecker+Valid, 675 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:57:24,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [675 Valid, 675 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1002 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:57:24,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1964 states. [2021-11-23 02:57:24,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1964 to 1327. [2021-11-23 02:57:24,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1327 states, 1323 states have (on average 1.1904761904761905) internal successors, (1575), 1326 states have internal predecessors, (1575), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:24,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1327 states to 1327 states and 1575 transitions. [2021-11-23 02:57:24,765 INFO L78 Accepts]: Start accepts. Automaton has 1327 states and 1575 transitions. Word has length 53 [2021-11-23 02:57:24,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:57:24,765 INFO L470 AbstractCegarLoop]: Abstraction has 1327 states and 1575 transitions. [2021-11-23 02:57:24,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 3.310344827586207) internal successors, (96), 30 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) [2021-11-23 02:57:24,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1327 states and 1575 transitions. [2021-11-23 02:57:24,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:57:24,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:57:24,767 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:57:24,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-23 02:57:24,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:24,993 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:57:24,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:57:24,993 INFO L85 PathProgramCache]: Analyzing trace with hash 922267757, now seen corresponding path program 2 times [2021-11-23 02:57:24,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:57:24,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608052411] [2021-11-23 02:57:24,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:24,994 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:57:25,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:25,184 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:57:25,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:57:25,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608052411] [2021-11-23 02:57:25,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608052411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:57:25,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426325767] [2021-11-23 02:57:25,185 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:57:25,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:25,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:57:25,189 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:57:25,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-23 02:57:25,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:57:25,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:57:25,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-23 02:57:25,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:25,321 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:57:25,321 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 [2021-11-23 02:57:25,331 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 [2021-11-23 02:57:25,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-23 02:57:25,727 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 27 treesize of output 26 [2021-11-23 02:57:26,622 INFO L354 Elim1Store]: treesize reduction 70, result has 21.3 percent of original size [2021-11-23 02:57:26,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 49 treesize of output 39 [2021-11-23 02:57:26,839 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:57:26,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:28,039 INFO L354 Elim1Store]: treesize reduction 23, result has 46.5 percent of original size [2021-11-23 02:57:28,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 220 treesize of output 180 [2021-11-23 02:57:28,049 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:57:28,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 176 treesize of output 170 [2021-11-23 02:57:28,068 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 64 treesize of output 57 [2021-11-23 02:57:28,108 WARN L234 Elim1Store]: Array PQE input equivalent to true [2021-11-23 02:57:28,160 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:57:28,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 83 treesize of output 89 [2021-11-23 02:57:29,863 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-23 02:57:29,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426325767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:29,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1601702603] [2021-11-23 02:57:29,864 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:57:29,864 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:57:29,864 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:57:29,865 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:57:29,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:57:29,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:57:29,883 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 [2021-11-23 02:57:29,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:57:29,979 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 23 treesize of output 19 [2021-11-23 02:57:30,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:57:30,067 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:57:30,067 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 87 treesize of output 86 [2021-11-23 02:57:30,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:57:30,169 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 [2021-11-23 02:57:30,227 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:57:30,228 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 [2021-11-23 02:57:31,631 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:57:39,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53030#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:57:39,736 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:57:39,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:57:39,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 37 [2021-11-23 02:57:39,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315828684] [2021-11-23 02:57:39,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:57:39,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 02:57:39,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:57:39,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 02:57:39,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=3519, Unknown=0, NotChecked=0, Total=3782 [2021-11-23 02:57:39,738 INFO L87 Difference]: Start difference. First operand 1327 states and 1575 transitions. Second operand has 39 states, 38 states have (on average 3.026315789473684) internal successors, (115), 38 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:46,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:57:46,184 INFO L93 Difference]: Finished difference Result 1624 states and 1897 transitions. [2021-11-23 02:57:46,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-23 02:57:46,185 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.026315789473684) internal successors, (115), 38 states have internal predecessors, (115), 0 states have call successors, (0), 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 54 [2021-11-23 02:57:46,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:57:46,191 INFO L225 Difference]: With dead ends: 1624 [2021-11-23 02:57:46,191 INFO L226 Difference]: Without dead ends: 1624 [2021-11-23 02:57:46,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 118 SyntacticMatches, 7 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4922 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=2267, Invalid=16093, Unknown=0, NotChecked=0, Total=18360 [2021-11-23 02:57:46,193 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 380 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1783 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 1161 SdHoareTripleChecker+Invalid, 2401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 1783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 514 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:57:46,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [380 Valid, 1161 Invalid, 2401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 1783 Invalid, 0 Unknown, 514 Unchecked, 1.1s Time] [2021-11-23 02:57:46,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1624 states. [2021-11-23 02:57:46,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1624 to 1347. [2021-11-23 02:57:46,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1347 states, 1343 states have (on average 1.1839166046165301) internal successors, (1590), 1346 states have internal predecessors, (1590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:46,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1347 states to 1347 states and 1590 transitions. [2021-11-23 02:57:46,210 INFO L78 Accepts]: Start accepts. Automaton has 1347 states and 1590 transitions. Word has length 54 [2021-11-23 02:57:46,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:57:46,210 INFO L470 AbstractCegarLoop]: Abstraction has 1347 states and 1590 transitions. [2021-11-23 02:57:46,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.026315789473684) internal successors, (115), 38 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:57:46,210 INFO L276 IsEmpty]: Start isEmpty. Operand 1347 states and 1590 transitions. [2021-11-23 02:57:46,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 02:57:46,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:57:46,212 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:57:46,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-23 02:57:46,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:46,413 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:57:46,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:57:46,413 INFO L85 PathProgramCache]: Analyzing trace with hash -2099691051, now seen corresponding path program 2 times [2021-11-23 02:57:46,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:57:46,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299514144] [2021-11-23 02:57:46,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:57:46,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:57:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:57:47,226 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 3 proven. 50 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:57:47,226 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:57:47,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299514144] [2021-11-23 02:57:47,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299514144] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:57:47,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412261276] [2021-11-23 02:57:47,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:57:47,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:57:47,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:57:47,227 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:57:47,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 02:57:47,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:57:47,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:57:47,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-23 02:57:47,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:57:47,336 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 [2021-11-23 02:57:47,341 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 [2021-11-23 02:57:47,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-23 02:57:47,631 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-23 02:57:47,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 02:57:48,250 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-23 02:57:48,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 24 [2021-11-23 02:57:48,414 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:57:48,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:57:49,314 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 71 treesize of output 65 [2021-11-23 02:57:49,569 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:57:49,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412261276] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:57:49,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [460157647] [2021-11-23 02:57:49,570 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 02:57:49,570 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:57:49,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:57:49,571 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:57:49,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:57:49,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:57:49,596 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 [2021-11-23 02:57:49,634 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 20 treesize of output 16 [2021-11-23 02:57:49,666 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 23 treesize of output 19 [2021-11-23 02:57:49,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:57:49,764 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:57:49,764 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 87 treesize of output 86 [2021-11-23 02:57:49,814 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 23 treesize of output 19 [2021-11-23 02:57:49,855 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 [2021-11-23 02:57:49,909 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:57:49,910 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 [2021-11-23 02:57:50,860 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:00,999 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56554#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:58:01,000 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:01,000 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:01,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8, 8] total 39 [2021-11-23 02:58:01,000 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124615563] [2021-11-23 02:58:01,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:01,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 02:58:01,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:01,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 02:58:01,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3728, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 02:58:01,002 INFO L87 Difference]: Start difference. First operand 1347 states and 1590 transitions. Second operand has 40 states, 40 states have (on average 3.225) internal successors, (129), 39 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) [2021-11-23 02:58:05,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:05,325 INFO L93 Difference]: Finished difference Result 1381 states and 1621 transitions. [2021-11-23 02:58:05,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 02:58:05,325 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.225) internal successors, (129), 39 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 56 [2021-11-23 02:58:05,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:05,331 INFO L225 Difference]: With dead ends: 1381 [2021-11-23 02:58:05,331 INFO L226 Difference]: Without dead ends: 1381 [2021-11-23 02:58:05,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2947 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=796, Invalid=11636, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 02:58:05,332 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 47 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 682 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 837 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:05,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 571 Invalid, 837 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 682 Invalid, 0 Unknown, 118 Unchecked, 0.5s Time] [2021-11-23 02:58:05,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1381 states. [2021-11-23 02:58:05,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1381 to 1301. [2021-11-23 02:58:05,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1301 states, 1297 states have (on average 1.1819583654587509) internal successors, (1533), 1300 states have internal predecessors, (1533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:05,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1301 states to 1301 states and 1533 transitions. [2021-11-23 02:58:05,350 INFO L78 Accepts]: Start accepts. Automaton has 1301 states and 1533 transitions. Word has length 56 [2021-11-23 02:58:05,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:05,350 INFO L470 AbstractCegarLoop]: Abstraction has 1301 states and 1533 transitions. [2021-11-23 02:58:05,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 3.225) internal successors, (129), 39 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) [2021-11-23 02:58:05,351 INFO L276 IsEmpty]: Start isEmpty. Operand 1301 states and 1533 transitions. [2021-11-23 02:58:05,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:58:05,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:05,353 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:05,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:05,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-23 02:58:05,553 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:58:05,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:05,554 INFO L85 PathProgramCache]: Analyzing trace with hash -706462724, now seen corresponding path program 2 times [2021-11-23 02:58:05,554 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:05,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347176316] [2021-11-23 02:58:05,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:05,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:05,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:05,769 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:58:05,769 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:05,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347176316] [2021-11-23 02:58:05,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347176316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:05,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539850631] [2021-11-23 02:58:05,770 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:58:05,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:05,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:05,771 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:05,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-23 02:58:05,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:58:05,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:05,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 02:58:05,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:05,918 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:58:05,919 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 [2021-11-23 02:58:05,930 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 [2021-11-23 02:58:06,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:06,291 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-23 02:58:06,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2021-11-23 02:58:07,447 INFO L354 Elim1Store]: treesize reduction 45, result has 21.1 percent of original size [2021-11-23 02:58:07,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 32 [2021-11-23 02:58:07,518 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:58:07,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:08,868 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 63 treesize of output 59 [2021-11-23 02:58:09,045 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 02:58:09,045 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539850631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:09,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1518117559] [2021-11-23 02:58:09,046 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 02:58:09,047 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:09,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:09,047 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:09,048 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:09,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:09,081 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 [2021-11-23 02:58:09,122 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 23 treesize of output 19 [2021-11-23 02:58:09,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:09,204 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 20 treesize of output 16 [2021-11-23 02:58:09,281 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:58:09,281 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 87 treesize of output 86 [2021-11-23 02:58:09,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:09,400 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 [2021-11-23 02:58:09,453 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:58:09,453 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 [2021-11-23 02:58:12,519 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:22,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '59736#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:58:22,125 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:22,126 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:22,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 32 [2021-11-23 02:58:22,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479803183] [2021-11-23 02:58:22,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:22,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 02:58:22,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:22,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 02:58:22,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=3260, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:58:22,130 INFO L87 Difference]: Start difference. First operand 1301 states and 1533 transitions. Second operand has 34 states, 33 states have (on average 4.03030303030303) internal successors, (133), 33 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:28,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:28,073 INFO L93 Difference]: Finished difference Result 1365 states and 1597 transitions. [2021-11-23 02:58:28,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 02:58:28,073 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 4.03030303030303) internal successors, (133), 33 states have internal predecessors, (133), 0 states have call successors, (0), 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 [2021-11-23 02:58:28,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:28,079 INFO L225 Difference]: With dead ends: 1365 [2021-11-23 02:58:28,079 INFO L226 Difference]: Without dead ends: 1365 [2021-11-23 02:58:28,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 129 SyntacticMatches, 7 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1954 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=528, Invalid=6278, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 02:58:28,080 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 69 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:28,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 561 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 297 Invalid, 0 Unknown, 209 Unchecked, 0.2s Time] [2021-11-23 02:58:28,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1365 states. [2021-11-23 02:58:28,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1365 to 1282. [2021-11-23 02:58:28,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1282 states, 1278 states have (on average 1.1791862284820032) internal successors, (1507), 1281 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:28,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1282 states to 1282 states and 1507 transitions. [2021-11-23 02:58:28,099 INFO L78 Accepts]: Start accepts. Automaton has 1282 states and 1507 transitions. Word has length 58 [2021-11-23 02:58:28,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:28,099 INFO L470 AbstractCegarLoop]: Abstraction has 1282 states and 1507 transitions. [2021-11-23 02:58:28,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 4.03030303030303) internal successors, (133), 33 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:28,100 INFO L276 IsEmpty]: Start isEmpty. Operand 1282 states and 1507 transitions. [2021-11-23 02:58:28,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:58:28,102 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:28,102 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:28,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:28,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-23 02:58:28,317 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:58:28,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:28,317 INFO L85 PathProgramCache]: Analyzing trace with hash 1626756432, now seen corresponding path program 3 times [2021-11-23 02:58:28,318 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:28,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834749375] [2021-11-23 02:58:28,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:28,318 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:28,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:28,758 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 3 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:58:28,758 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:28,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834749375] [2021-11-23 02:58:28,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834749375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:28,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736139816] [2021-11-23 02:58:28,759 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:58:28,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:28,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:28,761 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:28,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-23 02:58:28,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:58:28,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:58:28,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-23 02:58:28,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:29,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 02:58:29,358 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-23 02:58:29,358 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 30 treesize of output 29 [2021-11-23 02:58:30,974 INFO L354 Elim1Store]: treesize reduction 81, result has 16.5 percent of original size [2021-11-23 02:58:30,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 55 treesize of output 42 [2021-11-23 02:58:31,025 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 5 proven. 35 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:58:31,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:33,845 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse1 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)))) (or (= .cse0 0) (= (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 3)) 0) (not (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse1) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) .cse0)))))) is different from false [2021-11-23 02:58:33,868 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-23 02:58:33,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 243 treesize of output 192 [2021-11-23 02:58:33,877 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:58:33,877 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 188 treesize of output 180 [2021-11-23 02:58:33,930 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-23 02:58:33,930 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 28 treesize of output 22 [2021-11-23 02:58:33,937 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-23 02:58:33,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 43 [2021-11-23 02:58:34,385 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 13 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:58:34,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736139816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:34,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1729263529] [2021-11-23 02:58:34,386 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:58:34,386 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:34,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:34,387 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:34,387 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:34,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,413 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 [2021-11-23 02:58:34,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:34,488 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 23 treesize of output 19 [2021-11-23 02:58:34,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:34,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:34,583 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 91 treesize of output 83 [2021-11-23 02:58:34,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:34,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:58:34,695 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:58:34,695 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 [2021-11-23 02:58:36,303 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:58:45,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62870#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:58:45,831 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:58:45,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:58:45,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23, 23] total 61 [2021-11-23 02:58:45,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665859515] [2021-11-23 02:58:45,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:58:45,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-23 02:58:45,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:58:45,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-23 02:58:45,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=6797, Unknown=1, NotChecked=166, Total=7310 [2021-11-23 02:58:45,833 INFO L87 Difference]: Start difference. First operand 1282 states and 1507 transitions. Second operand has 62 states, 62 states have (on average 2.2419354838709675) internal successors, (139), 61 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) [2021-11-23 02:58:48,625 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~length1~0#1|)) 0) (<= |ULTIMATE.start_main_~length1~0#1| 4) (< 3 |ULTIMATE.start_main_~length1~0#1|))) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse1 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)))) (or (= .cse0 0) (= (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 3)) 0) (not (= (select (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse1) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) .cse0)))))) (<= |c_ULTIMATE.start_main_~length1~0#1| 4) (= |c_ULTIMATE.start_main_~length1~0#1| 4) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0) (<= |c_ULTIMATE.start_main_~i~0#1| 4) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (< 3 |c_ULTIMATE.start_main_~length1~0#1|)) is different from false [2021-11-23 02:58:50,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:58:50,731 INFO L93 Difference]: Finished difference Result 1907 states and 2225 transitions. [2021-11-23 02:58:50,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 02:58:50,732 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.2419354838709675) internal successors, (139), 61 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 58 [2021-11-23 02:58:50,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:58:50,742 INFO L225 Difference]: With dead ends: 1907 [2021-11-23 02:58:50,742 INFO L226 Difference]: Without dead ends: 1907 [2021-11-23 02:58:50,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 3243 ImplicationChecksByTransitivity, 17.3s TimeCoverageRelationStatistics Valid=569, Invalid=11869, Unknown=2, NotChecked=442, Total=12882 [2021-11-23 02:58:50,744 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 294 mSDsluCounter, 3701 mSDsCounter, 0 mSdLazyCounter, 2677 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 3321 SdHoareTripleChecker+Invalid, 4047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 2677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1347 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:58:50,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [294 Valid, 3321 Invalid, 4047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 2677 Invalid, 0 Unknown, 1347 Unchecked, 1.4s Time] [2021-11-23 02:58:50,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1907 states. [2021-11-23 02:58:50,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1907 to 1223. [2021-11-23 02:58:50,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1223 states, 1219 states have (on average 1.1730926989335522) internal successors, (1430), 1222 states have internal predecessors, (1430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:58:50,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1223 states to 1223 states and 1430 transitions. [2021-11-23 02:58:50,765 INFO L78 Accepts]: Start accepts. Automaton has 1223 states and 1430 transitions. Word has length 58 [2021-11-23 02:58:50,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:58:50,765 INFO L470 AbstractCegarLoop]: Abstraction has 1223 states and 1430 transitions. [2021-11-23 02:58:50,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.2419354838709675) internal successors, (139), 61 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) [2021-11-23 02:58:50,766 INFO L276 IsEmpty]: Start isEmpty. Operand 1223 states and 1430 transitions. [2021-11-23 02:58:50,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:58:50,767 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:58:50,767 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:58:50,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-23 02:58:50,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:50,968 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:58:50,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:58:50,968 INFO L85 PathProgramCache]: Analyzing trace with hash 417995507, now seen corresponding path program 4 times [2021-11-23 02:58:50,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:58:50,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087909051] [2021-11-23 02:58:50,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:58:50,968 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:58:50,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:51,184 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:58:51,184 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:58:51,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087909051] [2021-11-23 02:58:51,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087909051] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:58:51,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [444481847] [2021-11-23 02:58:51,185 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:58:51,185 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:58:51,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:58:51,189 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:58:51,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 02:58:51,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:58:51,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:58:51,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:51,338 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:58:51,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:58:51,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:58:51,640 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:58:51,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:58:51,932 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:58:51,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [444481847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:58:51,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001258578] [2021-11-23 02:58:51,934 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:58:51,935 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:58:51,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:58:51,935 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:58:51,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:58:51,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:51,978 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 [2021-11-23 02:58:52,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:52,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:52,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:58:52,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:58:52,140 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 91 treesize of output 83 [2021-11-23 02:58:52,181 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 23 treesize of output 19 [2021-11-23 02:58:52,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:58:52,244 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:58:52,245 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 [2021-11-23 02:58:53,899 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:01,582 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66451#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:59:01,583 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:01,583 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:01,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 24 [2021-11-23 02:59:01,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697084154] [2021-11-23 02:59:01,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:01,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:59:01,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:01,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:59:01,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=2044, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:59:01,584 INFO L87 Difference]: Start difference. First operand 1223 states and 1430 transitions. Second operand has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:02,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:02,135 INFO L93 Difference]: Finished difference Result 1403 states and 1622 transitions. [2021-11-23 02:59:02,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:59:02,135 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 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 [2021-11-23 02:59:02,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:02,142 INFO L225 Difference]: With dead ends: 1403 [2021-11-23 02:59:02,142 INFO L226 Difference]: Without dead ends: 1399 [2021-11-23 02:59:02,143 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1137 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=441, Invalid=3099, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 02:59:02,144 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 185 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:02,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 221 Invalid, 412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:59:02,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1399 states. [2021-11-23 02:59:02,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1399 to 1220. [2021-11-23 02:59:02,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1220 states, 1216 states have (on average 1.171875) internal successors, (1425), 1219 states have internal predecessors, (1425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:02,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1220 states to 1220 states and 1425 transitions. [2021-11-23 02:59:02,165 INFO L78 Accepts]: Start accepts. Automaton has 1220 states and 1425 transitions. Word has length 58 [2021-11-23 02:59:02,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:02,165 INFO L470 AbstractCegarLoop]: Abstraction has 1220 states and 1425 transitions. [2021-11-23 02:59:02,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.28) internal successors, (82), 24 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:02,166 INFO L276 IsEmpty]: Start isEmpty. Operand 1220 states and 1425 transitions. [2021-11-23 02:59:02,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 02:59:02,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:02,168 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:02,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-23 02:59:02,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-23 02:59:02,381 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:59:02,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:02,381 INFO L85 PathProgramCache]: Analyzing trace with hash 1428497632, now seen corresponding path program 1 times [2021-11-23 02:59:02,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:02,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893022706] [2021-11-23 02:59:02,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:02,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:02,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:02,686 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:59:02,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:02,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893022706] [2021-11-23 02:59:02,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893022706] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:02,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036604667] [2021-11-23 02:59:02,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:02,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:02,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:02,693 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:02,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-23 02:59:02,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:02,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-23 02:59:02,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:02,832 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 [2021-11-23 02:59:03,005 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 13 treesize of output 9 [2021-11-23 02:59:03,032 INFO L354 Elim1Store]: treesize reduction 37, result has 19.6 percent of original size [2021-11-23 02:59:03,032 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 56 treesize of output 55 [2021-11-23 02:59:03,789 INFO L354 Elim1Store]: treesize reduction 14, result has 6.7 percent of original size [2021-11-23 02:59:03,790 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 29 treesize of output 14 [2021-11-23 02:59:03,796 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:59:03,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:04,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 02:59:05,069 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 02:59:05,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036604667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:05,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1323853651] [2021-11-23 02:59:05,070 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 02:59:05,070 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:59:05,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:59:05,071 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:59:05,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:59:05,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:05,101 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 [2021-11-23 02:59:05,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:59:05,157 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 23 treesize of output 19 [2021-11-23 02:59:05,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:05,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:05,220 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 91 treesize of output 83 [2021-11-23 02:59:05,265 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 23 treesize of output 19 [2021-11-23 02:59:05,288 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 [2021-11-23 02:59:05,334 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:59:05,334 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 [2021-11-23 02:59:08,684 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:18,797 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69498#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:59:18,797 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:18,797 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:18,798 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 28 [2021-11-23 02:59:18,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694750559] [2021-11-23 02:59:18,798 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:18,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:59:18,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:18,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:59:18,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=2955, Unknown=1, NotChecked=0, Total=3192 [2021-11-23 02:59:18,799 INFO L87 Difference]: Start difference. First operand 1220 states and 1425 transitions. Second operand has 29 states, 29 states have (on average 3.413793103448276) internal successors, (99), 28 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) [2021-11-23 02:59:19,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:19,088 INFO L93 Difference]: Finished difference Result 1228 states and 1432 transitions. [2021-11-23 02:59:19,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:59:19,089 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.413793103448276) internal successors, (99), 28 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 59 [2021-11-23 02:59:19,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:19,092 INFO L225 Difference]: With dead ends: 1228 [2021-11-23 02:59:19,093 INFO L226 Difference]: Without dead ends: 1225 [2021-11-23 02:59:19,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 121 SyntacticMatches, 13 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1257 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=289, Invalid=3616, Unknown=1, NotChecked=0, Total=3906 [2021-11-23 02:59:19,094 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 30 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:19,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 395 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 173 Invalid, 0 Unknown, 64 Unchecked, 0.1s Time] [2021-11-23 02:59:19,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1225 states. [2021-11-23 02:59:19,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1225 to 1220. [2021-11-23 02:59:19,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1220 states, 1216 states have (on average 1.1710526315789473) internal successors, (1424), 1219 states have internal predecessors, (1424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:19,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1220 states to 1220 states and 1424 transitions. [2021-11-23 02:59:19,111 INFO L78 Accepts]: Start accepts. Automaton has 1220 states and 1424 transitions. Word has length 59 [2021-11-23 02:59:19,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:19,111 INFO L470 AbstractCegarLoop]: Abstraction has 1220 states and 1424 transitions. [2021-11-23 02:59:19,112 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.413793103448276) internal successors, (99), 28 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) [2021-11-23 02:59:19,112 INFO L276 IsEmpty]: Start isEmpty. Operand 1220 states and 1424 transitions. [2021-11-23 02:59:19,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:59:19,113 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:19,113 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:19,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:19,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-23 02:59:19,314 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:59:19,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:19,314 INFO L85 PathProgramCache]: Analyzing trace with hash 600497036, now seen corresponding path program 4 times [2021-11-23 02:59:19,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:19,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061575766] [2021-11-23 02:59:19,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:19,315 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:19,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:19,557 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:59:19,557 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:19,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061575766] [2021-11-23 02:59:19,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061575766] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:19,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038220862] [2021-11-23 02:59:19,558 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:59:19,558 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:19,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:19,561 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:19,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 02:59:19,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:19,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-23 02:59:19,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:19,693 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-23 02:59:19,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-23 02:59:19,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:59:20,379 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 16 proven. 21 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:59:20,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:21,139 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 25 proven. 12 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-23 02:59:21,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038220862] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:21,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503363477] [2021-11-23 02:59:21,141 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:59:21,141 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:59:21,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:59:21,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:59:21,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:59:21,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,170 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 [2021-11-23 02:59:21,214 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 20 treesize of output 16 [2021-11-23 02:59:21,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:21,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:21,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:21,327 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 91 treesize of output 83 [2021-11-23 02:59:21,366 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 23 treesize of output 19 [2021-11-23 02:59:21,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:59:21,429 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:59:21,429 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 [2021-11-23 02:59:23,099 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:32,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72381#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 02:59:32,366 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:32,367 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:32,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2021-11-23 02:59:32,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059050870] [2021-11-23 02:59:32,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:32,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-23 02:59:32,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:32,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-23 02:59:32,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=3831, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:59:32,369 INFO L87 Difference]: Start difference. First operand 1220 states and 1424 transitions. Second operand has 41 states, 40 states have (on average 3.525) internal successors, (141), 40 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:34,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:34,483 INFO L93 Difference]: Finished difference Result 1833 states and 2133 transitions. [2021-11-23 02:59:34,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 02:59:34,484 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 3.525) internal successors, (141), 40 states have internal predecessors, (141), 0 states have call successors, (0), 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 60 [2021-11-23 02:59:34,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:34,487 INFO L225 Difference]: With dead ends: 1833 [2021-11-23 02:59:34,487 INFO L226 Difference]: Without dead ends: 1833 [2021-11-23 02:59:34,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2060 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=1003, Invalid=7007, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 02:59:34,488 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 552 mSDsluCounter, 1306 mSDsCounter, 0 mSdLazyCounter, 1921 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 1181 SdHoareTripleChecker+Invalid, 1970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:34,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 1181 Invalid, 1970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1921 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 02:59:34,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1833 states. [2021-11-23 02:59:34,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1833 to 1212. [2021-11-23 02:59:34,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1212 states, 1208 states have (on average 1.1688741721854305) internal successors, (1412), 1211 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:34,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1212 states to 1212 states and 1412 transitions. [2021-11-23 02:59:34,528 INFO L78 Accepts]: Start accepts. Automaton has 1212 states and 1412 transitions. Word has length 60 [2021-11-23 02:59:34,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:34,529 INFO L470 AbstractCegarLoop]: Abstraction has 1212 states and 1412 transitions. [2021-11-23 02:59:34,529 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 3.525) internal successors, (141), 40 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:34,529 INFO L276 IsEmpty]: Start isEmpty. Operand 1212 states and 1412 transitions. [2021-11-23 02:59:34,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:59:34,531 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:34,531 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:34,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:34,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:34,745 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:59:34,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:34,746 INFO L85 PathProgramCache]: Analyzing trace with hash -608263889, now seen corresponding path program 5 times [2021-11-23 02:59:34,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:34,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943949343] [2021-11-23 02:59:34,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:34,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:34,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:34,942 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 3 proven. 30 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-23 02:59:34,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:34,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943949343] [2021-11-23 02:59:34,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943949343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:34,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806447852] [2021-11-23 02:59:34,943 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:59:34,943 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:34,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:34,945 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:34,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 02:59:35,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:59:35,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:59:35,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 02:59:35,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:35,154 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 02:59:35,155 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 [2021-11-23 02:59:35,169 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 [2021-11-23 02:59:35,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-23 02:59:35,468 INFO L354 Elim1Store]: treesize reduction 47, result has 19.0 percent of original size [2021-11-23 02:59:35,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 31 [2021-11-23 02:59:36,057 INFO L354 Elim1Store]: treesize reduction 45, result has 18.2 percent of original size [2021-11-23 02:59:36,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 24 [2021-11-23 02:59:36,135 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 02:59:36,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:36,916 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 71 treesize of output 65 [2021-11-23 02:59:37,210 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 02:59:37,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806447852] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:37,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [462060381] [2021-11-23 02:59:37,211 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-23 02:59:37,212 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:59:37,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:59:37,212 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:59:37,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:59:37,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:37,247 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 [2021-11-23 02:59:37,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:37,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:37,345 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 23 treesize of output 19 [2021-11-23 02:59:37,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:37,396 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 91 treesize of output 83 [2021-11-23 02:59:37,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:37,458 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 [2021-11-23 02:59:37,508 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:59:37,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-23 02:59:39,111 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:49,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75881#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| 1) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|)) (and (<= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 0 |#NULL.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| 1) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= |ULTIMATE.start_cstrncmp_~s2#1.offset| 1) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_cstrncmp_#in~s1#1.offset| 1) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))) (or (and (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0))) (and (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (= |ULTIMATE.start_cstrlen_~s~0#1.offset| (+ |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrlen_~str#1.offset|)) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (= |ULTIMATE.start_cstrlen_#res#1| |ULTIMATE.start_cstrstr_~len~0#1|))))' at error location [2021-11-23 02:59:49,234 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:49,234 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:49,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 27 [2021-11-23 02:59:49,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855670187] [2021-11-23 02:59:49,234 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:49,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:59:49,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:49,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:59:49,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=2279, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:59:49,235 INFO L87 Difference]: Start difference. First operand 1212 states and 1412 transitions. Second operand has 27 states, 27 states have (on average 4.296296296296297) internal successors, (116), 27 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:50,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:59:50,304 INFO L93 Difference]: Finished difference Result 1647 states and 1898 transitions. [2021-11-23 02:59:50,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 02:59:50,305 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 4.296296296296297) internal successors, (116), 27 states have internal predecessors, (116), 0 states have call successors, (0), 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 60 [2021-11-23 02:59:50,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:59:50,307 INFO L225 Difference]: With dead ends: 1647 [2021-11-23 02:59:50,307 INFO L226 Difference]: Without dead ends: 1629 [2021-11-23 02:59:50,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 141 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1250 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=349, Invalid=4763, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 02:59:50,308 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 15 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:59:50,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 464 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 171 Invalid, 0 Unknown, 90 Unchecked, 0.1s Time] [2021-11-23 02:59:50,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1629 states. [2021-11-23 02:59:50,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1629 to 1438. [2021-11-23 02:59:50,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1438 states, 1434 states have (on average 1.1701534170153418) internal successors, (1678), 1437 states have internal predecessors, (1678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:50,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1438 states to 1438 states and 1678 transitions. [2021-11-23 02:59:50,339 INFO L78 Accepts]: Start accepts. Automaton has 1438 states and 1678 transitions. Word has length 60 [2021-11-23 02:59:50,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:59:50,339 INFO L470 AbstractCegarLoop]: Abstraction has 1438 states and 1678 transitions. [2021-11-23 02:59:50,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 4.296296296296297) internal successors, (116), 27 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:59:50,340 INFO L276 IsEmpty]: Start isEmpty. Operand 1438 states and 1678 transitions. [2021-11-23 02:59:50,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:59:50,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:59:50,341 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:59:50,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-23 02:59:50,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-23 02:59:50,542 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 02:59:50,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:59:50,542 INFO L85 PathProgramCache]: Analyzing trace with hash 979213551, now seen corresponding path program 3 times [2021-11-23 02:59:50,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:59:50,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674870868] [2021-11-23 02:59:50,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:59:50,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:59:50,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:59:50,726 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:59:50,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:59:50,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674870868] [2021-11-23 02:59:50,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674870868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:59:50,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1552422726] [2021-11-23 02:59:50,727 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:59:50,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:59:50,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:59:50,729 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:59:50,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-23 02:59:50,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:59:50,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:59:50,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 02:59:50,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:59:51,068 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:59:51,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:59:51,149 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:59:51,150 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 19 treesize of output 23 [2021-11-23 02:59:51,355 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 46 proven. 5 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:59:51,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1552422726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:59:51,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795730322] [2021-11-23 02:59:51,356 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-23 02:59:51,356 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:59:51,356 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:59:51,357 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:59:51,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:59:51,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:59:51,392 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 [2021-11-23 02:59:51,418 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 23 treesize of output 19 [2021-11-23 02:59:51,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:51,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 02:59:51,544 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 02:59:51,544 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 87 treesize of output 86 [2021-11-23 02:59:51,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 02:59:51,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 02:59:51,703 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 02:59:51,703 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 [2021-11-23 02:59:52,796 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:59:59,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79419#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 02:59:59,461 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:59:59,462 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:59:59,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 22 [2021-11-23 02:59:59,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942119468] [2021-11-23 02:59:59,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:59:59,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:59:59,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:59:59,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:59:59,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=1634, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:59:59,463 INFO L87 Difference]: Start difference. First operand 1438 states and 1678 transitions. Second operand has 23 states, 22 states have (on average 4.0) internal successors, (88), 23 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) [2021-11-23 03:00:00,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:00:00,338 INFO L93 Difference]: Finished difference Result 1943 states and 2233 transitions. [2021-11-23 03:00:00,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 03:00:00,339 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 4.0) internal successors, (88), 23 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) Word has length 61 [2021-11-23 03:00:00,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:00:00,341 INFO L225 Difference]: With dead ends: 1943 [2021-11-23 03:00:00,341 INFO L226 Difference]: Without dead ends: 1689 [2021-11-23 03:00:00,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1593 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=823, Invalid=3599, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 03:00:00,342 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 191 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:00:00,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 371 Invalid, 666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 647 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:00:00,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1689 states. [2021-11-23 03:00:00,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1689 to 1078. [2021-11-23 03:00:00,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1078 states, 1074 states have (on average 1.170391061452514) internal successors, (1257), 1077 states have internal predecessors, (1257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:00,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1078 states to 1078 states and 1257 transitions. [2021-11-23 03:00:00,356 INFO L78 Accepts]: Start accepts. Automaton has 1078 states and 1257 transitions. Word has length 61 [2021-11-23 03:00:00,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:00:00,356 INFO L470 AbstractCegarLoop]: Abstraction has 1078 states and 1257 transitions. [2021-11-23 03:00:00,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 4.0) internal successors, (88), 23 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) [2021-11-23 03:00:00,356 INFO L276 IsEmpty]: Start isEmpty. Operand 1078 states and 1257 transitions. [2021-11-23 03:00:00,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 03:00:00,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:00:00,358 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:00:00,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-23 03:00:00,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:00,558 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 03:00:00,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:00:00,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1768757805, now seen corresponding path program 3 times [2021-11-23 03:00:00,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:00:00,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [162669983] [2021-11-23 03:00:00,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:00:00,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:00:00,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:00:00,805 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 29 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:00,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:00:00,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [162669983] [2021-11-23 03:00:00,805 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [162669983] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:00:00,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455714357] [2021-11-23 03:00:00,806 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:00:00,806 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:00,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:00:00,807 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:00:00,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 03:00:00,994 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:00:00,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:00:00,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-23 03:00:01,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:00:01,354 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:01,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:00:01,789 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 [2021-11-23 03:00:01,809 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 23 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:01,809 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455714357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:00:01,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [176118250] [2021-11-23 03:00:01,811 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 03:00:01,811 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:00:01,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:00:01,811 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:00:01,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:00:01,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:01,831 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 [2021-11-23 03:00:01,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 03:00:01,906 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 23 treesize of output 19 [2021-11-23 03:00:01,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 03:00:02,002 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 03:00:02,002 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 87 treesize of output 86 [2021-11-23 03:00:02,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 03:00:02,082 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 14 treesize of output 10 [2021-11-23 03:00:02,132 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 03:00:02,133 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 [2021-11-23 03:00:07,640 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:00:18,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82916#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (or (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= |ULTIMATE.start_cstrncmp_~s1#1.offset| (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|)) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncmp_~s1#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (not (= (select (select |#memory_int| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ (- 1) |ULTIMATE.start_cstrncmp_~s1#1.offset|)) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0)) (and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (= |ULTIMATE.start_cstrstr_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_cstrstr_~sc~0#1| |ULTIMATE.start_cstrstr_~c~0#1|) (<= |ULTIMATE.start_cstrstr_~s#1.offset| (select |#length| |ULTIMATE.start_cstrstr_~s#1.base|)) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrstr_~s#1.base|) (= |ULTIMATE.start_cstrstr_~find#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (not (= (mod |ULTIMATE.start_cstrncmp_~n#1| 4294967296) 0)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrstr_~find#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (= |ULTIMATE.start_cstrncmp_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |ULTIMATE.start_cstrncmp_~s2#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (= (select |#valid| |ULTIMATE.start_cstrstr_~s#1.base|) 1) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrncmp_~n#1|) (= |ULTIMATE.start_cstrncmp_~s2#1.base| |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (not (= |ULTIMATE.start_cstrstr_~sc~0#1| 0)) (= |ULTIMATE.start_cstrstr_~sc~0#1| (select (select |#memory_int| |ULTIMATE.start_cstrstr_~s#1.base|) (+ (- 1) |ULTIMATE.start_cstrstr_~s#1.offset|))) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_~s#1.base|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (= |ULTIMATE.start_cstrncmp_#in~s1#1.base| |ULTIMATE.start_cstrncmp_~s1#1.base|) (= |ULTIMATE.start_cstrncmp_#in~n#1| |ULTIMATE.start_cstrstr_~len~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))))' at error location [2021-11-23 03:00:18,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:00:18,672 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:00:18,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 25 [2021-11-23 03:00:18,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125217306] [2021-11-23 03:00:18,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:00:18,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 03:00:18,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:00:18,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 03:00:18,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=2649, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 03:00:18,674 INFO L87 Difference]: Start difference. First operand 1078 states and 1257 transitions. Second operand has 27 states, 26 states have (on average 4.6923076923076925) internal successors, (122), 26 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:19,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:00:19,664 INFO L93 Difference]: Finished difference Result 1261 states and 1455 transitions. [2021-11-23 03:00:19,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 03:00:19,665 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.6923076923076925) internal successors, (122), 26 states have internal predecessors, (122), 0 states have call successors, (0), 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 [2021-11-23 03:00:19,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:00:19,669 INFO L225 Difference]: With dead ends: 1261 [2021-11-23 03:00:19,669 INFO L226 Difference]: Without dead ends: 1261 [2021-11-23 03:00:19,670 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1368 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=615, Invalid=4355, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 03:00:19,670 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 499 mSDsluCounter, 574 mSDsCounter, 0 mSdLazyCounter, 927 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 499 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 927 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:00:19,671 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [499 Valid, 532 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 927 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:00:19,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1261 states. [2021-11-23 03:00:19,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1261 to 1070. [2021-11-23 03:00:19,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1070 states, 1066 states have (on average 1.1697936210131332) internal successors, (1247), 1069 states have internal predecessors, (1247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:19,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1070 states to 1070 states and 1247 transitions. [2021-11-23 03:00:19,689 INFO L78 Accepts]: Start accepts. Automaton has 1070 states and 1247 transitions. Word has length 64 [2021-11-23 03:00:19,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:00:19,689 INFO L470 AbstractCegarLoop]: Abstraction has 1070 states and 1247 transitions. [2021-11-23 03:00:19,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.6923076923076925) internal successors, (122), 26 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:19,690 INFO L276 IsEmpty]: Start isEmpty. Operand 1070 states and 1247 transitions. [2021-11-23 03:00:19,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 03:00:19,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:00:19,692 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:00:19,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 03:00:19,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:19,912 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 03:00:19,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:00:19,913 INFO L85 PathProgramCache]: Analyzing trace with hash 958595884, now seen corresponding path program 2 times [2021-11-23 03:00:19,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:00:19,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593390883] [2021-11-23 03:00:19,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:00:19,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:00:19,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:00:20,389 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 11 proven. 38 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:20,389 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:00:20,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593390883] [2021-11-23 03:00:20,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593390883] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:00:20,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343277818] [2021-11-23 03:00:20,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:00:20,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:20,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:00:20,392 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:00:20,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 03:00:20,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 03:00:20,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:00:20,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-23 03:00:20,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:00:20,541 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-23 03:00:20,541 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 [2021-11-23 03:00:20,549 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 [2021-11-23 03:00:20,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 03:00:20,946 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-23 03:00:20,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2021-11-23 03:00:23,781 INFO L354 Elim1Store]: treesize reduction 45, result has 21.1 percent of original size [2021-11-23 03:00:23,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 44 treesize of output 32 [2021-11-23 03:00:23,909 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 14 refuted. 3 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-23 03:00:23,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:00:24,872 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 71 treesize of output 65 [2021-11-23 03:00:25,253 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2021-11-23 03:00:25,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343277818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:00:25,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1653818850] [2021-11-23 03:00:25,255 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 03:00:25,255 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:00:25,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:00:25,255 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:00:25,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:00:25,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:25,283 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 [2021-11-23 03:00:25,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 03:00:25,352 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 23 treesize of output 19 [2021-11-23 03:00:25,385 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 20 treesize of output 16 [2021-11-23 03:00:25,444 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-23 03:00:25,444 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 87 treesize of output 86 [2021-11-23 03:00:25,498 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 23 treesize of output 19 [2021-11-23 03:00:25,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 03:00:25,568 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 03:00:25,568 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 [2021-11-23 03:00:29,293 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:00:40,484 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85726#(and (<= |ULTIMATE.start_cstrstr_~find#1.offset| 1) (<= |ULTIMATE.start_cstrstr_#in~find#1.offset| 0) (<= 0 |ULTIMATE.start_cstrlen_~str#1.base|) (= |ULTIMATE.start_cstrstr_~s#1.base| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= 1 |ULTIMATE.start_cstrlen_~s~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.base|) (<= |ULTIMATE.start_cstrlen_~str#1.offset| 1) (<= 1 |ULTIMATE.start_cstrlen_#in~str#1.offset|) (<= 1 |ULTIMATE.start_cstrlen_~str#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_#in~s#1.base|) (= (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1) |ULTIMATE.start_cstrstr_~s#1.offset|) (<= 0 |ULTIMATE.start_cstrlen_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= |ULTIMATE.start_cstrstr_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 1 |ULTIMATE.start_cstrstr_~find#1.offset|) (<= 0 |ULTIMATE.start_cstrstr_~find#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrstr_#in~find#1.base|) (<= 0 |ULTIMATE.start_cstrlen_#in~str#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_#t~malloc22#1.base|) (= |ULTIMATE.start_main_#t~malloc23#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.base|) (<= |ULTIMATE.start_cstrlen_#in~str#1.offset| 1) (<= 1 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrstr_#t~post17#1.offset|) (= |#NULL.offset| 0) (< (select |#length| |ULTIMATE.start_cstrstr_#t~post17#1.base|) (+ |ULTIMATE.start_cstrstr_#t~post17#1.offset| 1)) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-23 03:00:40,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:00:40,484 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:00:40,485 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9, 9] total 34 [2021-11-23 03:00:40,485 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696823622] [2021-11-23 03:00:40,485 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:00:40,485 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 03:00:40,485 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:00:40,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 03:00:40,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=3654, Unknown=1, NotChecked=0, Total=3906 [2021-11-23 03:00:40,486 INFO L87 Difference]: Start difference. First operand 1070 states and 1247 transitions. Second operand has 35 states, 35 states have (on average 3.8857142857142857) internal successors, (136), 34 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:42,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:00:42,482 INFO L93 Difference]: Finished difference Result 1123 states and 1298 transitions. [2021-11-23 03:00:42,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 03:00:42,482 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.8857142857142857) internal successors, (136), 34 states have internal predecessors, (136), 0 states have call successors, (0), 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 65 [2021-11-23 03:00:42,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:00:42,484 INFO L225 Difference]: With dead ends: 1123 [2021-11-23 03:00:42,484 INFO L226 Difference]: Without dead ends: 1111 [2021-11-23 03:00:42,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2100 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=549, Invalid=7822, Unknown=1, NotChecked=0, Total=8372 [2021-11-23 03:00:42,486 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 58 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:00:42,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 543 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 299 Invalid, 0 Unknown, 96 Unchecked, 0.2s Time] [2021-11-23 03:00:42,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1111 states. [2021-11-23 03:00:42,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1111 to 850. [2021-11-23 03:00:42,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 850 states, 847 states have (on average 1.1593860684769777) internal successors, (982), 849 states have internal predecessors, (982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:42,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 850 states to 850 states and 982 transitions. [2021-11-23 03:00:42,502 INFO L78 Accepts]: Start accepts. Automaton has 850 states and 982 transitions. Word has length 65 [2021-11-23 03:00:42,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:00:42,502 INFO L470 AbstractCegarLoop]: Abstraction has 850 states and 982 transitions. [2021-11-23 03:00:42,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.8857142857142857) internal successors, (136), 34 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:00:42,503 INFO L276 IsEmpty]: Start isEmpty. Operand 850 states and 982 transitions. [2021-11-23 03:00:42,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 03:00:42,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:00:42,504 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:00:42,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 03:00:42,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:42,705 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-23 03:00:42,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:00:42,705 INFO L85 PathProgramCache]: Analyzing trace with hash 308965612, now seen corresponding path program 1 times [2021-11-23 03:00:42,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:00:42,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917918747] [2021-11-23 03:00:42,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:00:42,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:00:42,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:00:43,260 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:43,260 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:00:43,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917918747] [2021-11-23 03:00:43,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917918747] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:00:43,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601174186] [2021-11-23 03:00:43,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:00:43,261 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:00:43,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:00:43,265 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:00:43,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_701b8d95-69d9-48a7-9afb-334b81f033de/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 03:00:43,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:00:43,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-23 03:00:43,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:00:43,418 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 [2021-11-23 03:00:43,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-23 03:00:43,865 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 03:00:43,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 03:00:45,246 INFO L354 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2021-11-23 03:00:45,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 23 [2021-11-23 03:00:45,291 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:45,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:00:45,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-23 03:00:46,079 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-23 03:00:46,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601174186] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:00:46,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [213220771] [2021-11-23 03:00:46,080 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-23 03:00:46,080 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:00:46,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:00:46,081 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:00:46,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:00:46,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:46,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 03:00:46,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-23 03:00:46,181 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 23 treesize of output 19 [2021-11-23 03:00:46,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 03:00:46,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:00:46,263 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 91 treesize of output 83 [2021-11-23 03:00:46,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-23 03:00:46,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-23 03:00:46,368 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-23 03:00:46,368 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 [2021-11-23 03:00:50,133 INFO L180 IcfgInterpreter]: Interpretation finished