./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 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/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_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:36:08,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:36:08,695 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:36:08,737 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:36:08,739 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:36:08,741 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:36:08,744 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:36:08,750 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:36:08,753 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:36:08,754 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:36:08,755 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:36:08,757 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:36:08,759 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:36:08,762 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:36:08,764 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:36:08,766 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:36:08,768 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:36:08,775 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:36:08,777 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:36:08,783 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:36:08,784 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:36:08,786 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:36:08,787 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:36:08,788 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:36:08,792 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:36:08,792 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:36:08,792 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:36:08,793 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:36:08,794 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:36:08,795 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:36:08,795 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:36:08,796 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:36:08,797 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:36:08,798 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:36:08,799 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:36:08,800 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:36:08,800 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:36:08,801 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:36:08,801 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:36:08,802 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:36:08,803 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:36:08,804 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-25 20:36:08,829 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:36:08,829 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:36:08,829 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:36:08,830 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:36:08,831 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:36:08,831 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:36:08,831 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:36:08,832 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:36:08,832 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:36:08,833 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:36:08,833 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:36:08,833 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:36:08,834 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:36:08,834 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:36:08,835 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:36:08,835 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:36:08,835 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:36:08,836 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:36:08,836 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-25 20:36:08,837 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-25 20:36:08,837 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:36:08,838 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:36:08,838 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-25 20:36:08,838 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:36:08,839 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:36:08,839 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:36:08,840 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-25 20:36:08,840 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-25 20:36:08,840 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-25 20:36:08,840 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:36:08,841 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 20:36:08,841 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:36:08,841 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:36:08,841 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:36:08,842 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:36:08,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:36:08,842 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:36:08,842 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:36:08,842 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:36:08,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:36:08,843 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:36:08,843 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:36:08,843 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_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 991fb09b573d5827d0db553f1ea89a581f5a664ba8b68d6f14a043df738f2f6d [2021-11-25 20:36:09,059 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:36:09,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:36:09,080 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:36:09,082 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:36:09,082 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:36:09,084 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-25 20:36:09,151 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/data/95d0a92ec/11893b6a2ce34aabb4a985bb21b291a9/FLAG4f8279418 [2021-11-25 20:36:09,738 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:36:09,739 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/sv-benchmarks/c/array-memsafety/openbsd_cstrstr-alloca-2.i [2021-11-25 20:36:09,752 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/data/95d0a92ec/11893b6a2ce34aabb4a985bb21b291a9/FLAG4f8279418 [2021-11-25 20:36:10,061 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/data/95d0a92ec/11893b6a2ce34aabb4a985bb21b291a9 [2021-11-25 20:36:10,063 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:36:10,064 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:36:10,066 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:36:10,066 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:36:10,081 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:36:10,082 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27f70535 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10, skipping insertion in model container [2021-11-25 20:36:10,083 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,090 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:36:10,126 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:36:10,503 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:36:10,510 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:36:10,548 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:36:10,580 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:36:10,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10 WrapperNode [2021-11-25 20:36:10,581 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:36:10,582 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:36:10,582 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:36:10,582 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:36:10,589 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,603 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,628 INFO L137 Inliner]: procedures = 119, calls = 23, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 160 [2021-11-25 20:36:10,629 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:36:10,629 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:36:10,629 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:36:10,630 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:36:10,637 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,637 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,642 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,642 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,669 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,674 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,683 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,687 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:36:10,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:36:10,688 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:36:10,688 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:36:10,691 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (1/1) ... [2021-11-25 20:36:10,702 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:36:10,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:10,724 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:36:10,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:36:10,772 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:36:10,774 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:36:10,774 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:36:10,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:36:10,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:36:10,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:36:10,911 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:36:10,913 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:36:11,265 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:36:11,325 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:36:11,325 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-25 20:36:11,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:36:11 BoogieIcfgContainer [2021-11-25 20:36:11,328 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:36:11,330 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:36:11,330 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:36:11,333 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:36:11,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:36:10" (1/3) ... [2021-11-25 20:36:11,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@552b5dc3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:36:11, skipping insertion in model container [2021-11-25 20:36:11,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:36:10" (2/3) ... [2021-11-25 20:36:11,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@552b5dc3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:36:11, skipping insertion in model container [2021-11-25 20:36:11,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:36:11" (3/3) ... [2021-11-25 20:36:11,339 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrstr-alloca-2.i [2021-11-25 20:36:11,343 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:36:11,344 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 25 error locations. [2021-11-25 20:36:11,381 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:36:11,388 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 20:36:11,388 INFO L340 AbstractCegarLoop]: Starting to check reachability of 25 error locations. [2021-11-25 20:36:11,402 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) [2021-11-25 20:36:11,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 20:36:11,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:11,408 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 20:36:11,408 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:11,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:11,414 INFO L85 PathProgramCache]: Analyzing trace with hash 220807, now seen corresponding path program 1 times [2021-11-25 20:36:11,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:11,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836160700] [2021-11-25 20:36:11,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:11,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:11,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:11,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:36:11,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:11,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836160700] [2021-11-25 20:36:11,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836160700] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:11,662 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:11,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 20:36:11,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031644208] [2021-11-25 20:36:11,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:11,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:36:11,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:11,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:36:11,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:36:11,696 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) [2021-11-25 20:36:11,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:11,761 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-11-25 20:36:11,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:36:11,764 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-25 20:36:11,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:11,771 INFO L225 Difference]: With dead ends: 58 [2021-11-25 20:36:11,771 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 20:36:11,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:36:11,777 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 63 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:11,778 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 36 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:36:11,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 20:36:11,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-25 20:36:11,806 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) [2021-11-25 20:36:11,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-25 20:36:11,809 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 3 [2021-11-25 20:36:11,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:11,809 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-25 20:36:11,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:11,810 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-25 20:36:11,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-25 20:36:11,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:11,810 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-25 20:36:11,811 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 20:36:11,811 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:11,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:11,812 INFO L85 PathProgramCache]: Analyzing trace with hash 220808, now seen corresponding path program 1 times [2021-11-25 20:36:11,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:11,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853951788] [2021-11-25 20:36:11,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:11,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:11,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:11,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:36:11,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:11,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853951788] [2021-11-25 20:36:11,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1853951788] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:11,896 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:11,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:36:11,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752109696] [2021-11-25 20:36:11,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:11,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:36:11,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:11,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:36:11,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:36:11,898 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) [2021-11-25 20:36:11,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:11,990 INFO L93 Difference]: Finished difference Result 59 states and 69 transitions. [2021-11-25 20:36:11,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:36:11,991 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-25 20:36:11,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:11,992 INFO L225 Difference]: With dead ends: 59 [2021-11-25 20:36:11,992 INFO L226 Difference]: Without dead ends: 59 [2021-11-25 20:36:11,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:36:11,994 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 [2021-11-25 20:36:11,995 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] [2021-11-25 20:36:11,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-25 20:36:12,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-11-25 20:36:12,001 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) [2021-11-25 20:36:12,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2021-11-25 20:36:12,002 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 3 [2021-11-25 20:36:12,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:12,003 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2021-11-25 20:36:12,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:12,003 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2021-11-25 20:36:12,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-25 20:36:12,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:12,004 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-25 20:36:12,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 20:36:12,004 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:12,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:12,005 INFO L85 PathProgramCache]: Analyzing trace with hash 212351948, now seen corresponding path program 1 times [2021-11-25 20:36:12,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:12,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144656124] [2021-11-25 20:36:12,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:12,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:12,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:12,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:36:12,250 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:12,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144656124] [2021-11-25 20:36:12,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144656124] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:12,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954093649] [2021-11-25 20:36:12,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:12,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:12,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:12,259 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:12,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:36:12,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:12,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 20:36:12,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:12,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:12,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:12,488 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 18 treesize of output 16 [2021-11-25 20:36:12,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:36:12,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:12,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:36:12,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [954093649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:12,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [367746489] [2021-11-25 20:36:12,771 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-25 20:36:12,771 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:12,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:12,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:12,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:12,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:12,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:12,952 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 11 treesize of output 7 [2021-11-25 20:36:13,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:13,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:13,159 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:13,453 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 [2021-11-25 20:36:13,454 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:13,454 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:13,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2021-11-25 20:36:13,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330592503] [2021-11-25 20:36:13,454 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:13,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 20:36:13,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:13,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 20:36:13,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-25 20:36:13,456 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) [2021-11-25 20:36:13,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:13,814 INFO L93 Difference]: Finished difference Result 113 states and 133 transitions. [2021-11-25 20:36:13,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:36:13,815 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 [2021-11-25 20:36:13,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:13,816 INFO L225 Difference]: With dead ends: 113 [2021-11-25 20:36:13,816 INFO L226 Difference]: Without dead ends: 113 [2021-11-25 20:36:13,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2021-11-25 20:36:13,818 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 383 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:13,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [383 Valid, 216 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:36:13,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-25 20:36:13,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 57. [2021-11-25 20:36:13,827 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) [2021-11-25 20:36:13,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-25 20:36:13,828 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 5 [2021-11-25 20:36:13,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:13,828 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-25 20:36:13,829 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) [2021-11-25 20:36:13,829 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-25 20:36:13,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:36:13,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:13,829 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 20:36:13,860 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 20:36:14,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:14,045 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:14,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:14,058 INFO L85 PathProgramCache]: Analyzing trace with hash -2006848815, now seen corresponding path program 1 times [2021-11-25 20:36:14,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:14,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097719078] [2021-11-25 20:36:14,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:14,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:14,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:14,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:14,144 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:14,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097719078] [2021-11-25 20:36:14,145 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097719078] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:14,145 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:14,145 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:36:14,145 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656576955] [2021-11-25 20:36:14,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:14,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:36:14,146 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:14,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:36:14,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:36:14,150 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) [2021-11-25 20:36:14,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:14,180 INFO L93 Difference]: Finished difference Result 61 states and 71 transitions. [2021-11-25 20:36:14,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:36:14,181 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 [2021-11-25 20:36:14,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:14,184 INFO L225 Difference]: With dead ends: 61 [2021-11-25 20:36:14,184 INFO L226 Difference]: Without dead ends: 61 [2021-11-25 20:36:14,184 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 [2021-11-25 20:36:14,185 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 [2021-11-25 20:36:14,186 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] [2021-11-25 20:36:14,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-25 20:36:14,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2021-11-25 20:36:14,190 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) [2021-11-25 20:36:14,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-25 20:36:14,191 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 6 [2021-11-25 20:36:14,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:14,192 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-25 20:36:14,192 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) [2021-11-25 20:36:14,192 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-25 20:36:14,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:36:14,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:14,193 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 20:36:14,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 20:36:14,193 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:14,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:14,193 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853599, now seen corresponding path program 1 times [2021-11-25 20:36:14,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:14,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030783370] [2021-11-25 20:36:14,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:14,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:14,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:14,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:14,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030783370] [2021-11-25 20:36:14,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030783370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:14,262 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:14,262 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-25 20:36:14,262 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088642987] [2021-11-25 20:36:14,262 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:14,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:36:14,263 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:14,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:36:14,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:36:14,264 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) [2021-11-25 20:36:14,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:14,299 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2021-11-25 20:36:14,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:36:14,300 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 [2021-11-25 20:36:14,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:14,300 INFO L225 Difference]: With dead ends: 56 [2021-11-25 20:36:14,300 INFO L226 Difference]: Without dead ends: 56 [2021-11-25 20:36:14,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:36:14,303 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 [2021-11-25 20:36:14,303 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] [2021-11-25 20:36:14,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-25 20:36:14,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-11-25 20:36:14,317 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) [2021-11-25 20:36:14,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-25 20:36:14,319 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 6 [2021-11-25 20:36:14,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:14,320 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-25 20:36:14,320 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) [2021-11-25 20:36:14,321 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-25 20:36:14,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 20:36:14,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:14,321 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 20:36:14,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 20:36:14,322 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:14,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:14,322 INFO L85 PathProgramCache]: Analyzing trace with hash -2006853598, now seen corresponding path program 1 times [2021-11-25 20:36:14,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:14,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951296995] [2021-11-25 20:36:14,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:14,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:14,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:14,413 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:14,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:14,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951296995] [2021-11-25 20:36:14,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951296995] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:14,414 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:14,414 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:36:14,414 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586088298] [2021-11-25 20:36:14,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:14,415 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:36:14,415 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:14,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:36:14,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:36:14,416 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) [2021-11-25 20:36:14,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:14,502 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-25 20:36:14,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:36:14,503 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 20:36:14,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:14,504 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:36:14,504 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 20:36:14,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:36:14,505 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 62 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 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 [2021-11-25 20:36:14,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 102 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:36:14,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 20:36:14,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-25 20:36:14,518 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) [2021-11-25 20:36:14,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-25 20:36:14,518 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 6 [2021-11-25 20:36:14,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:14,519 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-25 20:36:14,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:14,519 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-25 20:36:14,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:36:14,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:14,519 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:14,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 20:36:14,519 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:14,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:14,520 INFO L85 PathProgramCache]: Analyzing trace with hash -145844409, now seen corresponding path program 1 times [2021-11-25 20:36:14,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:14,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504253467] [2021-11-25 20:36:14,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:14,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:14,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:14,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:14,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:14,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504253467] [2021-11-25 20:36:14,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504253467] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:14,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218427496] [2021-11-25 20:36:14,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:14,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:14,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:14,626 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:14,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:36:14,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:14,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:36:14,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:14,805 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:14,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:14,876 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 [2021-11-25 20:36:14,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:14,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218427496] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:14,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [751405469] [2021-11-25 20:36:14,913 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 20:36:14,914 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:14,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:14,914 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:14,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:14,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:14,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:15,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:15,474 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:16,201 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '936#(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 [2021-11-25 20:36:16,201 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:16,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:16,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2021-11-25 20:36:16,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026095246] [2021-11-25 20:36:16,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:16,202 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:36:16,202 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:16,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:36:16,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:36:16,203 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2021-11-25 20:36:16,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:16,358 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-25 20:36:16,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:36:16,358 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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 8 [2021-11-25 20:36:16,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:16,359 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:36:16,359 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 20:36:16,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:36:16,360 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 303 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:16,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 102 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:36:16,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 20:36:16,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-11-25 20:36:16,364 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) [2021-11-25 20:36:16,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-11-25 20:36:16,365 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 8 [2021-11-25 20:36:16,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:16,365 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-11-25 20:36:16,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2021-11-25 20:36:16,365 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-11-25 20:36:16,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 20:36:16,366 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:16,366 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:16,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:16,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:36:16,591 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:16,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:16,591 INFO L85 PathProgramCache]: Analyzing trace with hash -145849192, now seen corresponding path program 1 times [2021-11-25 20:36:16,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:16,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563396254] [2021-11-25 20:36:16,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:16,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:16,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:16,683 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:16,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:16,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563396254] [2021-11-25 20:36:16,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563396254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:16,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888009027] [2021-11-25 20:36:16,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:16,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:16,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:16,699 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:16,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:36:16,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:16,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 20:36:16,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:16,810 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:36:16,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:36:16,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:16,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:17,078 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:17,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888009027] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:17,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461484397] [2021-11-25 20:36:17,083 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-25 20:36:17,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:17,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:17,084 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:17,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:17,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:17,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:17,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:17,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:17,262 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 14 treesize of output 10 [2021-11-25 20:36:17,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:17,403 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 [2021-11-25 20:36:17,439 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 14 treesize of output 10 [2021-11-25 20:36:17,461 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:18,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1117#(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 [2021-11-25 20:36:18,114 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:18,114 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:18,114 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2021-11-25 20:36:18,115 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221858322] [2021-11-25 20:36:18,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:18,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:36:18,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:18,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:36:18,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-25 20:36:18,116 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2021-11-25 20:36:18,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:18,287 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2021-11-25 20:36:18,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:36:18,287 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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 8 [2021-11-25 20:36:18,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:18,288 INFO L225 Difference]: With dead ends: 55 [2021-11-25 20:36:18,288 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 20:36:18,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:36:18,289 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 234 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:18,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 172 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:36:18,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 20:36:18,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-11-25 20:36:18,293 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) [2021-11-25 20:36:18,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-11-25 20:36:18,294 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 8 [2021-11-25 20:36:18,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:18,294 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-11-25 20:36:18,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 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) [2021-11-25 20:36:18,294 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-11-25 20:36:18,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:36:18,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:18,295 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:18,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:18,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:18,496 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:18,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:18,496 INFO L85 PathProgramCache]: Analyzing trace with hash -226209389, now seen corresponding path program 1 times [2021-11-25 20:36:18,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:18,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093286774] [2021-11-25 20:36:18,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:18,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:18,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:18,598 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:18,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:18,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093286774] [2021-11-25 20:36:18,598 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093286774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:18,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303583385] [2021-11-25 20:36:18,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:18,599 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:18,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:18,600 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:18,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:36:18,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:18,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:36:18,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:18,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:18,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:18,828 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 [2021-11-25 20:36:18,877 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:18,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303583385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:18,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735738752] [2021-11-25 20:36:18,882 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 20:36:18,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:18,883 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:18,883 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:18,883 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:18,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:18,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:18,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:19,012 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 14 treesize of output 10 [2021-11-25 20:36:19,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:19,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:19,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:19,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:19,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:19,325 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:20,225 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1300#(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 [2021-11-25 20:36:20,225 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:20,226 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:20,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 13 [2021-11-25 20:36:20,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337311388] [2021-11-25 20:36:20,226 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:20,227 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 20:36:20,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:20,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 20:36:20,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=356, Unknown=0, NotChecked=0, Total=462 [2021-11-25 20:36:20,228 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) [2021-11-25 20:36:20,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:20,439 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2021-11-25 20:36:20,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:36:20,440 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 [2021-11-25 20:36:20,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:20,440 INFO L225 Difference]: With dead ends: 54 [2021-11-25 20:36:20,440 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 20:36:20,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=161, Invalid=489, Unknown=0, NotChecked=0, Total=650 [2021-11-25 20:36:20,442 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 405 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:20,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [405 Valid, 136 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:36:20,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 20:36:20,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-11-25 20:36:20,445 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) [2021-11-25 20:36:20,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2021-11-25 20:36:20,446 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 9 [2021-11-25 20:36:20,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:20,446 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2021-11-25 20:36:20,446 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) [2021-11-25 20:36:20,447 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2021-11-25 20:36:20,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:36:20,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:20,447 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:20,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:20,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:20,667 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:20,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:20,667 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447746, now seen corresponding path program 1 times [2021-11-25 20:36:20,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:20,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020018214] [2021-11-25 20:36:20,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:20,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:20,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:20,697 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:20,697 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:20,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020018214] [2021-11-25 20:36:20,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020018214] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:20,698 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:20,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:36:20,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081134402] [2021-11-25 20:36:20,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:20,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:36:20,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:20,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:36:20,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:36:20,700 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) [2021-11-25 20:36:20,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:20,756 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2021-11-25 20:36:20,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:36:20,756 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 [2021-11-25 20:36:20,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:20,757 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:36:20,757 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 20:36:20,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:36:20,759 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 [2021-11-25 20:36:20,759 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] [2021-11-25 20:36:20,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 20:36:20,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-25 20:36:20,762 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) [2021-11-25 20:36:20,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2021-11-25 20:36:20,763 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 10 [2021-11-25 20:36:20,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:20,763 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2021-11-25 20:36:20,763 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) [2021-11-25 20:36:20,764 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2021-11-25 20:36:20,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:36:20,764 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:20,764 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:20,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 20:36:20,765 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:20,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:20,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1577447747, now seen corresponding path program 1 times [2021-11-25 20:36:20,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:20,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105286691] [2021-11-25 20:36:20,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:20,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:20,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:20,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:20,886 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:20,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105286691] [2021-11-25 20:36:20,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105286691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:20,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609061905] [2021-11-25 20:36:20,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:20,887 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:20,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:20,888 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:20,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:36:20,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:20,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 20:36:20,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:21,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:21,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:21,036 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 [2021-11-25 20:36:21,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:21,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609061905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:21,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [432852909] [2021-11-25 20:36:21,059 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:36:21,059 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:21,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:21,060 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:21,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:21,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:21,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:21,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:21,196 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 14 treesize of output 10 [2021-11-25 20:36:21,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:21,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:21,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:21,375 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 [2021-11-25 20:36:21,438 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 14 treesize of output 10 [2021-11-25 20:36:21,535 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:21,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:21,567 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:22,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [432852909] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:22,448 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:22,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 4, 4] total 15 [2021-11-25 20:36:22,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237078532] [2021-11-25 20:36:22,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:22,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:36:22,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:22,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:36:22,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-25 20:36:22,456 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) [2021-11-25 20:36:22,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:22,615 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2021-11-25 20:36:22,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 20:36:22,615 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 [2021-11-25 20:36:22,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:22,616 INFO L225 Difference]: With dead ends: 51 [2021-11-25 20:36:22,616 INFO L226 Difference]: Without dead ends: 51 [2021-11-25 20:36:22,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2021-11-25 20:36:22,617 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 55 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:22,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 88 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:36:22,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-25 20:36:22,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-25 20:36:22,620 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) [2021-11-25 20:36:22,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-25 20:36:22,621 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 10 [2021-11-25 20:36:22,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:22,621 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-25 20:36:22,621 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) [2021-11-25 20:36:22,621 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-25 20:36:22,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 20:36:22,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:22,622 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:22,665 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 20:36:22,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:22,842 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:22,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:22,843 INFO L85 PathProgramCache]: Analyzing trace with hash -196055170, now seen corresponding path program 1 times [2021-11-25 20:36:22,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:22,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748922830] [2021-11-25 20:36:22,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:22,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:22,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:22,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:22,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:22,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748922830] [2021-11-25 20:36:22,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748922830] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:22,880 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:22,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:36:22,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801792920] [2021-11-25 20:36:22,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:22,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:36:22,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:22,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:36:22,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:36:22,883 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) [2021-11-25 20:36:22,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:22,933 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2021-11-25 20:36:22,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:36:22,934 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 [2021-11-25 20:36:22,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:22,934 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:36:22,935 INFO L226 Difference]: Without dead ends: 52 [2021-11-25 20:36:22,935 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 [2021-11-25 20:36:22,936 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, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:22,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 37 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:36:22,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-25 20:36:22,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-11-25 20:36:22,944 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) [2021-11-25 20:36:22,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-11-25 20:36:22,945 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 12 [2021-11-25 20:36:22,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:22,945 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-11-25 20:36:22,945 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) [2021-11-25 20:36:22,945 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-11-25 20:36:22,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 20:36:22,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:22,946 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:22,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 20:36:22,946 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:22,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:22,947 INFO L85 PathProgramCache]: Analyzing trace with hash -196055169, now seen corresponding path program 1 times [2021-11-25 20:36:22,947 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:22,947 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369508679] [2021-11-25 20:36:22,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:22,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:22,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:23,194 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:23,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:23,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369508679] [2021-11-25 20:36:23,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369508679] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:23,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087901797] [2021-11-25 20:36:23,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:23,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:23,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:23,199 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:23,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:36:23,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:23,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:36:23,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:23,375 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 [2021-11-25 20:36:23,431 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:36:23,434 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:23,434 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 18 treesize of output 10 [2021-11-25 20:36:23,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:23,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:23,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 20:36:23,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 20:36:23,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:23,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087901797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:23,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179022885] [2021-11-25 20:36:23,656 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 20:36:23,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:23,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:23,656 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:23,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:23,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:23,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:23,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:23,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:23,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:23,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:23,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:23,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:24,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:24,055 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 [2021-11-25 20:36:24,145 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:24,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:24,292 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:25,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [179022885] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:25,763 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:25,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8, 8, 8] total 28 [2021-11-25 20:36:25,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400649320] [2021-11-25 20:36:25,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:25,767 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 20:36:25,767 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:25,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 20:36:25,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=691, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:36:25,771 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) [2021-11-25 20:36:25,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:25,994 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2021-11-25 20:36:25,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:36:25,995 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 [2021-11-25 20:36:25,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:25,995 INFO L225 Difference]: With dead ends: 55 [2021-11-25 20:36:25,996 INFO L226 Difference]: Without dead ends: 55 [2021-11-25 20:36:25,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=121, Invalid=691, Unknown=0, NotChecked=0, Total=812 [2021-11-25 20:36:25,997 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 158 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:25,997 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 111 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:36:25,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-25 20:36:25,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2021-11-25 20:36:25,999 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) [2021-11-25 20:36:26,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2021-11-25 20:36:26,000 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 12 [2021-11-25 20:36:26,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:26,000 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2021-11-25 20:36:26,000 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) [2021-11-25 20:36:26,000 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2021-11-25 20:36:26,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:36:26,001 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:26,001 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:26,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:26,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:26,227 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:26,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:26,227 INFO L85 PathProgramCache]: Analyzing trace with hash 569547529, now seen corresponding path program 1 times [2021-11-25 20:36:26,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:26,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341315876] [2021-11-25 20:36:26,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:26,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:26,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:26,296 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:26,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:26,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341315876] [2021-11-25 20:36:26,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341315876] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:26,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045680307] [2021-11-25 20:36:26,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:26,297 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:26,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:26,311 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:26,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:36:26,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:26,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:36:26,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:26,408 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:36:26,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:36:26,529 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:26,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:26,634 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:26,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045680307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:26,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [267586873] [2021-11-25 20:36:26,637 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 20:36:26,637 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:26,637 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:26,637 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:26,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:26,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:26,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:26,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:26,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:26,789 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 [2021-11-25 20:36:26,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:26,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:26,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:26,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:27,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:27,146 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:27,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:27,467 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:29,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2115#(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 [2021-11-25 20:36:29,321 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:29,321 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:29,321 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-25 20:36:29,321 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738423978] [2021-11-25 20:36:29,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:29,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:36:29,322 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:29,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:36:29,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2021-11-25 20:36:29,323 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:29,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:29,504 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-25 20:36:29,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:36:29,505 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-25 20:36:29,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:29,505 INFO L225 Difference]: With dead ends: 63 [2021-11-25 20:36:29,505 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 20:36:29,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=197, Invalid=993, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 20:36:29,506 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 104 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:29,506 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 255 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:36:29,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 20:36:29,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 57. [2021-11-25 20:36:29,508 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) [2021-11-25 20:36:29,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2021-11-25 20:36:29,509 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 14 [2021-11-25 20:36:29,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:29,510 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2021-11-25 20:36:29,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:29,510 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2021-11-25 20:36:29,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-25 20:36:29,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:29,511 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:29,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:29,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 20:36:29,723 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)] === [2021-11-25 20:36:29,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:29,723 INFO L85 PathProgramCache]: Analyzing trace with hash 572774269, now seen corresponding path program 1 times [2021-11-25 20:36:29,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:29,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676767652] [2021-11-25 20:36:29,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:29,723 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:29,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:29,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:36:29,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:29,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676767652] [2021-11-25 20:36:29,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676767652] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:29,799 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:29,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:36:29,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351934324] [2021-11-25 20:36:29,800 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:29,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:36:29,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:29,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:36:29,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:36:29,800 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) [2021-11-25 20:36:29,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:29,838 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2021-11-25 20:36:29,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:36:29,838 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 [2021-11-25 20:36:29,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:29,839 INFO L225 Difference]: With dead ends: 56 [2021-11-25 20:36:29,839 INFO L226 Difference]: Without dead ends: 48 [2021-11-25 20:36:29,839 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 [2021-11-25 20:36:29,840 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 [2021-11-25 20:36:29,840 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] [2021-11-25 20:36:29,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-25 20:36:29,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-11-25 20:36:29,841 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) [2021-11-25 20:36:29,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2021-11-25 20:36:29,842 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 14 [2021-11-25 20:36:29,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:29,842 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2021-11-25 20:36:29,842 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) [2021-11-25 20:36:29,842 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2021-11-25 20:36:29,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-25 20:36:29,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:29,843 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:29,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 20:36:29,843 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:29,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:29,843 INFO L85 PathProgramCache]: Analyzing trace with hash 922644863, now seen corresponding path program 2 times [2021-11-25 20:36:29,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:29,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969708857] [2021-11-25 20:36:29,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:29,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:29,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:30,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:30,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:30,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969708857] [2021-11-25 20:36:30,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969708857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:30,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086798072] [2021-11-25 20:36:30,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:36:30,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:30,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:30,150 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:30,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:36:30,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:36:30,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:30,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 20:36:30,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:30,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-25 20:36:30,416 INFO L354 Elim1Store]: treesize reduction 6, result has 71.4 percent of original size [2021-11-25 20:36:30,416 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 2 case distinctions, treesize of input 25 treesize of output 25 [2021-11-25 20:36:30,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:36:30,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:30,689 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 29 treesize of output 25 [2021-11-25 20:36:30,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-25 20:36:30,699 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:36:30,699 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 45 treesize of output 39 [2021-11-25 20:36:30,773 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:36:30,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086798072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:30,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967639353] [2021-11-25 20:36:30,776 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 20:36:30,776 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:30,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:30,776 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:30,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:30,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:30,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:30,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:30,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:30,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:30,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:31,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:31,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:31,131 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 14 treesize of output 10 [2021-11-25 20:36:31,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:31,255 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:31,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:31,540 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:33,712 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2477#(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 [2021-11-25 20:36:33,712 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:33,712 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:33,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6, 6] total 23 [2021-11-25 20:36:33,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851851317] [2021-11-25 20:36:33,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:33,712 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 20:36:33,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:33,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 20:36:33,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:36:33,714 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) [2021-11-25 20:36:34,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:34,406 INFO L93 Difference]: Finished difference Result 122 states and 143 transitions. [2021-11-25 20:36:34,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 20:36:34,407 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 [2021-11-25 20:36:34,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:34,408 INFO L225 Difference]: With dead ends: 122 [2021-11-25 20:36:34,408 INFO L226 Difference]: Without dead ends: 122 [2021-11-25 20:36:34,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=239, Invalid=1653, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:36:34,409 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 96 mSDsluCounter, 723 mSDsCounter, 0 mSdLazyCounter, 586 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 725 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:34,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 725 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 586 Invalid, 0 Unknown, 99 Unchecked, 0.4s Time] [2021-11-25 20:36:34,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-25 20:36:34,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 58. [2021-11-25 20:36:34,411 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) [2021-11-25 20:36:34,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-25 20:36:34,412 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 16 [2021-11-25 20:36:34,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:34,412 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-25 20:36:34,412 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) [2021-11-25 20:36:34,412 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-25 20:36:34,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:36:34,413 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:34,413 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:34,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:34,622 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 20:36:34,623 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:34,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:34,623 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515559, now seen corresponding path program 1 times [2021-11-25 20:36:34,623 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:34,623 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158793997] [2021-11-25 20:36:34,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:34,623 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:34,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:34,664 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:34,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:34,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158793997] [2021-11-25 20:36:34,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158793997] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:36:34,665 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:36:34,665 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:36:34,666 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455470583] [2021-11-25 20:36:34,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:34,666 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:36:34,666 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:34,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:36:34,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:36:34,667 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) [2021-11-25 20:36:34,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:34,712 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-25 20:36:34,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:36:34,712 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 [2021-11-25 20:36:34,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:34,713 INFO L225 Difference]: With dead ends: 57 [2021-11-25 20:36:34,713 INFO L226 Difference]: Without dead ends: 57 [2021-11-25 20:36:34,713 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 [2021-11-25 20:36:34,714 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 [2021-11-25 20:36:34,714 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] [2021-11-25 20:36:34,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-25 20:36:34,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-11-25 20:36:34,716 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) [2021-11-25 20:36:34,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-25 20:36:34,717 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 19 [2021-11-25 20:36:34,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:34,717 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-25 20:36:34,717 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) [2021-11-25 20:36:34,717 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-25 20:36:34,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:36:34,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:34,718 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:34,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-25 20:36:34,719 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:34,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:34,719 INFO L85 PathProgramCache]: Analyzing trace with hash -1378515558, now seen corresponding path program 1 times [2021-11-25 20:36:34,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:34,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587226159] [2021-11-25 20:36:34,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:34,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:34,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:34,812 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:34,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:34,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587226159] [2021-11-25 20:36:34,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [587226159] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:34,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685062334] [2021-11-25 20:36:34,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:34,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:34,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:34,814 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:34,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:36:34,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:34,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-25 20:36:34,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:34,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:34,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:34,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:36:35,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:35,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:35,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:35,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685062334] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:35,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:36:35,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 9 [2021-11-25 20:36:35,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603333096] [2021-11-25 20:36:35,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:36:35,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:36:35,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:35,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:36:35,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:36:35,129 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 6 states, 5 states have (on average 3.4) 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) [2021-11-25 20:36:35,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:35,214 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2021-11-25 20:36:35,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:36:35,215 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.4) 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 [2021-11-25 20:36:35,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:35,216 INFO L225 Difference]: With dead ends: 60 [2021-11-25 20:36:35,216 INFO L226 Difference]: Without dead ends: 60 [2021-11-25 20:36:35,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:36:35,216 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 98 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:35,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 68 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:36:35,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-25 20:36:35,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-11-25 20:36:35,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:35,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2021-11-25 20:36:35,219 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 19 [2021-11-25 20:36:35,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:35,219 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2021-11-25 20:36:35,219 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.4) 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) [2021-11-25 20:36:35,220 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2021-11-25 20:36:35,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-25 20:36:35,220 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:35,220 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:35,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:35,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 20:36:35,421 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:35,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:35,421 INFO L85 PathProgramCache]: Analyzing trace with hash -690501505, now seen corresponding path program 3 times [2021-11-25 20:36:35,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:35,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914732815] [2021-11-25 20:36:35,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:35,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:35,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:35,610 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:35,610 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:35,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914732815] [2021-11-25 20:36:35,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914732815] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:35,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677067167] [2021-11-25 20:36:35,611 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:36:35,611 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:35,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:35,622 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:35,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:36:35,706 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:36:35,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:35,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-25 20:36:35,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:35,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:35,863 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 [2021-11-25 20:36:35,867 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:35,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:35,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-25 20:36:35,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-25 20:36:35,988 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:35,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677067167] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:35,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355703835] [2021-11-25 20:36:35,991 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 20:36:35,991 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:35,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:35,991 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:35,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:36,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:36,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:36,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:36,094 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 14 treesize of output 10 [2021-11-25 20:36:36,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:36,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:36,230 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 14 treesize of output 10 [2021-11-25 20:36:36,273 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 14 treesize of output 10 [2021-11-25 20:36:36,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:36,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:36,419 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:36,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:36,781 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:39,044 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3189#(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 [2021-11-25 20:36:39,044 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:39,045 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:39,045 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2021-11-25 20:36:39,045 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125594446] [2021-11-25 20:36:39,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:39,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:36:39,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:39,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:36:39,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=877, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:36:39,046 INFO L87 Difference]: Start difference. First operand 60 states and 70 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) [2021-11-25 20:36:39,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:39,737 INFO L93 Difference]: Finished difference Result 170 states and 197 transitions. [2021-11-25 20:36:39,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:36:39,738 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 [2021-11-25 20:36:39,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:39,739 INFO L225 Difference]: With dead ends: 170 [2021-11-25 20:36:39,739 INFO L226 Difference]: Without dead ends: 170 [2021-11-25 20:36:39,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=257, Invalid=1723, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:36:39,740 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 902 mSDsluCounter, 1126 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 902 SdHoareTripleChecker+Valid, 1092 SdHoareTripleChecker+Invalid, 655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:39,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [902 Valid, 1092 Invalid, 655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:36:39,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-25 20:36:39,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 68. [2021-11-25 20:36:39,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 56 states have (on average 1.4285714285714286) internal successors, (80), 67 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:39,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 80 transitions. [2021-11-25 20:36:39,744 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 80 transitions. Word has length 20 [2021-11-25 20:36:39,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:39,744 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 80 transitions. [2021-11-25 20:36:39,744 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) [2021-11-25 20:36:39,744 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 80 transitions. [2021-11-25 20:36:39,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-25 20:36:39,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:39,745 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:39,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:39,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:39,965 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:39,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:39,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1890947467, now seen corresponding path program 4 times [2021-11-25 20:36:39,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:39,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [87255014] [2021-11-25 20:36:39,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:39,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:39,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:40,140 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:40,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:40,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [87255014] [2021-11-25 20:36:40,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [87255014] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:40,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909272591] [2021-11-25 20:36:40,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:36:40,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:40,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:40,147 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:40,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 20:36:40,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:40,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-25 20:36:40,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:40,374 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:40,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:40,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:36:40,569 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:40,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909272591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:40,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418872921] [2021-11-25 20:36:40,571 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 20:36:40,571 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:40,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:40,572 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:40,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:40,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:40,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:40,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:40,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:40,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:40,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:40,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:40,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:40,902 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 14 treesize of output 10 [2021-11-25 20:36:40,986 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:40,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:41,260 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:43,274 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3613#(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 [2021-11-25 20:36:43,274 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:43,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:43,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 23 [2021-11-25 20:36:43,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350711198] [2021-11-25 20:36:43,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:43,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 20:36:43,275 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:43,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 20:36:43,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=992, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 20:36:43,276 INFO L87 Difference]: Start difference. First operand 68 states and 80 transitions. Second operand has 24 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:44,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:44,135 INFO L93 Difference]: Finished difference Result 238 states and 277 transitions. [2021-11-25 20:36:44,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:36:44,136 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-25 20:36:44,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:44,137 INFO L225 Difference]: With dead ends: 238 [2021-11-25 20:36:44,137 INFO L226 Difference]: Without dead ends: 238 [2021-11-25 20:36:44,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=362, Invalid=1800, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:36:44,139 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 899 mSDsluCounter, 904 mSDsCounter, 0 mSdLazyCounter, 1034 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 899 SdHoareTripleChecker+Valid, 966 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1034 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:44,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [899 Valid, 966 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1034 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:36:44,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-11-25 20:36:44,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 70. [2021-11-25 20:36:44,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 58 states have (on average 1.4310344827586208) internal successors, (83), 69 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) [2021-11-25 20:36:44,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2021-11-25 20:36:44,147 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 22 [2021-11-25 20:36:44,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:44,147 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2021-11-25 20:36:44,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 24 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:44,148 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2021-11-25 20:36:44,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-25 20:36:44,150 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:44,151 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] [2021-11-25 20:36:44,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:44,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:44,358 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:44,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:44,359 INFO L85 PathProgramCache]: Analyzing trace with hash 460224418, now seen corresponding path program 1 times [2021-11-25 20:36:44,359 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:44,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373725269] [2021-11-25 20:36:44,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:44,359 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:44,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:44,604 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:44,604 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:44,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373725269] [2021-11-25 20:36:44,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373725269] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:44,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406093727] [2021-11-25 20:36:44,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:44,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:44,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:44,614 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:44,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 20:36:44,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:44,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 20:36:44,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:44,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:36:44,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:44,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:36:44,982 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 20:36:44,983 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 18 treesize of output 10 [2021-11-25 20:36:44,988 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:44,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:45,047 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_419 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_419) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) |c_ULTIMATE.start_main_~nondetString1~0#1.offset|) 0)) is different from false [2021-11-25 20:36:45,053 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:45,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-25 20:36:45,059 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:45,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-11-25 20:36:45,062 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 9 treesize of output 7 [2021-11-25 20:36:45,209 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:45,210 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406093727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:45,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767501493] [2021-11-25 20:36:45,212 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:36:45,212 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:45,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:45,212 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:45,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:45,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:45,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:45,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:45,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:45,357 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 11 treesize of output 7 [2021-11-25 20:36:45,424 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:36:45,424 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 79 treesize of output 78 [2021-11-25 20:36:45,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:45,536 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 14 treesize of output 10 [2021-11-25 20:36:45,584 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:45,584 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 [2021-11-25 20:36:46,044 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:49,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4111#(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 [2021-11-25 20:36:49,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:49,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:49,697 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 21 [2021-11-25 20:36:49,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947651432] [2021-11-25 20:36:49,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:49,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:36:49,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:49,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:36:49,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1251, Unknown=1, NotChecked=72, Total=1482 [2021-11-25 20:36:49,699 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:50,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:50,020 INFO L93 Difference]: Finished difference Result 111 states and 131 transitions. [2021-11-25 20:36:50,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:36:50,020 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 0 states have call successors, (0), 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 [2021-11-25 20:36:50,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:50,022 INFO L225 Difference]: With dead ends: 111 [2021-11-25 20:36:50,022 INFO L226 Difference]: Without dead ends: 94 [2021-11-25 20:36:50,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 2 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=201, Invalid=1608, Unknown=1, NotChecked=82, Total=1892 [2021-11-25 20:36:50,024 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 32 mSDsluCounter, 361 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:50,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 332 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 233 Invalid, 0 Unknown, 60 Unchecked, 0.2s Time] [2021-11-25 20:36:50,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-25 20:36:50,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2021-11-25 20:36:50,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 80 states have (on average 1.35) internal successors, (108), 91 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:50,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 108 transitions. [2021-11-25 20:36:50,029 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 108 transitions. Word has length 23 [2021-11-25 20:36:50,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:50,029 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 108 transitions. [2021-11-25 20:36:50,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:36:50,029 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 108 transitions. [2021-11-25 20:36:50,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 20:36:50,030 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:50,030 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:36:50,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:50,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 20:36:50,247 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:50,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:50,247 INFO L85 PathProgramCache]: Analyzing trace with hash -429345665, now seen corresponding path program 5 times [2021-11-25 20:36:50,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:50,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513672596] [2021-11-25 20:36:50,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:50,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:50,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:50,484 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 3 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 20:36:50,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:50,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513672596] [2021-11-25 20:36:50,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513672596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:50,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599509561] [2021-11-25 20:36:50,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:36:50,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:50,484 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:50,489 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:50,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 20:36:50,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:36:50,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:50,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 20:36:50,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:50,587 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:36:50,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:36:50,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:50,924 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:50,925 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 18 treesize of output 18 [2021-11-25 20:36:50,999 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:36:50,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:51,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2021-11-25 20:36:51,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2021-11-25 20:36:51,308 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:36:51,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599509561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:51,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [837735989] [2021-11-25 20:36:51,310 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-25 20:36:51,310 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:51,310 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:51,311 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:51,311 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:51,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:51,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:51,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:51,440 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 [2021-11-25 20:36:51,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:51,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:51,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:51,607 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 14 treesize of output 10 [2021-11-25 20:36:51,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:51,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:51,767 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:51,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:36:52,039 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:36:54,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4507#(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 [2021-11-25 20:36:54,110 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:36:54,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:36:54,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5, 5] total 25 [2021-11-25 20:36:54,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153913950] [2021-11-25 20:36:54,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:36:54,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:36:54,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:36:54,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:36:54,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1141, Unknown=0, NotChecked=0, Total=1260 [2021-11-25 20:36:54,112 INFO L87 Difference]: Start difference. First operand 92 states and 108 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) [2021-11-25 20:36:54,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:36:54,832 INFO L93 Difference]: Finished difference Result 116 states and 134 transitions. [2021-11-25 20:36:54,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 20:36:54,832 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 [2021-11-25 20:36:54,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:36:54,833 INFO L225 Difference]: With dead ends: 116 [2021-11-25 20:36:54,833 INFO L226 Difference]: Without dead ends: 84 [2021-11-25 20:36:54,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=322, Invalid=3218, Unknown=0, NotChecked=0, Total=3540 [2021-11-25 20:36:54,839 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 23 mSDsluCounter, 502 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 82 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:36:54,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 469 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 409 Invalid, 0 Unknown, 82 Unchecked, 0.2s Time] [2021-11-25 20:36:54,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-25 20:36:54,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 74. [2021-11-25 20:36:54,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 63 states have (on average 1.380952380952381) internal successors, (87), 73 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) [2021-11-25 20:36:54,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 87 transitions. [2021-11-25 20:36:54,847 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 87 transitions. Word has length 24 [2021-11-25 20:36:54,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:36:54,848 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 87 transitions. [2021-11-25 20:36:54,848 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) [2021-11-25 20:36:54,848 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 87 transitions. [2021-11-25 20:36:54,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 20:36:54,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:36:54,850 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] [2021-11-25 20:36:54,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 20:36:55,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:55,074 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:36:55,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:36:55,075 INFO L85 PathProgramCache]: Analyzing trace with hash -761001242, now seen corresponding path program 2 times [2021-11-25 20:36:55,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:36:55,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872080591] [2021-11-25 20:36:55,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:36:55,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:36:55,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:36:55,160 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:36:55,161 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:36:55,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872080591] [2021-11-25 20:36:55,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872080591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:36:55,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985943746] [2021-11-25 20:36:55,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:36:55,161 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:36:55,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:36:55,162 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:36:55,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 20:36:55,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:36:55,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:36:55,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-25 20:36:55,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:36:55,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:55,403 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:36:55,403 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 17 treesize of output 23 [2021-11-25 20:36:55,414 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 8 treesize of output 3 [2021-11-25 20:36:56,017 INFO L354 Elim1Store]: treesize reduction 16, result has 51.5 percent of original size [2021-11-25 20:36:56,018 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 28 treesize of output 30 [2021-11-25 20:36:56,186 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:36:56,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:36:56,560 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:56,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 34 [2021-11-25 20:36:56,569 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:56,569 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 58 treesize of output 54 [2021-11-25 20:36:56,578 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:36:56,579 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 31 treesize of output 31 [2021-11-25 20:36:56,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-25 20:36:56,781 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 20:36:56,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985943746] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:36:56,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866739110] [2021-11-25 20:36:56,783 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:36:56,783 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:36:56,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:36:56,784 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:36:56,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:36:56,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:36:56,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:36:56,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:56,894 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 [2021-11-25 20:36:56,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:36:56,978 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:36:56,978 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 79 treesize of output 78 [2021-11-25 20:36:57,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:36:57,082 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 [2021-11-25 20:36:57,133 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:36:57,133 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 [2021-11-25 20:36:57,613 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:03,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4926#(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 [2021-11-25 20:37:03,543 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:03,543 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:03,543 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 25 [2021-11-25 20:37:03,543 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884043621] [2021-11-25 20:37:03,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:03,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:37:03,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:03,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:37:03,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1598, Unknown=2, NotChecked=0, Total=1892 [2021-11-25 20:37:03,551 INFO L87 Difference]: Start difference. First operand 74 states and 87 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) [2021-11-25 20:37:03,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:03,928 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2021-11-25 20:37:03,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 20:37:03,928 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 [2021-11-25 20:37:03,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:03,929 INFO L225 Difference]: With dead ends: 115 [2021-11-25 20:37:03,929 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 20:37:03,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 629 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=377, Invalid=2273, Unknown=2, NotChecked=0, Total=2652 [2021-11-25 20:37:03,931 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 107 mSDsluCounter, 392 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:03,932 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 387 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 350 Invalid, 0 Unknown, 88 Unchecked, 0.2s Time] [2021-11-25 20:37:03,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 20:37:03,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 99. [2021-11-25 20:37:03,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 88 states have (on average 1.4659090909090908) internal successors, (129), 98 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:03,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 129 transitions. [2021-11-25 20:37:03,935 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 129 transitions. Word has length 25 [2021-11-25 20:37:03,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:03,936 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 129 transitions. [2021-11-25 20:37:03,936 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) [2021-11-25 20:37:03,936 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 129 transitions. [2021-11-25 20:37:03,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:37:03,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:03,937 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] [2021-11-25 20:37:03,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:04,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 20:37:04,157 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr14REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:04,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:04,157 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242575, now seen corresponding path program 1 times [2021-11-25 20:37:04,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:04,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250127525] [2021-11-25 20:37:04,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:04,157 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:04,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 20:37:04,208 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:04,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250127525] [2021-11-25 20:37:04,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250127525] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:04,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:04,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:37:04,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904681845] [2021-11-25 20:37:04,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:04,209 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:37:04,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:04,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:37:04,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:37:04,210 INFO L87 Difference]: Start difference. First operand 99 states and 129 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) [2021-11-25 20:37:04,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:04,260 INFO L93 Difference]: Finished difference Result 106 states and 135 transitions. [2021-11-25 20:37:04,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:37:04,260 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 [2021-11-25 20:37:04,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:04,261 INFO L225 Difference]: With dead ends: 106 [2021-11-25 20:37:04,261 INFO L226 Difference]: Without dead ends: 106 [2021-11-25 20:37:04,261 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 [2021-11-25 20:37:04,262 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 [2021-11-25 20:37:04,263 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] [2021-11-25 20:37:04,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-25 20:37:04,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 97. [2021-11-25 20:37:04,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 88 states have (on average 1.4204545454545454) internal successors, (125), 96 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) [2021-11-25 20:37:04,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 125 transitions. [2021-11-25 20:37:04,266 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 125 transitions. Word has length 26 [2021-11-25 20:37:04,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:04,267 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 125 transitions. [2021-11-25 20:37:04,268 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) [2021-11-25 20:37:04,268 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 125 transitions. [2021-11-25 20:37:04,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-25 20:37:04,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:04,268 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] [2021-11-25 20:37:04,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-25 20:37:04,269 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:04,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:04,269 INFO L85 PathProgramCache]: Analyzing trace with hash -2116242574, now seen corresponding path program 1 times [2021-11-25 20:37:04,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:04,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879603763] [2021-11-25 20:37:04,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:04,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:04,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:04,382 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:04,382 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:04,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879603763] [2021-11-25 20:37:04,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879603763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:04,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63536203] [2021-11-25 20:37:04,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:04,383 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:04,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:04,387 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:04,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 20:37:04,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:04,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-25 20:37:04,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:04,587 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:04,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:04,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:37:04,770 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:04,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63536203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:04,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [877066443] [2021-11-25 20:37:04,772 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 20:37:04,776 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:04,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:04,776 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:04,776 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:04,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:04,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:04,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:37:04,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:04,902 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 14 treesize of output 10 [2021-11-25 20:37:04,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:04,954 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 83 treesize of output 75 [2021-11-25 20:37:04,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:05,007 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 14 treesize of output 10 [2021-11-25 20:37:05,059 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:05,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:05,259 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:09,067 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [877066443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:09,067 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:09,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [7, 7, 7] total 32 [2021-11-25 20:37:09,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650082790] [2021-11-25 20:37:09,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:09,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 20:37:09,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:09,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 20:37:09,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=860, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:37:09,069 INFO L87 Difference]: Start difference. First operand 97 states and 125 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:09,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:09,390 INFO L93 Difference]: Finished difference Result 91 states and 107 transitions. [2021-11-25 20:37:09,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:37:09,391 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 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 [2021-11-25 20:37:09,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:09,392 INFO L225 Difference]: With dead ends: 91 [2021-11-25 20:37:09,392 INFO L226 Difference]: Without dead ends: 91 [2021-11-25 20:37:09,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=196, Invalid=860, Unknown=0, NotChecked=0, Total=1056 [2021-11-25 20:37:09,393 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 116 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:09,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 101 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:37:09,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-25 20:37:09,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2021-11-25 20:37:09,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 79 states have (on average 1.3164556962025316) internal successors, (104), 87 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:09,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 104 transitions. [2021-11-25 20:37:09,395 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 104 transitions. Word has length 26 [2021-11-25 20:37:09,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:09,396 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 104 transitions. [2021-11-25 20:37:09,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:09,396 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 104 transitions. [2021-11-25 20:37:09,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 20:37:09,397 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:09,397 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] [2021-11-25 20:37:09,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:09,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-25 20:37:09,603 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:09,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:09,603 INFO L85 PathProgramCache]: Analyzing trace with hash 2141288174, now seen corresponding path program 3 times [2021-11-25 20:37:09,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:09,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942672596] [2021-11-25 20:37:09,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:09,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:09,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:10,201 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:37:10,201 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:10,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942672596] [2021-11-25 20:37:10,202 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942672596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:10,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669465498] [2021-11-25 20:37:10,202 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:37:10,202 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:10,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:10,207 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:10,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 20:37:10,319 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:37:10,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:10,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 20:37:10,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:10,550 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 [2021-11-25 20:37:10,624 INFO L354 Elim1Store]: treesize reduction 28, result has 41.7 percent of original size [2021-11-25 20:37:10,626 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 24 treesize of output 33 [2021-11-25 20:37:11,106 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 [2021-11-25 20:37:11,111 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:11,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:13,321 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (v_ArrVal_586 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|) v_ArrVal_586))) (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 [2021-11-25 20:37:13,348 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-25 20:37:13,349 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 116 treesize of output 125 [2021-11-25 20:37:13,360 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:37:13,360 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 43 treesize of output 45 [2021-11-25 20:37:13,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 20:37:13,518 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:37:13,518 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 52 treesize of output 77 [2021-11-25 20:37:13,777 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:13,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669465498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:13,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [936796065] [2021-11-25 20:37:13,779 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:37:13,779 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:13,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:13,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:13,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:13,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:13,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:13,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:37:13,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:13,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:13,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:13,985 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 83 treesize of output 75 [2021-11-25 20:37:14,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:14,049 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 14 treesize of output 10 [2021-11-25 20:37:14,077 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:14,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:14,873 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:20,303 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5957#(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 [2021-11-25 20:37:20,304 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:20,304 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:20,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 38 [2021-11-25 20:37:20,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420741745] [2021-11-25 20:37:20,304 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:20,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 20:37:20,304 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:20,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 20:37:20,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=2761, Unknown=1, NotChecked=106, Total=3080 [2021-11-25 20:37:20,306 INFO L87 Difference]: Start difference. First operand 88 states and 104 transitions. Second operand has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 38 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) [2021-11-25 20:37:22,725 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (.cse2 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|))) (and (or (= (select (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString1~0#1.base|) 1) 0) .cse0) (or .cse0 (= 2 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|))) (< 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) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (v_ArrVal_586 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|) v_ArrVal_586))) (or (= (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| 1)) 0) (not (= (select .cse1 (+ |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) (< 1 .cse2) (<= .cse2 2))) is different from false [2021-11-25 20:37:24,875 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) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (v_ArrVal_586 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|) v_ArrVal_586))) (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)) is different from false [2021-11-25 20:37:25,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:25,128 INFO L93 Difference]: Finished difference Result 140 states and 164 transitions. [2021-11-25 20:37:25,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:37:25,128 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 38 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) Word has length 29 [2021-11-25 20:37:25,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:25,129 INFO L225 Difference]: With dead ends: 140 [2021-11-25 20:37:25,129 INFO L226 Difference]: Without dead ends: 120 [2021-11-25 20:37:25,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 69 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1285 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=345, Invalid=4220, Unknown=3, NotChecked=402, Total=4970 [2021-11-25 20:37:25,131 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 71 mSDsluCounter, 700 mSDsCounter, 0 mSdLazyCounter, 511 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 645 SdHoareTripleChecker+Invalid, 675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:25,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 645 Invalid, 675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 511 Invalid, 0 Unknown, 142 Unchecked, 0.3s Time] [2021-11-25 20:37:25,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-25 20:37:25,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2021-11-25 20:37:25,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 110 states have (on average 1.2636363636363637) internal successors, (139), 118 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:25,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 139 transitions. [2021-11-25 20:37:25,135 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 139 transitions. Word has length 29 [2021-11-25 20:37:25,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:25,136 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 139 transitions. [2021-11-25 20:37:25,136 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8205128205128205) internal successors, (71), 38 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) [2021-11-25 20:37:25,136 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 139 transitions. [2021-11-25 20:37:25,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-25 20:37:25,137 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:25,137 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] [2021-11-25 20:37:25,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:25,342 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:25,342 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:25,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:25,343 INFO L85 PathProgramCache]: Analyzing trace with hash 1537708518, now seen corresponding path program 1 times [2021-11-25 20:37:25,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:25,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324279339] [2021-11-25 20:37:25,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:25,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:25,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:25,464 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:25,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:25,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324279339] [2021-11-25 20:37:25,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324279339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:25,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758116105] [2021-11-25 20:37:25,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:25,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:25,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:25,466 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:25,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 20:37:25,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:25,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 20:37:25,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:25,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:25,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:25,605 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 18 treesize of output 16 [2021-11-25 20:37:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:25,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:26,053 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:26,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758116105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:26,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [576352887] [2021-11-25 20:37:26,055 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:37:26,055 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:26,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:26,055 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:26,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:26,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:26,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:26,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:26,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:26,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:26,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:26,226 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 83 treesize of output 75 [2021-11-25 20:37:26,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:26,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:26,312 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:26,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:27,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:31,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6455#(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 [2021-11-25 20:37:31,578 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:31,578 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:31,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2021-11-25 20:37:31,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627042615] [2021-11-25 20:37:31,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:31,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:37:31,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:31,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:37:31,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2021-11-25 20:37:31,580 INFO L87 Difference]: Start difference. First operand 119 states and 139 transitions. Second operand has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 22 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:31,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:31,963 INFO L93 Difference]: Finished difference Result 149 states and 174 transitions. [2021-11-25 20:37:31,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:37:31,963 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 22 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-25 20:37:31,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:31,964 INFO L225 Difference]: With dead ends: 149 [2021-11-25 20:37:31,964 INFO L226 Difference]: Without dead ends: 149 [2021-11-25 20:37:31,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=289, Invalid=1873, Unknown=0, NotChecked=0, Total=2162 [2021-11-25 20:37:31,965 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 476 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:31,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [476 Valid, 197 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:31,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-25 20:37:31,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 135. [2021-11-25 20:37:31,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 126 states have (on average 1.3333333333333333) internal successors, (168), 134 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:31,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 168 transitions. [2021-11-25 20:37:31,970 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 168 transitions. Word has length 29 [2021-11-25 20:37:31,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:31,970 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 168 transitions. [2021-11-25 20:37:31,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.272727272727273) internal successors, (72), 22 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:31,970 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 168 transitions. [2021-11-25 20:37:31,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-25 20:37:31,971 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:31,971 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] [2021-11-25 20:37:31,992 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-11-25 20:37:32,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-25 20:37:32,175 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:32,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:32,175 INFO L85 PathProgramCache]: Analyzing trace with hash 424283250, now seen corresponding path program 1 times [2021-11-25 20:37:32,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:32,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284291575] [2021-11-25 20:37:32,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:32,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:32,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:32,276 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:32,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:32,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284291575] [2021-11-25 20:37:32,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284291575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:32,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684521207] [2021-11-25 20:37:32,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:32,277 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:32,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:32,278 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:32,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 20:37:32,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:32,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-25 20:37:32,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:32,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:32,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:32,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:37:32,621 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:32,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:32,876 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:32,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684521207] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:32,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:37:32,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7, 7] total 21 [2021-11-25 20:37:32,876 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935196038] [2021-11-25 20:37:32,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:32,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 20:37:32,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:32,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 20:37:32,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2021-11-25 20:37:32,878 INFO L87 Difference]: Start difference. First operand 135 states and 168 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 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) [2021-11-25 20:37:33,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:33,053 INFO L93 Difference]: Finished difference Result 156 states and 182 transitions. [2021-11-25 20:37:33,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:37:33,053 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 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 30 [2021-11-25 20:37:33,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:33,054 INFO L225 Difference]: With dead ends: 156 [2021-11-25 20:37:33,054 INFO L226 Difference]: Without dead ends: 156 [2021-11-25 20:37:33,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=647, Unknown=0, NotChecked=0, Total=756 [2021-11-25 20:37:33,056 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 232 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:33,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [232 Valid, 90 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:33,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-25 20:37:33,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 135. [2021-11-25 20:37:33,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 127 states have (on average 1.31496062992126) internal successors, (167), 134 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:33,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 167 transitions. [2021-11-25 20:37:33,060 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 167 transitions. Word has length 30 [2021-11-25 20:37:33,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:33,061 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 167 transitions. [2021-11-25 20:37:33,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 8 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) [2021-11-25 20:37:33,061 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 167 transitions. [2021-11-25 20:37:33,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:37:33,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:33,062 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] [2021-11-25 20:37:33,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:33,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-25 20:37:33,271 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:33,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:33,271 INFO L85 PathProgramCache]: Analyzing trace with hash 2084865842, now seen corresponding path program 4 times [2021-11-25 20:37:33,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:33,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993018009] [2021-11-25 20:37:33,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:33,271 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:33,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:33,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:33,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993018009] [2021-11-25 20:37:33,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993018009] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:33,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306903110] [2021-11-25 20:37:33,404 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:37:33,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:33,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:33,405 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:33,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 20:37:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:33,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-25 20:37:33,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:33,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:33,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:33,540 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 10 treesize of output 8 [2021-11-25 20:37:33,856 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:33,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:34,180 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:34,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306903110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:34,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1690646479] [2021-11-25 20:37:34,182 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:37:34,182 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:34,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:34,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:34,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:34,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:34,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:34,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:37:34,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:34,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:34,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:34,371 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 83 treesize of output 75 [2021-11-25 20:37:34,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:34,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:34,489 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:34,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:35,162 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:40,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7478#(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 [2021-11-25 20:37:40,215 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:40,215 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:40,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2021-11-25 20:37:40,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785113709] [2021-11-25 20:37:40,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:40,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:37:40,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:40,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:37:40,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1830, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:37:40,217 INFO L87 Difference]: Start difference. First operand 135 states and 167 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) [2021-11-25 20:37:40,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:40,814 INFO L93 Difference]: Finished difference Result 223 states and 272 transitions. [2021-11-25 20:37:40,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:37:40,815 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 [2021-11-25 20:37:40,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:40,816 INFO L225 Difference]: With dead ends: 223 [2021-11-25 20:37:40,816 INFO L226 Difference]: Without dead ends: 223 [2021-11-25 20:37:40,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 744 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=421, Invalid=2771, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:37:40,817 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 567 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 750 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 577 SdHoareTripleChecker+Invalid, 771 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 750 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:40,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [567 Valid, 577 Invalid, 771 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 750 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:37:40,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2021-11-25 20:37:40,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 168. [2021-11-25 20:37:40,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 160 states have (on average 1.35) internal successors, (216), 167 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:40,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 216 transitions. [2021-11-25 20:37:40,824 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 216 transitions. Word has length 31 [2021-11-25 20:37:40,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:40,824 INFO L470 AbstractCegarLoop]: Abstraction has 168 states and 216 transitions. [2021-11-25 20:37:40,825 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) [2021-11-25 20:37:40,825 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 216 transitions. [2021-11-25 20:37:40,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:37:40,826 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:40,826 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] [2021-11-25 20:37:40,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:41,038 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-25 20:37:41,039 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:41,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:41,039 INFO L85 PathProgramCache]: Analyzing trace with hash 267880938, now seen corresponding path program 1 times [2021-11-25 20:37:41,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:41,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950629067] [2021-11-25 20:37:41,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:41,039 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:41,087 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 20:37:41,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:41,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950629067] [2021-11-25 20:37:41,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950629067] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:41,088 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:41,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:37:41,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112397608] [2021-11-25 20:37:41,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:41,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:37:41,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:41,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:37:41,089 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:37:41,089 INFO L87 Difference]: Start difference. First operand 168 states and 216 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 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) [2021-11-25 20:37:41,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:41,165 INFO L93 Difference]: Finished difference Result 180 states and 228 transitions. [2021-11-25 20:37:41,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:37:41,165 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 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 31 [2021-11-25 20:37:41,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:41,167 INFO L225 Difference]: With dead ends: 180 [2021-11-25 20:37:41,167 INFO L226 Difference]: Without dead ends: 180 [2021-11-25 20:37:41,167 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 [2021-11-25 20:37:41,168 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 89 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 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 [2021-11-25 20:37:41,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 65 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:41,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-25 20:37:41,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 167. [2021-11-25 20:37:41,173 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) [2021-11-25 20:37:41,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 213 transitions. [2021-11-25 20:37:41,174 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 213 transitions. Word has length 31 [2021-11-25 20:37:41,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:41,175 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 213 transitions. [2021-11-25 20:37:41,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 6 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) [2021-11-25 20:37:41,175 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 213 transitions. [2021-11-25 20:37:41,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 20:37:41,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:41,176 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] [2021-11-25 20:37:41,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-11-25 20:37:41,176 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:41,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:41,177 INFO L85 PathProgramCache]: Analyzing trace with hash 267880939, now seen corresponding path program 1 times [2021-11-25 20:37:41,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:41,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791366768] [2021-11-25 20:37:41,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:41,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:41,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:41,312 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:41,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:41,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791366768] [2021-11-25 20:37:41,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791366768] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:41,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356461626] [2021-11-25 20:37:41,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:41,313 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:41,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:41,315 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:41,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 20:37:41,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:41,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 20:37:41,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:41,594 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:41,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:41,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:37:41,795 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:37:41,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356461626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:41,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929312393] [2021-11-25 20:37:41,797 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2021-11-25 20:37:41,797 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:41,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:41,798 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:41,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:41,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:41,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:41,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:41,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:41,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:37:41,970 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:37:41,970 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 79 treesize of output 78 [2021-11-25 20:37:42,012 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 14 treesize of output 10 [2021-11-25 20:37:42,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:42,094 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:42,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:42,531 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:46,402 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8468#(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|) (<= 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|) (= |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_#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_#t~post5#1.offset| |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= |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) (= (+ |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 [2021-11-25 20:37:46,403 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:46,403 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:46,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2021-11-25 20:37:46,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080833119] [2021-11-25 20:37:46,403 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:46,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-25 20:37:46,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:46,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-25 20:37:46,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1357, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 20:37:46,404 INFO L87 Difference]: Start difference. First operand 167 states and 213 transitions. Second operand has 21 states, 20 states have (on average 3.1) internal successors, (62), 21 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:47,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:47,108 INFO L93 Difference]: Finished difference Result 324 states and 410 transitions. [2021-11-25 20:37:47,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:37:47,109 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 3.1) internal successors, (62), 21 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-25 20:37:47,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:47,111 INFO L225 Difference]: With dead ends: 324 [2021-11-25 20:37:47,111 INFO L226 Difference]: Without dead ends: 324 [2021-11-25 20:37:47,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=475, Invalid=2495, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:37:47,112 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 520 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 520 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:47,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [520 Valid, 293 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:37:47,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-25 20:37:47,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 243. [2021-11-25 20:37:47,119 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) [2021-11-25 20:37:47,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 335 transitions. [2021-11-25 20:37:47,121 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 335 transitions. Word has length 31 [2021-11-25 20:37:47,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:47,121 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 335 transitions. [2021-11-25 20:37:47,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 3.1) internal successors, (62), 21 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:37:47,121 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 335 transitions. [2021-11-25 20:37:47,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 20:37:47,122 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:47,122 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] [2021-11-25 20:37:47,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:47,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:47,343 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:47,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:47,343 INFO L85 PathProgramCache]: Analyzing trace with hash 206291110, now seen corresponding path program 1 times [2021-11-25 20:37:47,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:47,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155011564] [2021-11-25 20:37:47,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:47,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:47,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:47,485 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:47,485 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:47,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155011564] [2021-11-25 20:37:47,485 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155011564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:47,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023866508] [2021-11-25 20:37:47,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:47,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:47,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:47,495 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:47,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-25 20:37:47,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:47,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 20:37:47,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:47,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:47,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:47,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:37:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:47,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:48,226 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:37:48,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023866508] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:48,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1108538605] [2021-11-25 20:37:48,228 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 20:37:48,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:48,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:48,229 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:48,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:48,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:48,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:48,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:37:48,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:48,341 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 11 treesize of output 7 [2021-11-25 20:37:48,403 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:37:48,403 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 79 treesize of output 78 [2021-11-25 20:37:48,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:48,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:48,538 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:48,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:48,960 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:37:53,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9299#(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 [2021-11-25 20:37:53,530 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:37:53,530 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:37:53,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2021-11-25 20:37:53,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621629619] [2021-11-25 20:37:53,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:37:53,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:37:53,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:53,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:37:53,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=2080, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:37:53,533 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) [2021-11-25 20:37:54,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:54,240 INFO L93 Difference]: Finished difference Result 391 states and 508 transitions. [2021-11-25 20:37:54,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 20:37:54,240 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 [2021-11-25 20:37:54,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:54,243 INFO L225 Difference]: With dead ends: 391 [2021-11-25 20:37:54,243 INFO L226 Difference]: Without dead ends: 391 [2021-11-25 20:37:54,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 918 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=498, Invalid=3284, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 20:37:54,245 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 657 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 689 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 657 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:54,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [657 Valid, 515 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 689 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:37:54,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-25 20:37:54,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 235. [2021-11-25 20:37:54,253 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) [2021-11-25 20:37:54,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 323 transitions. [2021-11-25 20:37:54,255 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 323 transitions. Word has length 32 [2021-11-25 20:37:54,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:54,255 INFO L470 AbstractCegarLoop]: Abstraction has 235 states and 323 transitions. [2021-11-25 20:37:54,255 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) [2021-11-25 20:37:54,255 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 323 transitions. [2021-11-25 20:37:54,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 20:37:54,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:54,256 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] [2021-11-25 20:37:54,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-25 20:37:54,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:54,470 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr22REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:54,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:54,471 INFO L85 PathProgramCache]: Analyzing trace with hash -264452917, now seen corresponding path program 1 times [2021-11-25 20:37:54,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:54,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277635632] [2021-11-25 20:37:54,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:54,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:54,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:54,528 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 20:37:54,529 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:54,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277635632] [2021-11-25 20:37:54,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277635632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:54,529 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:54,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 20:37:54,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796150386] [2021-11-25 20:37:54,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:54,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:37:54,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:54,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:37:54,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 20:37:54,531 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) [2021-11-25 20:37:54,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:54,607 INFO L93 Difference]: Finished difference Result 260 states and 346 transitions. [2021-11-25 20:37:54,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:37:54,608 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 [2021-11-25 20:37:54,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:54,609 INFO L225 Difference]: With dead ends: 260 [2021-11-25 20:37:54,609 INFO L226 Difference]: Without dead ends: 260 [2021-11-25 20:37:54,609 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 [2021-11-25 20:37:54,610 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 [2021-11-25 20:37:54,610 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] [2021-11-25 20:37:54,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-11-25 20:37:54,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 234. [2021-11-25 20:37:54,616 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) [2021-11-25 20:37:54,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 315 transitions. [2021-11-25 20:37:54,618 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 315 transitions. Word has length 33 [2021-11-25 20:37:54,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:54,618 INFO L470 AbstractCegarLoop]: Abstraction has 234 states and 315 transitions. [2021-11-25 20:37:54,618 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) [2021-11-25 20:37:54,618 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 315 transitions. [2021-11-25 20:37:54,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 20:37:54,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:54,619 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] [2021-11-25 20:37:54,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2021-11-25 20:37:54,620 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:54,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:54,620 INFO L85 PathProgramCache]: Analyzing trace with hash -264452916, now seen corresponding path program 1 times [2021-11-25 20:37:54,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:54,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969261738] [2021-11-25 20:37:54,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:54,621 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:54,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:54,711 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:37:54,711 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:54,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969261738] [2021-11-25 20:37:54,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [969261738] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:37:54,712 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:37:54,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 20:37:54,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259321117] [2021-11-25 20:37:54,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:37:54,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 20:37:54,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:37:54,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 20:37:54,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 20:37:54,713 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) [2021-11-25 20:37:54,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:37:54,856 INFO L93 Difference]: Finished difference Result 296 states and 379 transitions. [2021-11-25 20:37:54,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-25 20:37:54,857 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 [2021-11-25 20:37:54,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:37:54,858 INFO L225 Difference]: With dead ends: 296 [2021-11-25 20:37:54,858 INFO L226 Difference]: Without dead ends: 296 [2021-11-25 20:37:54,859 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 [2021-11-25 20:37:54,859 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 64 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:37:54,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 116 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:37:54,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2021-11-25 20:37:54,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 233. [2021-11-25 20:37:54,866 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) [2021-11-25 20:37:54,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 307 transitions. [2021-11-25 20:37:54,867 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 307 transitions. Word has length 33 [2021-11-25 20:37:54,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:37:54,867 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 307 transitions. [2021-11-25 20:37:54,867 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) [2021-11-25 20:37:54,867 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 307 transitions. [2021-11-25 20:37:54,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-25 20:37:54,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:37:54,868 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] [2021-11-25 20:37:54,868 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2021-11-25 20:37:54,869 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:37:54,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:37:54,869 INFO L85 PathProgramCache]: Analyzing trace with hash 1032420846, now seen corresponding path program 2 times [2021-11-25 20:37:54,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:37:54,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21047305] [2021-11-25 20:37:54,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:37:54,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:37:54,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:37:55,159 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:55,160 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:37:55,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21047305] [2021-11-25 20:37:55,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21047305] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:37:55,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027454552] [2021-11-25 20:37:55,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:37:55,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:37:55,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:37:55,161 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:37:55,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-25 20:37:55,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:37:55,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:37:55,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-25 20:37:55,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:37:55,272 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 [2021-11-25 20:37:55,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:55,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:37:55,694 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-25 20:37:55,694 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 18 treesize of output 10 [2021-11-25 20:37:55,700 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:55,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:37:55,794 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_889 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_889) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2021-11-25 20:37:55,800 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:37:55,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:37:55,805 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:37:55,805 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 37 treesize of output 37 [2021-11-25 20:37:55,807 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 11 treesize of output 7 [2021-11-25 20:37:55,972 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:37:55,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027454552] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:37:55,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1213423683] [2021-11-25 20:37:55,974 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:37:55,974 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:37:55,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:37:55,974 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:37:55,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:37:56,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:37:56,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:37:56,043 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 14 treesize of output 10 [2021-11-25 20:37:56,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:37:56,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:37:56,149 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:37:56,150 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 79 treesize of output 78 [2021-11-25 20:37:56,200 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 14 treesize of output 10 [2021-11-25 20:37:56,222 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 14 treesize of output 10 [2021-11-25 20:37:56,259 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:37:56,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:37:56,934 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:01,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11247#(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 [2021-11-25 20:38:01,575 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:01,575 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:01,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 27 [2021-11-25 20:38:01,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727247957] [2021-11-25 20:38:01,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:01,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-25 20:38:01,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:01,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-25 20:38:01,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1660, Unknown=1, NotChecked=82, Total=1892 [2021-11-25 20:38:01,576 INFO L87 Difference]: Start difference. First operand 233 states and 307 transitions. Second operand has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:02,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:02,189 INFO L93 Difference]: Finished difference Result 268 states and 350 transitions. [2021-11-25 20:38:02,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 20:38:02,199 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-25 20:38:02,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:02,200 INFO L225 Difference]: With dead ends: 268 [2021-11-25 20:38:02,201 INFO L226 Difference]: Without dead ends: 261 [2021-11-25 20:38:02,201 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 1 IntricatePredicates, 2 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=231, Invalid=2634, Unknown=1, NotChecked=104, Total=2970 [2021-11-25 20:38:02,202 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 58 mSDsluCounter, 790 mSDsCounter, 0 mSdLazyCounter, 548 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:02,202 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 691 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 548 Invalid, 0 Unknown, 139 Unchecked, 0.3s Time] [2021-11-25 20:38:02,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-25 20:38:02,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 256. [2021-11-25 20:38:02,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 251 states have (on average 1.3386454183266931) internal successors, (336), 255 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) [2021-11-25 20:38:02,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 336 transitions. [2021-11-25 20:38:02,209 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 336 transitions. Word has length 33 [2021-11-25 20:38:02,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:02,209 INFO L470 AbstractCegarLoop]: Abstraction has 256 states and 336 transitions. [2021-11-25 20:38:02,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:02,210 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 336 transitions. [2021-11-25 20:38:02,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 20:38:02,210 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:02,211 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] [2021-11-25 20:38:02,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:02,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-25 20:38:02,424 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:02,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:02,424 INFO L85 PathProgramCache]: Analyzing trace with hash 391886083, now seen corresponding path program 1 times [2021-11-25 20:38:02,424 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:02,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408642902] [2021-11-25 20:38:02,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:02,424 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:02,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:02,462 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:38:02,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:02,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408642902] [2021-11-25 20:38:02,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408642902] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:38:02,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:38:02,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:38:02,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377314568] [2021-11-25 20:38:02,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:38:02,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:38:02,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:02,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:38:02,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 20:38:02,464 INFO L87 Difference]: Start difference. First operand 256 states and 336 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) [2021-11-25 20:38:02,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:02,528 INFO L93 Difference]: Finished difference Result 291 states and 369 transitions. [2021-11-25 20:38:02,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:38:02,528 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 [2021-11-25 20:38:02,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:02,530 INFO L225 Difference]: With dead ends: 291 [2021-11-25 20:38:02,530 INFO L226 Difference]: Without dead ends: 291 [2021-11-25 20:38:02,531 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 [2021-11-25 20:38:02,537 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 [2021-11-25 20:38:02,537 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] [2021-11-25 20:38:02,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2021-11-25 20:38:02,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 255. [2021-11-25 20:38:02,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 251 states have (on average 1.3147410358565736) internal successors, (330), 254 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:02,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 330 transitions. [2021-11-25 20:38:02,544 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 330 transitions. Word has length 34 [2021-11-25 20:38:02,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:02,544 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 330 transitions. [2021-11-25 20:38:02,544 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) [2021-11-25 20:38:02,545 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 330 transitions. [2021-11-25 20:38:02,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 20:38:02,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:02,545 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] [2021-11-25 20:38:02,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2021-11-25 20:38:02,546 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:02,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:02,546 INFO L85 PathProgramCache]: Analyzing trace with hash 391886084, now seen corresponding path program 1 times [2021-11-25 20:38:02,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:02,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310958550] [2021-11-25 20:38:02,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:02,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:02,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:02,711 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:38:02,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:02,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310958550] [2021-11-25 20:38:02,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310958550] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:02,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649072467] [2021-11-25 20:38:02,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:02,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:02,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:02,713 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:02,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-25 20:38:02,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:02,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:38:02,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:02,999 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:38:02,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:03,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:38:03,201 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 20:38:03,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649072467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:03,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1548357650] [2021-11-25 20:38:03,203 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 20:38:03,203 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:03,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:03,203 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:03,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:03,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:03,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:38:03,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:03,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:03,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:03,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:03,374 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 83 treesize of output 75 [2021-11-25 20:38:03,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:03,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:03,458 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:38:03,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:38:03,879 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:08,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1548357650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:38:08,890 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:08,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [10, 10, 10] total 44 [2021-11-25 20:38:08,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67452129] [2021-11-25 20:38:08,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:38:08,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-25 20:38:08,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:08,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-25 20:38:08,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1729, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:38:08,892 INFO L87 Difference]: Start difference. First operand 255 states and 330 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) [2021-11-25 20:38:14,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:14,361 INFO L93 Difference]: Finished difference Result 272 states and 343 transitions. [2021-11-25 20:38:14,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:38:14,361 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 [2021-11-25 20:38:14,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:14,362 INFO L225 Difference]: With dead ends: 272 [2021-11-25 20:38:14,362 INFO L226 Difference]: Without dead ends: 270 [2021-11-25 20:38:14,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=422, Invalid=2770, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:38:14,363 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 163 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:14,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 202 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:38:14,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-25 20:38:14,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 257. [2021-11-25 20:38:14,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 253 states have (on average 1.308300395256917) internal successors, (331), 256 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:14,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 331 transitions. [2021-11-25 20:38:14,370 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 331 transitions. Word has length 34 [2021-11-25 20:38:14,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:14,370 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 331 transitions. [2021-11-25 20:38:14,370 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) [2021-11-25 20:38:14,370 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 331 transitions. [2021-11-25 20:38:14,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-25 20:38:14,371 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:14,371 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] [2021-11-25 20:38:14,408 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:14,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-25 20:38:14,590 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:14,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:14,590 INFO L85 PathProgramCache]: Analyzing trace with hash 819129658, now seen corresponding path program 5 times [2021-11-25 20:38:14,590 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:14,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016286044] [2021-11-25 20:38:14,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:14,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:14,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:15,321 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 8 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:38:15,321 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:15,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016286044] [2021-11-25 20:38:15,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016286044] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:15,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184893913] [2021-11-25 20:38:15,322 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:15,322 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:15,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:15,327 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:15,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-25 20:38:15,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:38:15,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:15,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-25 20:38:15,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:15,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:38:15,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:38:15,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:15,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:38:16,259 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:16,260 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 20 treesize of output 20 [2021-11-25 20:38:16,415 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 20:38:16,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:16,906 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:16,906 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-11-25 20:38:16,915 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:16,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 33 [2021-11-25 20:38:16,920 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 9 treesize of output 7 [2021-11-25 20:38:17,148 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 20:38:17,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184893913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:17,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019048037] [2021-11-25 20:38:17,150 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:38:17,150 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:17,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:17,150 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:17,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:17,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:17,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:38:17,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:38:17,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:17,272 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 11 treesize of output 7 [2021-11-25 20:38:17,330 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:38:17,331 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 79 treesize of output 78 [2021-11-25 20:38:17,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:17,422 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 14 treesize of output 10 [2021-11-25 20:38:17,479 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:38:17,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:38:17,821 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:21,551 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13397#(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|) (<= |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) (<= 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 [2021-11-25 20:38:21,551 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:21,552 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:21,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 7, 7] total 32 [2021-11-25 20:38:21,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557216373] [2021-11-25 20:38:21,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:21,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:38:21,552 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:21,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:38:21,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=2233, Unknown=10, NotChecked=0, Total=2450 [2021-11-25 20:38:21,553 INFO L87 Difference]: Start difference. First operand 257 states and 331 transitions. Second operand has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 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) [2021-11-25 20:38:23,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:23,785 INFO L93 Difference]: Finished difference Result 321 states and 405 transitions. [2021-11-25 20:38:23,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-25 20:38:23,786 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 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 [2021-11-25 20:38:23,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:23,787 INFO L225 Difference]: With dead ends: 321 [2021-11-25 20:38:23,788 INFO L226 Difference]: Without dead ends: 318 [2021-11-25 20:38:23,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1522 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=511, Invalid=6285, Unknown=10, NotChecked=0, Total=6806 [2021-11-25 20:38:23,789 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 46 mSDsluCounter, 490 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 647 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:23,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 469 Invalid, 647 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 516 Invalid, 0 Unknown, 112 Unchecked, 0.3s Time] [2021-11-25 20:38:23,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-11-25 20:38:23,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 296. [2021-11-25 20:38:23,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 292 states have (on average 1.2910958904109588) internal successors, (377), 295 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:23,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 377 transitions. [2021-11-25 20:38:23,796 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 377 transitions. Word has length 35 [2021-11-25 20:38:23,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:23,797 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 377 transitions. [2021-11-25 20:38:23,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 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) [2021-11-25 20:38:23,797 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 377 transitions. [2021-11-25 20:38:23,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 20:38:23,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:23,798 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] [2021-11-25 20:38:23,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:24,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:24,022 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:24,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:24,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1925173448, now seen corresponding path program 1 times [2021-11-25 20:38:24,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:24,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227996695] [2021-11-25 20:38:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:24,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:24,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:24,177 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:38:24,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:24,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227996695] [2021-11-25 20:38:24,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1227996695] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:24,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934211476] [2021-11-25 20:38:24,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:24,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:24,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:24,183 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:24,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-25 20:38:24,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:24,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 20:38:24,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:24,513 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:38:24,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:24,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:38:24,715 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:38:24,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934211476] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:24,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [931503070] [2021-11-25 20:38:24,716 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 20:38:24,716 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:24,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:24,717 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:24,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:24,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:24,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:38:24,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:24,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:24,842 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 11 treesize of output 7 [2021-11-25 20:38:24,887 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:38:24,888 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 79 treesize of output 78 [2021-11-25 20:38:24,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:24,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:25,010 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:38:25,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:38:25,383 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:30,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [931503070] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:38:30,935 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:30,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [9, 9, 9] total 43 [2021-11-25 20:38:30,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389102368] [2021-11-25 20:38:30,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:38:30,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 20:38:30,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:30,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 20:38:30,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1621, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 20:38:30,936 INFO L87 Difference]: Start difference. First operand 296 states and 377 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) [2021-11-25 20:38:34,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:34,983 INFO L93 Difference]: Finished difference Result 404 states and 508 transitions. [2021-11-25 20:38:34,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:38:34,983 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 [2021-11-25 20:38:34,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:34,985 INFO L225 Difference]: With dead ends: 404 [2021-11-25 20:38:34,985 INFO L226 Difference]: Without dead ends: 404 [2021-11-25 20:38:34,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=425, Invalid=2437, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:38:34,986 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 202 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:34,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 163 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:38:34,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-11-25 20:38:34,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 363. [2021-11-25 20:38:34,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 359 states have (on average 1.3147632311977715) internal successors, (472), 362 states have internal predecessors, (472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:34,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 472 transitions. [2021-11-25 20:38:34,996 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 472 transitions. Word has length 36 [2021-11-25 20:38:34,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:34,996 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 472 transitions. [2021-11-25 20:38:34,996 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) [2021-11-25 20:38:34,997 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 472 transitions. [2021-11-25 20:38:34,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 20:38:34,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:34,998 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] [2021-11-25 20:38:35,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:35,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-25 20:38:35,211 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:35,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:35,211 INFO L85 PathProgramCache]: Analyzing trace with hash -1346682423, now seen corresponding path program 1 times [2021-11-25 20:38:35,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:35,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21630837] [2021-11-25 20:38:35,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:35,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:35,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:35,304 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 20:38:35,305 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:35,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21630837] [2021-11-25 20:38:35,305 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21630837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:35,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825204218] [2021-11-25 20:38:35,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:35,306 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:35,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:35,306 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:35,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-25 20:38:35,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:35,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-25 20:38:35,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:35,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:38:35,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:35,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:38:36,701 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:38:36,702 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 14 [2021-11-25 20:38:36,743 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:38:36,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:37,213 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1071 (Array Int Int)) (|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|v_ULTIMATE.start_cstrstr_#t~post17#1.offset_115| Int)) (let ((.cse0 (select v_ArrVal_1071 (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= .cse0 0) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_115|) (< |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_115| 0) (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1071) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_115| 1)) .cse0))))) is different from false [2021-11-25 20:38:37,223 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:37,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 29 [2021-11-25 20:38:37,229 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:37,230 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 48 treesize of output 48 [2021-11-25 20:38:37,237 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:37,237 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 38 treesize of output 34 [2021-11-25 20:38:37,671 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:38:37,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825204218] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:37,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1824234847] [2021-11-25 20:38:37,673 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:38:37,673 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:37,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:37,673 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:37,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:37,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:37,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:38:37,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:37,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:37,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:38:37,840 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:38:37,840 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 79 treesize of output 78 [2021-11-25 20:38:37,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:37,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:37,956 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:38:37,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:38:39,303 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:38:46,506 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15392#(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 [2021-11-25 20:38:46,506 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:38:46,506 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:38:46,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 17, 16] total 38 [2021-11-25 20:38:46,507 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485870001] [2021-11-25 20:38:46,507 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:38:46,507 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:38:46,507 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:46,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:38:46,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=3326, Unknown=1, NotChecked=116, Total=3660 [2021-11-25 20:38:46,508 INFO L87 Difference]: Start difference. First operand 363 states and 472 transitions. Second operand has 38 states, 38 states have (on average 2.3947368421052633) internal successors, (91), 38 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) [2021-11-25 20:38:47,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:47,169 INFO L93 Difference]: Finished difference Result 447 states and 560 transitions. [2021-11-25 20:38:47,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 20:38:47,169 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.3947368421052633) internal successors, (91), 38 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 36 [2021-11-25 20:38:47,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:47,171 INFO L225 Difference]: With dead ends: 447 [2021-11-25 20:38:47,172 INFO L226 Difference]: Without dead ends: 386 [2021-11-25 20:38:47,172 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1250 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=305, Invalid=4954, Unknown=1, NotChecked=142, Total=5402 [2021-11-25 20:38:47,173 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 78 mSDsluCounter, 1187 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 1057 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 340 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:38:47,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 1057 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 473 Invalid, 0 Unknown, 340 Unchecked, 0.2s Time] [2021-11-25 20:38:47,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2021-11-25 20:38:47,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 348. [2021-11-25 20:38:47,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 348 states, 344 states have (on average 1.3343023255813953) internal successors, (459), 347 states have internal predecessors, (459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:47,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 459 transitions. [2021-11-25 20:38:47,181 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 459 transitions. Word has length 36 [2021-11-25 20:38:47,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:47,182 INFO L470 AbstractCegarLoop]: Abstraction has 348 states and 459 transitions. [2021-11-25 20:38:47,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.3947368421052633) internal successors, (91), 38 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) [2021-11-25 20:38:47,182 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 459 transitions. [2021-11-25 20:38:47,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-25 20:38:47,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:47,183 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] [2021-11-25 20:38:47,210 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-25 20:38:47,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-25 20:38:47,396 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:47,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:47,397 INFO L85 PathProgramCache]: Analyzing trace with hash -1440418086, now seen corresponding path program 2 times [2021-11-25 20:38:47,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:47,397 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474169788] [2021-11-25 20:38:47,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:47,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:47,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:47,545 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 20:38:47,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:47,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474169788] [2021-11-25 20:38:47,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474169788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:47,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184417192] [2021-11-25 20:38:47,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:38:47,545 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:47,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:47,547 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:47,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-25 20:38:47,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-25 20:38:47,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:47,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:38:47,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:47,786 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 20:38:47,786 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:38:47,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184417192] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:38:47,787 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:38:47,787 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 16 [2021-11-25 20:38:47,787 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790265443] [2021-11-25 20:38:47,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:38:47,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:38:47,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:38:47,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:38:47,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-11-25 20:38:47,790 INFO L87 Difference]: Start difference. First operand 348 states and 459 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) [2021-11-25 20:38:47,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:38:47,858 INFO L93 Difference]: Finished difference Result 287 states and 357 transitions. [2021-11-25 20:38:47,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 20:38:47,859 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 [2021-11-25 20:38:47,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:38:47,860 INFO L225 Difference]: With dead ends: 287 [2021-11-25 20:38:47,860 INFO L226 Difference]: Without dead ends: 287 [2021-11-25 20:38:47,861 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 [2021-11-25 20:38:47,861 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 27 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 107 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 [2021-11-25 20:38:47,861 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 107 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:38:47,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-25 20:38:47,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 243. [2021-11-25 20:38:47,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 239 states have (on average 1.288702928870293) internal successors, (308), 242 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:38:47,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 308 transitions. [2021-11-25 20:38:47,867 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 308 transitions. Word has length 38 [2021-11-25 20:38:47,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:38:47,867 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 308 transitions. [2021-11-25 20:38:47,867 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) [2021-11-25 20:38:47,868 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 308 transitions. [2021-11-25 20:38:47,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-25 20:38:47,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:38:47,868 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] [2021-11-25 20:38:47,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-25 20:38:48,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:48,095 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:38:48,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:38:48,095 INFO L85 PathProgramCache]: Analyzing trace with hash -1748585926, now seen corresponding path program 3 times [2021-11-25 20:38:48,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:38:48,095 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689292499] [2021-11-25 20:38:48,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:38:48,095 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:38:48,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:38:48,670 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:38:48,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:38:48,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689292499] [2021-11-25 20:38:48,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689292499] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:38:48,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325439975] [2021-11-25 20:38:48,670 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:38:48,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:38:48,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:38:48,675 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:38:48,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-25 20:38:48,859 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:38:48,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:38:48,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-25 20:38:48,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:38:49,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:49,285 INFO L354 Elim1Store]: treesize reduction 28, result has 41.7 percent of original size [2021-11-25 20:38:49,285 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 24 treesize of output 33 [2021-11-25 20:38:50,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:38:50,577 INFO L354 Elim1Store]: treesize reduction 18, result has 48.6 percent of original size [2021-11-25 20:38:50,578 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 30 treesize of output 30 [2021-11-25 20:38:50,730 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:38:50,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:38:53,555 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-25 20:38:53,555 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 219 treesize of output 222 [2021-11-25 20:38:53,566 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:53,566 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 43 treesize of output 45 [2021-11-25 20:38:53,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 20:38:53,615 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:38:53,615 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 67 treesize of output 92 [2021-11-25 20:38:53,996 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 [2021-11-25 20:38:54,306 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:38:54,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325439975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:38:54,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [844197557] [2021-11-25 20:38:54,308 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:38:54,308 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:38:54,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:38:54,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:38:54,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:38:54,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:54,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:38:54,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:38:54,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:54,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:54,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:38:54,505 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 83 treesize of output 75 [2021-11-25 20:38:54,536 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 14 treesize of output 10 [2021-11-25 20:38:54,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:38:54,613 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:38:54,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:38:55,244 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:01,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17186#(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 [2021-11-25 20:39:01,221 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:01,221 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:01,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 56 [2021-11-25 20:39:01,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850468399] [2021-11-25 20:39:01,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:01,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-25 20:39:01,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:01,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-25 20:39:01,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=4872, Unknown=0, NotChecked=0, Total=5256 [2021-11-25 20:39:01,223 INFO L87 Difference]: Start difference. First operand 243 states and 308 transitions. Second operand has 57 states, 57 states have (on average 1.8421052631578947) internal successors, (105), 56 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:02,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:02,869 INFO L93 Difference]: Finished difference Result 301 states and 376 transitions. [2021-11-25 20:39:02,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:39:02,870 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.8421052631578947) internal successors, (105), 56 states have internal predecessors, (105), 0 states have call successors, (0), 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 [2021-11-25 20:39:02,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:02,871 INFO L225 Difference]: With dead ends: 301 [2021-11-25 20:39:02,871 INFO L226 Difference]: Without dead ends: 298 [2021-11-25 20:39:02,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1931 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=689, Invalid=9013, Unknown=0, NotChecked=0, Total=9702 [2021-11-25 20:39:02,873 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 146 mSDsluCounter, 821 mSDsCounter, 0 mSdLazyCounter, 638 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 780 SdHoareTripleChecker+Invalid, 1022 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 638 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 364 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:02,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 780 Invalid, 1022 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 638 Invalid, 0 Unknown, 364 Unchecked, 0.3s Time] [2021-11-25 20:39:02,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-25 20:39:02,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 287. [2021-11-25 20:39:02,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 283 states have (on average 1.2791519434628975) internal successors, (362), 286 states have internal predecessors, (362), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:02,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 362 transitions. [2021-11-25 20:39:02,879 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 362 transitions. Word has length 39 [2021-11-25 20:39:02,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:02,879 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 362 transitions. [2021-11-25 20:39:02,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.8421052631578947) internal successors, (105), 56 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:02,879 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 362 transitions. [2021-11-25 20:39:02,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:39:02,880 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:02,880 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:02,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:03,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-25 20:39:03,091 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:03,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:03,091 INFO L85 PathProgramCache]: Analyzing trace with hash -615483907, now seen corresponding path program 1 times [2021-11-25 20:39:03,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:03,091 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334506230] [2021-11-25 20:39:03,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:03,091 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:03,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:03,126 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:39:03,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:03,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334506230] [2021-11-25 20:39:03,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334506230] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:03,127 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:39:03,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 20:39:03,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969625308] [2021-11-25 20:39:03,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:03,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:39:03,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:03,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:39:03,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:39:03,129 INFO L87 Difference]: Start difference. First operand 287 states and 362 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:03,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:03,163 INFO L93 Difference]: Finished difference Result 280 states and 346 transitions. [2021-11-25 20:39:03,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:39:03,163 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-25 20:39:03,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:03,165 INFO L225 Difference]: With dead ends: 280 [2021-11-25 20:39:03,165 INFO L226 Difference]: Without dead ends: 214 [2021-11-25 20:39:03,165 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 [2021-11-25 20:39:03,167 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 [2021-11-25 20:39:03,167 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] [2021-11-25 20:39:03,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-25 20:39:03,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2021-11-25 20:39:03,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 210 states have (on average 1.2047619047619047) internal successors, (253), 213 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:03,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 253 transitions. [2021-11-25 20:39:03,173 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 253 transitions. Word has length 40 [2021-11-25 20:39:03,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:03,174 INFO L470 AbstractCegarLoop]: Abstraction has 214 states and 253 transitions. [2021-11-25 20:39:03,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:03,175 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 253 transitions. [2021-11-25 20:39:03,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 20:39:03,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:03,176 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] [2021-11-25 20:39:03,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2021-11-25 20:39:03,176 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:03,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:03,176 INFO L85 PathProgramCache]: Analyzing trace with hash 80022072, now seen corresponding path program 1 times [2021-11-25 20:39:03,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:03,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49195145] [2021-11-25 20:39:03,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:03,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:03,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:03,356 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:39:03,356 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:03,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49195145] [2021-11-25 20:39:03,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [49195145] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:03,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [90610024] [2021-11-25 20:39:03,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:03,357 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:03,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:03,362 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:03,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-25 20:39:03,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:03,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 20:39:03,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:03,705 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:39:03,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:03,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:39:03,935 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:39:03,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [90610024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:03,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1744818622] [2021-11-25 20:39:03,936 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 20:39:03,936 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:03,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:03,936 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:03,937 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:03,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:03,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:04,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:39:04,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:04,054 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 14 treesize of output 10 [2021-11-25 20:39:04,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:04,091 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 83 treesize of output 75 [2021-11-25 20:39:04,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:04,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:04,174 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:39:04,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:39:04,750 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:09,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1744818622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:39:09,726 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:09,726 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [10, 10, 10] total 45 [2021-11-25 20:39:09,726 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724679301] [2021-11-25 20:39:09,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:39:09,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-25 20:39:09,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:09,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-25 20:39:09,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1809, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 20:39:09,727 INFO L87 Difference]: Start difference. First operand 214 states and 253 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) [2021-11-25 20:39:14,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:14,727 INFO L93 Difference]: Finished difference Result 234 states and 272 transitions. [2021-11-25 20:39:14,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:39:14,727 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 [2021-11-25 20:39:14,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:14,728 INFO L225 Difference]: With dead ends: 234 [2021-11-25 20:39:14,728 INFO L226 Difference]: Without dead ends: 234 [2021-11-25 20:39:14,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=444, Invalid=2862, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 20:39:14,729 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 97 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:14,729 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 61 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:39:14,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2021-11-25 20:39:14,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 218. [2021-11-25 20:39:14,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 214 states have (on average 1.2009345794392523) internal successors, (257), 217 states have internal predecessors, (257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:14,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 257 transitions. [2021-11-25 20:39:14,733 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 257 transitions. Word has length 40 [2021-11-25 20:39:14,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:14,733 INFO L470 AbstractCegarLoop]: Abstraction has 218 states and 257 transitions. [2021-11-25 20:39:14,733 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) [2021-11-25 20:39:14,734 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 257 transitions. [2021-11-25 20:39:14,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 20:39:14,734 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:14,734 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] [2021-11-25 20:39:14,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:14,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:14,943 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:14,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:14,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1444008922, now seen corresponding path program 1 times [2021-11-25 20:39:14,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:14,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891949743] [2021-11-25 20:39:14,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:14,943 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:14,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:15,126 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 6 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:15,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:15,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891949743] [2021-11-25 20:39:15,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891949743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:15,126 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69035476] [2021-11-25 20:39:15,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:15,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:15,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:15,128 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:15,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-25 20:39:15,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:15,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-25 20:39:15,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:15,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:15,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:15,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:39:15,766 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 9 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:15,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:16,186 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 16 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:16,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69035476] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:16,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [195207272] [2021-11-25 20:39:16,187 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 20:39:16,187 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:16,187 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:16,187 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:16,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:16,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:16,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:16,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:16,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:16,304 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 11 treesize of output 7 [2021-11-25 20:39:16,354 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:39:16,354 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 79 treesize of output 78 [2021-11-25 20:39:16,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:16,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:16,451 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:39:16,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:39:17,131 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:22,273 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19382#(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 [2021-11-25 20:39:22,273 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:22,273 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:22,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2021-11-25 20:39:22,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123738327] [2021-11-25 20:39:22,273 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:22,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:39:22,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:22,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:39:22,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=2597, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:39:22,274 INFO L87 Difference]: Start difference. First operand 218 states and 257 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) [2021-11-25 20:39:23,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:23,316 INFO L93 Difference]: Finished difference Result 401 states and 464 transitions. [2021-11-25 20:39:23,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-25 20:39:23,316 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 [2021-11-25 20:39:23,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:23,318 INFO L225 Difference]: With dead ends: 401 [2021-11-25 20:39:23,319 INFO L226 Difference]: Without dead ends: 401 [2021-11-25 20:39:23,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1192 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=634, Invalid=4336, Unknown=0, NotChecked=0, Total=4970 [2021-11-25 20:39:23,320 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 457 mSDsluCounter, 683 mSDsCounter, 0 mSdLazyCounter, 1116 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 637 SdHoareTripleChecker+Invalid, 1151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:23,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [457 Valid, 637 Invalid, 1151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1116 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:39:23,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-25 20:39:23,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 298. [2021-11-25 20:39:23,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 294 states have (on average 1.2006802721088434) internal successors, (353), 297 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:23,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 353 transitions. [2021-11-25 20:39:23,327 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 353 transitions. Word has length 42 [2021-11-25 20:39:23,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:23,328 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 353 transitions. [2021-11-25 20:39:23,328 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) [2021-11-25 20:39:23,328 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 353 transitions. [2021-11-25 20:39:23,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-25 20:39:23,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:23,329 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] [2021-11-25 20:39:23,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:23,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-25 20:39:23,555 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:23,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:23,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1354927365, now seen corresponding path program 2 times [2021-11-25 20:39:23,555 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:23,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585669658] [2021-11-25 20:39:23,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:23,555 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:23,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:23,678 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:23,678 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:23,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585669658] [2021-11-25 20:39:23,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585669658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:23,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779698945] [2021-11-25 20:39:23,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:39:23,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:23,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:23,683 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:23,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-25 20:39:23,836 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:39:23,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:23,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-25 20:39:23,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:23,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:39:23,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:23,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:39:24,379 INFO L354 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2021-11-25 20:39:24,379 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 2 case distinctions, treesize of input 25 treesize of output 23 [2021-11-25 20:39:24,444 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 20:39:24,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:24,898 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:39:24,899 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 34 [2021-11-25 20:39:24,902 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:39:24,927 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:39:24,928 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 2 case distinctions, treesize of input 58 treesize of output 65 [2021-11-25 20:39:24,932 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:39:24,933 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 21 treesize of output 15 [2021-11-25 20:39:24,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-25 20:39:25,174 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 20:39:25,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779698945] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:25,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102856091] [2021-11-25 20:39:25,176 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:39:25,176 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:25,176 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:25,176 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:25,176 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:25,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:25,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:25,230 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 11 treesize of output 7 [2021-11-25 20:39:25,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:25,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:25,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:25,331 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 83 treesize of output 75 [2021-11-25 20:39:25,379 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 14 treesize of output 10 [2021-11-25 20:39:25,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:25,433 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:39:25,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:39:26,748 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:34,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20411#(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 [2021-11-25 20:39:34,335 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:34,335 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:34,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 29 [2021-11-25 20:39:34,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386910953] [2021-11-25 20:39:34,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:34,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 20:39:34,336 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:34,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 20:39:34,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=2629, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:39:34,337 INFO L87 Difference]: Start difference. First operand 298 states and 353 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) [2021-11-25 20:39:34,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:34,842 INFO L93 Difference]: Finished difference Result 328 states and 385 transitions. [2021-11-25 20:39:34,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-25 20:39:34,842 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 [2021-11-25 20:39:34,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:34,844 INFO L225 Difference]: With dead ends: 328 [2021-11-25 20:39:34,844 INFO L226 Difference]: Without dead ends: 328 [2021-11-25 20:39:34,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=320, Invalid=3840, Unknown=0, NotChecked=0, Total=4160 [2021-11-25 20:39:34,845 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 47 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:34,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 229 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 245 Invalid, 0 Unknown, 85 Unchecked, 0.2s Time] [2021-11-25 20:39:34,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2021-11-25 20:39:34,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 324. [2021-11-25 20:39:34,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 320 states have (on average 1.190625) internal successors, (381), 323 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:34,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 381 transitions. [2021-11-25 20:39:34,851 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 381 transitions. Word has length 42 [2021-11-25 20:39:34,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:34,851 INFO L470 AbstractCegarLoop]: Abstraction has 324 states and 381 transitions. [2021-11-25 20:39:34,851 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) [2021-11-25 20:39:34,851 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 381 transitions. [2021-11-25 20:39:34,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 20:39:34,852 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:34,852 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:34,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:35,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:35,053 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:35,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:35,053 INFO L85 PathProgramCache]: Analyzing trace with hash -991411654, now seen corresponding path program 4 times [2021-11-25 20:39:35,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:35,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989755407] [2021-11-25 20:39:35,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:35,054 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:35,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:35,379 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:35,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:35,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989755407] [2021-11-25 20:39:35,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989755407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:35,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15398787] [2021-11-25 20:39:35,379 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:39:35,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:35,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:35,383 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:35,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-25 20:39:35,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:35,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 20:39:35,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:35,778 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 [2021-11-25 20:39:35,830 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:39:35,830 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 17 treesize of output 23 [2021-11-25 20:39:35,840 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 8 treesize of output 3 [2021-11-25 20:39:36,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:39:36,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:36,914 INFO L354 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2021-11-25 20:39:36,914 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 29 treesize of output 18 [2021-11-25 20:39:36,920 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:36,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:37,160 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:39:37,160 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 36 [2021-11-25 20:39:37,182 INFO L354 Elim1Store]: treesize reduction 18, result has 48.6 percent of original size [2021-11-25 20:39:37,182 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 62 treesize of output 61 [2021-11-25 20:39:37,200 INFO L354 Elim1Store]: treesize reduction 10, result has 65.5 percent of original size [2021-11-25 20:39:37,200 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 33 treesize of output 41 [2021-11-25 20:39:37,560 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:37,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15398787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:37,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814774289] [2021-11-25 20:39:37,562 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:39:37,562 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:37,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:37,562 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:37,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:37,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:37,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:37,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:37,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:37,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:39:37,726 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:39:37,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 79 treesize of output 78 [2021-11-25 20:39:37,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:37,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:37,824 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:39:37,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:39:38,456 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:43,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21405#(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 [2021-11-25 20:39:43,617 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:43,617 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:43,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 16] total 39 [2021-11-25 20:39:43,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644770586] [2021-11-25 20:39:43,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:43,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:39:43,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:43,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:39:43,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=2888, Unknown=2, NotChecked=0, Total=3080 [2021-11-25 20:39:43,618 INFO L87 Difference]: Start difference. First operand 324 states and 381 transitions. Second operand has 40 states, 40 states have (on average 2.2) internal successors, (88), 39 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:44,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:44,281 INFO L93 Difference]: Finished difference Result 328 states and 384 transitions. [2021-11-25 20:39:44,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:39:44,283 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.2) internal successors, (88), 39 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 43 [2021-11-25 20:39:44,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:44,284 INFO L225 Difference]: With dead ends: 328 [2021-11-25 20:39:44,284 INFO L226 Difference]: Without dead ends: 325 [2021-11-25 20:39:44,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 976 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=318, Invalid=4372, Unknown=2, NotChecked=0, Total=4692 [2021-11-25 20:39:44,285 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 485 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 207 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:44,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 485 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 388 Invalid, 0 Unknown, 207 Unchecked, 0.2s Time] [2021-11-25 20:39:44,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-11-25 20:39:44,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 324. [2021-11-25 20:39:44,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 320 states have (on average 1.1875) internal successors, (380), 323 states have internal predecessors, (380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:44,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 380 transitions. [2021-11-25 20:39:44,291 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 380 transitions. Word has length 43 [2021-11-25 20:39:44,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:44,292 INFO L470 AbstractCegarLoop]: Abstraction has 324 states and 380 transitions. [2021-11-25 20:39:44,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.2) internal successors, (88), 39 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:44,292 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 380 transitions. [2021-11-25 20:39:44,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:39:44,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:44,293 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] [2021-11-25 20:39:44,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:44,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:44,511 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:44,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:44,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1376230790, now seen corresponding path program 5 times [2021-11-25 20:39:44,511 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:44,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156049108] [2021-11-25 20:39:44,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:44,511 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:44,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:45,251 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 46 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:39:45,251 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:45,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156049108] [2021-11-25 20:39:45,251 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156049108] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:45,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738945631] [2021-11-25 20:39:45,252 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:39:45,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:45,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:45,252 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:45,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-25 20:39:45,404 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:39:45,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:45,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-25 20:39:45,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:45,431 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:39:45,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:39:45,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:39:45,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 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 13 treesize of output 9 [2021-11-25 20:39:45,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:45,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:39:46,358 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:39:46,360 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:39:46,361 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 18 treesize of output 10 [2021-11-25 20:39:46,368 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 39 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 20:39:46,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:46,472 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1422 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1422) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)) is different from false [2021-11-25 20:39:46,478 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:39:46,478 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:39:46,484 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:39:46,484 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 37 treesize of output 37 [2021-11-25 20:39:46,488 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 11 treesize of output 7 [2021-11-25 20:39:46,928 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:39:46,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738945631] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:46,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405638702] [2021-11-25 20:39:46,929 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:39:46,929 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:46,930 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:46,930 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:46,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:46,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:46,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:46,983 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 14 treesize of output 10 [2021-11-25 20:39:47,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:47,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:39:47,104 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:39:47,104 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 79 treesize of output 78 [2021-11-25 20:39:47,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:47,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:47,234 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:39:47,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:39:47,797 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:39:52,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22408#(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 [2021-11-25 20:39:52,713 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:39:52,713 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:39:52,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 14] total 43 [2021-11-25 20:39:52,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427562438] [2021-11-25 20:39:52,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:39:52,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:39:52,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:39:52,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:39:52,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=3110, Unknown=1, NotChecked=112, Total=3422 [2021-11-25 20:39:52,714 INFO L87 Difference]: Start difference. First operand 324 states and 380 transitions. Second operand has 44 states, 44 states have (on average 2.3863636363636362) internal successors, (105), 43 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:54,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:39:54,474 INFO L93 Difference]: Finished difference Result 510 states and 588 transitions. [2021-11-25 20:39:54,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-25 20:39:54,474 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.3863636363636362) internal successors, (105), 43 states have internal predecessors, (105), 0 states have call successors, (0), 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 [2021-11-25 20:39:54,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:39:54,476 INFO L225 Difference]: With dead ends: 510 [2021-11-25 20:39:54,476 INFO L226 Difference]: Without dead ends: 505 [2021-11-25 20:39:54,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 94 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1494 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=406, Invalid=5603, Unknown=1, NotChecked=152, Total=6162 [2021-11-25 20:39:54,478 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 380 mSDsluCounter, 1419 mSDsCounter, 0 mSdLazyCounter, 1242 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 2203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 911 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:39:54,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [380 Valid, 1260 Invalid, 2203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1242 Invalid, 0 Unknown, 911 Unchecked, 0.7s Time] [2021-11-25 20:39:54,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-11-25 20:39:54,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 433. [2021-11-25 20:39:54,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 429 states have (on average 1.1818181818181819) internal successors, (507), 432 states have internal predecessors, (507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:54,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 507 transitions. [2021-11-25 20:39:54,486 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 507 transitions. Word has length 45 [2021-11-25 20:39:54,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:39:54,487 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 507 transitions. [2021-11-25 20:39:54,487 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.3863636363636362) internal successors, (105), 43 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:39:54,487 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 507 transitions. [2021-11-25 20:39:54,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 20:39:54,488 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:39:54,488 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:39:54,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-25 20:39:54,710 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-25 20:39:54,710 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:39:54,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:39:54,711 INFO L85 PathProgramCache]: Analyzing trace with hash -46691458, now seen corresponding path program 6 times [2021-11-25 20:39:54,711 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:39:54,711 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441511402] [2021-11-25 20:39:54,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:39:54,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:39:54,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:39:54,863 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:54,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:39:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441511402] [2021-11-25 20:39:54,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441511402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:39:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1182492424] [2021-11-25 20:39:54,864 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:39:54,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:39:54,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:39:54,867 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:39:54,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-25 20:39:55,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:39:55,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:39:55,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-25 20:39:55,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:39:55,265 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:55,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:39:55,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:39:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:39:55,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1182492424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:39:55,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230971] [2021-11-25 20:39:55,606 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:39:55,606 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:39:55,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:39:55,607 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:39:55,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:39:55,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:39:55,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:39:55,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:55,708 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 14 treesize of output 10 [2021-11-25 20:39:55,745 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 11 treesize of output 7 [2021-11-25 20:39:55,819 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:39:55,819 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 79 treesize of output 78 [2021-11-25 20:39:55,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:55,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:39:55,913 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:39:55,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:39:56,581 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:00,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23692#(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 [2021-11-25 20:40:00,986 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:00,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:00,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-11-25 20:40:00,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790582902] [2021-11-25 20:40:00,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:00,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:40:00,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:00,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:40:00,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1239, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:40:00,992 INFO L87 Difference]: Start difference. First operand 433 states and 507 transitions. Second operand has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 21 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:01,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:01,550 INFO L93 Difference]: Finished difference Result 499 states and 574 transitions. [2021-11-25 20:40:01,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 20:40:01,552 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 21 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 45 [2021-11-25 20:40:01,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:01,554 INFO L225 Difference]: With dead ends: 499 [2021-11-25 20:40:01,554 INFO L226 Difference]: Without dead ends: 483 [2021-11-25 20:40:01,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=318, Invalid=2132, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:40:01,555 INFO L933 BasicCegarLoop]: 56 mSDtfsCounter, 280 mSDsluCounter, 491 mSDsCounter, 0 mSdLazyCounter, 758 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 280 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:01,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [280 Valid, 456 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 758 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:40:01,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-11-25 20:40:01,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 379. [2021-11-25 20:40:01,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 375 states have (on average 1.1813333333333333) internal successors, (443), 378 states have internal predecessors, (443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:01,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 443 transitions. [2021-11-25 20:40:01,563 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 443 transitions. Word has length 45 [2021-11-25 20:40:01,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:01,564 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 443 transitions. [2021-11-25 20:40:01,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 21 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:01,564 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 443 transitions. [2021-11-25 20:40:01,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-25 20:40:01,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:01,565 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] [2021-11-25 20:40:01,595 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:01,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-25 20:40:01,786 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:40:01,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:01,786 INFO L85 PathProgramCache]: Analyzing trace with hash -424954857, now seen corresponding path program 1 times [2021-11-25 20:40:01,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:01,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133781268] [2021-11-25 20:40:01,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:01,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:01,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:01,967 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:40:01,967 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:01,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133781268] [2021-11-25 20:40:01,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133781268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:01,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780270415] [2021-11-25 20:40:01,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:01,968 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:01,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:01,974 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:01,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-25 20:40:02,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:02,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 20:40:02,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:02,380 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:40:02,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:02,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:40:02,656 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 20:40:02,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780270415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:02,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897866608] [2021-11-25 20:40:02,658 INFO L159 IcfgInterpreter]: Started Sifa with 28 locations of interest [2021-11-25 20:40:02,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:02,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:02,659 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:02,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:02,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:02,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:02,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:02,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:02,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:40:02,820 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:40:02,820 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 79 treesize of output 78 [2021-11-25 20:40:02,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:02,899 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 14 treesize of output 10 [2021-11-25 20:40:02,937 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:40:02,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:03,937 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:10,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24907#(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_main_#t~malloc23#1.offset| 0) (= |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|) (<= |#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) (< (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_~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|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |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|) (<= 1 |ULTIMATE.start_cstrncmp_#t~pre8#1.offset|) (= |#NULL.base| 0))' at error location [2021-11-25 20:40:10,877 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:10,877 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:10,877 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 26 [2021-11-25 20:40:10,877 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612374468] [2021-11-25 20:40:10,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:10,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-25 20:40:10,877 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:10,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-25 20:40:10,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=2280, Unknown=0, NotChecked=0, Total=2550 [2021-11-25 20:40:10,878 INFO L87 Difference]: Start difference. First operand 379 states and 443 transitions. Second operand has 27 states, 26 states have (on average 3.230769230769231) internal successors, (84), 27 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:12,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:12,015 INFO L93 Difference]: Finished difference Result 813 states and 943 transitions. [2021-11-25 20:40:12,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:40:12,015 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.230769230769231) internal successors, (84), 27 states have internal predecessors, (84), 0 states have call successors, (0), 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 [2021-11-25 20:40:12,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:12,018 INFO L225 Difference]: With dead ends: 813 [2021-11-25 20:40:12,018 INFO L226 Difference]: Without dead ends: 807 [2021-11-25 20:40:12,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=780, Invalid=4476, Unknown=0, NotChecked=0, Total=5256 [2021-11-25 20:40:12,018 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 829 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 829 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:12,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [829 Valid, 400 Invalid, 760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 641 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:40:12,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2021-11-25 20:40:12,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 589. [2021-11-25 20:40:12,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 589 states, 585 states have (on average 1.2068376068376068) internal successors, (706), 588 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:12,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 589 states to 589 states and 706 transitions. [2021-11-25 20:40:12,031 INFO L78 Accepts]: Start accepts. Automaton has 589 states and 706 transitions. Word has length 46 [2021-11-25 20:40:12,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:12,032 INFO L470 AbstractCegarLoop]: Abstraction has 589 states and 706 transitions. [2021-11-25 20:40:12,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.230769230769231) internal successors, (84), 27 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:12,032 INFO L276 IsEmpty]: Start isEmpty. Operand 589 states and 706 transitions. [2021-11-25 20:40:12,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-25 20:40:12,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:12,033 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] [2021-11-25 20:40:12,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:12,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:12,246 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:40:12,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:12,247 INFO L85 PathProgramCache]: Analyzing trace with hash -1280727606, now seen corresponding path program 7 times [2021-11-25 20:40:12,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:12,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225500062] [2021-11-25 20:40:12,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:12,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:12,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:12,422 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 12 proven. 45 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:12,422 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:12,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225500062] [2021-11-25 20:40:12,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [225500062] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:12,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039850756] [2021-11-25 20:40:12,423 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:40:12,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:12,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:12,427 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:12,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-25 20:40:12,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:12,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-25 20:40:12,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:12,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:12,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:12,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:40:13,222 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 16 proven. 41 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:13,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:13,761 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 25 proven. 32 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:13,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039850756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:13,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [930171333] [2021-11-25 20:40:13,762 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:40:13,763 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:13,763 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:13,763 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:13,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:13,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:13,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:13,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:13,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:13,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:40:13,916 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:40:13,916 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 79 treesize of output 78 [2021-11-25 20:40:13,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:13,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:14,025 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:40:14,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:14,734 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:19,745 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26694#(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 [2021-11-25 20:40:19,746 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:19,746 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:19,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2021-11-25 20:40:19,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066578212] [2021-11-25 20:40:19,746 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:19,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 20:40:19,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:19,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 20:40:19,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=2907, Unknown=0, NotChecked=0, Total=3192 [2021-11-25 20:40:19,747 INFO L87 Difference]: Start difference. First operand 589 states and 706 transitions. Second operand has 41 states, 40 states have (on average 3.15) internal successors, (126), 40 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) [2021-11-25 20:40:20,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:20,886 INFO L93 Difference]: Finished difference Result 1120 states and 1364 transitions. [2021-11-25 20:40:20,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-25 20:40:20,887 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 3.15) internal successors, (126), 40 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 47 [2021-11-25 20:40:20,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:20,891 INFO L225 Difference]: With dead ends: 1120 [2021-11-25 20:40:20,891 INFO L226 Difference]: Without dead ends: 1120 [2021-11-25 20:40:20,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1300 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=688, Invalid=4714, Unknown=0, NotChecked=0, Total=5402 [2021-11-25 20:40:20,892 INFO L933 BasicCegarLoop]: 75 mSDtfsCounter, 625 mSDsluCounter, 1111 mSDsCounter, 0 mSdLazyCounter, 1617 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 625 SdHoareTripleChecker+Valid, 988 SdHoareTripleChecker+Invalid, 1632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:20,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [625 Valid, 988 Invalid, 1632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1617 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:40:20,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1120 states. [2021-11-25 20:40:20,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1120 to 815. [2021-11-25 20:40:20,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 815 states, 811 states have (on average 1.218249075215783) internal successors, (988), 814 states have internal predecessors, (988), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:20,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 815 states to 815 states and 988 transitions. [2021-11-25 20:40:20,908 INFO L78 Accepts]: Start accepts. Automaton has 815 states and 988 transitions. Word has length 47 [2021-11-25 20:40:20,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:20,908 INFO L470 AbstractCegarLoop]: Abstraction has 815 states and 988 transitions. [2021-11-25 20:40:20,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 3.15) internal successors, (126), 40 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) [2021-11-25 20:40:20,908 INFO L276 IsEmpty]: Start isEmpty. Operand 815 states and 988 transitions. [2021-11-25 20:40:20,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 20:40:20,910 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:20,910 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] [2021-11-25 20:40:20,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:21,134 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:21,134 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:40:21,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:21,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1047890674, now seen corresponding path program 2 times [2021-11-25 20:40:21,135 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:21,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194365880] [2021-11-25 20:40:21,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:21,135 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:21,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:21,361 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:21,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:21,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194365880] [2021-11-25 20:40:21,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194365880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:21,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984990777] [2021-11-25 20:40:21,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:40:21,361 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:21,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:21,363 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:21,386 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-25 20:40:21,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:40:21,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:21,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-25 20:40:21,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:21,581 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:40:21,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:40:21,870 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 13 treesize of output 9 [2021-11-25 20:40:21,934 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-25 20:40:21,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:22,916 INFO L354 Elim1Store]: treesize reduction 8, result has 78.4 percent of original size [2021-11-25 20:40:22,916 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 29 treesize of output 39 [2021-11-25 20:40:23,064 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:40:23,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:24,201 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:40:24,201 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 101 treesize of output 101 [2021-11-25 20:40:25,409 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-25 20:40:25,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984990777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:25,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064144652] [2021-11-25 20:40:25,410 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 20:40:25,410 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:25,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:25,410 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:25,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:25,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:25,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:25,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:40:25,498 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 14 treesize of output 10 [2021-11-25 20:40:25,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:25,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:25,563 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 83 treesize of output 75 [2021-11-25 20:40:25,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:25,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:25,647 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:40:25,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:26,352 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:31,567 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28997#(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 [2021-11-25 20:40:31,568 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:31,568 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:31,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 10] total 34 [2021-11-25 20:40:31,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589689603] [2021-11-25 20:40:31,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:31,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:40:31,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:31,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:40:31,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=2681, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:40:31,569 INFO L87 Difference]: Start difference. First operand 815 states and 988 transitions. Second operand has 36 states, 35 states have (on average 3.0) internal successors, (105), 35 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:32,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:32,968 INFO L93 Difference]: Finished difference Result 984 states and 1172 transitions. [2021-11-25 20:40:32,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-25 20:40:32,969 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.0) internal successors, (105), 35 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-25 20:40:32,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:32,972 INFO L225 Difference]: With dead ends: 984 [2021-11-25 20:40:32,972 INFO L226 Difference]: Without dead ends: 984 [2021-11-25 20:40:32,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=687, Invalid=6453, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:40:32,973 INFO L933 BasicCegarLoop]: 41 mSDtfsCounter, 100 mSDsluCounter, 620 mSDsCounter, 0 mSdLazyCounter, 742 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 643 SdHoareTripleChecker+Invalid, 1232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 487 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:32,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 643 Invalid, 1232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 742 Invalid, 0 Unknown, 487 Unchecked, 0.3s Time] [2021-11-25 20:40:32,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2021-11-25 20:40:32,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 826. [2021-11-25 20:40:32,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 826 states, 822 states have (on average 1.2153284671532847) internal successors, (999), 825 states have internal predecessors, (999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:32,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 826 states to 826 states and 999 transitions. [2021-11-25 20:40:32,987 INFO L78 Accepts]: Start accepts. Automaton has 826 states and 999 transitions. Word has length 48 [2021-11-25 20:40:32,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:32,987 INFO L470 AbstractCegarLoop]: Abstraction has 826 states and 999 transitions. [2021-11-25 20:40:32,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.0) internal successors, (105), 35 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:32,988 INFO L276 IsEmpty]: Start isEmpty. Operand 826 states and 999 transitions. [2021-11-25 20:40:32,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 20:40:32,989 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:32,989 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] [2021-11-25 20:40:33,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:33,210 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:33,210 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:40:33,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:33,211 INFO L85 PathProgramCache]: Analyzing trace with hash -351811556, now seen corresponding path program 3 times [2021-11-25 20:40:33,211 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:33,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286463618] [2021-11-25 20:40:33,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:33,211 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:33,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:33,371 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:40:33,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:33,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286463618] [2021-11-25 20:40:33,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286463618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:33,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026312424] [2021-11-25 20:40:33,372 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:40:33,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:33,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:33,373 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:33,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-25 20:40:33,592 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:40:33,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:33,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-25 20:40:33,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:33,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:33,917 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-25 20:40:33,917 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 24 treesize of output 23 [2021-11-25 20:40:34,813 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 5 proven. 18 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:40:34,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:37,348 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))) (let ((.cse1 (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| 2)))) (or (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)) .cse1)) (= .cse1 0))))) is different from false [2021-11-25 20:40:37,365 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-25 20:40:37,366 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 246 treesize of output 211 [2021-11-25 20:40:37,375 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:40:37,375 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 153 treesize of output 147 [2021-11-25 20:40:37,444 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 40 treesize of output 36 [2021-11-25 20:40:37,453 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-25 20:40:37,453 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 [2021-11-25 20:40:37,712 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 7 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 20:40:37,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1026312424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:37,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521091245] [2021-11-25 20:40:37,713 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:40:37,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:37,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:37,713 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:37,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:37,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:37,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:37,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:40:37,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:37,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:40:37,892 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:40:37,892 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 79 treesize of output 78 [2021-11-25 20:40:37,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:37,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:38,016 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:40:38,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:39,153 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:45,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31221#(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 [2021-11-25 20:40:45,975 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:45,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:45,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 19, 20] total 46 [2021-11-25 20:40:45,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797924965] [2021-11-25 20:40:45,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:45,976 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:40:45,976 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:45,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:40:45,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=4181, Unknown=1, NotChecked=130, Total=4556 [2021-11-25 20:40:45,977 INFO L87 Difference]: Start difference. First operand 826 states and 999 transitions. Second operand has 46 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 46 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:48,169 WARN L838 $PredicateComparison]: unable to prove that (and (< 2 |c_ULTIMATE.start_main_~length1~0#1|) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 3) (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))) (let ((.cse1 (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| 2)))) (or (not (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)) .cse1)) (= .cse1 0))))) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 2 |ULTIMATE.start_main_~length1~0#1|) (= (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| 3))) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~length1~0#1| 3)) is different from false [2021-11-25 20:40:48,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:48,879 INFO L93 Difference]: Finished difference Result 1047 states and 1243 transitions. [2021-11-25 20:40:48,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 20:40:48,883 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 46 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-25 20:40:48,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:48,888 INFO L225 Difference]: With dead ends: 1047 [2021-11-25 20:40:48,888 INFO L226 Difference]: Without dead ends: 1019 [2021-11-25 20:40:48,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1473 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=369, Invalid=6609, Unknown=2, NotChecked=330, Total=7310 [2021-11-25 20:40:48,889 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 45 mSDsluCounter, 804 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 768 SdHoareTripleChecker+Invalid, 671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 235 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:48,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 768 Invalid, 671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 429 Invalid, 0 Unknown, 235 Unchecked, 0.2s Time] [2021-11-25 20:40:48,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2021-11-25 20:40:48,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 956. [2021-11-25 20:40:48,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 956 states, 952 states have (on average 1.2100840336134453) internal successors, (1152), 955 states have internal predecessors, (1152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:48,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 956 states to 956 states and 1152 transitions. [2021-11-25 20:40:48,904 INFO L78 Accepts]: Start accepts. Automaton has 956 states and 1152 transitions. Word has length 48 [2021-11-25 20:40:48,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:48,904 INFO L470 AbstractCegarLoop]: Abstraction has 956 states and 1152 transitions. [2021-11-25 20:40:48,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.5869565217391304) internal successors, (119), 46 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:48,904 INFO L276 IsEmpty]: Start isEmpty. Operand 956 states and 1152 transitions. [2021-11-25 20:40:48,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 20:40:48,906 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:48,906 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] [2021-11-25 20:40:48,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:49,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:49,125 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:40:49,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:49,126 INFO L85 PathProgramCache]: Analyzing trace with hash 1577702487, now seen corresponding path program 1 times [2021-11-25 20:40:49,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:49,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061281166] [2021-11-25 20:40:49,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:49,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:49,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:49,416 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:49,416 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:49,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061281166] [2021-11-25 20:40:49,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061281166] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:49,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834019591] [2021-11-25 20:40:49,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:49,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:49,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:49,418 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:49,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-25 20:40:49,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:49,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 20:40:49,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:49,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:40:49,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-25 20:40:49,757 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 16 treesize of output 18 [2021-11-25 20:40:49,829 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 [2021-11-25 20:40:49,836 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:49,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:49,914 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1724 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1724) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) 0)) is different from false [2021-11-25 20:40:49,920 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:40:49,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:40:49,926 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:40:49,927 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 37 treesize of output 37 [2021-11-25 20:40:49,930 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 11 treesize of output 7 [2021-11-25 20:40:50,071 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 8 proven. 20 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:50,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834019591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:50,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678870866] [2021-11-25 20:40:50,072 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:40:50,072 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:50,072 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:50,072 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:50,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:50,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:50,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:50,148 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 11 treesize of output 7 [2021-11-25 20:40:50,179 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 14 treesize of output 10 [2021-11-25 20:40:50,208 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 11 treesize of output 7 [2021-11-25 20:40:50,264 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:40:50,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 79 treesize of output 78 [2021-11-25 20:40:50,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:50,371 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 14 treesize of output 10 [2021-11-25 20:40:50,421 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:40:50,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:51,483 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:40:56,738 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33597#(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 [2021-11-25 20:40:56,738 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:40:56,738 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:40:56,739 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 19 [2021-11-25 20:40:56,739 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075710862] [2021-11-25 20:40:56,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:40:56,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 20:40:56,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:40:56,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 20:40:56,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1534, Unknown=1, NotChecked=80, Total=1806 [2021-11-25 20:40:56,740 INFO L87 Difference]: Start difference. First operand 956 states and 1152 transitions. Second operand has 20 states, 20 states have (on average 2.7) internal successors, (54), 19 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:57,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:40:57,035 INFO L93 Difference]: Finished difference Result 1058 states and 1269 transitions. [2021-11-25 20:40:57,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 20:40:57,035 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 19 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-25 20:40:57,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:40:57,038 INFO L225 Difference]: With dead ends: 1058 [2021-11-25 20:40:57,038 INFO L226 Difference]: Without dead ends: 1012 [2021-11-25 20:40:57,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=219, Invalid=1946, Unknown=1, NotChecked=90, Total=2256 [2021-11-25 20:40:57,039 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 48 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 438 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:40:57,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 365 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 438 Invalid, 0 Unknown, 79 Unchecked, 0.2s Time] [2021-11-25 20:40:57,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1012 states. [2021-11-25 20:40:57,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1012 to 929. [2021-11-25 20:40:57,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 925 states have (on average 1.211891891891892) internal successors, (1121), 928 states have internal predecessors, (1121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:57,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1121 transitions. [2021-11-25 20:40:57,053 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1121 transitions. Word has length 49 [2021-11-25 20:40:57,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:40:57,053 INFO L470 AbstractCegarLoop]: Abstraction has 929 states and 1121 transitions. [2021-11-25 20:40:57,053 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 19 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:40:57,054 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1121 transitions. [2021-11-25 20:40:57,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-25 20:40:57,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:40:57,055 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:40:57,106 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-25 20:40:57,269 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-11-25 20:40:57,269 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:40:57,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:40:57,270 INFO L85 PathProgramCache]: Analyzing trace with hash -589889582, now seen corresponding path program 8 times [2021-11-25 20:40:57,270 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:40:57,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237058155] [2021-11-25 20:40:57,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:40:57,270 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:40:57,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:40:57,673 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 14 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:57,673 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:40:57,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237058155] [2021-11-25 20:40:57,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237058155] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:40:57,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756845826] [2021-11-25 20:40:57,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:40:57,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:40:57,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:40:57,674 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:40:57,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 20:40:57,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:40:57,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:40:57,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-25 20:40:57,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:40:57,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:40:58,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:58,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:40:58,490 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 [2021-11-25 20:40:58,497 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 14 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:58,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:40:58,595 WARN L838 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1778 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1778) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 4)) 0)) is different from false [2021-11-25 20:40:58,601 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:40:58,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:40:58,608 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:40:58,608 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 37 treesize of output 37 [2021-11-25 20:40:58,611 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 11 treesize of output 7 [2021-11-25 20:40:58,826 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 14 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:40:58,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756845826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:40:58,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734022847] [2021-11-25 20:40:58,827 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:40:58,827 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:40:58,827 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:40:58,827 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:40:58,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:40:58,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:58,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:40:58,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:40:58,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:58,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:58,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:40:58,980 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 83 treesize of output 75 [2021-11-25 20:40:59,012 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 14 treesize of output 10 [2021-11-25 20:40:59,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:40:59,063 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:40:59,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:40:59,691 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:04,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35950#(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 [2021-11-25 20:41:04,513 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:04,514 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:04,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 32 [2021-11-25 20:41:04,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076019144] [2021-11-25 20:41:04,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:04,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-25 20:41:04,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:04,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-25 20:41:04,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2093, Unknown=1, NotChecked=92, Total=2352 [2021-11-25 20:41:04,515 INFO L87 Difference]: Start difference. First operand 929 states and 1121 transitions. Second operand has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 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) [2021-11-25 20:41:05,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:05,682 INFO L93 Difference]: Finished difference Result 1577 states and 1890 transitions. [2021-11-25 20:41:05,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:41:05,683 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 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 51 [2021-11-25 20:41:05,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:05,688 INFO L225 Difference]: With dead ends: 1577 [2021-11-25 20:41:05,688 INFO L226 Difference]: Without dead ends: 1531 [2021-11-25 20:41:05,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=243, Invalid=3182, Unknown=1, NotChecked=114, Total=3540 [2021-11-25 20:41:05,689 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 271 mSDsluCounter, 2244 mSDsCounter, 0 mSdLazyCounter, 1744 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 1945 SdHoareTripleChecker+Invalid, 2034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1744 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:05,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 1945 Invalid, 2034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1744 Invalid, 0 Unknown, 276 Unchecked, 0.8s Time] [2021-11-25 20:41:05,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1531 states. [2021-11-25 20:41:05,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1531 to 1265. [2021-11-25 20:41:05,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1265 states, 1261 states have (on average 1.212529738302934) internal successors, (1529), 1264 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:41:05,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1265 states to 1265 states and 1529 transitions. [2021-11-25 20:41:05,708 INFO L78 Accepts]: Start accepts. Automaton has 1265 states and 1529 transitions. Word has length 51 [2021-11-25 20:41:05,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:05,709 INFO L470 AbstractCegarLoop]: Abstraction has 1265 states and 1529 transitions. [2021-11-25 20:41:05,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.5757575757575757) internal successors, (85), 32 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) [2021-11-25 20:41:05,709 INFO L276 IsEmpty]: Start isEmpty. Operand 1265 states and 1529 transitions. [2021-11-25 20:41:05,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 20:41:05,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:05,712 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] [2021-11-25 20:41:05,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:05,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:05,938 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:41:05,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:05,939 INFO L85 PathProgramCache]: Analyzing trace with hash -1314665167, now seen corresponding path program 1 times [2021-11-25 20:41:05,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:05,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464797802] [2021-11-25 20:41:05,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:05,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:05,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:06,219 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 28 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:41:06,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:06,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464797802] [2021-11-25 20:41:06,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464797802] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:06,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698003307] [2021-11-25 20:41:06,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:06,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:06,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:06,220 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:06,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-25 20:41:06,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:06,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 133 conjunts are in the unsatisfiable core [2021-11-25 20:41:06,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:06,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:06,876 INFO L354 Elim1Store]: treesize reduction 28, result has 41.7 percent of original size [2021-11-25 20:41:06,876 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 24 treesize of output 33 [2021-11-25 20:41:08,090 INFO L354 Elim1Store]: treesize reduction 53, result has 19.7 percent of original size [2021-11-25 20:41:08,091 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 40 treesize of output 29 [2021-11-25 20:41:08,135 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:41:08,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:08,850 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-25 20:41:08,851 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 446 treesize of output 350 [2021-11-25 20:41:08,863 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:41:08,864 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 350 treesize of output 334 [2021-11-25 20:41:09,005 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-25 20:41:09,005 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 [2021-11-25 20:41:09,033 INFO L354 Elim1Store]: treesize reduction 20, result has 51.2 percent of original size [2021-11-25 20:41:09,033 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 104 treesize of output 106 [2021-11-25 20:41:09,898 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 1 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:41:09,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698003307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:09,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [974942122] [2021-11-25 20:41:09,899 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:41:09,899 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:09,900 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:09,900 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:09,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:09,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:09,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:41:09,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:41:09,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:10,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:41:10,067 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:41:10,067 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 79 treesize of output 78 [2021-11-25 20:41:10,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:10,131 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 14 treesize of output 10 [2021-11-25 20:41:10,159 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:41:10,160 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 25 treesize of output 24 [2021-11-25 20:41:11,510 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:41:19,586 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39208#(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 [2021-11-25 20:41:19,586 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:41:19,586 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:41:19,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 28, 28] total 71 [2021-11-25 20:41:19,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947221635] [2021-11-25 20:41:19,586 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:41:19,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-25 20:41:19,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:41:19,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-25 20:41:19,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=8742, Unknown=0, NotChecked=0, Total=9120 [2021-11-25 20:41:19,588 INFO L87 Difference]: Start difference. First operand 1265 states and 1529 transitions. Second operand has 72 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 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) [2021-11-25 20:41:25,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:41:25,682 INFO L93 Difference]: Finished difference Result 1763 states and 2068 transitions. [2021-11-25 20:41:25,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-25 20:41:25,682 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 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 52 [2021-11-25 20:41:25,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:41:25,687 INFO L225 Difference]: With dead ends: 1763 [2021-11-25 20:41:25,687 INFO L226 Difference]: Without dead ends: 1668 [2021-11-25 20:41:25,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8258 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=1348, Invalid=29452, Unknown=0, NotChecked=0, Total=30800 [2021-11-25 20:41:25,689 INFO L933 BasicCegarLoop]: 139 mSDtfsCounter, 1031 mSDsluCounter, 5291 mSDsCounter, 0 mSdLazyCounter, 4883 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1031 SdHoareTripleChecker+Valid, 4998 SdHoareTripleChecker+Invalid, 6126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 4883 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1109 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:41:25,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1031 Valid, 4998 Invalid, 6126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 4883 Invalid, 0 Unknown, 1109 Unchecked, 2.0s Time] [2021-11-25 20:41:25,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1668 states. [2021-11-25 20:41:25,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1668 to 1262. [2021-11-25 20:41:25,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1262 states, 1258 states have (on average 1.2098569157392687) internal successors, (1522), 1261 states have internal predecessors, (1522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:41:25,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1262 states to 1262 states and 1522 transitions. [2021-11-25 20:41:25,709 INFO L78 Accepts]: Start accepts. Automaton has 1262 states and 1522 transitions. Word has length 52 [2021-11-25 20:41:25,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:41:25,709 INFO L470 AbstractCegarLoop]: Abstraction has 1262 states and 1522 transitions. [2021-11-25 20:41:25,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.9583333333333333) internal successors, (141), 71 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) [2021-11-25 20:41:25,709 INFO L276 IsEmpty]: Start isEmpty. Operand 1262 states and 1522 transitions. [2021-11-25 20:41:25,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 20:41:25,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:41:25,712 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] [2021-11-25 20:41:25,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-25 20:41:25,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-25 20:41:25,926 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:41:25,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:41:25,927 INFO L85 PathProgramCache]: Analyzing trace with hash -427628864, now seen corresponding path program 1 times [2021-11-25 20:41:25,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:41:25,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138555582] [2021-11-25 20:41:25,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:25,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:41:25,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:26,035 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 20:41:26,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:41:26,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138555582] [2021-11-25 20:41:26,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138555582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:41:26,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291820001] [2021-11-25 20:41:26,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:41:26,036 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:41:26,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:41:26,039 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:41:26,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-25 20:41:26,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:41:26,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-25 20:41:26,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:41:26,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:26,580 INFO L354 Elim1Store]: treesize reduction 27, result has 46.0 percent of original size [2021-11-25 20:41:26,581 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 37 [2021-11-25 20:41:27,714 INFO L354 Elim1Store]: treesize reduction 67, result has 16.3 percent of original size [2021-11-25 20:41:27,714 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 42 treesize of output 29 [2021-11-25 20:41:27,750 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:41:27,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:41:46,909 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-25 20:41:46,909 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 244 treesize of output 198 [2021-11-25 20:41:46,916 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:41:46,916 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 198 treesize of output 190 [2021-11-25 20:41:46,995 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-25 20:41:46,996 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 [2021-11-25 20:41:47,024 INFO L354 Elim1Store]: treesize reduction 20, result has 51.2 percent of original size [2021-11-25 20:41:47,024 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 104 treesize of output 106 [2021-11-25 20:41:47,428 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:41:47,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291820001] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:41:47,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845249632] [2021-11-25 20:41:47,429 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-25 20:41:47,429 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:41:47,429 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:41:47,430 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:41:47,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:41:47,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:41:47,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:41:47,486 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 14 treesize of output 10 [2021-11-25 20:41:47,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:47,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:41:47,578 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:41:47,579 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 79 treesize of output 78 [2021-11-25 20:41:47,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:47,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:41:47,677 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:41:47,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:41:52,166 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:02,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42773#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (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_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |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_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_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#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|))) (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) (<= 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_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_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_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 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|) (<= 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) (<= 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|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))))' at error location [2021-11-25 20:42:02,256 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:02,256 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:02,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 25, 24] total 48 [2021-11-25 20:42:02,256 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855096856] [2021-11-25 20:42:02,256 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:02,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 20:42:02,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:02,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 20:42:02,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=5382, Unknown=14, NotChecked=0, Total=5700 [2021-11-25 20:42:02,257 INFO L87 Difference]: Start difference. First operand 1262 states and 1522 transitions. Second operand has 48 states, 48 states have (on average 2.6875) internal successors, (129), 48 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:03,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:03,514 INFO L93 Difference]: Finished difference Result 1380 states and 1597 transitions. [2021-11-25 20:42:03,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 20:42:03,515 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.6875) internal successors, (129), 48 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 [2021-11-25 20:42:03,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:03,519 INFO L225 Difference]: With dead ends: 1380 [2021-11-25 20:42:03,519 INFO L226 Difference]: Without dead ends: 1272 [2021-11-25 20:42:03,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 86 SyntacticMatches, 7 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3012 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=522, Invalid=9970, Unknown=14, NotChecked=0, Total=10506 [2021-11-25 20:42:03,520 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 50 mSDsluCounter, 611 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 581 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:03,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 581 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 479 Invalid, 0 Unknown, 174 Unchecked, 0.2s Time] [2021-11-25 20:42:03,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2021-11-25 20:42:03,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 1030. [2021-11-25 20:42:03,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1030 states, 1026 states have (on average 1.1968810916179338) internal successors, (1228), 1029 states have internal predecessors, (1228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:03,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1030 states to 1030 states and 1228 transitions. [2021-11-25 20:42:03,534 INFO L78 Accepts]: Start accepts. Automaton has 1030 states and 1228 transitions. Word has length 52 [2021-11-25 20:42:03,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:03,534 INFO L470 AbstractCegarLoop]: Abstraction has 1030 states and 1228 transitions. [2021-11-25 20:42:03,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.6875) internal successors, (129), 48 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:03,534 INFO L276 IsEmpty]: Start isEmpty. Operand 1030 states and 1228 transitions. [2021-11-25 20:42:03,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-25 20:42:03,536 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:03,536 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:03,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:03,750 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:03,750 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:42:03,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:03,751 INFO L85 PathProgramCache]: Analyzing trace with hash 1006290198, now seen corresponding path program 9 times [2021-11-25 20:42:03,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:03,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308468405] [2021-11-25 20:42:03,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:03,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:03,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:03,952 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 20 proven. 66 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:42:03,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:03,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308468405] [2021-11-25 20:42:03,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308468405] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:03,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198550466] [2021-11-25 20:42:03,953 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:42:03,953 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:03,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:03,954 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:03,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-25 20:42:04,228 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:42:04,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:04,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 20:42:04,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:04,429 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:42:04,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:04,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-25 20:42:04,778 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 61 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:42:04,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1198550466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:04,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848420447] [2021-11-25 20:42:04,779 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2021-11-25 20:42:04,780 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:04,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:04,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:04,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:04,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:04,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:04,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:04,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:04,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:04,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:04,919 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 83 treesize of output 75 [2021-11-25 20:42:04,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:04,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:05,003 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:42:05,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:42:05,650 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:10,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45611#(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 [2021-11-25 20:42:10,391 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:10,391 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:10,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 27 [2021-11-25 20:42:10,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451899267] [2021-11-25 20:42:10,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:10,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:42:10,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:10,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:42:10,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1781, Unknown=0, NotChecked=0, Total=1980 [2021-11-25 20:42:10,392 INFO L87 Difference]: Start difference. First operand 1030 states and 1228 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) [2021-11-25 20:42:11,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:11,539 INFO L93 Difference]: Finished difference Result 1236 states and 1450 transitions. [2021-11-25 20:42:11,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:42:11,540 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 53 [2021-11-25 20:42:11,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:11,544 INFO L225 Difference]: With dead ends: 1236 [2021-11-25 20:42:11,544 INFO L226 Difference]: Without dead ends: 1236 [2021-11-25 20:42:11,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=519, Invalid=3513, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:42:11,545 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 755 mSDsluCounter, 1270 mSDsCounter, 0 mSdLazyCounter, 1681 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 755 SdHoareTripleChecker+Valid, 1113 SdHoareTripleChecker+Invalid, 1703 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:11,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [755 Valid, 1113 Invalid, 1703 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1681 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:42:11,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1236 states. [2021-11-25 20:42:11,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1236 to 1107. [2021-11-25 20:42:11,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1107 states, 1103 states have (on average 1.200362647325476) internal successors, (1324), 1106 states have internal predecessors, (1324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:11,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1107 states to 1107 states and 1324 transitions. [2021-11-25 20:42:11,569 INFO L78 Accepts]: Start accepts. Automaton has 1107 states and 1324 transitions. Word has length 53 [2021-11-25 20:42:11,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:11,569 INFO L470 AbstractCegarLoop]: Abstraction has 1107 states and 1324 transitions. [2021-11-25 20:42:11,569 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) [2021-11-25 20:42:11,569 INFO L276 IsEmpty]: Start isEmpty. Operand 1107 states and 1324 transitions. [2021-11-25 20:42:11,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 20:42:11,570 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:11,570 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] [2021-11-25 20:42:11,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:11,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:11,794 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:42:11,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:11,795 INFO L85 PathProgramCache]: Analyzing trace with hash 922267757, now seen corresponding path program 2 times [2021-11-25 20:42:11,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:11,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812974413] [2021-11-25 20:42:11,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:11,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:11,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:11,976 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 26 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:42:11,976 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:11,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812974413] [2021-11-25 20:42:11,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812974413] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:11,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379585196] [2021-11-25 20:42:11,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:42:11,977 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:11,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:11,978 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:11,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-25 20:42:12,155 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:42:12,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:12,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 20:42:12,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:12,169 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 [2021-11-25 20:42:12,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:12,353 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 [2021-11-25 20:42:12,380 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 18 treesize of output 20 [2021-11-25 20:42:12,827 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:12,827 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 1 case distinctions, treesize of input 34 treesize of output 26 [2021-11-25 20:42:12,941 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 20:42:12,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:13,998 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:13,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2021-11-25 20:42:14,007 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:14,007 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 44 treesize of output 44 [2021-11-25 20:42:14,018 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:14,018 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 36 treesize of output 32 [2021-11-25 20:42:14,403 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 20:42:14,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379585196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:14,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1288049021] [2021-11-25 20:42:14,408 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:42:14,408 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:14,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:14,409 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:14,409 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:14,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:14,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:14,470 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 11 treesize of output 7 [2021-11-25 20:42:14,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:14,536 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 14 treesize of output 10 [2021-11-25 20:42:14,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:14,577 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 83 treesize of output 75 [2021-11-25 20:42:14,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:14,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:14,662 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:42:14,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:42:15,984 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:23,062 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48367#(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 [2021-11-25 20:42:23,062 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:23,062 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:23,063 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2021-11-25 20:42:23,063 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186967124] [2021-11-25 20:42:23,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:23,063 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 20:42:23,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:23,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 20:42:23,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=3867, Unknown=12, NotChecked=0, Total=4160 [2021-11-25 20:42:23,064 INFO L87 Difference]: Start difference. First operand 1107 states and 1324 transitions. Second operand has 41 states, 40 states have (on average 2.875) internal successors, (115), 40 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) [2021-11-25 20:42:29,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:29,666 INFO L93 Difference]: Finished difference Result 1472 states and 1701 transitions. [2021-11-25 20:42:29,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-25 20:42:29,667 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 2.875) internal successors, (115), 40 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 [2021-11-25 20:42:29,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:29,671 INFO L225 Difference]: With dead ends: 1472 [2021-11-25 20:42:29,672 INFO L226 Difference]: Without dead ends: 1459 [2021-11-25 20:42:29,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6354 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=3291, Invalid=20566, Unknown=13, NotChecked=0, Total=23870 [2021-11-25 20:42:29,673 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 713 mSDsluCounter, 1402 mSDsCounter, 0 mSdLazyCounter, 2466 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 713 SdHoareTripleChecker+Valid, 1243 SdHoareTripleChecker+Invalid, 2925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 2466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 291 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:29,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [713 Valid, 1243 Invalid, 2925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 2466 Invalid, 0 Unknown, 291 Unchecked, 1.3s Time] [2021-11-25 20:42:29,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1459 states. [2021-11-25 20:42:29,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1459 to 1054. [2021-11-25 20:42:29,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1054 states, 1050 states have (on average 1.1933333333333334) internal successors, (1253), 1053 states have internal predecessors, (1253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:29,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1054 states to 1054 states and 1253 transitions. [2021-11-25 20:42:29,685 INFO L78 Accepts]: Start accepts. Automaton has 1054 states and 1253 transitions. Word has length 54 [2021-11-25 20:42:29,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:29,685 INFO L470 AbstractCegarLoop]: Abstraction has 1054 states and 1253 transitions. [2021-11-25 20:42:29,685 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 2.875) internal successors, (115), 40 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) [2021-11-25 20:42:29,685 INFO L276 IsEmpty]: Start isEmpty. Operand 1054 states and 1253 transitions. [2021-11-25 20:42:29,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 20:42:29,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:29,686 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:29,708 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-25 20:42:29,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-25 20:42:29,887 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:42:29,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:29,887 INFO L85 PathProgramCache]: Analyzing trace with hash -443912104, now seen corresponding path program 4 times [2021-11-25 20:42:29,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:29,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3827411] [2021-11-25 20:42:29,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:29,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:29,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:30,052 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:42:30,052 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:30,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3827411] [2021-11-25 20:42:30,052 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3827411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:30,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [924845787] [2021-11-25 20:42:30,052 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:42:30,052 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:30,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:30,053 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:30,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-25 20:42:30,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:30,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-25 20:42:30,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:30,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:30,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:30,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:42:30,809 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:42:30,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:31,333 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:42:31,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [924845787] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:31,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [488639887] [2021-11-25 20:42:31,334 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:42:31,334 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:31,334 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:31,334 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:31,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:31,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:31,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:31,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:31,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:31,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:42:31,482 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:42:31,482 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 79 treesize of output 78 [2021-11-25 20:42:31,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:31,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:31,576 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:42:31,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:42:32,807 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:40,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51471#(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 [2021-11-25 20:42:40,505 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:40,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:40,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2021-11-25 20:42:40,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770878636] [2021-11-25 20:42:40,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:40,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:42:40,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:40,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:42:40,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=3031, Unknown=0, NotChecked=0, Total=3306 [2021-11-25 20:42:40,506 INFO L87 Difference]: Start difference. First operand 1054 states and 1253 transitions. Second operand has 35 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 34 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:41,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:41,236 INFO L93 Difference]: Finished difference Result 1341 states and 1568 transitions. [2021-11-25 20:42:41,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-25 20:42:41,237 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 34 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-25 20:42:41,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:41,241 INFO L225 Difference]: With dead ends: 1341 [2021-11-25 20:42:41,241 INFO L226 Difference]: Without dead ends: 1341 [2021-11-25 20:42:41,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=599, Invalid=4657, Unknown=0, NotChecked=0, Total=5256 [2021-11-25 20:42:41,242 INFO L933 BasicCegarLoop]: 36 mSDtfsCounter, 515 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 725 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 515 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 764 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 725 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:41,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [515 Valid, 387 Invalid, 764 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 725 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 20:42:41,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1341 states. [2021-11-25 20:42:41,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1341 to 1054. [2021-11-25 20:42:41,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1054 states, 1050 states have (on average 1.1904761904761905) internal successors, (1250), 1053 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:41,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1054 states to 1054 states and 1250 transitions. [2021-11-25 20:42:41,253 INFO L78 Accepts]: Start accepts. Automaton has 1054 states and 1250 transitions. Word has length 54 [2021-11-25 20:42:41,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:41,254 INFO L470 AbstractCegarLoop]: Abstraction has 1054 states and 1250 transitions. [2021-11-25 20:42:41,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 3.6176470588235294) internal successors, (123), 34 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:41,254 INFO L276 IsEmpty]: Start isEmpty. Operand 1054 states and 1250 transitions. [2021-11-25 20:42:41,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:42:41,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:41,255 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:41,290 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:41,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-25 20:42:41,478 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:42:41,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:41,479 INFO L85 PathProgramCache]: Analyzing trace with hash 209364003, now seen corresponding path program 2 times [2021-11-25 20:42:41,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:41,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971330954] [2021-11-25 20:42:41,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:41,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:41,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:42,398 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 11 proven. 47 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:42:42,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:42,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971330954] [2021-11-25 20:42:42,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971330954] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:42,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463385573] [2021-11-25 20:42:42,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:42:42,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:42,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:42,400 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:42,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-25 20:42:42,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-25 20:42:42,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:42:42,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 20:42:42,646 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:42,665 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:42:42,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:42:42,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:42:42,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:42,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:42:43,686 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:43,686 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 20 treesize of output 20 [2021-11-25 20:42:43,819 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 3 proven. 14 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 20:42:43,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:44,439 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:44,440 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:42:44,447 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:42:44,447 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 37 treesize of output 37 [2021-11-25 20:42:44,451 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 11 treesize of output 7 [2021-11-25 20:42:44,714 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-25 20:42:44,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463385573] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:44,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1424048073] [2021-11-25 20:42:44,715 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:42:44,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:44,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:44,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:44,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:44,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:44,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:44,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:44,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:44,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:42:44,861 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:42:44,862 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 79 treesize of output 78 [2021-11-25 20:42:44,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:44,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:45,010 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:42:45,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:42:45,845 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:42:52,327 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54279#(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 [2021-11-25 20:42:52,328 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:42:52,328 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:42:52,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7, 7] total 35 [2021-11-25 20:42:52,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310562945] [2021-11-25 20:42:52,328 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:42:52,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-25 20:42:52,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:42:52,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-25 20:42:52,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=3152, Unknown=8, NotChecked=0, Total=3422 [2021-11-25 20:42:52,329 INFO L87 Difference]: Start difference. First operand 1054 states and 1250 transitions. Second operand has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 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) [2021-11-25 20:42:54,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:42:54,408 INFO L93 Difference]: Finished difference Result 1285 states and 1501 transitions. [2021-11-25 20:42:54,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:42:54,408 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 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 55 [2021-11-25 20:42:54,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:42:54,412 INFO L225 Difference]: With dead ends: 1285 [2021-11-25 20:42:54,412 INFO L226 Difference]: Without dead ends: 1282 [2021-11-25 20:42:54,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 128 SyntacticMatches, 3 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1839 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=559, Invalid=7805, Unknown=8, NotChecked=0, Total=8372 [2021-11-25 20:42:54,413 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 40 mSDsluCounter, 490 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:42:54,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 480 Invalid, 662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 547 Invalid, 0 Unknown, 105 Unchecked, 0.3s Time] [2021-11-25 20:42:54,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1282 states. [2021-11-25 20:42:54,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1282 to 1177. [2021-11-25 20:42:54,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1177 states, 1173 states have (on average 1.1832907075873829) internal successors, (1388), 1176 states have internal predecessors, (1388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:42:54,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1177 states to 1177 states and 1388 transitions. [2021-11-25 20:42:54,423 INFO L78 Accepts]: Start accepts. Automaton has 1177 states and 1388 transitions. Word has length 55 [2021-11-25 20:42:54,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:42:54,424 INFO L470 AbstractCegarLoop]: Abstraction has 1177 states and 1388 transitions. [2021-11-25 20:42:54,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.5) internal successors, (126), 35 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) [2021-11-25 20:42:54,424 INFO L276 IsEmpty]: Start isEmpty. Operand 1177 states and 1388 transitions. [2021-11-25 20:42:54,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:42:54,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:42:54,425 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:42:54,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-25 20:42:54,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:54,650 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:42:54,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:42:54,651 INFO L85 PathProgramCache]: Analyzing trace with hash -876371259, now seen corresponding path program 1 times [2021-11-25 20:42:54,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:42:54,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535840112] [2021-11-25 20:42:54,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:54,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:42:54,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:54,863 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:42:54,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:42:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535840112] [2021-11-25 20:42:54,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535840112] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:42:54,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613482576] [2021-11-25 20:42:54,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:42:54,864 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:42:54,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:42:54,866 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:42:54,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-25 20:42:55,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:42:55,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-25 20:42:55,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:42:55,301 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:42:55,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:42:55,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:42:55,616 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 20 proven. 15 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:42:55,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613482576] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:42:55,617 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [147743209] [2021-11-25 20:42:55,617 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:42:55,617 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:42:55,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:42:55,618 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:42:55,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:42:55,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:42:55,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:42:55,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:55,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:55,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:42:55,771 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:42:55,771 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 79 treesize of output 78 [2021-11-25 20:42:55,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:55,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:42:55,862 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:42:55,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:42:56,936 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:02,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57188#(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 [2021-11-25 20:43:02,699 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:02,699 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:02,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 29 [2021-11-25 20:43:02,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497338363] [2021-11-25 20:43:02,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:02,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-25 20:43:02,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:02,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-25 20:43:02,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=2492, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 20:43:02,700 INFO L87 Difference]: Start difference. First operand 1177 states and 1388 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) [2021-11-25 20:43:04,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:04,154 INFO L93 Difference]: Finished difference Result 2769 states and 3168 transitions. [2021-11-25 20:43:04,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-25 20:43:04,155 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 55 [2021-11-25 20:43:04,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:04,163 INFO L225 Difference]: With dead ends: 2769 [2021-11-25 20:43:04,163 INFO L226 Difference]: Without dead ends: 2769 [2021-11-25 20:43:04,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1495 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=965, Invalid=5355, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:43:04,164 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 774 mSDsluCounter, 698 mSDsCounter, 0 mSdLazyCounter, 981 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 774 SdHoareTripleChecker+Valid, 654 SdHoareTripleChecker+Invalid, 1049 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 981 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:04,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [774 Valid, 654 Invalid, 1049 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 981 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:43:04,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2769 states. [2021-11-25 20:43:04,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2769 to 1858. [2021-11-25 20:43:04,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1858 states, 1854 states have (on average 1.1790722761596548) internal successors, (2186), 1857 states have internal predecessors, (2186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:04,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1858 states to 1858 states and 2186 transitions. [2021-11-25 20:43:04,186 INFO L78 Accepts]: Start accepts. Automaton has 1858 states and 2186 transitions. Word has length 55 [2021-11-25 20:43:04,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:04,187 INFO L470 AbstractCegarLoop]: Abstraction has 1858 states and 2186 transitions. [2021-11-25 20:43:04,187 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) [2021-11-25 20:43:04,187 INFO L276 IsEmpty]: Start isEmpty. Operand 1858 states and 2186 transitions. [2021-11-25 20:43:04,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-25 20:43:04,188 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:04,189 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 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] [2021-11-25 20:43:04,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:04,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:04,390 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:43:04,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:04,391 INFO L85 PathProgramCache]: Analyzing trace with hash 595423252, now seen corresponding path program 3 times [2021-11-25 20:43:04,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:04,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862101323] [2021-11-25 20:43:04,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:04,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:04,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:04,531 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:43:04,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:04,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862101323] [2021-11-25 20:43:04,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862101323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:04,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77213355] [2021-11-25 20:43:04,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:43:04,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:04,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:04,535 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:04,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-25 20:43:04,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:43:04,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:43:04,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-25 20:43:04,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:05,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:05,147 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-25 20:43:05,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2021-11-25 20:43:06,097 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:43:06,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:08,707 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))) (let ((.cse1 (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)) 0) (= .cse1 0) (not (= (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| 2)) .cse1)))))) is different from false [2021-11-25 20:43:08,724 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-25 20:43:08,724 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 [2021-11-25 20:43:08,731 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:08,731 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 [2021-11-25 20:43:08,766 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-25 20:43:08,766 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 [2021-11-25 20:43:08,772 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 20:43:08,772 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 [2021-11-25 20:43:09,035 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 20:43:09,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77213355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:09,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1708565054] [2021-11-25 20:43:09,036 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:43:09,036 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:09,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:09,036 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:09,036 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:09,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:09,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:43:09,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:43:09,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:09,160 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 11 treesize of output 7 [2021-11-25 20:43:09,209 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:43:09,209 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 79 treesize of output 78 [2021-11-25 20:43:09,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:09,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:09,334 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:43:09,334 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 [2021-11-25 20:43:10,546 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:17,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62274#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (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_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |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_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_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#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|))) (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) (<= 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_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_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_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 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|) (<= 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) (<= 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|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))))' at error location [2021-11-25 20:43:17,544 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:17,544 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:17,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 20, 21] total 51 [2021-11-25 20:43:17,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388857403] [2021-11-25 20:43:17,544 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:17,544 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-25 20:43:17,544 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:17,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-25 20:43:17,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=5097, Unknown=1, NotChecked=144, Total=5550 [2021-11-25 20:43:17,545 INFO L87 Difference]: Start difference. First operand 1858 states and 2186 transitions. Second operand has 52 states, 52 states have (on average 2.3461538461538463) internal successors, (122), 51 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) [2021-11-25 20:43:18,684 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse2 (select |c_#length| |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (and (< 2 |c_ULTIMATE.start_main_~length1~0#1|) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 3) (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))) (let ((.cse1 (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= (select .cse0 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)) 0) (= .cse1 0) (not (= (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| 2)) .cse1)))))) (<= (+ |c_ULTIMATE.start_main_~i~0#1| .cse2) (+ |c_ULTIMATE.start_main_~length1~0#1| 3)) (exists ((|ULTIMATE.start_main_~length1~0#1| Int)) (and (< 2 |ULTIMATE.start_main_~length1~0#1|) (= (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| 3))) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= .cse2 3) (<= |c_ULTIMATE.start_main_~length1~0#1| 3))) is different from false [2021-11-25 20:43:19,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:19,506 INFO L93 Difference]: Finished difference Result 1886 states and 2212 transitions. [2021-11-25 20:43:19,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-25 20:43:19,507 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.3461538461538463) internal successors, (122), 51 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 56 [2021-11-25 20:43:19,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:19,515 INFO L225 Difference]: With dead ends: 1886 [2021-11-25 20:43:19,515 INFO L226 Difference]: Without dead ends: 1858 [2021-11-25 20:43:19,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 96 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 2372 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=511, Invalid=8615, Unknown=2, NotChecked=378, Total=9506 [2021-11-25 20:43:19,517 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 84 mSDsluCounter, 1068 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 912 SdHoareTripleChecker+Invalid, 1084 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 427 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:19,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 912 Invalid, 1084 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 647 Invalid, 0 Unknown, 427 Unchecked, 0.3s Time] [2021-11-25 20:43:19,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1858 states. [2021-11-25 20:43:19,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1858 to 1850. [2021-11-25 20:43:19,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1850 states, 1846 states have (on average 1.1776814734561214) internal successors, (2174), 1849 states have internal predecessors, (2174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:19,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1850 states to 1850 states and 2174 transitions. [2021-11-25 20:43:19,539 INFO L78 Accepts]: Start accepts. Automaton has 1850 states and 2174 transitions. Word has length 56 [2021-11-25 20:43:19,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:19,539 INFO L470 AbstractCegarLoop]: Abstraction has 1850 states and 2174 transitions. [2021-11-25 20:43:19,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.3461538461538463) internal successors, (122), 51 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) [2021-11-25 20:43:19,539 INFO L276 IsEmpty]: Start isEmpty. Operand 1850 states and 2174 transitions. [2021-11-25 20:43:19,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:43:19,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:19,541 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 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] [2021-11-25 20:43:19,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:19,756 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:19,756 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:43:19,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:19,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1068357871, now seen corresponding path program 1 times [2021-11-25 20:43:19,756 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:19,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799181914] [2021-11-25 20:43:19,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:19,757 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:19,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:19,950 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 41 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:43:19,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:19,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799181914] [2021-11-25 20:43:19,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799181914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:19,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172760792] [2021-11-25 20:43:19,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:19,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:19,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:19,952 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:19,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-25 20:43:20,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:20,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-25 20:43:20,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:20,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:20,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:43:20,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:43:20,826 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 16 proven. 37 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:43:20,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:21,399 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:43:21,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172760792] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:21,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1967064323] [2021-11-25 20:43:21,400 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:43:21,401 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:21,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:21,401 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:21,401 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:21,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:21,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:43:21,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:21,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:21,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:21,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:21,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 75 [2021-11-25 20:43:21,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:21,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:21,627 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:43:21,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:43:22,492 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:30,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66467#(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 [2021-11-25 20:43:30,339 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:30,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:30,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2021-11-25 20:43:30,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425719536] [2021-11-25 20:43:30,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:30,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-25 20:43:30,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:30,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-25 20:43:30,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=3908, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:43:30,341 INFO L87 Difference]: Start difference. First operand 1850 states and 2174 transitions. Second operand has 41 states, 40 states have (on average 3.975) internal successors, (159), 40 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:31,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:31,556 INFO L93 Difference]: Finished difference Result 2152 states and 2500 transitions. [2021-11-25 20:43:31,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:43:31,557 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 3.975) internal successors, (159), 40 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 20:43:31,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:31,562 INFO L225 Difference]: With dead ends: 2152 [2021-11-25 20:43:31,562 INFO L226 Difference]: Without dead ends: 2083 [2021-11-25 20:43:31,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1865 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=847, Invalid=6293, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:43:31,563 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 632 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 1598 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 632 SdHoareTripleChecker+Valid, 912 SdHoareTripleChecker+Invalid, 1638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:31,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [632 Valid, 912 Invalid, 1638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1598 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 20:43:31,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2021-11-25 20:43:31,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 1733. [2021-11-25 20:43:31,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1733 states, 1729 states have (on average 1.1804511278195489) internal successors, (2041), 1732 states have internal predecessors, (2041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:31,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1733 states to 1733 states and 2041 transitions. [2021-11-25 20:43:31,579 INFO L78 Accepts]: Start accepts. Automaton has 1733 states and 2041 transitions. Word has length 58 [2021-11-25 20:43:31,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:31,579 INFO L470 AbstractCegarLoop]: Abstraction has 1733 states and 2041 transitions. [2021-11-25 20:43:31,580 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 3.975) internal successors, (159), 40 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:31,580 INFO L276 IsEmpty]: Start isEmpty. Operand 1733 states and 2041 transitions. [2021-11-25 20:43:31,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:43:31,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:31,581 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:43:31,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-25 20:43:31,781 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:31,782 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:43:31,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:31,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1469708363, now seen corresponding path program 2 times [2021-11-25 20:43:31,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:31,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964305555] [2021-11-25 20:43:31,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:31,782 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:31,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:32,578 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 41 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-25 20:43:32,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:32,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964305555] [2021-11-25 20:43:32,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964305555] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:32,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508426522] [2021-11-25 20:43:32,579 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:43:32,579 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:32,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:32,581 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:32,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-25 20:43:32,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:43:32,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:43:32,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-25 20:43:32,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:32,790 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:43:32,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:43:32,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-25 20:43:32,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-25 20:43:33,009 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 18 treesize of output 20 [2021-11-25 20:43:33,207 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:33,207 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 21 treesize of output 21 [2021-11-25 20:43:33,373 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 7 proven. 11 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-25 20:43:33,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:34,153 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:34,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:43:34,159 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:34,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 37 [2021-11-25 20:43:34,163 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 11 treesize of output 7 [2021-11-25 20:43:34,601 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-25 20:43:34,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508426522] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:34,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2144908575] [2021-11-25 20:43:34,602 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:43:34,602 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:34,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:34,602 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:34,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:34,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:34,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:43:34,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:34,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:34,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:34,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:34,757 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 83 treesize of output 75 [2021-11-25 20:43:34,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:34,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:34,846 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:43:34,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:43:35,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:43:43,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70803#(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 [2021-11-25 20:43:43,928 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:43:43,928 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:43:43,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11, 11] total 45 [2021-11-25 20:43:43,928 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177609247] [2021-11-25 20:43:43,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:43:43,929 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-25 20:43:43,929 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:43:43,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-25 20:43:43,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=4601, Unknown=14, NotChecked=0, Total=4970 [2021-11-25 20:43:43,929 INFO L87 Difference]: Start difference. First operand 1733 states and 2041 transitions. Second operand has 46 states, 46 states have (on average 2.869565217391304) internal successors, (132), 45 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:51,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:43:51,967 INFO L93 Difference]: Finished difference Result 2451 states and 2808 transitions. [2021-11-25 20:43:51,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-25 20:43:51,967 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.869565217391304) internal successors, (132), 45 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-25 20:43:51,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:43:51,971 INFO L225 Difference]: With dead ends: 2451 [2021-11-25 20:43:51,971 INFO L226 Difference]: Without dead ends: 2451 [2021-11-25 20:43:51,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 128 SyntacticMatches, 17 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7720 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=2775, Invalid=21081, Unknown=14, NotChecked=0, Total=23870 [2021-11-25 20:43:51,974 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 1503 mSDsluCounter, 842 mSDsCounter, 0 mSdLazyCounter, 2475 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1503 SdHoareTripleChecker+Valid, 688 SdHoareTripleChecker+Invalid, 2829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 2475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:43:51,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1503 Valid, 688 Invalid, 2829 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 2475 Invalid, 0 Unknown, 106 Unchecked, 1.3s Time] [2021-11-25 20:43:51,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2451 states. [2021-11-25 20:43:52,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2451 to 1817. [2021-11-25 20:43:52,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1817 states, 1813 states have (on average 1.1682294539437397) internal successors, (2118), 1816 states have internal predecessors, (2118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:52,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1817 states to 1817 states and 2118 transitions. [2021-11-25 20:43:52,015 INFO L78 Accepts]: Start accepts. Automaton has 1817 states and 2118 transitions. Word has length 58 [2021-11-25 20:43:52,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:43:52,015 INFO L470 AbstractCegarLoop]: Abstraction has 1817 states and 2118 transitions. [2021-11-25 20:43:52,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.869565217391304) internal successors, (132), 45 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:43:52,016 INFO L276 IsEmpty]: Start isEmpty. Operand 1817 states and 2118 transitions. [2021-11-25 20:43:52,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 20:43:52,018 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:43:52,018 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] [2021-11-25 20:43:52,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-25 20:43:52,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-25 20:43:52,238 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:43:52,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:43:52,239 INFO L85 PathProgramCache]: Analyzing trace with hash 1626756432, now seen corresponding path program 4 times [2021-11-25 20:43:52,239 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:43:52,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573992985] [2021-11-25 20:43:52,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:43:52,239 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:43:52,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:52,619 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 3 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:43:52,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:43:52,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573992985] [2021-11-25 20:43:52,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573992985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:43:52,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026609171] [2021-11-25 20:43:52,620 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:43:52,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:43:52,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:43:52,626 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:43:52,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-25 20:43:52,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:43:52,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-25 20:43:52,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:43:52,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:43:53,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:53,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2021-11-25 20:43:54,675 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:43:54,676 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 14 [2021-11-25 20:43:54,715 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 5 proven. 49 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-25 20:43:54,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:43:55,526 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (v_ArrVal_2379 (Array Int Int)) (|v_ULTIMATE.start_cstrstr_#t~post17#1.offset_359| Int)) (let ((.cse0 (select v_ArrVal_2379 (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| 2)))) (or (= .cse0 0) (< |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_359| 0) (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2379) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 3 |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_359|)) .cse0)) (< |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |v_ULTIMATE.start_cstrstr_#t~post17#1.offset_359|)))) is different from false [2021-11-25 20:43:55,537 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:55,537 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 29 [2021-11-25 20:43:55,543 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:55,543 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 48 treesize of output 48 [2021-11-25 20:43:55,550 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:43:55,550 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 38 treesize of output 34 [2021-11-25 20:43:56,242 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 13 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 20:43:56,242 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026609171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:43:56,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405566194] [2021-11-25 20:43:56,243 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:43:56,243 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:43:56,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:43:56,243 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:43:56,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:43:56,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:43:56,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:43:56,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:56,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:43:56,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:43:56,435 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:43:56,436 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 79 treesize of output 78 [2021-11-25 20:43:56,487 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 14 treesize of output 10 [2021-11-25 20:43:56,514 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 [2021-11-25 20:43:56,580 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:43:56,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:43:57,899 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:05,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75687#(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 [2021-11-25 20:44:05,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:05,697 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:05,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 24, 22] total 61 [2021-11-25 20:44:05,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565009943] [2021-11-25 20:44:05,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:05,698 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-25 20:44:05,698 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:05,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-25 20:44:05,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328, Invalid=6815, Unknown=1, NotChecked=166, Total=7310 [2021-11-25 20:44:05,699 INFO L87 Difference]: Start difference. First operand 1817 states and 2118 transitions. Second operand has 62 states, 62 states have (on average 2.274193548387097) internal successors, (141), 61 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) [2021-11-25 20:44:07,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:07,221 INFO L93 Difference]: Finished difference Result 1936 states and 2237 transitions. [2021-11-25 20:44:07,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 20:44:07,221 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.274193548387097) internal successors, (141), 61 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 58 [2021-11-25 20:44:07,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:07,223 INFO L225 Difference]: With dead ends: 1936 [2021-11-25 20:44:07,224 INFO L226 Difference]: Without dead ends: 1936 [2021-11-25 20:44:07,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 107 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2830 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=463, Invalid=9640, Unknown=1, NotChecked=198, Total=10302 [2021-11-25 20:44:07,224 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 145 mSDsluCounter, 2324 mSDsCounter, 0 mSdLazyCounter, 1636 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 2001 SdHoareTripleChecker+Invalid, 2653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1000 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:07,224 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 2001 Invalid, 2653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1636 Invalid, 0 Unknown, 1000 Unchecked, 0.7s Time] [2021-11-25 20:44:07,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1936 states. [2021-11-25 20:44:07,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1936 to 1795. [2021-11-25 20:44:07,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1795 states, 1791 states have (on average 1.1652707984366275) internal successors, (2087), 1794 states have internal predecessors, (2087), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:07,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1795 states to 1795 states and 2087 transitions. [2021-11-25 20:44:07,239 INFO L78 Accepts]: Start accepts. Automaton has 1795 states and 2087 transitions. Word has length 58 [2021-11-25 20:44:07,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:07,239 INFO L470 AbstractCegarLoop]: Abstraction has 1795 states and 2087 transitions. [2021-11-25 20:44:07,239 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.274193548387097) internal successors, (141), 61 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) [2021-11-25 20:44:07,240 INFO L276 IsEmpty]: Start isEmpty. Operand 1795 states and 2087 transitions. [2021-11-25 20:44:07,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 20:44:07,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:07,242 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] [2021-11-25 20:44:07,270 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:07,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:07,454 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:44:07,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:07,455 INFO L85 PathProgramCache]: Analyzing trace with hash 600497036, now seen corresponding path program 5 times [2021-11-25 20:44:07,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:07,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634773707] [2021-11-25 20:44:07,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:07,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:07,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:07,649 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:44:07,649 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:07,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634773707] [2021-11-25 20:44:07,649 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634773707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:07,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749913313] [2021-11-25 20:44:07,649 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:44:07,650 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:07,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:07,650 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:07,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-25 20:44:07,890 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 20:44:07,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:07,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-25 20:44:07,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:07,912 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:44:07,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:44:07,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:44:08,085 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 [2021-11-25 20:44:08,107 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 18 treesize of output 20 [2021-11-25 20:44:08,233 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:44:08,234 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 21 treesize of output 21 [2021-11-25 20:44:08,292 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 20:44:08,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:08,816 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:44:08,816 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:44:08,822 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:44:08,822 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 37 treesize of output 37 [2021-11-25 20:44:08,826 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 11 treesize of output 7 [2021-11-25 20:44:09,189 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 20:44:09,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749913313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:09,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [946151910] [2021-11-25 20:44:09,190 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:44:09,190 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:09,194 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:09,195 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:09,195 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:09,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:09,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:44:09,271 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 11 treesize of output 7 [2021-11-25 20:44:09,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:09,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:44:09,364 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:44:09,365 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 79 treesize of output 78 [2021-11-25 20:44:09,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:09,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:09,485 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:44:09,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:44:10,714 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:16,912 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79860#(and (< (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) (+ |ULTIMATE.start_cstrncmp_~s1#1.offset| 1)) (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_~s#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (= |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_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_~s1#1.offset| |ULTIMATE.start_cstrncmp_#in~s1#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|))) (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) (<= 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_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_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_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_#in~s2#1.offset| 1) (<= 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|) (<= 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) (<= 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|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|))))' at error location [2021-11-25 20:44:16,913 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:16,913 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:16,913 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7, 7] total 27 [2021-11-25 20:44:16,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156078990] [2021-11-25 20:44:16,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:16,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 20:44:16,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:16,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 20:44:16,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=2420, Unknown=5, NotChecked=0, Total=2652 [2021-11-25 20:44:16,914 INFO L87 Difference]: Start difference. First operand 1795 states and 2087 transitions. Second operand has 29 states, 28 states have (on average 4.107142857142857) internal successors, (115), 28 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) [2021-11-25 20:44:18,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:18,946 INFO L93 Difference]: Finished difference Result 2596 states and 2934 transitions. [2021-11-25 20:44:18,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 20:44:18,947 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 4.107142857142857) internal successors, (115), 28 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 60 [2021-11-25 20:44:18,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:18,949 INFO L225 Difference]: With dead ends: 2596 [2021-11-25 20:44:18,949 INFO L226 Difference]: Without dead ends: 2596 [2021-11-25 20:44:18,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2238 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1371, Invalid=8130, Unknown=5, NotChecked=0, Total=9506 [2021-11-25 20:44:18,955 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 488 mSDsluCounter, 682 mSDsCounter, 0 mSdLazyCounter, 1051 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 488 SdHoareTripleChecker+Valid, 657 SdHoareTripleChecker+Invalid, 1264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1051 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:18,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [488 Valid, 657 Invalid, 1264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1051 Invalid, 0 Unknown, 140 Unchecked, 0.6s Time] [2021-11-25 20:44:18,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2596 states. [2021-11-25 20:44:18,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2596 to 1794. [2021-11-25 20:44:18,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1794 states, 1791 states have (on average 1.137353433835846) internal successors, (2037), 1793 states have internal predecessors, (2037), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:18,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1794 states to 1794 states and 2037 transitions. [2021-11-25 20:44:18,973 INFO L78 Accepts]: Start accepts. Automaton has 1794 states and 2037 transitions. Word has length 60 [2021-11-25 20:44:18,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:18,974 INFO L470 AbstractCegarLoop]: Abstraction has 1794 states and 2037 transitions. [2021-11-25 20:44:18,974 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 4.107142857142857) internal successors, (115), 28 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) [2021-11-25 20:44:18,974 INFO L276 IsEmpty]: Start isEmpty. Operand 1794 states and 2037 transitions. [2021-11-25 20:44:18,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-25 20:44:18,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:18,977 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:44:19,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:19,202 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-25 20:44:19,202 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:44:19,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:19,203 INFO L85 PathProgramCache]: Analyzing trace with hash -1345477823, now seen corresponding path program 2 times [2021-11-25 20:44:19,203 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:19,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303061939] [2021-11-25 20:44:19,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:19,203 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:19,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:19,506 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 43 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-25 20:44:19,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:19,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303061939] [2021-11-25 20:44:19,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303061939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:19,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109878669] [2021-11-25 20:44:19,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:44:19,507 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:19,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:19,508 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:19,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-25 20:44:19,703 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-25 20:44:19,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:19,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 20:44:19,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:19,835 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 20:44:19,835 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:44:19,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109878669] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:44:19,835 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 20:44:19,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [15] total 19 [2021-11-25 20:44:19,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777267631] [2021-11-25 20:44:19,836 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:44:19,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:44:19,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:19,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:44:19,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:44:19,836 INFO L87 Difference]: Start difference. First operand 1794 states and 2037 transitions. Second operand has 5 states, 4 states have (on average 8.25) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:19,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:19,893 INFO L93 Difference]: Finished difference Result 1795 states and 2019 transitions. [2021-11-25 20:44:19,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:44:19,893 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 8.25) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-25 20:44:19,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:19,895 INFO L225 Difference]: With dead ends: 1795 [2021-11-25 20:44:19,895 INFO L226 Difference]: Without dead ends: 1793 [2021-11-25 20:44:19,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=366, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:44:19,895 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 6 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:19,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:44:19,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1793 states. [2021-11-25 20:44:19,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1793 to 1730. [2021-11-25 20:44:19,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1730 states, 1728 states have (on average 1.1261574074074074) internal successors, (1946), 1729 states have internal predecessors, (1946), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:19,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1730 states to 1730 states and 1946 transitions. [2021-11-25 20:44:19,909 INFO L78 Accepts]: Start accepts. Automaton has 1730 states and 1946 transitions. Word has length 64 [2021-11-25 20:44:19,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:19,909 INFO L470 AbstractCegarLoop]: Abstraction has 1730 states and 1946 transitions. [2021-11-25 20:44:19,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 8.25) internal successors, (33), 5 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:19,910 INFO L276 IsEmpty]: Start isEmpty. Operand 1730 states and 1946 transitions. [2021-11-25 20:44:19,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 20:44:19,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:19,911 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] [2021-11-25 20:44:19,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:20,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:20,112 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:44:20,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:20,112 INFO L85 PathProgramCache]: Analyzing trace with hash 958595884, now seen corresponding path program 1 times [2021-11-25 20:44:20,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:20,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361981064] [2021-11-25 20:44:20,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:20,112 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:20,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:20,389 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 11 proven. 38 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:44:20,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:20,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361981064] [2021-11-25 20:44:20,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361981064] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:20,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989037516] [2021-11-25 20:44:20,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:20,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:20,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:20,391 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:20,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-25 20:44:20,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:20,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-25 20:44:20,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:20,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:21,028 INFO L354 Elim1Store]: treesize reduction 27, result has 46.0 percent of original size [2021-11-25 20:44:21,028 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 37 [2021-11-25 20:44:21,806 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 [2021-11-25 20:44:21,811 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 11 proven. 60 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:44:21,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:35,094 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-25 20:44:35,094 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 219 treesize of output 222 [2021-11-25 20:44:35,105 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:44:35,106 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 43 treesize of output 45 [2021-11-25 20:44:35,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-25 20:44:35,151 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:44:35,151 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 67 treesize of output 92 [2021-11-25 20:44:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 11 proven. 60 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-25 20:44:35,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989037516] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:35,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [26273733] [2021-11-25 20:44:35,656 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-25 20:44:35,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:35,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:35,656 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:35,656 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:35,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:35,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:44:35,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:44:35,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:35,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:44:35,836 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:44:35,836 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 79 treesize of output 78 [2021-11-25 20:44:35,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:35,894 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 [2021-11-25 20:44:35,927 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:44:35,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:44:38,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:47,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88533#(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 [2021-11-25 20:44:47,686 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:47,686 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:47,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 26, 26] total 47 [2021-11-25 20:44:47,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581168127] [2021-11-25 20:44:47,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:47,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 20:44:47,687 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:47,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 20:44:47,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=5369, Unknown=11, NotChecked=0, Total=5700 [2021-11-25 20:44:47,688 INFO L87 Difference]: Start difference. First operand 1730 states and 1946 transitions. Second operand has 48 states, 48 states have (on average 2.2083333333333335) internal successors, (106), 47 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:49,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:49,426 INFO L93 Difference]: Finished difference Result 1827 states and 2032 transitions. [2021-11-25 20:44:49,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-25 20:44:49,426 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.2083333333333335) internal successors, (106), 47 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 65 [2021-11-25 20:44:49,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:49,427 INFO L225 Difference]: With dead ends: 1827 [2021-11-25 20:44:49,428 INFO L226 Difference]: Without dead ends: 1502 [2021-11-25 20:44:49,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 130 SyntacticMatches, 6 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2746 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=644, Invalid=9647, Unknown=11, NotChecked=0, Total=10302 [2021-11-25 20:44:49,428 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 194 mSDsluCounter, 1675 mSDsCounter, 0 mSdLazyCounter, 1593 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 1488 SdHoareTripleChecker+Invalid, 1819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:49,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 1488 Invalid, 1819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1593 Invalid, 0 Unknown, 177 Unchecked, 0.7s Time] [2021-11-25 20:44:49,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1502 states. [2021-11-25 20:44:49,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1502 to 1303. [2021-11-25 20:44:49,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1303 states, 1301 states have (on average 1.1360491929285166) internal successors, (1478), 1302 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:49,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1303 states to 1303 states and 1478 transitions. [2021-11-25 20:44:49,445 INFO L78 Accepts]: Start accepts. Automaton has 1303 states and 1478 transitions. Word has length 65 [2021-11-25 20:44:49,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:49,445 INFO L470 AbstractCegarLoop]: Abstraction has 1303 states and 1478 transitions. [2021-11-25 20:44:49,446 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.2083333333333335) internal successors, (106), 47 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:49,446 INFO L276 IsEmpty]: Start isEmpty. Operand 1303 states and 1478 transitions. [2021-11-25 20:44:49,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 20:44:49,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:49,448 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 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] [2021-11-25 20:44:49,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:49,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:49,670 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:44:49,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:49,671 INFO L85 PathProgramCache]: Analyzing trace with hash -1611659461, now seen corresponding path program 3 times [2021-11-25 20:44:49,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:49,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362789565] [2021-11-25 20:44:49,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:49,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:49,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:49,828 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 62 proven. 11 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:44:49,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:49,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362789565] [2021-11-25 20:44:49,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [362789565] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:49,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904349991] [2021-11-25 20:44:49,829 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:44:49,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:49,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:49,831 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:49,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-25 20:44:50,068 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:44:50,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:50,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 20:44:50,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:50,229 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 62 proven. 11 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:44:50,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:44:50,291 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:44:50,291 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 [2021-11-25 20:44:50,466 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 67 proven. 6 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 20:44:50,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904349991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:44:50,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211015162] [2021-11-25 20:44:50,467 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2021-11-25 20:44:50,467 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:44:50,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:44:50,467 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:44:50,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:44:50,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:50,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:44:50,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:50,544 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 14 treesize of output 10 [2021-11-25 20:44:50,572 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 14 treesize of output 10 [2021-11-25 20:44:50,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:50,606 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 83 treesize of output 75 [2021-11-25 20:44:50,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:50,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:44:50,690 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:44:50,691 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 [2021-11-25 20:44:51,554 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:44:58,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '92165#(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 [2021-11-25 20:44:58,111 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:44:58,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:44:58,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2021-11-25 20:44:58,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435062815] [2021-11-25 20:44:58,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:44:58,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 20:44:58,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:44:58,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 20:44:58,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 20:44:58,112 INFO L87 Difference]: Start difference. First operand 1303 states and 1478 transitions. Second operand has 25 states, 24 states have (on average 4.0) internal successors, (96), 25 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:58,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:44:58,774 INFO L93 Difference]: Finished difference Result 1473 states and 1645 transitions. [2021-11-25 20:44:58,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-25 20:44:58,775 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 4.0) internal successors, (96), 25 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 67 [2021-11-25 20:44:58,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:44:58,776 INFO L225 Difference]: With dead ends: 1473 [2021-11-25 20:44:58,776 INFO L226 Difference]: Without dead ends: 1365 [2021-11-25 20:44:58,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1905 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=1028, Invalid=4522, Unknown=0, NotChecked=0, Total=5550 [2021-11-25 20:44:58,777 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 157 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 582 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:44:58,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 384 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 582 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:44:58,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1365 states. [2021-11-25 20:44:58,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1365 to 1075. [2021-11-25 20:44:58,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1075 states, 1073 states have (on average 1.1379310344827587) internal successors, (1221), 1074 states have internal predecessors, (1221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:58,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1075 states to 1075 states and 1221 transitions. [2021-11-25 20:44:58,788 INFO L78 Accepts]: Start accepts. Automaton has 1075 states and 1221 transitions. Word has length 67 [2021-11-25 20:44:58,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:44:58,789 INFO L470 AbstractCegarLoop]: Abstraction has 1075 states and 1221 transitions. [2021-11-25 20:44:58,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 4.0) internal successors, (96), 25 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:44:58,789 INFO L276 IsEmpty]: Start isEmpty. Operand 1075 states and 1221 transitions. [2021-11-25 20:44:58,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-25 20:44:58,790 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:44:58,791 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:44:58,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-25 20:44:59,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-25 20:44:59,018 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:44:59,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:44:59,018 INFO L85 PathProgramCache]: Analyzing trace with hash 2045250583, now seen corresponding path program 2 times [2021-11-25 20:44:59,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:44:59,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011932246] [2021-11-25 20:44:59,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:44:59,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:44:59,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:44:59,238 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 44 proven. 16 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:44:59,239 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:44:59,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011932246] [2021-11-25 20:44:59,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011932246] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:44:59,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40689957] [2021-11-25 20:44:59,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:44:59,239 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:44:59,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:44:59,243 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:44:59,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-25 20:44:59,587 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:44:59,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:44:59,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 20:44:59,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:44:59,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:44:59,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:44:59,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:45:00,120 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 41 proven. 19 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:45:00,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:00,447 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 41 proven. 19 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:45:00,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [40689957] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:00,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1178833403] [2021-11-25 20:45:00,448 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:45:00,449 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:00,449 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:00,449 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:00,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:00,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:00,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:45:00,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:45:00,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:00,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:00,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:00,600 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 83 treesize of output 75 [2021-11-25 20:45:00,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:00,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:00,688 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:45:00,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:45:01,758 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:07,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95229#(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 [2021-11-25 20:45:07,565 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:07,565 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:07,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 37 [2021-11-25 20:45:07,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529510703] [2021-11-25 20:45:07,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:07,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:45:07,566 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:07,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:45:07,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=3391, Unknown=0, NotChecked=0, Total=3660 [2021-11-25 20:45:07,566 INFO L87 Difference]: Start difference. First operand 1075 states and 1221 transitions. Second operand has 38 states, 38 states have (on average 3.5) internal successors, (133), 37 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) [2021-11-25 20:45:08,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:08,634 INFO L93 Difference]: Finished difference Result 1277 states and 1420 transitions. [2021-11-25 20:45:08,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:45:08,635 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 37 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 67 [2021-11-25 20:45:08,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:08,636 INFO L225 Difference]: With dead ends: 1277 [2021-11-25 20:45:08,636 INFO L226 Difference]: Without dead ends: 988 [2021-11-25 20:45:08,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2135 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=874, Invalid=6266, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:45:08,636 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 664 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 664 SdHoareTripleChecker+Valid, 393 SdHoareTripleChecker+Invalid, 781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:08,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [664 Valid, 393 Invalid, 781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:45:08,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2021-11-25 20:45:08,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 988. [2021-11-25 20:45:08,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 988 states, 986 states have (on average 1.140973630831643) internal successors, (1125), 987 states have internal predecessors, (1125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:08,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 988 states to 988 states and 1125 transitions. [2021-11-25 20:45:08,644 INFO L78 Accepts]: Start accepts. Automaton has 988 states and 1125 transitions. Word has length 67 [2021-11-25 20:45:08,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:08,645 INFO L470 AbstractCegarLoop]: Abstraction has 988 states and 1125 transitions. [2021-11-25 20:45:08,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.5) internal successors, (133), 37 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) [2021-11-25 20:45:08,645 INFO L276 IsEmpty]: Start isEmpty. Operand 988 states and 1125 transitions. [2021-11-25 20:45:08,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 20:45:08,646 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:08,646 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:08,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:08,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:08,846 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:45:08,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:08,847 INFO L85 PathProgramCache]: Analyzing trace with hash 1476446555, now seen corresponding path program 3 times [2021-11-25 20:45:08,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:08,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763398255] [2021-11-25 20:45:08,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:08,847 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:08,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:09,090 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 44 proven. 25 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:45:09,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:09,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763398255] [2021-11-25 20:45:09,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763398255] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:09,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253280495] [2021-11-25 20:45:09,091 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:45:09,091 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:09,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:09,092 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:09,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-25 20:45:09,338 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:45:09,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:45:09,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 140 conjunts are in the unsatisfiable core [2021-11-25 20:45:09,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:09,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:45:09,902 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 20:45:09,902 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 10 [2021-11-25 20:45:09,931 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 69 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-25 20:45:09,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:12,827 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 11 proven. 45 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-25 20:45:12,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253280495] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:12,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671759765] [2021-11-25 20:45:12,828 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:45:12,828 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:12,828 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:12,829 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:12,829 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:12,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:12,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:45:12,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:45:12,908 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 14 treesize of output 10 [2021-11-25 20:45:12,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:12,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:12,969 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 83 treesize of output 75 [2021-11-25 20:45:13,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:13,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:13,059 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:45:13,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:45:14,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:21,182 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98026#(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 [2021-11-25 20:45:21,183 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:21,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:21,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20, 20] total 53 [2021-11-25 20:45:21,183 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713500540] [2021-11-25 20:45:21,183 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:21,183 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 20:45:21,183 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:21,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 20:45:21,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=5439, Unknown=1, NotChecked=0, Total=5700 [2021-11-25 20:45:21,184 INFO L87 Difference]: Start difference. First operand 988 states and 1125 transitions. Second operand has 53 states, 53 states have (on average 2.943396226415094) internal successors, (156), 53 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:26,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:26,050 INFO L93 Difference]: Finished difference Result 2464 states and 2742 transitions. [2021-11-25 20:45:26,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-25 20:45:26,051 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.943396226415094) internal successors, (156), 53 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-25 20:45:26,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:26,052 INFO L225 Difference]: With dead ends: 2464 [2021-11-25 20:45:26,052 INFO L226 Difference]: Without dead ends: 1583 [2021-11-25 20:45:26,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5650 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=1661, Invalid=21290, Unknown=1, NotChecked=0, Total=22952 [2021-11-25 20:45:26,053 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 855 mSDsluCounter, 3046 mSDsCounter, 0 mSdLazyCounter, 3400 mSolverCounterSat, 148 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 855 SdHoareTripleChecker+Valid, 2806 SdHoareTripleChecker+Invalid, 4608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 148 IncrementalHoareTripleChecker+Valid, 3400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1060 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:26,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [855 Valid, 2806 Invalid, 4608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [148 Valid, 3400 Invalid, 0 Unknown, 1060 Unchecked, 1.5s Time] [2021-11-25 20:45:26,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1583 states. [2021-11-25 20:45:26,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1583 to 911. [2021-11-25 20:45:26,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 911 states, 909 states have (on average 1.1452145214521452) internal successors, (1041), 910 states have internal predecessors, (1041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:26,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 911 states to 911 states and 1041 transitions. [2021-11-25 20:45:26,063 INFO L78 Accepts]: Start accepts. Automaton has 911 states and 1041 transitions. Word has length 69 [2021-11-25 20:45:26,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:26,063 INFO L470 AbstractCegarLoop]: Abstraction has 911 states and 1041 transitions. [2021-11-25 20:45:26,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.943396226415094) internal successors, (156), 53 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:26,063 INFO L276 IsEmpty]: Start isEmpty. Operand 911 states and 1041 transitions. [2021-11-25 20:45:26,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 20:45:26,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:26,064 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:26,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:26,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:26,266 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:45:26,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:26,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1980182101, now seen corresponding path program 4 times [2021-11-25 20:45:26,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:26,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248257083] [2021-11-25 20:45:26,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:26,267 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:26,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:26,451 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 25 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-25 20:45:26,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:26,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248257083] [2021-11-25 20:45:26,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248257083] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:26,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186995834] [2021-11-25 20:45:26,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:45:26,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:26,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:26,453 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:26,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-25 20:45:26,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:26,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-25 20:45:26,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:26,695 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:45:26,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:45:27,040 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 25 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-25 20:45:27,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:27,358 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 25 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2021-11-25 20:45:27,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186995834] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:27,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1494895822] [2021-11-25 20:45:27,360 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:45:27,360 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:27,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:27,360 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:27,360 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:27,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:27,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:45:27,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:45:27,439 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 14 treesize of output 10 [2021-11-25 20:45:27,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:45:27,520 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:45:27,521 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 79 treesize of output 78 [2021-11-25 20:45:27,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:27,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:27,638 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:45:27,638 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 [2021-11-25 20:45:28,501 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:34,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102051#(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|) (<= |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|) (< (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_~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|) (<= 0 |ULTIMATE.start_main_#t~malloc23#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post5#1.base|) (= |ULTIMATE.start_main_#t~malloc22#1.offset| 0) (<= |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|) (= |#NULL.base| 0))' at error location [2021-11-25 20:45:34,410 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:34,410 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:34,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 39 [2021-11-25 20:45:34,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454864520] [2021-11-25 20:45:34,410 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:34,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-25 20:45:34,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:34,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-25 20:45:34,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=3400, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 20:45:34,411 INFO L87 Difference]: Start difference. First operand 911 states and 1041 transitions. Second operand has 40 states, 40 states have (on average 2.225) internal successors, (89), 39 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:34,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:34,939 INFO L93 Difference]: Finished difference Result 1577 states and 1801 transitions. [2021-11-25 20:45:34,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 20:45:34,939 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.225) internal successors, (89), 39 states have internal predecessors, (89), 0 states have call successors, (0), 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 73 [2021-11-25 20:45:34,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:34,941 INFO L225 Difference]: With dead ends: 1577 [2021-11-25 20:45:34,941 INFO L226 Difference]: Without dead ends: 1576 [2021-11-25 20:45:34,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 172 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2454 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=755, Invalid=5097, Unknown=0, NotChecked=0, Total=5852 [2021-11-25 20:45:34,942 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 897 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 897 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:34,942 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [897 Valid, 320 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:45:34,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1576 states. [2021-11-25 20:45:34,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1576 to 925. [2021-11-25 20:45:34,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 925 states, 923 states have (on average 1.1451787648970748) internal successors, (1057), 924 states have internal predecessors, (1057), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:34,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 925 states to 925 states and 1057 transitions. [2021-11-25 20:45:34,957 INFO L78 Accepts]: Start accepts. Automaton has 925 states and 1057 transitions. Word has length 73 [2021-11-25 20:45:34,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:34,958 INFO L470 AbstractCegarLoop]: Abstraction has 925 states and 1057 transitions. [2021-11-25 20:45:34,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.225) internal successors, (89), 39 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:34,958 INFO L276 IsEmpty]: Start isEmpty. Operand 925 states and 1057 transitions. [2021-11-25 20:45:34,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 20:45:34,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:34,960 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:34,994 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:35,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:35,186 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:45:35,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:35,187 INFO L85 PathProgramCache]: Analyzing trace with hash -1336555977, now seen corresponding path program 1 times [2021-11-25 20:45:35,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:35,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591233535] [2021-11-25 20:45:35,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:35,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:35,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:35,328 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 21 proven. 19 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-25 20:45:35,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:35,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591233535] [2021-11-25 20:45:35,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591233535] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:35,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686155817] [2021-11-25 20:45:35,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:35,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:35,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:35,330 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:35,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-25 20:45:35,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:35,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 20:45:35,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:35,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:35,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:45:35,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:45:36,023 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 30 proven. 37 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:45:36,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:36,470 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 29 proven. 38 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 20:45:36,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686155817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:36,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [815260063] [2021-11-25 20:45:36,471 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-25 20:45:36,471 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:36,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:36,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:36,471 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:36,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:36,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:45:36,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:45:36,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:36,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:36,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:36,611 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 83 treesize of output 75 [2021-11-25 20:45:36,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:36,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:36,701 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:45:36,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:45:40,986 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:49,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '105075#(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) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 20:45:49,008 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:49,008 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:49,008 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 16, 16] total 38 [2021-11-25 20:45:49,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809597856] [2021-11-25 20:45:49,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:49,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-25 20:45:49,009 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:49,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-25 20:45:49,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=3976, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:45:49,010 INFO L87 Difference]: Start difference. First operand 925 states and 1057 transitions. Second operand has 38 states, 38 states have (on average 4.394736842105263) internal successors, (167), 38 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:50,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:45:50,458 INFO L93 Difference]: Finished difference Result 1193 states and 1336 transitions. [2021-11-25 20:45:50,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-25 20:45:50,458 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 4.394736842105263) internal successors, (167), 38 states have internal predecessors, (167), 0 states have call successors, (0), 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 73 [2021-11-25 20:45:50,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:45:50,459 INFO L225 Difference]: With dead ends: 1193 [2021-11-25 20:45:50,460 INFO L226 Difference]: Without dead ends: 984 [2021-11-25 20:45:50,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 162 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2501 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=954, Invalid=7788, Unknown=0, NotChecked=0, Total=8742 [2021-11-25 20:45:50,460 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 407 mSDsluCounter, 741 mSDsCounter, 0 mSdLazyCounter, 1144 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 740 SdHoareTripleChecker+Invalid, 1217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:45:50,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [407 Valid, 740 Invalid, 1217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1144 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:45:50,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2021-11-25 20:45:50,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 615. [2021-11-25 20:45:50,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 615 states, 613 states have (on average 1.1435562805872757) internal successors, (701), 614 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:50,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 615 states to 615 states and 701 transitions. [2021-11-25 20:45:50,466 INFO L78 Accepts]: Start accepts. Automaton has 615 states and 701 transitions. Word has length 73 [2021-11-25 20:45:50,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:45:50,467 INFO L470 AbstractCegarLoop]: Abstraction has 615 states and 701 transitions. [2021-11-25 20:45:50,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 4.394736842105263) internal successors, (167), 38 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:45:50,467 INFO L276 IsEmpty]: Start isEmpty. Operand 615 states and 701 transitions. [2021-11-25 20:45:50,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 20:45:50,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:45:50,468 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:45:50,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-25 20:45:50,668 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:50,668 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:45:50,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:45:50,668 INFO L85 PathProgramCache]: Analyzing trace with hash 1526293919, now seen corresponding path program 5 times [2021-11-25 20:45:50,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:45:50,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066833006] [2021-11-25 20:45:50,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:45:50,669 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:45:50,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:45:50,936 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-25 20:45:50,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:45:50,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066833006] [2021-11-25 20:45:50,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066833006] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:45:50,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688776797] [2021-11-25 20:45:50,937 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:45:50,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:45:50,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:45:50,939 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:45:50,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-25 20:45:51,222 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:45:51,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:45:51,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-25 20:45:51,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:45:51,628 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 48 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 20:45:51,628 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:45:51,982 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:45:51,982 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 15 treesize of output 19 [2021-11-25 20:45:52,248 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 48 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 20:45:52,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688776797] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:45:52,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [8123756] [2021-11-25 20:45:52,249 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:45:52,249 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:45:52,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:45:52,250 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:45:52,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:45:52,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:45:52,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:45:52,303 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 14 treesize of output 10 [2021-11-25 20:45:52,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:52,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:45:52,419 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:45:52,419 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 79 treesize of output 78 [2021-11-25 20:45:52,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:52,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:45:52,539 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:45:52,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:45:53,519 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:45:59,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107455#(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 [2021-11-25 20:45:59,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:45:59,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:45:59,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 14] total 43 [2021-11-25 20:45:59,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004330316] [2021-11-25 20:45:59,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:45:59,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:45:59,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:45:59,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:45:59,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2021-11-25 20:45:59,282 INFO L87 Difference]: Start difference. First operand 615 states and 701 transitions. Second operand has 44 states, 43 states have (on average 3.6744186046511627) internal successors, (158), 44 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:02,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:02,427 INFO L93 Difference]: Finished difference Result 2048 states and 2322 transitions. [2021-11-25 20:46:02,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 20:46:02,428 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 3.6744186046511627) internal successors, (158), 44 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-25 20:46:02,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:02,430 INFO L225 Difference]: With dead ends: 2048 [2021-11-25 20:46:02,430 INFO L226 Difference]: Without dead ends: 2048 [2021-11-25 20:46:02,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2972 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=2096, Invalid=11244, Unknown=0, NotChecked=0, Total=13340 [2021-11-25 20:46:02,431 INFO L933 BasicCegarLoop]: 158 mSDtfsCounter, 573 mSDsluCounter, 1786 mSDsCounter, 0 mSdLazyCounter, 2309 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 573 SdHoareTripleChecker+Valid, 1806 SdHoareTripleChecker+Invalid, 2374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 2309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:02,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [573 Valid, 1806 Invalid, 2374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 2309 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 20:46:02,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2048 states. [2021-11-25 20:46:02,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2048 to 997. [2021-11-25 20:46:02,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 997 states, 995 states have (on average 1.1477386934673366) internal successors, (1142), 996 states have internal predecessors, (1142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:02,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 997 states to 997 states and 1142 transitions. [2021-11-25 20:46:02,441 INFO L78 Accepts]: Start accepts. Automaton has 997 states and 1142 transitions. Word has length 75 [2021-11-25 20:46:02,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:02,442 INFO L470 AbstractCegarLoop]: Abstraction has 997 states and 1142 transitions. [2021-11-25 20:46:02,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 3.6744186046511627) internal successors, (158), 44 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:02,442 INFO L276 IsEmpty]: Start isEmpty. Operand 997 states and 1142 transitions. [2021-11-25 20:46:02,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-25 20:46:02,443 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:02,443 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 4, 4, 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] [2021-11-25 20:46:02,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:02,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:02,643 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:46:02,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:02,644 INFO L85 PathProgramCache]: Analyzing trace with hash 1483662532, now seen corresponding path program 2 times [2021-11-25 20:46:02,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:02,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136386072] [2021-11-25 20:46:02,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:02,644 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:02,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:03,072 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 17 proven. 92 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 20:46:03,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:03,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136386072] [2021-11-25 20:46:03,072 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136386072] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:03,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989263494] [2021-11-25 20:46:03,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:46:03,072 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:03,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:03,073 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:03,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-25 20:46:03,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 20:46:03,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:46:03,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-25 20:46:03,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:03,360 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 20:46:03,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-25 20:46:03,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-25 20:46:03,525 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 [2021-11-25 20:46:03,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 20 [2021-11-25 20:46:03,724 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:46:03,724 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 21 treesize of output 21 [2021-11-25 20:46:03,829 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 5 proven. 22 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-25 20:46:03,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:04,560 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:46:04,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2021-11-25 20:46:04,566 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:46:04,566 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 37 treesize of output 37 [2021-11-25 20:46:04,570 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 11 treesize of output 7 [2021-11-25 20:46:04,960 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2021-11-25 20:46:04,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989263494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:04,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [47820888] [2021-11-25 20:46:04,961 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-25 20:46:04,961 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:04,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:04,961 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:04,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:04,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:04,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:46:05,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:05,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:05,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:46:05,111 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:46:05,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 79 treesize of output 78 [2021-11-25 20:46:05,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:05,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:05,226 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:46:05,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:46:08,176 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:16,684 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '111113#(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 [2021-11-25 20:46:16,684 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:16,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:16,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 7, 7] total 34 [2021-11-25 20:46:16,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549492432] [2021-11-25 20:46:16,685 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:16,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 20:46:16,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:16,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 20:46:16,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=3654, Unknown=12, NotChecked=0, Total=3906 [2021-11-25 20:46:16,686 INFO L87 Difference]: Start difference. First operand 997 states and 1142 transitions. Second operand has 35 states, 35 states have (on average 4.171428571428572) internal successors, (146), 34 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:19,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:19,336 INFO L93 Difference]: Finished difference Result 2005 states and 2276 transitions. [2021-11-25 20:46:19,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-25 20:46:19,336 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 4.171428571428572) internal successors, (146), 34 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2021-11-25 20:46:19,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:19,339 INFO L225 Difference]: With dead ends: 2005 [2021-11-25 20:46:19,339 INFO L226 Difference]: Without dead ends: 1560 [2021-11-25 20:46:19,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2404 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=868, Invalid=9422, Unknown=12, NotChecked=0, Total=10302 [2021-11-25 20:46:19,341 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 585 mSDsluCounter, 1047 mSDsCounter, 0 mSdLazyCounter, 1561 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 585 SdHoareTripleChecker+Valid, 927 SdHoareTripleChecker+Invalid, 1667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 1561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:19,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [585 Valid, 927 Invalid, 1667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 1561 Invalid, 0 Unknown, 42 Unchecked, 0.8s Time] [2021-11-25 20:46:19,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1560 states. [2021-11-25 20:46:19,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1560 to 788. [2021-11-25 20:46:19,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 788 states, 787 states have (on average 1.1372299872935197) internal successors, (895), 787 states have internal predecessors, (895), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:19,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 788 states to 788 states and 895 transitions. [2021-11-25 20:46:19,355 INFO L78 Accepts]: Start accepts. Automaton has 788 states and 895 transitions. Word has length 77 [2021-11-25 20:46:19,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:19,356 INFO L470 AbstractCegarLoop]: Abstraction has 788 states and 895 transitions. [2021-11-25 20:46:19,356 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 4.171428571428572) internal successors, (146), 34 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:19,356 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 895 transitions. [2021-11-25 20:46:19,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 20:46:19,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:19,357 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:19,392 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:19,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable75 [2021-11-25 20:46:19,582 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:46:19,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:19,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1266662360, now seen corresponding path program 6 times [2021-11-25 20:46:19,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:19,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794044707] [2021-11-25 20:46:19,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:19,583 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:19,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:20,004 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 41 proven. 83 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 20:46:20,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:20,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794044707] [2021-11-25 20:46:20,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [794044707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:20,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270185162] [2021-11-25 20:46:20,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:46:20,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:20,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:20,007 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:20,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-25 20:46:20,291 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:46:20,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:46:20,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 162 conjunts are in the unsatisfiable core [2021-11-25 20:46:20,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:20,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-25 20:46:20,955 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 20:46:20,955 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 10 [2021-11-25 20:46:20,990 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 14 proven. 111 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 20:46:20,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:24,203 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 14 proven. 76 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 20:46:24,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270185162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:24,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750640618] [2021-11-25 20:46:24,204 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:46:24,204 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:24,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:24,204 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:24,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:24,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:24,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:46:24,257 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 14 treesize of output 10 [2021-11-25 20:46:24,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:24,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:46:24,363 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:46:24,363 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 79 treesize of output 78 [2021-11-25 20:46:24,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:24,424 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 14 treesize of output 10 [2021-11-25 20:46:24,458 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:46:24,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:46:25,552 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:33,007 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '114558#(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 [2021-11-25 20:46:33,007 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:33,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:33,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 66 [2021-11-25 20:46:33,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85615397] [2021-11-25 20:46:33,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:33,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-25 20:46:33,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:33,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-25 20:46:33,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=7530, Unknown=1, NotChecked=0, Total=7832 [2021-11-25 20:46:33,009 INFO L87 Difference]: Start difference. First operand 788 states and 895 transitions. Second operand has 66 states, 66 states have (on average 2.8181818181818183) internal successors, (186), 66 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:37,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:37,472 INFO L93 Difference]: Finished difference Result 2394 states and 2668 transitions. [2021-11-25 20:46:37,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-25 20:46:37,472 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.8181818181818183) internal successors, (186), 66 states have internal predecessors, (186), 0 states have call successors, (0), 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 81 [2021-11-25 20:46:37,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:37,474 INFO L225 Difference]: With dead ends: 2394 [2021-11-25 20:46:37,474 INFO L226 Difference]: Without dead ends: 1533 [2021-11-25 20:46:37,475 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 5011 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=1270, Invalid=19899, Unknown=1, NotChecked=0, Total=21170 [2021-11-25 20:46:37,475 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 1290 mSDsluCounter, 2730 mSDsCounter, 0 mSdLazyCounter, 2932 mSolverCounterSat, 220 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1290 SdHoareTripleChecker+Valid, 2653 SdHoareTripleChecker+Invalid, 3672 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 2932 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 520 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:37,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1290 Valid, 2653 Invalid, 3672 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [220 Valid, 2932 Invalid, 0 Unknown, 520 Unchecked, 1.4s Time] [2021-11-25 20:46:37,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1533 states. [2021-11-25 20:46:37,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1533 to 978. [2021-11-25 20:46:37,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 978 states, 977 states have (on average 1.13510747185261) internal successors, (1109), 977 states have internal predecessors, (1109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:37,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 978 states to 978 states and 1109 transitions. [2021-11-25 20:46:37,486 INFO L78 Accepts]: Start accepts. Automaton has 978 states and 1109 transitions. Word has length 81 [2021-11-25 20:46:37,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:37,486 INFO L470 AbstractCegarLoop]: Abstraction has 978 states and 1109 transitions. [2021-11-25 20:46:37,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.8181818181818183) internal successors, (186), 66 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:37,486 INFO L276 IsEmpty]: Start isEmpty. Operand 978 states and 1109 transitions. [2021-11-25 20:46:37,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-25 20:46:37,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:37,487 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:37,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:37,690 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:37,690 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:46:37,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:37,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1992335108, now seen corresponding path program 2 times [2021-11-25 20:46:37,691 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:37,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364698884] [2021-11-25 20:46:37,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:37,691 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:37,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:37,878 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 29 proven. 40 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 20:46:37,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:37,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364698884] [2021-11-25 20:46:37,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364698884] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:37,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601559245] [2021-11-25 20:46:37,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:46:37,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:37,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:37,883 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:37,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-25 20:46:38,242 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 20:46:38,242 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:46:38,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-25 20:46:38,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:38,506 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 29 proven. 40 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 20:46:38,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:38,930 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 29 proven. 40 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 20:46:38,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601559245] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:38,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742065921] [2021-11-25 20:46:38,932 INFO L159 IcfgInterpreter]: Started Sifa with 30 locations of interest [2021-11-25 20:46:38,932 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:38,932 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:38,932 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:38,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:38,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:38,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:46:39,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:46:39,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:39,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:46:39,114 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:46:39,115 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 79 treesize of output 78 [2021-11-25 20:46:39,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:39,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:39,257 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:46:39,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:46:43,581 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:46:50,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118604#(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) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2021-11-25 20:46:50,804 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:46:50,805 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:46:50,805 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2021-11-25 20:46:50,805 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565721783] [2021-11-25 20:46:50,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:46:50,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 20:46:50,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:46:50,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 20:46:50,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2156, Unknown=0, NotChecked=0, Total=2352 [2021-11-25 20:46:50,806 INFO L87 Difference]: Start difference. First operand 978 states and 1109 transitions. Second operand has 22 states, 22 states have (on average 4.954545454545454) internal successors, (109), 22 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) [2021-11-25 20:46:51,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:46:51,160 INFO L93 Difference]: Finished difference Result 1309 states and 1444 transitions. [2021-11-25 20:46:51,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 20:46:51,160 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 4.954545454545454) internal successors, (109), 22 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) Word has length 85 [2021-11-25 20:46:51,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:46:51,161 INFO L225 Difference]: With dead ends: 1309 [2021-11-25 20:46:51,161 INFO L226 Difference]: Without dead ends: 523 [2021-11-25 20:46:51,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=240, Invalid=2622, Unknown=0, NotChecked=0, Total=2862 [2021-11-25 20:46:51,161 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 139 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:46:51,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 514 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:46:51,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-11-25 20:46:51,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 523. [2021-11-25 20:46:51,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 522 states have (on average 1.1226053639846743) internal successors, (586), 522 states have internal predecessors, (586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:46:51,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 586 transitions. [2021-11-25 20:46:51,167 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 586 transitions. Word has length 85 [2021-11-25 20:46:51,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:46:51,168 INFO L470 AbstractCegarLoop]: Abstraction has 523 states and 586 transitions. [2021-11-25 20:46:51,168 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 4.954545454545454) internal successors, (109), 22 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) [2021-11-25 20:46:51,168 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 586 transitions. [2021-11-25 20:46:51,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-25 20:46:51,169 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:46:51,169 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:46:51,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-25 20:46:51,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-11-25 20:46:51,371 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:46:51,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:46:51,371 INFO L85 PathProgramCache]: Analyzing trace with hash 850751272, now seen corresponding path program 7 times [2021-11-25 20:46:51,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:46:51,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319601175] [2021-11-25 20:46:51,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:46:51,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:46:51,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:51,711 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 25 proven. 94 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 20:46:51,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:46:51,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319601175] [2021-11-25 20:46:51,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319601175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:46:51,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051061845] [2021-11-25 20:46:51,712 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:46:51,712 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:46:51,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:46:51,713 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:46:51,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-25 20:46:51,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:46:51,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 613 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-25 20:46:51,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:46:52,356 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 42 proven. 77 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 20:46:52,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:46:52,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-25 20:46:52,864 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 42 proven. 77 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 20:46:52,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051061845] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:46:52,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921682153] [2021-11-25 20:46:52,865 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:46:52,865 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:46:52,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:46:52,866 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:46:52,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:46:52,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:52,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:46:52,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:52,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:52,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:53,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:46:53,015 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 83 treesize of output 75 [2021-11-25 20:46:53,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:46:53,064 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 14 treesize of output 10 [2021-11-25 20:46:53,094 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:46:53,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:46:54,208 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:00,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '121016#(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 [2021-11-25 20:47:00,588 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:00,588 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:00,588 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 38 [2021-11-25 20:47:00,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225746779] [2021-11-25 20:47:00,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:00,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-25 20:47:00,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:00,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-25 20:47:00,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=3494, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 20:47:00,589 INFO L87 Difference]: Start difference. First operand 523 states and 586 transitions. Second operand has 39 states, 38 states have (on average 3.6052631578947367) internal successors, (137), 39 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:01,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:01,915 INFO L93 Difference]: Finished difference Result 956 states and 1061 transitions. [2021-11-25 20:47:01,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-25 20:47:01,916 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.6052631578947367) internal successors, (137), 39 states have internal predecessors, (137), 0 states have call successors, (0), 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 85 [2021-11-25 20:47:01,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:01,917 INFO L225 Difference]: With dead ends: 956 [2021-11-25 20:47:01,917 INFO L226 Difference]: Without dead ends: 956 [2021-11-25 20:47:01,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 211 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1635 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=941, Invalid=6199, Unknown=0, NotChecked=0, Total=7140 [2021-11-25 20:47:01,918 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 629 mSDsluCounter, 790 mSDsCounter, 0 mSdLazyCounter, 1093 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 629 SdHoareTripleChecker+Valid, 746 SdHoareTripleChecker+Invalid, 1198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 1093 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:01,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [629 Valid, 746 Invalid, 1198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 1093 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 20:47:01,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 956 states. [2021-11-25 20:47:01,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 956 to 559. [2021-11-25 20:47:01,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 559 states, 558 states have (on average 1.1236559139784945) internal successors, (627), 558 states have internal predecessors, (627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:01,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 559 states to 559 states and 627 transitions. [2021-11-25 20:47:01,928 INFO L78 Accepts]: Start accepts. Automaton has 559 states and 627 transitions. Word has length 85 [2021-11-25 20:47:01,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:01,929 INFO L470 AbstractCegarLoop]: Abstraction has 559 states and 627 transitions. [2021-11-25 20:47:01,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.6052631578947367) internal successors, (137), 39 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:01,929 INFO L276 IsEmpty]: Start isEmpty. Operand 559 states and 627 transitions. [2021-11-25 20:47:01,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-25 20:47:01,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:01,930 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:01,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-25 20:47:02,154 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:02,154 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:47:02,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:02,155 INFO L85 PathProgramCache]: Analyzing trace with hash 914834161, now seen corresponding path program 8 times [2021-11-25 20:47:02,155 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:02,155 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790351893] [2021-11-25 20:47:02,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:02,155 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:02,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:02,442 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 102 proven. 36 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-25 20:47:02,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:02,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790351893] [2021-11-25 20:47:02,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790351893] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:02,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812976337] [2021-11-25 20:47:02,443 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:47:02,443 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:02,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:02,444 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:02,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-25 20:47:02,891 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-25 20:47:02,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:47:02,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-25 20:47:02,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:47:03,449 INFO L354 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2021-11-25 20:47:03,450 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 10 [2021-11-25 20:47:03,481 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-25 20:47:03,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:47:03,811 INFO L354 Elim1Store]: treesize reduction 4, result has 69.2 percent of original size [2021-11-25 20:47:03,811 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 18 treesize of output 17 [2021-11-25 20:47:03,884 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-25 20:47:03,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812976337] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:47:03,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1404904246] [2021-11-25 20:47:03,885 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:47:03,885 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:47:03,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:47:03,885 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:47:03,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:47:03,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:03,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:47:03,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 20:47:03,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:04,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:04,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:04,097 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 83 treesize of output 75 [2021-11-25 20:47:04,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:04,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:04,214 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:47:04,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:47:05,326 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:12,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '123184#(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 [2021-11-25 20:47:12,275 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:12,275 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:12,275 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 21] total 44 [2021-11-25 20:47:12,275 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18087889] [2021-11-25 20:47:12,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:12,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-25 20:47:12,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:12,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-25 20:47:12,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=4184, Unknown=0, NotChecked=0, Total=4422 [2021-11-25 20:47:12,277 INFO L87 Difference]: Start difference. First operand 559 states and 627 transitions. Second operand has 44 states, 44 states have (on average 3.3636363636363638) internal successors, (148), 44 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:16,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:16,417 INFO L93 Difference]: Finished difference Result 1632 states and 1785 transitions. [2021-11-25 20:47:16,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-25 20:47:16,417 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.3636363636363638) internal successors, (148), 44 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2021-11-25 20:47:16,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:16,418 INFO L225 Difference]: With dead ends: 1632 [2021-11-25 20:47:16,418 INFO L226 Difference]: Without dead ends: 281 [2021-11-25 20:47:16,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 228 SyntacticMatches, 2 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 4740 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=1489, Invalid=16601, Unknown=0, NotChecked=0, Total=18090 [2021-11-25 20:47:16,419 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 829 mSDsluCounter, 2946 mSDsCounter, 0 mSdLazyCounter, 3722 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 829 SdHoareTripleChecker+Valid, 2732 SdHoareTripleChecker+Invalid, 4121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 3722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 225 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:16,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [829 Valid, 2732 Invalid, 4121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 3722 Invalid, 0 Unknown, 225 Unchecked, 1.6s Time] [2021-11-25 20:47:16,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-11-25 20:47:16,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 178. [2021-11-25 20:47:16,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 1.1355932203389831) internal successors, (201), 177 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:16,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 201 transitions. [2021-11-25 20:47:16,421 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 201 transitions. Word has length 91 [2021-11-25 20:47:16,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:16,421 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 201 transitions. [2021-11-25 20:47:16,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.3636363636363638) internal successors, (148), 44 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:16,421 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 201 transitions. [2021-11-25 20:47:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-25 20:47:16,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:16,422 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:16,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-25 20:47:16,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:16,626 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:47:16,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:16,627 INFO L85 PathProgramCache]: Analyzing trace with hash -1599997205, now seen corresponding path program 9 times [2021-11-25 20:47:16,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:16,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689410272] [2021-11-25 20:47:16,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:16,627 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:16,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:16,878 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 42 proven. 49 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-11-25 20:47:16,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:16,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689410272] [2021-11-25 20:47:16,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689410272] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:16,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361712586] [2021-11-25 20:47:16,878 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:47:16,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:16,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:16,879 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:16,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-25 20:47:17,190 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:47:17,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:47:17,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-25 20:47:17,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:47:17,809 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 36 proven. 108 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-25 20:47:17,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:47:18,230 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-25 20:47:18,231 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 21 treesize of output 25 [2021-11-25 20:47:18,773 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 36 proven. 108 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-25 20:47:18,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361712586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:47:18,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [886150706] [2021-11-25 20:47:18,774 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:47:18,774 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:47:18,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:47:18,774 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:47:18,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:47:18,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:18,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:47:18,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:18,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:18,877 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 11 treesize of output 7 [2021-11-25 20:47:18,924 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-25 20:47:18,924 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 79 treesize of output 78 [2021-11-25 20:47:18,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:19,029 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 [2021-11-25 20:47:19,080 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:47:19,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:47:20,223 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:27,020 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125778#(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 [2021-11-25 20:47:27,020 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:27,021 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:27,021 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 57 [2021-11-25 20:47:27,021 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905832186] [2021-11-25 20:47:27,021 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:27,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-25 20:47:27,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:27,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-25 20:47:27,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=5700, Unknown=0, NotChecked=0, Total=6162 [2021-11-25 20:47:27,022 INFO L87 Difference]: Start difference. First operand 178 states and 201 transitions. Second operand has 57 states, 57 states have (on average 3.263157894736842) internal successors, (186), 57 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:29,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:47:29,336 INFO L93 Difference]: Finished difference Result 556 states and 628 transitions. [2021-11-25 20:47:29,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-25 20:47:29,336 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.263157894736842) internal successors, (186), 57 states have internal predecessors, (186), 0 states have call successors, (0), 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 95 [2021-11-25 20:47:29,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:47:29,337 INFO L225 Difference]: With dead ends: 556 [2021-11-25 20:47:29,337 INFO L226 Difference]: Without dead ends: 555 [2021-11-25 20:47:29,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 218 SyntacticMatches, 8 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4483 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=1536, Invalid=12270, Unknown=0, NotChecked=0, Total=13806 [2021-11-25 20:47:29,339 INFO L933 BasicCegarLoop]: 94 mSDtfsCounter, 764 mSDsluCounter, 1926 mSDsCounter, 0 mSdLazyCounter, 2079 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 764 SdHoareTripleChecker+Valid, 1845 SdHoareTripleChecker+Invalid, 2166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 2079 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:47:29,339 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [764 Valid, 1845 Invalid, 2166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 2079 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:47:29,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-11-25 20:47:29,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 251. [2021-11-25 20:47:29,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.14) internal successors, (285), 250 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:29,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 285 transitions. [2021-11-25 20:47:29,344 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 285 transitions. Word has length 95 [2021-11-25 20:47:29,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:47:29,344 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 285 transitions. [2021-11-25 20:47:29,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.263157894736842) internal successors, (186), 57 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:47:29,345 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 285 transitions. [2021-11-25 20:47:29,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:47:29,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:47:29,345 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:47:29,401 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-25 20:47:29,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:29,570 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 21 more)] === [2021-11-25 20:47:29,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:47:29,571 INFO L85 PathProgramCache]: Analyzing trace with hash 92454462, now seen corresponding path program 10 times [2021-11-25 20:47:29,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:47:29,571 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040306279] [2021-11-25 20:47:29,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:47:29,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:47:29,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:29,891 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 48 proven. 132 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2021-11-25 20:47:29,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:47:29,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040306279] [2021-11-25 20:47:29,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040306279] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 20:47:29,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267857094] [2021-11-25 20:47:29,892 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:47:29,892 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:47:29,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:47:29,895 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:47:29,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4598c00-12bf-42c9-9946-2048cba466d7/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-25 20:47:30,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:47:30,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 734 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-25 20:47:30,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:47:30,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:30,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:47:30,219 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 18 treesize of output 16 [2021-11-25 20:47:30,996 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 140 proven. 49 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-25 20:47:30,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:47:31,847 INFO L134 CoverageAnalysis]: Checked inductivity of 295 backedges. 140 proven. 49 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2021-11-25 20:47:31,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267857094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:47:31,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575829394] [2021-11-25 20:47:31,848 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2021-11-25 20:47:31,848 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:47:31,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:47:31,848 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:47:31,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:47:31,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:31,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-25 20:47:31,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:31,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:31,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:32,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:47:32,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 75 [2021-11-25 20:47:32,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:32,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-25 20:47:32,113 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-25 20:47:32,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-25 20:47:33,194 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:47:39,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '127354#(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 [2021-11-25 20:47:39,888 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:47:39,888 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 20:47:39,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 21] total 57 [2021-11-25 20:47:39,888 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013638544] [2021-11-25 20:47:39,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 20:47:39,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-25 20:47:39,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:47:39,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-25 20:47:39,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=5881, Unknown=0, NotChecked=0, Total=6320 [2021-11-25 20:47:39,889 INFO L87 Difference]: Start difference. First operand 251 states and 285 transitions. Second operand has 57 states, 57 states have (on average 4.035087719298246) internal successors, (230), 57 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)