./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P --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 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:21:43,706 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:21:43,708 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:21:43,763 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:21:43,763 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:21:43,765 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:21:43,769 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:21:43,777 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:21:43,780 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:21:43,789 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:21:43,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:21:43,792 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:21:43,792 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:21:43,795 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:21:43,799 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:21:43,806 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:21:43,810 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:21:43,811 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:21:43,813 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:21:43,816 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:21:43,818 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:21:43,823 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:21:43,826 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:21:43,828 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:21:43,844 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:21:43,844 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:21:43,845 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:21:43,847 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:21:43,847 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:21:43,849 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:21:43,850 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:21:43,851 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:21:43,853 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:21:43,854 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:21:43,855 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:21:43,856 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:21:43,856 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:21:43,857 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:21:43,857 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:21:43,858 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:21:43,858 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:21:43,859 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 00:21:43,913 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:21:43,920 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:21:43,920 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:21:43,920 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:21:43,921 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:21:43,921 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:21:43,921 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:21:43,922 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:21:43,922 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:21:43,922 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:21:43,922 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:21:43,922 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:21:43,922 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:21:43,923 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:21:43,923 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:21:43,923 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:21:43,923 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:21:43,923 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:21:43,924 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:21:43,924 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:21:43,925 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:21:43,925 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:21:43,925 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:21:43,925 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:21:43,926 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:21:43,926 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:21:43,926 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:21:43,926 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:21:43,927 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:21:43,927 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:21:43,928 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:21:43,928 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:21:43,928 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:21:43,928 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:21:43,928 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:21:43,929 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:21:43,930 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:21:43,930 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:21:43,930 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:21:43,930 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:21:43,930 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:21:43,931 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:21:43,931 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_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 71679b2a85162a2bf4315b62ab1893b5cfd06e20fc9e264973bd31bc9d08e300 [2021-11-21 00:21:44,299 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:21:44,343 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:21:44,345 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:21:44,347 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:21:44,348 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:21:44,349 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2021-11-21 00:21:44,446 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/data/f278cb571/062ff8d619884eedacee7dd1f0cc2658/FLAG399c8c242 [2021-11-21 00:21:45,039 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:21:45,040 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/sv-benchmarks/c/array-memsafety/cstrchr-alloca-2.i [2021-11-21 00:21:45,065 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/data/f278cb571/062ff8d619884eedacee7dd1f0cc2658/FLAG399c8c242 [2021-11-21 00:21:45,342 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/data/f278cb571/062ff8d619884eedacee7dd1f0cc2658 [2021-11-21 00:21:45,346 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:21:45,349 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:21:45,352 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:21:45,352 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:21:45,360 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:21:45,362 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,365 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35778f68 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45, skipping insertion in model container [2021-11-21 00:21:45,366 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,375 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:21:45,430 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:21:45,765 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:21:45,773 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:21:45,845 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:21:45,889 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:21:45,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45 WrapperNode [2021-11-21 00:21:45,890 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:21:45,892 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:21:45,893 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:21:45,893 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:21:45,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,931 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,965 INFO L137 Inliner]: procedures = 117, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 62 [2021-11-21 00:21:45,966 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:21:45,967 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:21:45,968 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:21:45,968 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:21:45,977 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,977 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:45,995 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:46,001 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:46,012 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:46,019 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:46,028 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:21:46,029 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:21:46,029 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:21:46,029 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:21:46,030 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (1/1) ... [2021-11-21 00:21:46,042 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:21:46,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:46,071 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:21:46,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:21:46,129 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:21:46,131 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:21:46,131 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:21:46,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:21:46,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:21:46,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:21:46,259 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:21:46,261 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:21:46,538 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:21:46,603 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:21:46,603 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:21:46,606 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:21:46 BoogieIcfgContainer [2021-11-21 00:21:46,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:21:46,608 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:21:46,608 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:21:46,612 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:21:46,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:21:45" (1/3) ... [2021-11-21 00:21:46,613 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26687bf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:21:46, skipping insertion in model container [2021-11-21 00:21:46,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:21:45" (2/3) ... [2021-11-21 00:21:46,614 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26687bf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:21:46, skipping insertion in model container [2021-11-21 00:21:46,614 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:21:46" (3/3) ... [2021-11-21 00:21:46,616 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrchr-alloca-2.i [2021-11-21 00:21:46,622 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:21:46,622 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 11 error locations. [2021-11-21 00:21:46,673 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:21:46,681 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 [2021-11-21 00:21:46,682 INFO L340 AbstractCegarLoop]: Starting to check reachability of 11 error locations. [2021-11-21 00:21:46,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 10 states have (on average 2.5) internal successors, (25), 21 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) [2021-11-21 00:21:46,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:21:46,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:46,704 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:21:46,705 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:46,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:46,711 INFO L85 PathProgramCache]: Analyzing trace with hash 112983, now seen corresponding path program 1 times [2021-11-21 00:21:46,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:46,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613144108] [2021-11-21 00:21:46,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:46,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:46,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:46,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:46,904 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:46,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613144108] [2021-11-21 00:21:46,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613144108] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:46,906 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:46,906 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:21:46,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391124442] [2021-11-21 00:21:46,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:46,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:46,914 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:46,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:46,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:46,966 INFO L87 Difference]: Start difference. First operand has 22 states, 10 states have (on average 2.5) internal successors, (25), 21 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) 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) [2021-11-21 00:21:47,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:47,047 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-11-21 00:21:47,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:47,051 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 [2021-11-21 00:21:47,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:47,060 INFO L225 Difference]: With dead ends: 20 [2021-11-21 00:21:47,060 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 00:21:47,063 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 [2021-11-21 00:21:47,068 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:47,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 9 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:47,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 00:21:47,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-21 00:21:47,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 10 states have (on average 2.1) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-11-21 00:21:47,107 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 3 [2021-11-21 00:21:47,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:47,108 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-11-21 00:21:47,108 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) [2021-11-21 00:21:47,109 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-11-21 00:21:47,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:21:47,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:47,109 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:21:47,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:21:47,111 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:47,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:47,116 INFO L85 PathProgramCache]: Analyzing trace with hash 112984, now seen corresponding path program 1 times [2021-11-21 00:21:47,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:47,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994265962] [2021-11-21 00:21:47,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:47,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:47,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:47,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:47,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:47,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994265962] [2021-11-21 00:21:47,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994265962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:47,257 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:47,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:47,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829299495] [2021-11-21 00:21:47,258 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:47,259 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:21:47,259 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:47,260 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:21:47,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:21:47,261 INFO L87 Difference]: Start difference. First operand 19 states and 21 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) [2021-11-21 00:21:47,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:47,347 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-11-21 00:21:47,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:21:47,347 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 [2021-11-21 00:21:47,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:47,348 INFO L225 Difference]: With dead ends: 18 [2021-11-21 00:21:47,348 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 00:21:47,349 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 [2021-11-21 00:21:47,351 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 18 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:47,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 16 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:47,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 00:21:47,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-21 00:21:47,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 10 states have (on average 2.0) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-21 00:21:47,356 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 3 [2021-11-21 00:21:47,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:47,357 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-21 00:21:47,357 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) [2021-11-21 00:21:47,357 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-21 00:21:47,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:21:47,358 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:47,358 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:21:47,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:21:47,359 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:47,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:47,360 INFO L85 PathProgramCache]: Analyzing trace with hash 115163, now seen corresponding path program 1 times [2021-11-21 00:21:47,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:47,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467840314] [2021-11-21 00:21:47,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:47,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:47,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:47,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:47,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:47,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467840314] [2021-11-21 00:21:47,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467840314] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:47,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:47,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:21:47,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374848480] [2021-11-21 00:21:47,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:47,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:47,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:47,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:47,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:47,481 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. 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) [2021-11-21 00:21:47,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:47,524 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2021-11-21 00:21:47,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:47,525 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 [2021-11-21 00:21:47,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:47,527 INFO L225 Difference]: With dead ends: 17 [2021-11-21 00:21:47,527 INFO L226 Difference]: Without dead ends: 17 [2021-11-21 00:21:47,528 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 [2021-11-21 00:21:47,532 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:47,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 8 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:47,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-21 00:21:47,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-21 00:21:47,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.9) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-21 00:21:47,544 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 3 [2021-11-21 00:21:47,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:47,544 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-21 00:21:47,545 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) [2021-11-21 00:21:47,545 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-21 00:21:47,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:21:47,547 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:47,547 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:21:47,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:21:47,548 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:47,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:47,550 INFO L85 PathProgramCache]: Analyzing trace with hash 3571639, now seen corresponding path program 1 times [2021-11-21 00:21:47,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:47,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218970668] [2021-11-21 00:21:47,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:47,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:47,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:47,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:47,616 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:47,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218970668] [2021-11-21 00:21:47,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218970668] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:47,617 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:47,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:47,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363421950] [2021-11-21 00:21:47,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:47,619 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:47,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:47,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:47,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:47,622 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:47,652 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2021-11-21 00:21:47,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:47,652 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-21 00:21:47,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:47,654 INFO L225 Difference]: With dead ends: 14 [2021-11-21 00:21:47,654 INFO L226 Difference]: Without dead ends: 14 [2021-11-21 00:21:47,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:47,666 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:47,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 6 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:47,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-21 00:21:47,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-21 00:21:47,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.6) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-21 00:21:47,674 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 4 [2021-11-21 00:21:47,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:47,674 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-21 00:21:47,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,675 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-21 00:21:47,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 00:21:47,675 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:47,675 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 00:21:47,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:21:47,676 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:47,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:47,679 INFO L85 PathProgramCache]: Analyzing trace with hash 3571640, now seen corresponding path program 1 times [2021-11-21 00:21:47,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:47,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105476040] [2021-11-21 00:21:47,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:47,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:47,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:47,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:47,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:47,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105476040] [2021-11-21 00:21:47,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105476040] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:47,765 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:47,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:47,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486450790] [2021-11-21 00:21:47,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:47,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:21:47,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:47,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:21:47,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:21:47,768 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:47,824 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2021-11-21 00:21:47,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:21:47,824 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-11-21 00:21:47,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:47,826 INFO L225 Difference]: With dead ends: 21 [2021-11-21 00:21:47,826 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 00:21:47,827 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 [2021-11-21 00:21:47,833 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 28 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:47,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 13 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:47,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 00:21:47,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-11-21 00:21:47,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-21 00:21:47,844 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 4 [2021-11-21 00:21:47,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:47,845 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-21 00:21:47,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,846 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-21 00:21:47,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:21:47,851 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:47,852 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:47,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:21:47,853 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:47,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:47,854 INFO L85 PathProgramCache]: Analyzing trace with hash -970335837, now seen corresponding path program 1 times [2021-11-21 00:21:47,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:47,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084631031] [2021-11-21 00:21:47,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:47,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:47,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:47,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:47,910 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:47,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084631031] [2021-11-21 00:21:47,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084631031] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:47,927 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:47,927 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:21:47,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259182485] [2021-11-21 00:21:47,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:47,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:21:47,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:47,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:21:47,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:47,929 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:47,948 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2021-11-21 00:21:47,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:21:47,949 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-11-21 00:21:47,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:47,949 INFO L225 Difference]: With dead ends: 21 [2021-11-21 00:21:47,950 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 00:21:47,950 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:21:47,951 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:47,951 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:47,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 00:21:47,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 00:21:47,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 20 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) [2021-11-21 00:21:47,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-21 00:21:47,968 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 7 [2021-11-21 00:21:47,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:47,968 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-21 00:21:47,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:47,969 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-21 00:21:47,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:21:47,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:47,969 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:47,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:21:47,970 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:47,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:47,970 INFO L85 PathProgramCache]: Analyzing trace with hash -15797907, now seen corresponding path program 1 times [2021-11-21 00:21:47,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:47,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100685956] [2021-11-21 00:21:47,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:47,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:47,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:48,110 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:48,111 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:48,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100685956] [2021-11-21 00:21:48,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [100685956] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:48,111 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:48,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 00:21:48,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143974630] [2021-11-21 00:21:48,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:48,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:21:48,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:48,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:21:48,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:21:48,113 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:48,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:48,207 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-11-21 00:21:48,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:21:48,208 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:21:48,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:48,210 INFO L225 Difference]: With dead ends: 30 [2021-11-21 00:21:48,210 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 00:21:48,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:21:48,212 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:48,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 27 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:48,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 00:21:48,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2021-11-21 00:21:48,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:48,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-11-21 00:21:48,229 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 8 [2021-11-21 00:21:48,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:48,229 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-11-21 00:21:48,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:48,236 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-11-21 00:21:48,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 00:21:48,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:48,236 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:48,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 00:21:48,251 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:48,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:48,252 INFO L85 PathProgramCache]: Analyzing trace with hash -15640301, now seen corresponding path program 1 times [2021-11-21 00:21:48,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:48,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193439853] [2021-11-21 00:21:48,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:48,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:48,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:48,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:48,360 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:48,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193439853] [2021-11-21 00:21:48,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193439853] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:21:48,360 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:21:48,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:21:48,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038295728] [2021-11-21 00:21:48,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:21:48,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:21:48,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:48,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:21:48,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:21:48,363 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:48,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:48,380 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2021-11-21 00:21:48,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:21:48,383 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 00:21:48,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:48,383 INFO L225 Difference]: With dead ends: 24 [2021-11-21 00:21:48,384 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 00:21:48,384 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 [2021-11-21 00:21:48,385 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:48,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 16 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:21:48,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 00:21:48,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-21 00:21:48,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:48,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-21 00:21:48,389 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 8 [2021-11-21 00:21:48,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:48,389 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-21 00:21:48,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:48,390 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-21 00:21:48,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 00:21:48,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:48,391 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:48,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:21:48,391 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:48,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:48,392 INFO L85 PathProgramCache]: Analyzing trace with hash -635776014, now seen corresponding path program 1 times [2021-11-21 00:21:48,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:48,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637090256] [2021-11-21 00:21:48,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:48,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:48,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:48,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:48,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:48,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637090256] [2021-11-21 00:21:48,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637090256] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:48,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558145826] [2021-11-21 00:21:48,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:48,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:48,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:48,512 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:48,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:21:48,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:48,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:21:48,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:48,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:48,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:48,973 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 [2021-11-21 00:21:49,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:49,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558145826] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:49,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [375018669] [2021-11-21 00:21:49,020 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:21:49,020 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:49,025 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:49,031 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:49,031 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:49,131 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 6 treesize of output 5 [2021-11-21 00:21:49,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:21:49,670 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:21:49,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:21:50,057 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 23 treesize of output 19 [2021-11-21 00:21:50,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:21:52,967 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:53,711 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:53,712 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:53,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 11 [2021-11-21 00:21:53,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816535506] [2021-11-21 00:21:53,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:53,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:21:53,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:53,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:21:53,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2021-11-21 00:21:53,714 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 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) [2021-11-21 00:21:53,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:53,853 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-11-21 00:21:53,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:21:53,854 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 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 10 [2021-11-21 00:21:53,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:53,854 INFO L225 Difference]: With dead ends: 22 [2021-11-21 00:21:53,855 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 00:21:53,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2021-11-21 00:21:53,859 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 50 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:53,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 13 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:53,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 00:21:53,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2021-11-21 00:21:53,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:53,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-21 00:21:53,863 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2021-11-21 00:21:53,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:53,864 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-21 00:21:53,864 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 12 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) [2021-11-21 00:21:53,864 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-21 00:21:53,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 00:21:53,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:53,865 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 00:21:53,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:21:54,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 00:21:54,079 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:54,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:54,079 INFO L85 PathProgramCache]: Analyzing trace with hash -371550041, now seen corresponding path program 2 times [2021-11-21 00:21:54,079 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:54,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344739345] [2021-11-21 00:21:54,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:54,080 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:54,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:54,290 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:54,290 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:54,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344739345] [2021-11-21 00:21:54,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344739345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:54,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182499952] [2021-11-21 00:21:54,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:21:54,291 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:54,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:54,292 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:54,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:21:54,359 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:21:54,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:21:54,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:21:54,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:54,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:21:54,661 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-21 00:21:54,661 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 38 treesize of output 26 [2021-11-21 00:21:54,682 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:54,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:54,760 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 [2021-11-21 00:21:54,764 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 [2021-11-21 00:21:54,870 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:54,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182499952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:54,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399809142] [2021-11-21 00:21:54,873 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:21:54,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:54,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:54,874 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:54,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:54,946 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 6 treesize of output 5 [2021-11-21 00:21:55,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:21:55,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:55,414 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 136 treesize of output 128 [2021-11-21 00:21:55,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:21:55,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:21:58,356 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:59,126 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:59,126 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:59,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-21 00:21:59,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305031934] [2021-11-21 00:21:59,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:59,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 00:21:59,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:59,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 00:21:59,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=612, Unknown=0, NotChecked=0, Total=702 [2021-11-21 00:21:59,128 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:59,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:21:59,387 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-11-21 00:21:59,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 00:21:59,387 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 00:21:59,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:21:59,388 INFO L225 Difference]: With dead ends: 25 [2021-11-21 00:21:59,388 INFO L226 Difference]: Without dead ends: 18 [2021-11-21 00:21:59,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=170, Invalid=952, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:21:59,389 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 28 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:21:59,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 19 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:21:59,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-21 00:21:59,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-11-21 00:21:59,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:59,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-11-21 00:21:59,393 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-11-21 00:21:59,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:21:59,394 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-11-21 00:21:59,394 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:21:59,394 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-11-21 00:21:59,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:21:59,395 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:21:59,395 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2021-11-21 00:21:59,418 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-21 00:21:59,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:21:59,615 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:21:59,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:21:59,615 INFO L85 PathProgramCache]: Analyzing trace with hash -862862484, now seen corresponding path program 3 times [2021-11-21 00:21:59,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:21:59,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15099465] [2021-11-21 00:21:59,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:21:59,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:21:59,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:59,753 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:21:59,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:59,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15099465] [2021-11-21 00:21:59,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15099465] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:59,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561499588] [2021-11-21 00:21:59,754 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:21:59,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:59,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:59,763 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:59,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:21:59,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:21:59,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:21:59,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:21:59,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:59,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:22:00,027 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:00,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:00,279 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:00,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561499588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:00,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620527383] [2021-11-21 00:22:00,282 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:00,282 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:00,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:00,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:00,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:00,347 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 6 treesize of output 5 [2021-11-21 00:22:00,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:22:00,742 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:00,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:00,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:01,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:03,443 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:04,005 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:04,006 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:04,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 19 [2021-11-21 00:22:04,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691892833] [2021-11-21 00:22:04,006 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:04,006 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-21 00:22:04,006 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:04,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-21 00:22:04,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:22:04,008 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 21 states, 20 states have (on average 2.3) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:04,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:04,174 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-11-21 00:22:04,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 00:22:04,175 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.3) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:22:04,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:04,175 INFO L225 Difference]: With dead ends: 24 [2021-11-21 00:22:04,175 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 00:22:04,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=177, Invalid=879, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:22:04,177 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 61 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:04,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 16 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:04,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 00:22:04,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-11-21 00:22:04,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.1) internal successors, (22), 20 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) [2021-11-21 00:22:04,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-11-21 00:22:04,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2021-11-21 00:22:04,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:04,180 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-11-21 00:22:04,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.3) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:04,181 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-11-21 00:22:04,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-21 00:22:04,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:04,182 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1] [2021-11-21 00:22:04,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:04,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:04,387 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:04,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:04,388 INFO L85 PathProgramCache]: Analyzing trace with hash -537314527, now seen corresponding path program 4 times [2021-11-21 00:22:04,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:04,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578869025] [2021-11-21 00:22:04,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:04,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:04,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:04,534 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:04,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:04,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578869025] [2021-11-21 00:22:04,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578869025] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:04,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625075514] [2021-11-21 00:22:04,535 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:22:04,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:04,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:04,536 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:04,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:22:04,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:04,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-21 00:22:04,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:04,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-21 00:22:04,953 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:04,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:05,045 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 22 treesize of output 20 [2021-11-21 00:22:05,050 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 [2021-11-21 00:22:05,338 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:05,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625075514] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:05,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1647819854] [2021-11-21 00:22:05,340 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:05,340 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:05,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:05,341 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:05,341 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:05,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:22:05,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:05,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:05,773 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 136 treesize of output 128 [2021-11-21 00:22:05,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:06,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:08,288 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:09,057 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:09,058 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:09,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 25 [2021-11-21 00:22:09,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008277368] [2021-11-21 00:22:09,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:09,059 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 00:22:09,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:09,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 00:22:09,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=947, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:22:09,061 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 25 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:09,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:09,326 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2021-11-21 00:22:09,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:22:09,326 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 25 states have internal predecessors, (45), 0 states have call successors, (0), 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 [2021-11-21 00:22:09,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:09,327 INFO L225 Difference]: With dead ends: 35 [2021-11-21 00:22:09,327 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 00:22:09,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=187, Invalid=1373, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 00:22:09,329 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 60 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:09,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 31 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 186 Invalid, 0 Unknown, 16 Unchecked, 0.1s Time] [2021-11-21 00:22:09,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 00:22:09,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-11-21 00:22:09,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 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) [2021-11-21 00:22:09,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-21 00:22:09,333 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-11-21 00:22:09,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:09,334 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-21 00:22:09,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7307692307692308) internal successors, (45), 25 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:09,334 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-21 00:22:09,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 00:22:09,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:09,335 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1] [2021-11-21 00:22:09,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:09,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:09,547 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:09,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:09,548 INFO L85 PathProgramCache]: Analyzing trace with hash 408190502, now seen corresponding path program 5 times [2021-11-21 00:22:09,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:09,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787932534] [2021-11-21 00:22:09,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:09,548 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:09,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:09,704 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:09,705 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:09,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787932534] [2021-11-21 00:22:09,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1787932534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:09,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155320903] [2021-11-21 00:22:09,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:22:09,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:09,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:09,707 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:09,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:22:09,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 00:22:09,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:09,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:22:09,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:09,949 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:09,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:10,132 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 [2021-11-21 00:22:10,158 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:10,158 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155320903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:10,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1977318223] [2021-11-21 00:22:10,162 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:10,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:10,163 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:10,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:10,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:10,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:22:10,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:22:10,557 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:10,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:10,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:10,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:13,011 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:13,621 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:13,621 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:13,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 22 [2021-11-21 00:22:13,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867180175] [2021-11-21 00:22:13,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:13,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 00:22:13,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:13,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 00:22:13,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:22:13,624 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 24 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 23 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:13,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:13,826 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2021-11-21 00:22:13,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-21 00:22:13,827 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 23 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-21 00:22:13,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:13,827 INFO L225 Difference]: With dead ends: 30 [2021-11-21 00:22:13,827 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 00:22:13,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=232, Invalid=1100, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:22:13,829 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 108 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:13,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 15 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:13,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 00:22:13,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2021-11-21 00:22:13,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 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) [2021-11-21 00:22:13,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-21 00:22:13,832 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2021-11-21 00:22:13,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:13,833 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-21 00:22:13,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 23 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:13,833 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-21 00:22:13,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 00:22:13,834 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:13,834 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1] [2021-11-21 00:22:13,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:14,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:22:14,063 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:14,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:14,063 INFO L85 PathProgramCache]: Analyzing trace with hash -1039398693, now seen corresponding path program 6 times [2021-11-21 00:22:14,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:14,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699383178] [2021-11-21 00:22:14,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:14,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:14,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:14,249 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:14,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699383178] [2021-11-21 00:22:14,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699383178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:14,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870434654] [2021-11-21 00:22:14,249 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:22:14,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:14,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:14,261 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:14,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:22:14,320 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:22:14,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:14,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 00:22:14,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:14,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:22:14,596 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:14,670 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 [2021-11-21 00:22:14,672 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 [2021-11-21 00:22:14,779 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:14,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870434654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:14,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1928070761] [2021-11-21 00:22:14,782 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:14,782 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:14,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:14,783 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:14,783 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:14,839 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 6 treesize of output 5 [2021-11-21 00:22:14,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:22:15,127 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:15,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:15,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:15,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:17,688 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:18,334 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:18,334 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:18,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2021-11-21 00:22:18,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698766234] [2021-11-21 00:22:18,335 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:18,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-21 00:22:18,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:18,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-21 00:22:18,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=778, Unknown=0, NotChecked=0, Total=870 [2021-11-21 00:22:18,337 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 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) [2021-11-21 00:22:18,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:18,675 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2021-11-21 00:22:18,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 00:22:18,676 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 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 26 [2021-11-21 00:22:18,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:18,676 INFO L225 Difference]: With dead ends: 45 [2021-11-21 00:22:18,677 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 00:22:18,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=174, Invalid=1308, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:22:18,678 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 48 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:18,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 58 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:22:18,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 00:22:18,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-11-21 00:22:18,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:18,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-11-21 00:22:18,682 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2021-11-21 00:22:18,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:18,683 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-11-21 00:22:18,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 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) [2021-11-21 00:22:18,683 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-11-21 00:22:18,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 00:22:18,684 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:18,684 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1] [2021-11-21 00:22:18,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:18,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:18,885 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:18,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:18,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1411920928, now seen corresponding path program 7 times [2021-11-21 00:22:18,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:18,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826122090] [2021-11-21 00:22:18,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:18,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:18,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:19,061 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:19,062 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:19,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826122090] [2021-11-21 00:22:19,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826122090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:19,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796170732] [2021-11-21 00:22:19,062 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:22:19,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:19,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:19,064 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:19,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:22:19,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:19,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-21 00:22:19,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:19,307 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:19,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:19,488 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 5 treesize of output 3 [2021-11-21 00:22:19,525 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:19,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796170732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:19,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [315455864] [2021-11-21 00:22:19,527 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:19,527 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:19,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:19,528 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:19,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:19,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:22:19,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:22:19,849 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:19,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:20,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:20,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:22,206 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:22,818 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:22,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:22,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 23 [2021-11-21 00:22:22,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94680724] [2021-11-21 00:22:22,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:22,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:22:22,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:22,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:22:22,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:22:22,820 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 25 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 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) [2021-11-21 00:22:23,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:23,074 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2021-11-21 00:22:23,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:22:23,075 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 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) Word has length 28 [2021-11-21 00:22:23,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:23,075 INFO L225 Difference]: With dead ends: 36 [2021-11-21 00:22:23,075 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:22:23,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=248, Invalid=1234, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:22:23,077 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 149 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:23,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 42 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:22:23,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:22:23,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2021-11-21 00:22:23,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:23,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-11-21 00:22:23,081 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 28 [2021-11-21 00:22:23,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:23,081 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-11-21 00:22:23,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 24 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) [2021-11-21 00:22:23,082 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-11-21 00:22:23,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-21 00:22:23,083 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:23,083 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1] [2021-11-21 00:22:23,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:23,286 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:22:23,290 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:23,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:23,291 INFO L85 PathProgramCache]: Analyzing trace with hash -524275243, now seen corresponding path program 8 times [2021-11-21 00:22:23,291 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:23,291 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546780770] [2021-11-21 00:22:23,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:23,291 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:23,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:23,516 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:23,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:23,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546780770] [2021-11-21 00:22:23,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546780770] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:23,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340563055] [2021-11-21 00:22:23,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:22:23,516 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:23,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:23,517 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:23,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:22:23,586 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 00:22:23,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:23,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-21 00:22:23,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:23,743 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 21 treesize of output 17 [2021-11-21 00:22:23,884 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:23,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:23,952 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 [2021-11-21 00:22:23,954 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 [2021-11-21 00:22:24,065 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:24,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340563055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:24,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2102716436] [2021-11-21 00:22:24,067 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:24,068 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:24,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:24,068 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:24,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:24,105 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 6 treesize of output 5 [2021-11-21 00:22:24,176 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 20 treesize of output 16 [2021-11-21 00:22:24,400 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:24,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:24,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:24,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:26,782 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:27,406 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:27,406 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:27,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2021-11-21 00:22:27,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372115812] [2021-11-21 00:22:27,406 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:27,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 00:22:27,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:27,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 00:22:27,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=957, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:22:27,408 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:27,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:27,855 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2021-11-21 00:22:27,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:22:27,856 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-21 00:22:27,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:27,856 INFO L225 Difference]: With dead ends: 55 [2021-11-21 00:22:27,857 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:22:27,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=196, Invalid=1696, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 00:22:27,858 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 50 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:27,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 81 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:22:27,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:22:27,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-11-21 00:22:27,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:27,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-21 00:22:27,861 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2021-11-21 00:22:27,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:27,862 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-21 00:22:27,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:27,862 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-21 00:22:27,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-21 00:22:27,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:27,863 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1] [2021-11-21 00:22:27,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:28,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:22:28,064 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:28,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:28,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1541281114, now seen corresponding path program 9 times [2021-11-21 00:22:28,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:28,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345171899] [2021-11-21 00:22:28,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:28,065 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:28,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:28,283 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:28,283 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:28,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345171899] [2021-11-21 00:22:28,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345171899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:28,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748567460] [2021-11-21 00:22:28,283 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:22:28,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:28,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:28,284 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:28,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:22:28,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:22:28,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:28,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 00:22:28,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:28,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:22:28,728 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:28,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:29,282 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 25 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:29,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748567460] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:29,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2123927029] [2021-11-21 00:22:29,286 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:29,286 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:29,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:29,287 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:29,287 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:29,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-21 00:22:29,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:22:29,605 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:29,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:29,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:29,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:31,999 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:32,643 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:32,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:32,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 37 [2021-11-21 00:22:32,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048595755] [2021-11-21 00:22:32,645 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:32,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:22:32,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:32,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:22:32,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1828, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 00:22:32,647 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 39 states, 38 states have (on average 2.6315789473684212) internal successors, (100), 38 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:33,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:33,009 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2021-11-21 00:22:33,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-21 00:22:33,010 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.6315789473684212) internal successors, (100), 38 states have internal predecessors, (100), 0 states have call successors, (0), 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 [2021-11-21 00:22:33,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:33,011 INFO L225 Difference]: With dead ends: 42 [2021-11-21 00:22:33,011 INFO L226 Difference]: Without dead ends: 42 [2021-11-21 00:22:33,012 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=450, Invalid=2412, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 00:22:33,013 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 242 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:33,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 63 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:22:33,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-21 00:22:33,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 39. [2021-11-21 00:22:33,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:33,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-11-21 00:22:33,017 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2021-11-21 00:22:33,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:33,018 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-11-21 00:22:33,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.6315789473684212) internal successors, (100), 38 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:33,018 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-11-21 00:22:33,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-21 00:22:33,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:33,020 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1] [2021-11-21 00:22:33,052 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:33,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:22:33,231 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:33,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:33,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1808721423, now seen corresponding path program 10 times [2021-11-21 00:22:33,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:33,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673471302] [2021-11-21 00:22:33,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:33,232 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:33,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:33,536 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:33,536 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:33,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673471302] [2021-11-21 00:22:33,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673471302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:33,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169749767] [2021-11-21 00:22:33,537 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:22:33,537 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:33,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:33,556 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:33,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:22:33,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:33,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 00:22:33,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:33,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:22:33,944 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:33,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:34,026 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 [2021-11-21 00:22:34,028 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 [2021-11-21 00:22:34,172 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:34,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169749767] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:34,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [816123327] [2021-11-21 00:22:34,177 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:34,177 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:34,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:34,178 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:34,178 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:34,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:22:34,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:34,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:34,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 128 [2021-11-21 00:22:34,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:34,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:36,885 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:37,537 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:37,537 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:37,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2021-11-21 00:22:37,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241044986] [2021-11-21 00:22:37,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:37,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-21 00:22:37,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:37,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-21 00:22:37,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1154, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:22:37,540 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 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) [2021-11-21 00:22:38,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:38,175 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2021-11-21 00:22:38,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 00:22:38,176 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 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) Word has length 38 [2021-11-21 00:22:38,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:38,176 INFO L225 Difference]: With dead ends: 65 [2021-11-21 00:22:38,176 INFO L226 Difference]: Without dead ends: 42 [2021-11-21 00:22:38,178 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=218, Invalid=2134, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 00:22:38,178 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 73 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 555 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 555 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:38,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 106 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 555 Invalid, 0 Unknown, 31 Unchecked, 0.3s Time] [2021-11-21 00:22:38,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-21 00:22:38,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-11-21 00:22:38,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.05) internal successors, (42), 40 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:38,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-11-21 00:22:38,182 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2021-11-21 00:22:38,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:38,183 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-11-21 00:22:38,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 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) [2021-11-21 00:22:38,183 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-11-21 00:22:38,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-21 00:22:38,184 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:38,184 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1] [2021-11-21 00:22:38,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:38,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:38,399 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:38,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:38,400 INFO L85 PathProgramCache]: Analyzing trace with hash -11316780, now seen corresponding path program 11 times [2021-11-21 00:22:38,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:38,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546171098] [2021-11-21 00:22:38,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:38,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:38,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:38,691 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:38,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:38,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546171098] [2021-11-21 00:22:38,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546171098] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:38,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886044482] [2021-11-21 00:22:38,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:22:38,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:38,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:38,693 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:38,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:22:38,794 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-21 00:22:38,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:38,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-21 00:22:38,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:38,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:22:39,346 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:39,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:39,907 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 36 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:39,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886044482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:39,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016428124] [2021-11-21 00:22:39,909 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:39,909 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:39,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:39,909 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:39,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:39,940 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 6 treesize of output 5 [2021-11-21 00:22:40,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:40,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:40,206 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 136 treesize of output 128 [2021-11-21 00:22:40,355 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 23 treesize of output 19 [2021-11-21 00:22:40,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:42,529 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:43,191 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:43,191 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:43,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 44 [2021-11-21 00:22:43,191 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710370090] [2021-11-21 00:22:43,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:43,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-21 00:22:43,192 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:43,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-21 00:22:43,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=2410, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 00:22:43,194 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 46 states, 45 states have (on average 2.6666666666666665) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:43,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:43,681 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2021-11-21 00:22:43,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 00:22:43,681 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.6666666666666665) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-21 00:22:43,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:43,682 INFO L225 Difference]: With dead ends: 48 [2021-11-21 00:22:43,682 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 00:22:43,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1154 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=643, Invalid=3139, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 00:22:43,684 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 299 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:43,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 54 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:22:43,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 00:22:43,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 45. [2021-11-21 00:22:43,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:43,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-11-21 00:22:43,688 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 40 [2021-11-21 00:22:43,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:43,689 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-11-21 00:22:43,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.6666666666666665) internal successors, (120), 45 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:43,689 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-11-21 00:22:43,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:22:43,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:43,691 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1] [2021-11-21 00:22:43,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:43,903 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:43,903 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:43,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:43,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1594010231, now seen corresponding path program 12 times [2021-11-21 00:22:43,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:43,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318051402] [2021-11-21 00:22:43,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:43,904 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:43,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:44,307 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:44,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:44,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318051402] [2021-11-21 00:22:44,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318051402] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:44,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967361257] [2021-11-21 00:22:44,308 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:22:44,309 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:44,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:44,312 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:44,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:22:44,378 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:22:44,378 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:44,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-21 00:22:44,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:44,578 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 21 treesize of output 17 [2021-11-21 00:22:44,708 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:44,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:44,793 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 [2021-11-21 00:22:44,794 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 [2021-11-21 00:22:44,933 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:44,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967361257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:44,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2090872983] [2021-11-21 00:22:44,935 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:44,935 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:44,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:44,935 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:44,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:44,976 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 6 treesize of output 5 [2021-11-21 00:22:45,068 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 23 treesize of output 19 [2021-11-21 00:22:45,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:22:45,248 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 136 treesize of output 128 [2021-11-21 00:22:45,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:45,551 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 [2021-11-21 00:22:47,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:48,422 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:48,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:48,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2021-11-21 00:22:48,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059101682] [2021-11-21 00:22:48,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:48,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-21 00:22:48,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:48,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-21 00:22:48,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1369, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 00:22:48,424 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 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) [2021-11-21 00:22:49,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:49,156 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2021-11-21 00:22:49,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:22:49,157 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 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 44 [2021-11-21 00:22:49,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:49,157 INFO L225 Difference]: With dead ends: 75 [2021-11-21 00:22:49,157 INFO L226 Difference]: Without dead ends: 48 [2021-11-21 00:22:49,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 108 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=240, Invalid=2622, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 00:22:49,159 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 44 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 694 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:49,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 130 Invalid, 747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 694 Invalid, 0 Unknown, 33 Unchecked, 0.3s Time] [2021-11-21 00:22:49,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-21 00:22:49,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-11-21 00:22:49,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:49,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-11-21 00:22:49,164 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2021-11-21 00:22:49,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:49,164 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-11-21 00:22:49,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 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) [2021-11-21 00:22:49,164 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-11-21 00:22:49,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-21 00:22:49,165 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:49,165 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1] [2021-11-21 00:22:49,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:49,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:49,366 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:49,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:49,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1903237518, now seen corresponding path program 13 times [2021-11-21 00:22:49,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:49,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383218568] [2021-11-21 00:22:49,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:49,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:49,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:49,720 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:49,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:49,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383218568] [2021-11-21 00:22:49,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383218568] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:49,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1782407202] [2021-11-21 00:22:49,721 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:22:49,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:49,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:49,722 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:49,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:22:49,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:49,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 00:22:49,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:50,124 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:50,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:50,518 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 [2021-11-21 00:22:50,569 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:50,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1782407202] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:50,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1740216893] [2021-11-21 00:22:50,571 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:50,571 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:50,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:50,571 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:50,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:50,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:22:50,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:22:50,847 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:50,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:51,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:22:51,316 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 [2021-11-21 00:22:53,077 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:53,694 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:53,694 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:53,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 35 [2021-11-21 00:22:53,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122325309] [2021-11-21 00:22:53,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:53,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-21 00:22:53,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:53,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-21 00:22:53,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=1667, Unknown=0, NotChecked=0, Total=1892 [2021-11-21 00:22:53,697 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 37 states, 36 states have (on average 2.6944444444444446) internal successors, (97), 36 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:54,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:54,171 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-11-21 00:22:54,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 00:22:54,172 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.6944444444444446) internal successors, (97), 36 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-21 00:22:54,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:54,172 INFO L225 Difference]: With dead ends: 54 [2021-11-21 00:22:54,172 INFO L226 Difference]: Without dead ends: 54 [2021-11-21 00:22:54,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=470, Invalid=2392, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 00:22:54,174 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 124 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:54,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 69 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:22:54,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-21 00:22:54,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2021-11-21 00:22:54,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:54,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-11-21 00:22:54,178 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2021-11-21 00:22:54,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:54,179 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-11-21 00:22:54,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.6944444444444446) internal successors, (97), 36 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:54,179 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-11-21 00:22:54,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 00:22:54,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:54,180 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1] [2021-11-21 00:22:54,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:54,380 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:54,381 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:54,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:54,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1155747773, now seen corresponding path program 14 times [2021-11-21 00:22:54,381 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:54,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952613341] [2021-11-21 00:22:54,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:54,381 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:54,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:22:54,784 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:54,784 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:22:54,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952613341] [2021-11-21 00:22:54,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952613341] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:22:54,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470297135] [2021-11-21 00:22:54,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:22:54,785 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:54,785 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:22:54,786 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:22:54,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:22:54,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-21 00:22:54,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:22:54,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-21 00:22:54,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:22:55,173 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 21 treesize of output 17 [2021-11-21 00:22:55,349 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:55,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:22:55,441 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 [2021-11-21 00:22:55,442 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 [2021-11-21 00:22:55,610 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:22:55,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470297135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:22:55,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758005066] [2021-11-21 00:22:55,613 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:22:55,613 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:22:55,613 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:22:55,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:22:55,614 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:22:55,649 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 6 treesize of output 5 [2021-11-21 00:22:55,745 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 20 treesize of output 16 [2021-11-21 00:22:55,948 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:22:55,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:22:56,160 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 23 treesize of output 19 [2021-11-21 00:22:56,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:22:58,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:22:58,704 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:22:58,705 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:22:58,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 35 [2021-11-21 00:22:58,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86891592] [2021-11-21 00:22:58,705 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:22:58,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 00:22:58,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:22:58,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 00:22:58,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1682, Unknown=0, NotChecked=0, Total=1806 [2021-11-21 00:22:58,706 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 36 states, 36 states have (on average 2.25) internal successors, (81), 35 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:59,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:22:59,562 INFO L93 Difference]: Finished difference Result 85 states and 86 transitions. [2021-11-21 00:22:59,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-21 00:22:59,563 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.25) internal successors, (81), 35 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-21 00:22:59,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:22:59,563 INFO L225 Difference]: With dead ends: 85 [2021-11-21 00:22:59,563 INFO L226 Difference]: Without dead ends: 54 [2021-11-21 00:22:59,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 124 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 557 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=267, Invalid=3273, Unknown=0, NotChecked=0, Total=3540 [2021-11-21 00:22:59,565 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 121 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 961 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 1048 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:22:59,566 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 177 Invalid, 1048 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 961 Invalid, 0 Unknown, 42 Unchecked, 0.4s Time] [2021-11-21 00:22:59,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-21 00:22:59,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-11-21 00:22:59,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 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) [2021-11-21 00:22:59,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-11-21 00:22:59,570 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2021-11-21 00:22:59,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:22:59,570 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-11-21 00:22:59,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.25) internal successors, (81), 35 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:22:59,570 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-11-21 00:22:59,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 00:22:59,575 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:22:59,575 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1] [2021-11-21 00:22:59,603 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:22:59,783 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:22:59,783 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:22:59,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:22:59,783 INFO L85 PathProgramCache]: Analyzing trace with hash 1999412360, now seen corresponding path program 15 times [2021-11-21 00:22:59,783 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:22:59,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436540996] [2021-11-21 00:22:59,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:22:59,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:22:59,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:00,181 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:00,181 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:00,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436540996] [2021-11-21 00:23:00,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436540996] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:00,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156230173] [2021-11-21 00:23:00,181 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:00,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:00,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:00,183 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:00,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:23:00,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:00,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:00,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-21 00:23:00,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:00,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:23:00,923 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:00,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:01,837 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 64 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:01,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156230173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:01,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665132250] [2021-11-21 00:23:01,838 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:01,839 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:01,839 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:01,839 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:01,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:01,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:23:01,973 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 23 treesize of output 19 [2021-11-21 00:23:02,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:02,161 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 136 treesize of output 128 [2021-11-21 00:23:02,293 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 23 treesize of output 19 [2021-11-21 00:23:02,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:04,510 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:05,289 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:05,290 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:05,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 55 [2021-11-21 00:23:05,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988298506] [2021-11-21 00:23:05,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:05,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-21 00:23:05,290 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:05,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-21 00:23:05,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=3577, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 00:23:05,292 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 57 states, 56 states have (on average 2.75) internal successors, (154), 56 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:05,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:05,936 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2021-11-21 00:23:05,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 00:23:05,937 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 2.75) internal successors, (154), 56 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-21 00:23:05,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:05,938 INFO L225 Difference]: With dead ends: 60 [2021-11-21 00:23:05,938 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 00:23:05,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1795 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=858, Invalid=4692, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 00:23:05,940 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 196 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 709 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 771 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 709 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:05,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 124 Invalid, 771 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 709 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:23:05,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 00:23:05,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2021-11-21 00:23:05,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:05,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-11-21 00:23:05,945 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 52 [2021-11-21 00:23:05,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:05,946 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-11-21 00:23:05,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 2.75) internal successors, (154), 56 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:05,947 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-11-21 00:23:05,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-21 00:23:05,947 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:05,948 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1] [2021-11-21 00:23:05,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:06,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 00:23:06,163 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:06,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:06,163 INFO L85 PathProgramCache]: Analyzing trace with hash -1593170371, now seen corresponding path program 16 times [2021-11-21 00:23:06,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:06,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [312601926] [2021-11-21 00:23:06,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:06,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:06,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:06,629 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:06,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:06,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [312601926] [2021-11-21 00:23:06,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [312601926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:06,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426914600] [2021-11-21 00:23:06,630 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:23:06,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:06,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:06,635 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:06,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:23:06,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:06,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-21 00:23:06,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:07,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:23:07,217 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:07,328 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 [2021-11-21 00:23:07,329 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 [2021-11-21 00:23:07,491 INFO L134 CoverageAnalysis]: Checked inductivity of 217 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:07,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426914600] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:07,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [535924003] [2021-11-21 00:23:07,494 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:07,494 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:07,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:07,494 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:07,494 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:07,547 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 6 treesize of output 5 [2021-11-21 00:23:07,677 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 23 treesize of output 19 [2021-11-21 00:23:07,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:07,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 128 [2021-11-21 00:23:08,058 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 23 treesize of output 19 [2021-11-21 00:23:08,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:10,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:11,188 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:11,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:11,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 37 [2021-11-21 00:23:11,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123244126] [2021-11-21 00:23:11,189 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:11,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 00:23:11,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:11,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 00:23:11,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1853, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:23:11,190 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 37 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) [2021-11-21 00:23:12,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:12,159 INFO L93 Difference]: Finished difference Result 95 states and 96 transitions. [2021-11-21 00:23:12,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 00:23:12,159 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 37 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 56 [2021-11-21 00:23:12,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:12,160 INFO L225 Difference]: With dead ends: 95 [2021-11-21 00:23:12,160 INFO L226 Difference]: Without dead ends: 60 [2021-11-21 00:23:12,161 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=284, Invalid=3748, Unknown=0, NotChecked=0, Total=4032 [2021-11-21 00:23:12,162 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 109 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 1019 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 1090 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 1019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:12,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 194 Invalid, 1090 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 1019 Invalid, 0 Unknown, 29 Unchecked, 0.5s Time] [2021-11-21 00:23:12,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-21 00:23:12,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-11-21 00:23:12,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 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) [2021-11-21 00:23:12,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-11-21 00:23:12,166 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 56 [2021-11-21 00:23:12,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:12,166 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-11-21 00:23:12,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.289473684210526) internal successors, (87), 37 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) [2021-11-21 00:23:12,166 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-11-21 00:23:12,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-21 00:23:12,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:12,167 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1] [2021-11-21 00:23:12,190 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:12,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-21 00:23:12,371 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:12,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:12,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1451690690, now seen corresponding path program 17 times [2021-11-21 00:23:12,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:12,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736200281] [2021-11-21 00:23:12,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:12,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:12,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:12,752 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:12,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:12,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736200281] [2021-11-21 00:23:12,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736200281] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:12,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59346717] [2021-11-21 00:23:12,753 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:12,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:12,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:12,753 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:12,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:23:12,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-21 00:23:12,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:12,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-21 00:23:12,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:12,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:23:13,651 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:13,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:14,617 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 81 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:14,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59346717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:14,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858906115] [2021-11-21 00:23:14,619 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:14,619 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:14,619 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:14,619 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:14,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:14,646 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 6 treesize of output 5 [2021-11-21 00:23:14,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:23:14,936 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:23:14,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:23:15,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:15,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:17,340 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:18,104 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:18,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:18,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 62 [2021-11-21 00:23:18,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669713799] [2021-11-21 00:23:18,105 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:18,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-21 00:23:18,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:18,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-21 00:23:18,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=628, Invalid=4342, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 00:23:18,107 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 64 states, 63 states have (on average 2.761904761904762) internal successors, (174), 63 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:18,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:18,787 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2021-11-21 00:23:18,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 00:23:18,788 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.761904761904762) internal successors, (174), 63 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2021-11-21 00:23:18,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:18,789 INFO L225 Difference]: With dead ends: 66 [2021-11-21 00:23:18,789 INFO L226 Difference]: Without dead ends: 66 [2021-11-21 00:23:18,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2183 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1171, Invalid=5635, Unknown=0, NotChecked=0, Total=6806 [2021-11-21 00:23:18,791 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 324 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 596 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:18,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [324 Valid, 96 Invalid, 688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 596 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:23:18,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-21 00:23:18,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2021-11-21 00:23:18,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 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) [2021-11-21 00:23:18,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-11-21 00:23:18,795 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-11-21 00:23:18,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:18,795 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-11-21 00:23:18,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.761904761904762) internal successors, (174), 63 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:18,796 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-11-21 00:23:18,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-21 00:23:18,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:18,797 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 1, 1, 1, 1] [2021-11-21 00:23:18,829 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:19,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-21 00:23:19,018 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:19,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:19,018 INFO L85 PathProgramCache]: Analyzing trace with hash 1420748663, now seen corresponding path program 18 times [2021-11-21 00:23:19,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:19,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823298321] [2021-11-21 00:23:19,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:19,019 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:19,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:19,450 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:19,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:19,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823298321] [2021-11-21 00:23:19,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823298321] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:19,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095715166] [2021-11-21 00:23:19,451 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:19,451 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:19,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:19,452 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:19,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 00:23:19,554 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:19,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:19,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-21 00:23:19,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:19,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:23:20,131 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:20,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:20,285 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 [2021-11-21 00:23:20,287 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 [2021-11-21 00:23:20,470 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:20,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095715166] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:20,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020824856] [2021-11-21 00:23:20,472 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:20,472 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:20,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:20,472 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:20,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:20,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-21 00:23:20,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:23:20,794 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:23:20,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:23:21,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:21,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:23,187 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:23,956 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:23,956 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:23,956 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2021-11-21 00:23:23,957 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037603117] [2021-11-21 00:23:23,957 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:23,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 00:23:23,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:23,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 00:23:23,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2122, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 00:23:23,958 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 41 states, 41 states have (on average 2.317073170731707) internal successors, (95), 40 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:25,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:25,143 INFO L93 Difference]: Finished difference Result 105 states and 106 transitions. [2021-11-21 00:23:25,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-21 00:23:25,144 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.317073170731707) internal successors, (95), 40 states have internal predecessors, (95), 0 states have call successors, (0), 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 62 [2021-11-21 00:23:25,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:25,144 INFO L225 Difference]: With dead ends: 105 [2021-11-21 00:23:25,144 INFO L226 Difference]: Without dead ends: 66 [2021-11-21 00:23:25,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 159 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=306, Invalid=4386, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 00:23:25,145 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 94 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 1376 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 1452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:25,146 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 264 Invalid, 1452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1376 Invalid, 0 Unknown, 37 Unchecked, 0.6s Time] [2021-11-21 00:23:25,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-21 00:23:25,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-11-21 00:23:25,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.03125) internal successors, (66), 64 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) [2021-11-21 00:23:25,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 66 transitions. [2021-11-21 00:23:25,150 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 66 transitions. Word has length 62 [2021-11-21 00:23:25,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:25,150 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 66 transitions. [2021-11-21 00:23:25,150 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.317073170731707) internal successors, (95), 40 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:25,150 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 66 transitions. [2021-11-21 00:23:25,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 00:23:25,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:25,151 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1, 1] [2021-11-21 00:23:25,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-21 00:23:25,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-21 00:23:25,355 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:25,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:25,355 INFO L85 PathProgramCache]: Analyzing trace with hash -2054319044, now seen corresponding path program 19 times [2021-11-21 00:23:25,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:25,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120970709] [2021-11-21 00:23:25,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:25,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:25,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:25,860 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:25,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:25,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120970709] [2021-11-21 00:23:25,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120970709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:25,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697079877] [2021-11-21 00:23:25,861 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:23:25,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:25,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:25,862 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:25,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-21 00:23:25,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:25,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-21 00:23:25,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:26,413 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:26,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:26,913 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 [2021-11-21 00:23:26,976 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:26,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697079877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:26,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202002961] [2021-11-21 00:23:26,978 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:26,978 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:26,978 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:26,978 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:26,978 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:27,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:23:27,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:27,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:27,331 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 136 treesize of output 128 [2021-11-21 00:23:27,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:27,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:29,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:30,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:30,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:30,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 47 [2021-11-21 00:23:30,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827431353] [2021-11-21 00:23:30,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:30,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 00:23:30,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:30,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 00:23:30,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=2723, Unknown=0, NotChecked=0, Total=3080 [2021-11-21 00:23:30,433 INFO L87 Difference]: Start difference. First operand 65 states and 66 transitions. Second operand has 49 states, 48 states have (on average 2.7708333333333335) internal successors, (133), 48 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) [2021-11-21 00:23:31,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:31,062 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2021-11-21 00:23:31,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:23:31,062 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.7708333333333335) internal successors, (133), 48 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 64 [2021-11-21 00:23:31,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:31,063 INFO L225 Difference]: With dead ends: 72 [2021-11-21 00:23:31,063 INFO L226 Difference]: Without dead ends: 72 [2021-11-21 00:23:31,063 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1333 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 00:23:31,064 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 119 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 854 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 854 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:31,064 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [119 Valid, 139 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 854 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:23:31,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-21 00:23:31,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2021-11-21 00:23:31,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 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) [2021-11-21 00:23:31,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-11-21 00:23:31,068 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2021-11-21 00:23:31,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:31,069 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-11-21 00:23:31,069 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.7708333333333335) internal successors, (133), 48 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) [2021-11-21 00:23:31,069 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-11-21 00:23:31,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 00:23:31,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:31,070 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 1, 1, 1, 1] [2021-11-21 00:23:31,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:31,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-21 00:23:31,279 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:31,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:31,279 INFO L85 PathProgramCache]: Analyzing trace with hash 570434545, now seen corresponding path program 20 times [2021-11-21 00:23:31,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:31,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966710324] [2021-11-21 00:23:31,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:31,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:31,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:31,792 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:31,792 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:31,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966710324] [2021-11-21 00:23:31,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966710324] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:31,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583471649] [2021-11-21 00:23:31,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:31,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:31,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:31,794 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:31,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-21 00:23:31,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 00:23:31,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:31,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-21 00:23:31,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:32,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:23:32,611 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:32,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:32,749 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 [2021-11-21 00:23:32,750 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 [2021-11-21 00:23:32,934 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:32,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583471649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:32,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119443063] [2021-11-21 00:23:32,935 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:32,936 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:32,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:32,936 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:32,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:32,966 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 6 treesize of output 5 [2021-11-21 00:23:33,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:23:33,239 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:23:33,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:23:33,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:33,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:35,623 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:36,429 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:36,430 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:36,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2021-11-21 00:23:36,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154487020] [2021-11-21 00:23:36,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:36,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-21 00:23:36,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:36,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-21 00:23:36,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2409, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 00:23:36,431 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 44 states, 44 states have (on average 2.340909090909091) internal successors, (103), 43 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:37,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:37,707 INFO L93 Difference]: Finished difference Result 115 states and 116 transitions. [2021-11-21 00:23:37,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:23:37,708 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.340909090909091) internal successors, (103), 43 states have internal predecessors, (103), 0 states have call successors, (0), 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 68 [2021-11-21 00:23:37,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:37,708 INFO L225 Difference]: With dead ends: 115 [2021-11-21 00:23:37,709 INFO L226 Difference]: Without dead ends: 72 [2021-11-21 00:23:37,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 176 SyntacticMatches, 3 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=328, Invalid=5074, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 00:23:37,710 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 134 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 1493 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 1582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 36 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:37,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 286 Invalid, 1582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1493 Invalid, 0 Unknown, 36 Unchecked, 0.6s Time] [2021-11-21 00:23:37,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-21 00:23:37,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-11-21 00:23:37,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 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) [2021-11-21 00:23:37,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-11-21 00:23:37,713 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 68 [2021-11-21 00:23:37,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:37,714 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-11-21 00:23:37,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.340909090909091) internal successors, (103), 43 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:37,715 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-11-21 00:23:37,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-21 00:23:37,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:37,716 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1] [2021-11-21 00:23:37,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:37,916 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-21 00:23:37,916 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:37,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:37,917 INFO L85 PathProgramCache]: Analyzing trace with hash 425289974, now seen corresponding path program 21 times [2021-11-21 00:23:37,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:37,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838818213] [2021-11-21 00:23:37,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:37,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:37,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:38,418 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:38,418 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:38,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838818213] [2021-11-21 00:23:38,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838818213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:38,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019673877] [2021-11-21 00:23:38,418 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:23:38,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:38,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:38,420 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:38,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-21 00:23:38,520 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:23:38,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:38,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-21 00:23:38,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:38,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:23:39,441 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:39,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:40,687 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 121 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:40,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019673877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:40,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1331219237] [2021-11-21 00:23:40,689 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:40,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:40,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:40,689 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:40,689 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:40,728 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 6 treesize of output 5 [2021-11-21 00:23:40,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:41,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:41,003 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 136 treesize of output 128 [2021-11-21 00:23:41,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:41,292 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 [2021-11-21 00:23:43,318 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:44,199 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:44,199 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:44,200 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 73 [2021-11-21 00:23:44,200 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796056291] [2021-11-21 00:23:44,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:44,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2021-11-21 00:23:44,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:44,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-11-21 00:23:44,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=740, Invalid=5902, Unknown=0, NotChecked=0, Total=6642 [2021-11-21 00:23:44,202 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 75 states, 74 states have (on average 2.810810810810811) internal successors, (208), 74 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:45,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:45,036 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2021-11-21 00:23:45,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-21 00:23:45,036 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 74 states have (on average 2.810810810810811) internal successors, (208), 74 states have internal predecessors, (208), 0 states have call successors, (0), 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 70 [2021-11-21 00:23:45,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:45,037 INFO L225 Difference]: With dead ends: 78 [2021-11-21 00:23:45,037 INFO L226 Difference]: Without dead ends: 78 [2021-11-21 00:23:45,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3064 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1401, Invalid=7719, Unknown=0, NotChecked=0, Total=9120 [2021-11-21 00:23:45,039 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 211 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 1200 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 1267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 1200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:45,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 215 Invalid, 1267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 1200 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:23:45,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-21 00:23:45,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 75. [2021-11-21 00:23:45,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:45,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-11-21 00:23:45,043 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2021-11-21 00:23:45,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:45,043 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-11-21 00:23:45,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 74 states have (on average 2.810810810810811) internal successors, (208), 74 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:45,044 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-11-21 00:23:45,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 00:23:45,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:45,044 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 1, 1, 1, 1] [2021-11-21 00:23:45,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:45,267 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:45,267 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:45,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:45,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1912665173, now seen corresponding path program 22 times [2021-11-21 00:23:45,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:45,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502575698] [2021-11-21 00:23:45,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:45,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:45,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:45,819 INFO L134 CoverageAnalysis]: Checked inductivity of 397 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:45,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:45,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502575698] [2021-11-21 00:23:45,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502575698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:45,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439123690] [2021-11-21 00:23:45,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:23:45,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:45,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:45,821 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:45,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-21 00:23:45,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:45,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 00:23:45,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:46,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:23:46,521 INFO L134 CoverageAnalysis]: Checked inductivity of 397 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:46,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:46,658 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 [2021-11-21 00:23:46,659 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 [2021-11-21 00:23:46,840 INFO L134 CoverageAnalysis]: Checked inductivity of 397 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:46,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439123690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:46,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [535961445] [2021-11-21 00:23:46,842 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:46,842 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:46,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:46,843 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:46,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:46,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:23:46,973 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 23 treesize of output 19 [2021-11-21 00:23:47,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:23:47,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 128 [2021-11-21 00:23:47,284 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 23 treesize of output 19 [2021-11-21 00:23:47,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:49,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:50,350 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:50,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:50,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2021-11-21 00:23:50,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362123346] [2021-11-21 00:23:50,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:50,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-21 00:23:50,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:50,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-21 00:23:50,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2714, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 00:23:50,352 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 47 states, 47 states have (on average 2.3617021276595747) internal successors, (111), 46 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) [2021-11-21 00:23:51,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:51,868 INFO L93 Difference]: Finished difference Result 125 states and 126 transitions. [2021-11-21 00:23:51,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-21 00:23:51,868 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.3617021276595747) internal successors, (111), 46 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 74 [2021-11-21 00:23:51,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:51,869 INFO L225 Difference]: With dead ends: 125 [2021-11-21 00:23:51,869 INFO L226 Difference]: Without dead ends: 78 [2021-11-21 00:23:51,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 193 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 843 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=350, Invalid=5812, Unknown=0, NotChecked=0, Total=6162 [2021-11-21 00:23:51,870 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 147 mSDsluCounter, 373 mSDsCounter, 0 mSdLazyCounter, 1921 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 2042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 1921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:51,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 367 Invalid, 2042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 1921 Invalid, 0 Unknown, 63 Unchecked, 0.8s Time] [2021-11-21 00:23:51,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-21 00:23:51,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-11-21 00:23:51,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0263157894736843) internal successors, (78), 76 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:51,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2021-11-21 00:23:51,874 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 74 [2021-11-21 00:23:51,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:51,874 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2021-11-21 00:23:51,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.3617021276595747) internal successors, (111), 46 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) [2021-11-21 00:23:51,875 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2021-11-21 00:23:51,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 00:23:51,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:51,876 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1] [2021-11-21 00:23:51,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-21 00:23:52,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:52,095 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:23:52,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:23:52,095 INFO L85 PathProgramCache]: Analyzing trace with hash -183518992, now seen corresponding path program 23 times [2021-11-21 00:23:52,095 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:23:52,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127003661] [2021-11-21 00:23:52,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:23:52,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:23:52,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:23:52,624 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:52,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:23:52,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127003661] [2021-11-21 00:23:52,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127003661] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:23:52,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51928191] [2021-11-21 00:23:52,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:23:52,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:23:52,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:23:52,628 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:23:52,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-21 00:23:52,788 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-21 00:23:52,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:23:52,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-21 00:23:52,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:23:52,811 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:23:53,875 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:53,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:23:55,303 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 144 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:23:55,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51928191] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:23:55,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [185697984] [2021-11-21 00:23:55,305 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:23:55,305 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:23:55,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:23:55,306 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:23:55,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:23:55,356 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 6 treesize of output 5 [2021-11-21 00:23:55,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:23:55,610 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:23:55,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:23:55,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:23:55,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:23:57,959 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:23:58,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:23:58,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:23:58,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 80 [2021-11-21 00:23:58,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516525421] [2021-11-21 00:23:58,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:23:58,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-21 00:23:58,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:23:58,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-21 00:23:58,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1000, Invalid=6832, Unknown=0, NotChecked=0, Total=7832 [2021-11-21 00:23:58,826 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand has 82 states, 81 states have (on average 2.814814814814815) internal successors, (228), 81 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:59,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:23:59,821 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2021-11-21 00:23:59,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-21 00:23:59,822 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 2.814814814814815) internal successors, (228), 81 states have internal predecessors, (228), 0 states have call successors, (0), 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 76 [2021-11-21 00:23:59,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:23:59,823 INFO L225 Difference]: With dead ends: 84 [2021-11-21 00:23:59,823 INFO L226 Difference]: Without dead ends: 84 [2021-11-21 00:23:59,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3527 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1861, Invalid=8851, Unknown=0, NotChecked=0, Total=10712 [2021-11-21 00:23:59,824 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 328 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:23:59,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [328 Valid, 144 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:23:59,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-21 00:23:59,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-11-21 00:23:59,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.025) internal successors, (82), 80 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:59,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2021-11-21 00:23:59,827 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 76 [2021-11-21 00:23:59,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:23:59,827 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2021-11-21 00:23:59,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 81 states have (on average 2.814814814814815) internal successors, (228), 81 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:23:59,828 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2021-11-21 00:23:59,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 00:23:59,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:23:59,828 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 1, 1, 1, 1] [2021-11-21 00:23:59,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:00,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-11-21 00:24:00,047 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:00,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:00,047 INFO L85 PathProgramCache]: Analyzing trace with hash 95997605, now seen corresponding path program 24 times [2021-11-21 00:24:00,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:00,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353921919] [2021-11-21 00:24:00,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:00,048 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:00,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:00,823 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:00,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:00,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353921919] [2021-11-21 00:24:00,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353921919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:00,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848927519] [2021-11-21 00:24:00,824 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:24:00,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:00,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:00,825 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:00,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-21 00:24:01,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:24:01,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:01,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-21 00:24:01,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:01,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:24:01,779 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:01,779 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:01,933 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 [2021-11-21 00:24:01,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-21 00:24:02,135 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:02,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848927519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:02,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [781701042] [2021-11-21 00:24:02,136 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:02,136 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:02,137 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:02,137 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:02,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:02,190 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 6 treesize of output 5 [2021-11-21 00:24:02,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:02,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:02,481 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 136 treesize of output 128 [2021-11-21 00:24:02,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:02,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:24:04,885 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:05,762 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:05,763 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:05,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2021-11-21 00:24:05,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061433155] [2021-11-21 00:24:05,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:05,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-21 00:24:05,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:05,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-21 00:24:05,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=3037, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:24:05,765 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand has 50 states, 50 states have (on average 2.38) internal successors, (119), 49 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) [2021-11-21 00:24:07,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:07,548 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2021-11-21 00:24:07,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-21 00:24:07,548 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.38) internal successors, (119), 49 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2021-11-21 00:24:07,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:07,549 INFO L225 Difference]: With dead ends: 135 [2021-11-21 00:24:07,549 INFO L226 Difference]: Without dead ends: 84 [2021-11-21 00:24:07,550 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 210 SyntacticMatches, 3 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 937 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=372, Invalid=6600, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 00:24:07,551 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 118 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 2114 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 2206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 2114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:07,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 400 Invalid, 2206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 2114 Invalid, 0 Unknown, 42 Unchecked, 0.8s Time] [2021-11-21 00:24:07,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-21 00:24:07,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-11-21 00:24:07,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 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) [2021-11-21 00:24:07,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-11-21 00:24:07,554 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 80 [2021-11-21 00:24:07,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:07,554 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-11-21 00:24:07,555 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.38) internal successors, (119), 49 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) [2021-11-21 00:24:07,555 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-11-21 00:24:07,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-21 00:24:07,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:07,556 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 1, 1, 1, 1] [2021-11-21 00:24:07,582 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2021-11-21 00:24:07,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:07,767 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:07,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:07,767 INFO L85 PathProgramCache]: Analyzing trace with hash -1193167830, now seen corresponding path program 25 times [2021-11-21 00:24:07,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:07,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705664048] [2021-11-21 00:24:07,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:07,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:07,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:08,455 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 144 proven. 350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:08,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:08,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705664048] [2021-11-21 00:24:08,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705664048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:08,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942509272] [2021-11-21 00:24:08,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:24:08,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:08,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:08,459 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:08,487 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-21 00:24:08,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:08,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-21 00:24:08,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:09,283 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 144 proven. 350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:09,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:09,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-21 00:24:10,041 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 144 proven. 350 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:10,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942509272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:10,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197248674] [2021-11-21 00:24:10,042 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:10,043 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:10,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:10,043 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:10,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:10,076 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 6 treesize of output 5 [2021-11-21 00:24:10,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:10,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:10,343 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 136 treesize of output 128 [2021-11-21 00:24:10,509 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 23 treesize of output 19 [2021-11-21 00:24:10,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:24:12,634 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:13,454 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:13,455 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:13,455 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 59 [2021-11-21 00:24:13,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449272200] [2021-11-21 00:24:13,455 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:13,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-21 00:24:13,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:13,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-21 00:24:13,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=525, Invalid=4031, Unknown=0, NotChecked=0, Total=4556 [2021-11-21 00:24:13,461 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 61 states, 60 states have (on average 2.816666666666667) internal successors, (169), 60 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:14,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:14,433 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2021-11-21 00:24:14,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-21 00:24:14,433 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.816666666666667) internal successors, (169), 60 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-21 00:24:14,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:14,434 INFO L225 Difference]: With dead ends: 90 [2021-11-21 00:24:14,434 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:24:14,435 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 204 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1990 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1157, Invalid=5815, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 00:24:14,435 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 337 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 1424 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 1520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 1424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:14,435 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [337 Valid, 233 Invalid, 1520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 1424 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:24:14,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:24:14,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 87. [2021-11-21 00:24:14,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 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) [2021-11-21 00:24:14,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-11-21 00:24:14,437 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2021-11-21 00:24:14,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:14,437 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-11-21 00:24:14,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 2.816666666666667) internal successors, (169), 60 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:14,438 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-11-21 00:24:14,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-21 00:24:14,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:14,438 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 1, 1, 1, 1] [2021-11-21 00:24:14,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:14,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:14,639 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:14,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:14,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1296473311, now seen corresponding path program 26 times [2021-11-21 00:24:14,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:14,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103977022] [2021-11-21 00:24:14,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:14,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:14,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:15,327 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 40 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:15,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:15,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103977022] [2021-11-21 00:24:15,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103977022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:15,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414453940] [2021-11-21 00:24:15,328 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:24:15,328 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:15,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:15,329 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:15,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-21 00:24:15,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-21 00:24:15,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:15,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-21 00:24:15,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:16,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:24:16,392 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 40 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:16,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:16,555 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 [2021-11-21 00:24:16,557 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 26 treesize of output 22 [2021-11-21 00:24:16,779 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 40 proven. 507 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:16,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414453940] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:16,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804123605] [2021-11-21 00:24:16,781 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:16,781 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:16,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:16,781 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:16,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:16,827 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 6 treesize of output 5 [2021-11-21 00:24:16,933 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 20 treesize of output 16 [2021-11-21 00:24:17,102 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:24:17,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:24:17,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:17,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:24:19,371 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:20,232 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:20,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:20,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 53 [2021-11-21 00:24:20,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395709140] [2021-11-21 00:24:20,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:20,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-21 00:24:20,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:20,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-21 00:24:20,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=3494, Unknown=0, NotChecked=0, Total=3660 [2021-11-21 00:24:20,234 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand has 54 states, 54 states have (on average 2.388888888888889) internal successors, (129), 53 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) [2021-11-21 00:24:22,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:22,153 INFO L93 Difference]: Finished difference Result 145 states and 146 transitions. [2021-11-21 00:24:22,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-21 00:24:22,153 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.388888888888889) internal successors, (129), 53 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 86 [2021-11-21 00:24:22,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:22,154 INFO L225 Difference]: With dead ends: 145 [2021-11-21 00:24:22,154 INFO L226 Difference]: Without dead ends: 90 [2021-11-21 00:24:22,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 226 SyntacticMatches, 3 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=399, Invalid=7611, Unknown=0, NotChecked=0, Total=8010 [2021-11-21 00:24:22,155 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 131 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 2494 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 482 SdHoareTripleChecker+Invalid, 2588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 2494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:22,155 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 482 Invalid, 2588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 2494 Invalid, 0 Unknown, 38 Unchecked, 1.0s Time] [2021-11-21 00:24:22,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-21 00:24:22,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-11-21 00:24:22,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0227272727272727) internal successors, (90), 88 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) [2021-11-21 00:24:22,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2021-11-21 00:24:22,158 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 86 [2021-11-21 00:24:22,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:22,158 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2021-11-21 00:24:22,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.388888888888889) internal successors, (129), 53 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) [2021-11-21 00:24:22,159 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2021-11-21 00:24:22,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-21 00:24:22,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:22,160 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 1, 1, 1, 1] [2021-11-21 00:24:22,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:22,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-21 00:24:22,371 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:22,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:22,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1896647332, now seen corresponding path program 27 times [2021-11-21 00:24:22,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:22,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344880873] [2021-11-21 00:24:22,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:22,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:22,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:23,138 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 169 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:23,139 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:23,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344880873] [2021-11-21 00:24:23,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344880873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:23,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235691955] [2021-11-21 00:24:23,139 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:24:23,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:23,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:23,140 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:23,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-21 00:24:23,318 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:24:23,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:23,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 00:24:23,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:23,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:24:24,708 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 169 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:24,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:26,394 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 196 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:26,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235691955] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:26,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [130992164] [2021-11-21 00:24:26,396 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:26,396 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:26,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:26,396 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:26,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:26,437 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 6 treesize of output 5 [2021-11-21 00:24:26,509 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 20 treesize of output 16 [2021-11-21 00:24:26,704 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:24:26,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:24:26,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:26,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:24:29,016 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:29,982 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:29,982 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:29,982 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 31] total 91 [2021-11-21 00:24:29,982 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912369676] [2021-11-21 00:24:29,982 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:29,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-21 00:24:29,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:29,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-21 00:24:29,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1097, Invalid=8803, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 00:24:29,984 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand has 93 states, 92 states have (on average 2.847826086956522) internal successors, (262), 92 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:31,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:31,144 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2021-11-21 00:24:31,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-21 00:24:31,145 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 92 states have (on average 2.847826086956522) internal successors, (262), 92 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2021-11-21 00:24:31,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:31,146 INFO L225 Difference]: With dead ends: 96 [2021-11-21 00:24:31,146 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 00:24:31,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 193 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4666 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2079, Invalid=11493, Unknown=0, NotChecked=0, Total=13572 [2021-11-21 00:24:31,147 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 308 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 1819 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 308 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 1918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 1819 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:31,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [308 Valid, 324 Invalid, 1918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 1819 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:24:31,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 00:24:31,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93. [2021-11-21 00:24:31,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:31,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2021-11-21 00:24:31,150 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 88 [2021-11-21 00:24:31,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:31,151 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2021-11-21 00:24:31,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 92 states have (on average 2.847826086956522) internal successors, (262), 92 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:31,151 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2021-11-21 00:24:31,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-21 00:24:31,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:31,152 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 1, 1, 1, 1] [2021-11-21 00:24:31,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2021-11-21 00:24:31,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-21 00:24:31,359 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:31,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:31,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1362254247, now seen corresponding path program 28 times [2021-11-21 00:24:31,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:31,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019328320] [2021-11-21 00:24:31,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:31,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:31,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:32,141 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 43 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:32,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:32,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019328320] [2021-11-21 00:24:32,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019328320] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:32,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [858122116] [2021-11-21 00:24:32,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:24:32,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:32,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:32,143 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:32,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-21 00:24:32,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:32,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-21 00:24:32,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:32,804 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 21 treesize of output 17 [2021-11-21 00:24:33,050 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 43 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:33,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:33,276 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 [2021-11-21 00:24:33,278 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 [2021-11-21 00:24:33,514 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 43 proven. 588 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:33,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [858122116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:33,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [674675660] [2021-11-21 00:24:33,515 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:33,516 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:33,516 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:33,516 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:33,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:33,561 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 6 treesize of output 5 [2021-11-21 00:24:33,665 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 23 treesize of output 19 [2021-11-21 00:24:33,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:33,825 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 136 treesize of output 128 [2021-11-21 00:24:33,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:34,042 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 [2021-11-21 00:24:36,146 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:37,072 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:37,072 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:37,072 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2021-11-21 00:24:37,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267674426] [2021-11-21 00:24:37,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:37,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-21 00:24:37,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:37,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-21 00:24:37,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=3737, Unknown=0, NotChecked=0, Total=3906 [2021-11-21 00:24:37,074 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand has 56 states, 56 states have (on average 2.4107142857142856) internal successors, (135), 55 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:39,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:39,313 INFO L93 Difference]: Finished difference Result 155 states and 156 transitions. [2021-11-21 00:24:39,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-21 00:24:39,314 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.4107142857142856) internal successors, (135), 55 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-21 00:24:39,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:39,314 INFO L225 Difference]: With dead ends: 155 [2021-11-21 00:24:39,314 INFO L226 Difference]: Without dead ends: 96 [2021-11-21 00:24:39,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1140 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=416, Invalid=8326, Unknown=0, NotChecked=0, Total=8742 [2021-11-21 00:24:39,315 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 184 mSDsluCounter, 577 mSDsCounter, 0 mSdLazyCounter, 3055 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 574 SdHoareTripleChecker+Invalid, 3129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 3055 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:39,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 574 Invalid, 3129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 3055 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-21 00:24:39,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-21 00:24:39,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-11-21 00:24:39,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0212765957446808) internal successors, (96), 94 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) [2021-11-21 00:24:39,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 96 transitions. [2021-11-21 00:24:39,318 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 96 transitions. Word has length 92 [2021-11-21 00:24:39,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:39,319 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 96 transitions. [2021-11-21 00:24:39,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.4107142857142856) internal successors, (135), 55 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:39,319 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 96 transitions. [2021-11-21 00:24:39,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 00:24:39,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:39,319 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 1, 1, 1, 1] [2021-11-21 00:24:39,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:39,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-21 00:24:39,520 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:39,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:39,521 INFO L85 PathProgramCache]: Analyzing trace with hash 81357918, now seen corresponding path program 29 times [2021-11-21 00:24:39,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:39,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824142750] [2021-11-21 00:24:39,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:39,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:39,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:40,215 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 196 proven. 464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:40,215 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:40,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824142750] [2021-11-21 00:24:40,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1824142750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:40,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473109740] [2021-11-21 00:24:40,216 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:24:40,216 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:40,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:40,225 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:40,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-21 00:24:40,507 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-21 00:24:40,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:40,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-21 00:24:40,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:40,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:24:41,980 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 196 proven. 464 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:41,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:43,977 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 225 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:43,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473109740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:43,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998072089] [2021-11-21 00:24:43,978 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:43,978 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:43,978 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:43,978 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:43,979 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:44,019 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 6 treesize of output 5 [2021-11-21 00:24:44,110 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 23 treesize of output 19 [2021-11-21 00:24:44,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:44,318 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 136 treesize of output 128 [2021-11-21 00:24:44,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:44,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:24:46,842 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:47,802 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:47,802 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:47,803 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 33] total 98 [2021-11-21 00:24:47,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45795051] [2021-11-21 00:24:47,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:47,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-21 00:24:47,804 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:47,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-21 00:24:47,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1462, Invalid=9880, Unknown=0, NotChecked=0, Total=11342 [2021-11-21 00:24:47,806 INFO L87 Difference]: Start difference. First operand 95 states and 96 transitions. Second operand has 100 states, 99 states have (on average 2.8484848484848486) internal successors, (282), 99 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:49,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:49,250 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2021-11-21 00:24:49,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-21 00:24:49,250 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 2.8484848484848486) internal successors, (282), 99 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-21 00:24:49,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:49,251 INFO L225 Difference]: With dead ends: 102 [2021-11-21 00:24:49,251 INFO L226 Difference]: Without dead ends: 102 [2021-11-21 00:24:49,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5186 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=2713, Invalid=12787, Unknown=0, NotChecked=0, Total=15500 [2021-11-21 00:24:49,252 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 527 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 1495 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 527 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 1653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:49,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [527 Valid, 243 Invalid, 1653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1495 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 00:24:49,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-21 00:24:49,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 99. [2021-11-21 00:24:49,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:49,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2021-11-21 00:24:49,255 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2021-11-21 00:24:49,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:49,256 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2021-11-21 00:24:49,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 99 states have (on average 2.8484848484848486) internal successors, (282), 99 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:49,256 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2021-11-21 00:24:49,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-21 00:24:49,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:49,257 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 1, 1, 1, 1] [2021-11-21 00:24:49,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-21 00:24:49,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:49,471 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:49,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:49,471 INFO L85 PathProgramCache]: Analyzing trace with hash -377545965, now seen corresponding path program 30 times [2021-11-21 00:24:49,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:49,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040697653] [2021-11-21 00:24:49,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:49,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:49,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:50,443 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 46 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:50,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:50,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040697653] [2021-11-21 00:24:50,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040697653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:50,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054465878] [2021-11-21 00:24:50,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:24:50,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:50,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:50,445 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:50,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-21 00:24:50,625 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:24:50,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:24:50,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 518 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-21 00:24:50,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:24:51,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:24:51,538 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 46 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:51,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:24:51,769 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 [2021-11-21 00:24:51,771 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 [2021-11-21 00:24:52,018 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 46 proven. 675 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:52,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054465878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:24:52,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1438031836] [2021-11-21 00:24:52,020 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:24:52,020 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:24:52,020 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:24:52,020 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:24:52,020 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:24:52,060 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 6 treesize of output 5 [2021-11-21 00:24:52,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:52,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:24:52,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 128 [2021-11-21 00:24:52,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:24:52,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:24:54,711 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:24:55,698 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:24:55,698 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:24:55,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 58 [2021-11-21 00:24:55,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592056220] [2021-11-21 00:24:55,699 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:24:55,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-21 00:24:55,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:24:55,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-21 00:24:55,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=4114, Unknown=0, NotChecked=0, Total=4290 [2021-11-21 00:24:55,701 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand has 59 states, 59 states have (on average 2.4237288135593222) internal successors, (143), 58 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:58,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:24:58,260 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2021-11-21 00:24:58,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 00:24:58,261 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.4237288135593222) internal successors, (143), 58 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-21 00:24:58,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:24:58,262 INFO L225 Difference]: With dead ends: 165 [2021-11-21 00:24:58,262 INFO L226 Difference]: Without dead ends: 102 [2021-11-21 00:24:58,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 261 SyntacticMatches, 3 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1249 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=438, Invalid=9264, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 00:24:58,263 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 145 mSDsluCounter, 673 mSDsCounter, 0 mSdLazyCounter, 3517 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 3579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 3517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:24:58,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 666 Invalid, 3579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 3517 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-21 00:24:58,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-21 00:24:58,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-11-21 00:24:58,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.02) internal successors, (102), 100 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:58,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 102 transitions. [2021-11-21 00:24:58,267 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 102 transitions. Word has length 98 [2021-11-21 00:24:58,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:24:58,267 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 102 transitions. [2021-11-21 00:24:58,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.4237288135593222) internal successors, (143), 58 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:24:58,267 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 102 transitions. [2021-11-21 00:24:58,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2021-11-21 00:24:58,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:24:58,268 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 16, 1, 1, 1, 1] [2021-11-21 00:24:58,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-21 00:24:58,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-21 00:24:58,483 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:24:58,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:24:58,483 INFO L85 PathProgramCache]: Analyzing trace with hash 1704823128, now seen corresponding path program 31 times [2021-11-21 00:24:58,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:24:58,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636715044] [2021-11-21 00:24:58,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:24:58,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:24:58,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:59,404 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 225 proven. 527 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:24:59,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:24:59,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636715044] [2021-11-21 00:24:59,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636715044] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:24:59,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231153418] [2021-11-21 00:24:59,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:24:59,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:24:59,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:24:59,405 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:24:59,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-21 00:24:59,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:24:59,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 92 conjunts are in the unsatisfiable core [2021-11-21 00:24:59,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:00,362 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 225 proven. 527 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:00,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:01,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-21 00:25:01,376 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 225 proven. 527 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:01,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231153418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:01,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [424267809] [2021-11-21 00:25:01,379 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:25:01,379 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:01,379 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:01,380 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:01,380 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:01,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:25:01,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:25:01,682 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:25:01,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:25:01,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:25:02,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:25:04,092 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:04,954 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:04,954 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:04,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 35, 35] total 71 [2021-11-21 00:25:04,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218946022] [2021-11-21 00:25:04,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:04,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-21 00:25:04,955 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:04,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-21 00:25:04,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=729, Invalid=5591, Unknown=0, NotChecked=0, Total=6320 [2021-11-21 00:25:04,956 INFO L87 Difference]: Start difference. First operand 101 states and 102 transitions. Second operand has 73 states, 72 states have (on average 2.8472222222222223) internal successors, (205), 72 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:06,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:06,255 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2021-11-21 00:25:06,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-21 00:25:06,256 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 2.8472222222222223) internal successors, (205), 72 states have internal predecessors, (205), 0 states have call successors, (0), 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 100 [2021-11-21 00:25:06,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:06,257 INFO L225 Difference]: With dead ends: 108 [2021-11-21 00:25:06,257 INFO L226 Difference]: Without dead ends: 108 [2021-11-21 00:25:06,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 252 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2773 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1622, Invalid=8080, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 00:25:06,258 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 633 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 1762 mSolverCounterSat, 198 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 633 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 1960 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 198 IncrementalHoareTripleChecker+Valid, 1762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:06,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [633 Valid, 305 Invalid, 1960 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [198 Valid, 1762 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:25:06,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-21 00:25:06,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 105. [2021-11-21 00:25:06,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0192307692307692) internal successors, (106), 104 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) [2021-11-21 00:25:06,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2021-11-21 00:25:06,261 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 100 [2021-11-21 00:25:06,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:06,261 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2021-11-21 00:25:06,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 2.8472222222222223) internal successors, (205), 72 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:06,261 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2021-11-21 00:25:06,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-21 00:25:06,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:06,262 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 1, 1, 1, 1] [2021-11-21 00:25:06,284 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:06,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-21 00:25:06,463 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:25:06,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:06,463 INFO L85 PathProgramCache]: Analyzing trace with hash -526898419, now seen corresponding path program 32 times [2021-11-21 00:25:06,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:06,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908281540] [2021-11-21 00:25:06,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:06,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:06,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 49 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:07,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:07,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908281540] [2021-11-21 00:25:07,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908281540] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:07,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208699085] [2021-11-21 00:25:07,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:25:07,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:07,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:07,497 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:07,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-21 00:25:08,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-21 00:25:08,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:25:08,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-21 00:25:08,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:09,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:25:09,327 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 49 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:09,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:09,523 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 [2021-11-21 00:25:09,525 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 [2021-11-21 00:25:09,776 INFO L134 CoverageAnalysis]: Checked inductivity of 817 backedges. 49 proven. 768 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:09,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208699085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:09,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1351868015] [2021-11-21 00:25:09,778 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:25:09,778 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:09,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:09,779 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:09,779 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:09,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:25:09,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:25:10,091 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:25:10,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:25:10,297 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 23 treesize of output 19 [2021-11-21 00:25:10,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:25:12,504 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:13,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:13,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:13,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 61 [2021-11-21 00:25:13,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711664783] [2021-11-21 00:25:13,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:13,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-21 00:25:13,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:13,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-21 00:25:13,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=4509, Unknown=0, NotChecked=0, Total=4692 [2021-11-21 00:25:13,477 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand has 62 states, 62 states have (on average 2.435483870967742) internal successors, (151), 61 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:16,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:16,328 INFO L93 Difference]: Finished difference Result 175 states and 176 transitions. [2021-11-21 00:25:16,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 00:25:16,329 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.435483870967742) internal successors, (151), 61 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-21 00:25:16,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:16,329 INFO L225 Difference]: With dead ends: 175 [2021-11-21 00:25:16,329 INFO L226 Difference]: Without dead ends: 108 [2021-11-21 00:25:16,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 278 SyntacticMatches, 3 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1363 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=460, Invalid=10252, Unknown=0, NotChecked=0, Total=10712 [2021-11-21 00:25:16,331 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 207 mSDsluCounter, 795 mSDsCounter, 0 mSdLazyCounter, 4054 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 4225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 4054 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:16,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 790 Invalid, 4225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 4054 Invalid, 0 Unknown, 87 Unchecked, 1.5s Time] [2021-11-21 00:25:16,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-21 00:25:16,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-11-21 00:25:16,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0188679245283019) internal successors, (108), 106 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) [2021-11-21 00:25:16,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2021-11-21 00:25:16,335 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 104 [2021-11-21 00:25:16,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:16,336 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2021-11-21 00:25:16,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.435483870967742) internal successors, (151), 61 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:16,336 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2021-11-21 00:25:16,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:25:16,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:16,337 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 17, 1, 1, 1, 1] [2021-11-21 00:25:16,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2021-11-21 00:25:16,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:16,543 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:25:16,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:16,543 INFO L85 PathProgramCache]: Analyzing trace with hash 2109346194, now seen corresponding path program 33 times [2021-11-21 00:25:16,543 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:16,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325728883] [2021-11-21 00:25:16,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:16,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:16,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:17,502 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 256 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:17,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:17,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325728883] [2021-11-21 00:25:17,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325728883] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:17,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837355780] [2021-11-21 00:25:17,503 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:25:17,503 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:17,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:17,504 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:17,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-21 00:25:17,675 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:25:17,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:25:17,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-21 00:25:17,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:17,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:25:19,019 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 256 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:19,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:21,263 INFO L134 CoverageAnalysis]: Checked inductivity of 850 backedges. 289 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:21,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837355780] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:21,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109333365] [2021-11-21 00:25:21,265 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:25:21,265 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:21,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:21,265 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:21,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:21,301 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 6 treesize of output 5 [2021-11-21 00:25:21,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:25:21,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:25:21,577 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 136 treesize of output 128 [2021-11-21 00:25:21,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:25:21,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:25:23,930 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:25,029 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:25,029 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:25,029 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 90 [2021-11-21 00:25:25,029 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131181855] [2021-11-21 00:25:25,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:25,030 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-21 00:25:25,030 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:25,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-21 00:25:25,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1042, Invalid=8660, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 00:25:25,031 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand has 92 states, 91 states have (on average 3.098901098901099) internal successors, (282), 91 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:26,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:26,546 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2021-11-21 00:25:26,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-21 00:25:26,546 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 3.098901098901099) internal successors, (282), 91 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-21 00:25:26,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:26,547 INFO L225 Difference]: With dead ends: 114 [2021-11-21 00:25:26,547 INFO L226 Difference]: Without dead ends: 114 [2021-11-21 00:25:26,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3842 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2066, Invalid=11976, Unknown=0, NotChecked=0, Total=14042 [2021-11-21 00:25:26,548 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 476 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 2301 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 476 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 2454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 2301 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:26,548 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [476 Valid, 425 Invalid, 2454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 2301 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-21 00:25:26,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-21 00:25:26,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2021-11-21 00:25:26,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:26,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2021-11-21 00:25:26,552 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 106 [2021-11-21 00:25:26,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:26,553 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2021-11-21 00:25:26,553 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 91 states have (on average 3.098901098901099) internal successors, (282), 91 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:26,553 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2021-11-21 00:25:26,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-21 00:25:26,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:26,554 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 1, 1, 1, 1] [2021-11-21 00:25:26,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:26,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-21 00:25:26,775 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:25:26,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:26,775 INFO L85 PathProgramCache]: Analyzing trace with hash 174196295, now seen corresponding path program 34 times [2021-11-21 00:25:26,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:26,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414793948] [2021-11-21 00:25:26,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:26,776 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:26,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:27,935 INFO L134 CoverageAnalysis]: Checked inductivity of 919 backedges. 52 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:27,935 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:27,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414793948] [2021-11-21 00:25:27,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414793948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:27,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2139485688] [2021-11-21 00:25:27,936 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:25:27,936 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:27,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:27,936 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:27,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-21 00:25:28,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:28,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 120 conjunts are in the unsatisfiable core [2021-11-21 00:25:28,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:28,831 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 21 treesize of output 17 [2021-11-21 00:25:29,106 INFO L134 CoverageAnalysis]: Checked inductivity of 919 backedges. 52 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:29,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:29,382 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 [2021-11-21 00:25:29,384 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 [2021-11-21 00:25:29,656 INFO L134 CoverageAnalysis]: Checked inductivity of 919 backedges. 52 proven. 867 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:29,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2139485688] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:29,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1446161596] [2021-11-21 00:25:29,657 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:25:29,657 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:29,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:29,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:29,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:29,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:25:29,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:25:29,963 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:25:29,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:25:30,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:25:30,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:25:32,313 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:33,290 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:33,290 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:33,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 64 [2021-11-21 00:25:33,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497622077] [2021-11-21 00:25:33,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:33,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-21 00:25:33,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:33,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-21 00:25:33,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=4922, Unknown=0, NotChecked=0, Total=5112 [2021-11-21 00:25:33,292 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand has 65 states, 65 states have (on average 2.4461538461538463) internal successors, (159), 64 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) [2021-11-21 00:25:36,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:36,429 INFO L93 Difference]: Finished difference Result 185 states and 186 transitions. [2021-11-21 00:25:36,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-21 00:25:36,430 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.4461538461538463) internal successors, (159), 64 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 110 [2021-11-21 00:25:36,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:36,430 INFO L225 Difference]: With dead ends: 185 [2021-11-21 00:25:36,431 INFO L226 Difference]: Without dead ends: 114 [2021-11-21 00:25:36,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 295 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1482 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=482, Invalid=11290, Unknown=0, NotChecked=0, Total=11772 [2021-11-21 00:25:36,432 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 166 mSDsluCounter, 841 mSDsCounter, 0 mSdLazyCounter, 4421 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 836 SdHoareTripleChecker+Invalid, 4492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 4421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:36,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 836 Invalid, 4492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 4421 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-21 00:25:36,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-21 00:25:36,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2021-11-21 00:25:36,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0178571428571428) internal successors, (114), 112 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:36,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 114 transitions. [2021-11-21 00:25:36,436 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 114 transitions. Word has length 110 [2021-11-21 00:25:36,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:36,437 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 114 transitions. [2021-11-21 00:25:36,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.4461538461538463) internal successors, (159), 64 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) [2021-11-21 00:25:36,437 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 114 transitions. [2021-11-21 00:25:36,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-21 00:25:36,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:36,438 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 18, 1, 1, 1, 1] [2021-11-21 00:25:36,471 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-21 00:25:36,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-21 00:25:36,651 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:25:36,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:36,651 INFO L85 PathProgramCache]: Analyzing trace with hash -543410932, now seen corresponding path program 35 times [2021-11-21 00:25:36,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:36,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246506586] [2021-11-21 00:25:36,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:36,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:36,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:37,700 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 289 proven. 665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:37,700 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:37,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246506586] [2021-11-21 00:25:37,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246506586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:37,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610705003] [2021-11-21 00:25:37,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:25:37,701 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:37,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:37,702 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:37,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-21 00:25:38,147 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-21 00:25:38,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:25:38,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 588 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-21 00:25:38,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:38,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:25:40,045 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 289 proven. 665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:40,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:42,608 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 324 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:42,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610705003] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:42,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363740917] [2021-11-21 00:25:42,609 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:25:42,610 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:42,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:42,610 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:42,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:42,649 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 6 treesize of output 5 [2021-11-21 00:25:42,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:25:42,925 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:25:42,925 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:25:43,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:25:43,260 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 [2021-11-21 00:25:45,324 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:46,365 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:46,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:46,365 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39, 39] total 116 [2021-11-21 00:25:46,365 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864683922] [2021-11-21 00:25:46,365 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:46,366 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2021-11-21 00:25:46,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:46,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2021-11-21 00:25:46,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2014, Invalid=13486, Unknown=0, NotChecked=0, Total=15500 [2021-11-21 00:25:46,367 INFO L87 Difference]: Start difference. First operand 113 states and 114 transitions. Second operand has 118 states, 117 states have (on average 2.871794871794872) internal successors, (336), 117 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) [2021-11-21 00:25:48,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:48,139 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2021-11-21 00:25:48,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 00:25:48,139 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 117 states have (on average 2.871794871794872) internal successors, (336), 117 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) Word has length 112 [2021-11-21 00:25:48,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:48,140 INFO L225 Difference]: With dead ends: 120 [2021-11-21 00:25:48,140 INFO L226 Difference]: Without dead ends: 120 [2021-11-21 00:25:48,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 249 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7160 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=3727, Invalid=17443, Unknown=0, NotChecked=0, Total=21170 [2021-11-21 00:25:48,143 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 889 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 1840 mSolverCounterSat, 263 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 889 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 2103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 263 IncrementalHoareTripleChecker+Valid, 1840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:48,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [889 Valid, 335 Invalid, 2103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [263 Valid, 1840 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:25:48,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-21 00:25:48,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 117. [2021-11-21 00:25:48,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0172413793103448) internal successors, (118), 116 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:48,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2021-11-21 00:25:48,147 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 112 [2021-11-21 00:25:48,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:48,147 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2021-11-21 00:25:48,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 117 states have (on average 2.871794871794872) internal successors, (336), 117 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) [2021-11-21 00:25:48,148 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2021-11-21 00:25:48,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-21 00:25:48,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:48,149 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 1, 1, 1, 1] [2021-11-21 00:25:48,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:48,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:48,363 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:25:48,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:48,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1624122175, now seen corresponding path program 36 times [2021-11-21 00:25:48,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:48,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617445752] [2021-11-21 00:25:48,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:48,364 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:48,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:49,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 55 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:49,426 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:49,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617445752] [2021-11-21 00:25:49,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617445752] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:49,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374943735] [2021-11-21 00:25:49,427 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:25:49,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:49,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:49,428 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:49,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-21 00:25:49,623 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:25:49,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:25:49,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 608 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-21 00:25:49,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:25:50,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:25:50,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 55 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:50,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:25:50,980 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 [2021-11-21 00:25:50,982 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 [2021-11-21 00:25:51,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 55 proven. 972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:51,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1374943735] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:25:51,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [964826611] [2021-11-21 00:25:51,259 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:25:51,259 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:25:51,259 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:25:51,260 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:25:51,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:25:51,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:25:51,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:25:51,586 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:25:51,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:25:51,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:25:51,944 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 [2021-11-21 00:25:53,962 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:25:54,994 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:25:54,994 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:25:54,994 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 67 [2021-11-21 00:25:54,994 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399695372] [2021-11-21 00:25:54,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:25:54,995 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-21 00:25:54,995 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:25:54,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-21 00:25:54,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=5353, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 00:25:54,996 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand has 68 states, 68 states have (on average 2.4558823529411766) internal successors, (167), 67 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) [2021-11-21 00:25:58,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:25:58,413 INFO L93 Difference]: Finished difference Result 195 states and 196 transitions. [2021-11-21 00:25:58,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-21 00:25:58,413 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.4558823529411766) internal successors, (167), 67 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 116 [2021-11-21 00:25:58,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:25:58,414 INFO L225 Difference]: With dead ends: 195 [2021-11-21 00:25:58,414 INFO L226 Difference]: Without dead ends: 120 [2021-11-21 00:25:58,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 312 SyntacticMatches, 3 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1606 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=504, Invalid=12378, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 00:25:58,416 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 229 mSDsluCounter, 906 mSDsCounter, 0 mSdLazyCounter, 4742 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 4835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 4742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:25:58,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [229 Valid, 900 Invalid, 4835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 4742 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-21 00:25:58,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-21 00:25:58,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2021-11-21 00:25:58,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0169491525423728) internal successors, (120), 118 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:25:58,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2021-11-21 00:25:58,420 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 116 [2021-11-21 00:25:58,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:25:58,420 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2021-11-21 00:25:58,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.4558823529411766) internal successors, (167), 67 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) [2021-11-21 00:25:58,420 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2021-11-21 00:25:58,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-21 00:25:58,421 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:25:58,421 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 19, 1, 1, 1, 1] [2021-11-21 00:25:58,446 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-21 00:25:58,630 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:58,631 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:25:58,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:25:58,631 INFO L85 PathProgramCache]: Analyzing trace with hash 884810694, now seen corresponding path program 37 times [2021-11-21 00:25:58,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:25:58,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641304403] [2021-11-21 00:25:58,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:25:58,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:25:58,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:59,702 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 324 proven. 740 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:25:59,702 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:25:59,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641304403] [2021-11-21 00:25:59,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641304403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:25:59,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135134475] [2021-11-21 00:25:59,703 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:25:59,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:25:59,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:25:59,711 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:25:59,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-21 00:25:59,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:25:59,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-21 00:25:59,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:00,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 324 proven. 740 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:00,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:02,038 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 [2021-11-21 00:26:02,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1064 backedges. 324 proven. 740 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:02,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135134475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:02,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [150842202] [2021-11-21 00:26:02,153 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:26:02,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:02,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:02,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:02,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:02,163 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 6 treesize of output 5 [2021-11-21 00:26:02,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:26:02,493 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:26:02,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:26:02,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:02,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:26:04,885 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:05,789 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:05,790 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:05,790 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 41, 41] total 83 [2021-11-21 00:26:05,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003493283] [2021-11-21 00:26:05,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:05,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-21 00:26:05,791 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:05,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-21 00:26:05,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=969, Invalid=7403, Unknown=0, NotChecked=0, Total=8372 [2021-11-21 00:26:05,792 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand has 85 states, 84 states have (on average 2.869047619047619) internal successors, (241), 84 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:07,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:07,530 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2021-11-21 00:26:07,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-21 00:26:07,530 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 2.869047619047619) internal successors, (241), 84 states have internal predecessors, (241), 0 states have call successors, (0), 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 118 [2021-11-21 00:26:07,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:07,531 INFO L225 Difference]: With dead ends: 126 [2021-11-21 00:26:07,531 INFO L226 Difference]: Without dead ends: 126 [2021-11-21 00:26:07,532 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 300 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3682 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2168, Invalid=10714, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 00:26:07,533 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 531 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 2527 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 2691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 2527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:07,533 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [531 Valid, 451 Invalid, 2691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 2527 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 00:26:07,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-21 00:26:07,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2021-11-21 00:26:07,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:07,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2021-11-21 00:26:07,537 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 118 [2021-11-21 00:26:07,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:07,537 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2021-11-21 00:26:07,538 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 2.869047619047619) internal successors, (241), 84 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:07,538 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2021-11-21 00:26:07,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-21 00:26:07,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:07,539 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 1, 1, 1, 1] [2021-11-21 00:26:07,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:07,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-21 00:26:07,759 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:26:07,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:07,759 INFO L85 PathProgramCache]: Analyzing trace with hash -2006393221, now seen corresponding path program 38 times [2021-11-21 00:26:07,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:07,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564794309] [2021-11-21 00:26:07,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:07,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:07,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:09,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1141 backedges. 58 proven. 1083 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:09,067 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:09,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564794309] [2021-11-21 00:26:09,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564794309] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:09,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032120413] [2021-11-21 00:26:09,068 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:09,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:09,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:09,069 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:09,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-21 00:26:09,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-21 00:26:09,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:09,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-21 00:26:09,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:10,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:26:11,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1141 backedges. 58 proven. 1083 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:11,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:11,466 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 [2021-11-21 00:26:11,467 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 [2021-11-21 00:26:11,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1141 backedges. 58 proven. 1083 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:11,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032120413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:11,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [959686189] [2021-11-21 00:26:11,761 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:26:11,761 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:11,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:11,762 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:11,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:11,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:26:11,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:12,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:12,058 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 136 treesize of output 128 [2021-11-21 00:26:12,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:12,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:26:14,398 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:15,486 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:15,486 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:15,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 70 [2021-11-21 00:26:15,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661337797] [2021-11-21 00:26:15,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:15,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-21 00:26:15,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:15,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-21 00:26:15,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=5802, Unknown=0, NotChecked=0, Total=6006 [2021-11-21 00:26:15,487 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand has 71 states, 71 states have (on average 2.464788732394366) internal successors, (175), 70 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:19,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:19,087 INFO L93 Difference]: Finished difference Result 205 states and 206 transitions. [2021-11-21 00:26:19,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-21 00:26:19,087 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 2.464788732394366) internal successors, (175), 70 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2021-11-21 00:26:19,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:19,088 INFO L225 Difference]: With dead ends: 205 [2021-11-21 00:26:19,088 INFO L226 Difference]: Without dead ends: 126 [2021-11-21 00:26:19,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 329 SyntacticMatches, 3 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1735 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=526, Invalid=13516, Unknown=0, NotChecked=0, Total=14042 [2021-11-21 00:26:19,089 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 242 mSDsluCounter, 939 mSDsCounter, 0 mSdLazyCounter, 4804 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 5005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 4804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:19,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [242 Valid, 930 Invalid, 5005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 4804 Invalid, 0 Unknown, 103 Unchecked, 1.8s Time] [2021-11-21 00:26:19,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-21 00:26:19,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-11-21 00:26:19,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.0161290322580645) internal successors, (126), 124 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) [2021-11-21 00:26:19,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 126 transitions. [2021-11-21 00:26:19,094 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 126 transitions. Word has length 122 [2021-11-21 00:26:19,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:19,094 INFO L470 AbstractCegarLoop]: Abstraction has 125 states and 126 transitions. [2021-11-21 00:26:19,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 2.464788732394366) internal successors, (175), 70 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:19,094 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 126 transitions. [2021-11-21 00:26:19,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-21 00:26:19,095 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:19,095 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 20, 1, 1, 1, 1] [2021-11-21 00:26:19,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:19,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-21 00:26:19,308 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:26:19,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:19,309 INFO L85 PathProgramCache]: Analyzing trace with hash 1822559680, now seen corresponding path program 39 times [2021-11-21 00:26:19,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:19,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079315241] [2021-11-21 00:26:19,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:19,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:19,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:20,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 361 proven. 819 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:20,373 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:20,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079315241] [2021-11-21 00:26:20,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079315241] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:20,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016508023] [2021-11-21 00:26:20,374 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:26:20,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:20,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:20,375 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:20,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-21 00:26:20,612 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:26:20,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:20,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-21 00:26:20,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:20,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-21 00:26:22,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 361 proven. 819 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:22,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:25,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 400 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:25,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016508023] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:25,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1076555404] [2021-11-21 00:26:25,101 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:26:25,101 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:25,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:25,101 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:25,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:25,135 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 6 treesize of output 5 [2021-11-21 00:26:25,218 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 20 treesize of output 16 [2021-11-21 00:26:25,424 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:26:25,424 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 136 treesize of output 135 [2021-11-21 00:26:25,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:25,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:26:28,004 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:29,171 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:29,171 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:29,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 105 [2021-11-21 00:26:29,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193774776] [2021-11-21 00:26:29,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:29,172 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-21 00:26:29,172 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:29,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-21 00:26:29,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1369, Invalid=11513, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 00:26:29,174 INFO L87 Difference]: Start difference. First operand 125 states and 126 transitions. Second operand has 107 states, 106 states have (on average 3.1132075471698113) internal successors, (330), 106 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) [2021-11-21 00:26:31,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:31,216 INFO L93 Difference]: Finished difference Result 132 states and 133 transitions. [2021-11-21 00:26:31,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-21 00:26:31,216 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 106 states have (on average 3.1132075471698113) internal successors, (330), 106 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) Word has length 124 [2021-11-21 00:26:31,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:31,219 INFO L225 Difference]: With dead ends: 132 [2021-11-21 00:26:31,219 INFO L226 Difference]: Without dead ends: 132 [2021-11-21 00:26:31,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5144 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=2720, Invalid=15912, Unknown=0, NotChecked=0, Total=18632 [2021-11-21 00:26:31,220 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 825 mSDsluCounter, 603 mSDsCounter, 0 mSdLazyCounter, 3167 mSolverCounterSat, 264 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 825 SdHoareTripleChecker+Valid, 624 SdHoareTripleChecker+Invalid, 3431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 264 IncrementalHoareTripleChecker+Valid, 3167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:31,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [825 Valid, 624 Invalid, 3431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [264 Valid, 3167 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 00:26:31,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-21 00:26:31,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 129. [2021-11-21 00:26:31,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.015625) internal successors, (130), 128 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:31,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2021-11-21 00:26:31,224 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2021-11-21 00:26:31,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:31,225 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2021-11-21 00:26:31,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 106 states have (on average 3.1132075471698113) internal successors, (330), 106 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) [2021-11-21 00:26:31,225 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2021-11-21 00:26:31,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-21 00:26:31,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:31,226 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 1, 1, 1, 1] [2021-11-21 00:26:31,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:31,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-21 00:26:31,455 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:26:31,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:31,455 INFO L85 PathProgramCache]: Analyzing trace with hash 259275637, now seen corresponding path program 40 times [2021-11-21 00:26:31,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:31,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164572546] [2021-11-21 00:26:31,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:31,456 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:31,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:32,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1261 backedges. 61 proven. 1200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:32,691 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:32,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164572546] [2021-11-21 00:26:32,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164572546] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:32,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947840960] [2021-11-21 00:26:32,692 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:26:32,692 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:32,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:32,693 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:32,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-21 00:26:32,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:32,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-21 00:26:32,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:33,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:26:34,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1261 backedges. 61 proven. 1200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:34,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:34,427 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 [2021-11-21 00:26:34,428 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 [2021-11-21 00:26:34,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1261 backedges. 61 proven. 1200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:34,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1947840960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:34,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2120185731] [2021-11-21 00:26:34,730 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:26:34,730 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:34,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:34,730 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:34,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:34,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:26:34,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:35,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:35,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 128 [2021-11-21 00:26:35,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:35,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:26:37,405 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:38,514 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:38,515 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:38,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 73 [2021-11-21 00:26:38,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034200371] [2021-11-21 00:26:38,515 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:38,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-21 00:26:38,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:38,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-21 00:26:38,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=6269, Unknown=0, NotChecked=0, Total=6480 [2021-11-21 00:26:38,517 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand has 74 states, 74 states have (on average 2.472972972972973) internal successors, (183), 73 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:42,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:42,559 INFO L93 Difference]: Finished difference Result 215 states and 216 transitions. [2021-11-21 00:26:42,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-21 00:26:42,559 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.472972972972973) internal successors, (183), 73 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2021-11-21 00:26:42,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:42,560 INFO L225 Difference]: With dead ends: 215 [2021-11-21 00:26:42,561 INFO L226 Difference]: Without dead ends: 132 [2021-11-21 00:26:42,562 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 346 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1869 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=548, Invalid=14704, Unknown=0, NotChecked=0, Total=15252 [2021-11-21 00:26:42,563 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 195 mSDsluCounter, 1126 mSDsCounter, 0 mSdLazyCounter, 5789 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 1121 SdHoareTripleChecker+Invalid, 5976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 5789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:42,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 1121 Invalid, 5976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 5789 Invalid, 0 Unknown, 103 Unchecked, 2.2s Time] [2021-11-21 00:26:42,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-21 00:26:42,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2021-11-21 00:26:42,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 130 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) [2021-11-21 00:26:42,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 132 transitions. [2021-11-21 00:26:42,567 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 132 transitions. Word has length 128 [2021-11-21 00:26:42,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:42,567 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 132 transitions. [2021-11-21 00:26:42,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.472972972972973) internal successors, (183), 73 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:42,568 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 132 transitions. [2021-11-21 00:26:42,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-21 00:26:42,569 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:42,569 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 21, 1, 1, 1, 1] [2021-11-21 00:26:42,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:42,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:42,795 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:26:42,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:42,795 INFO L85 PathProgramCache]: Analyzing trace with hash -1411636486, now seen corresponding path program 41 times [2021-11-21 00:26:42,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:42,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637134787] [2021-11-21 00:26:42,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:42,796 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:42,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:44,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 400 proven. 902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:44,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:44,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637134787] [2021-11-21 00:26:44,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637134787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:44,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918520563] [2021-11-21 00:26:44,026 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:26:44,027 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:44,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:44,027 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:44,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-21 00:26:45,218 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-11-21 00:26:45,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:45,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-21 00:26:45,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:45,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-21 00:26:47,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 400 proven. 902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:47,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:26:50,915 INFO L134 CoverageAnalysis]: Checked inductivity of 1302 backedges. 441 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:50,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918520563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:26:50,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1364755362] [2021-11-21 00:26:50,916 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:26:50,916 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:26:50,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:26:50,917 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:26:50,917 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:26:50,953 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 6 treesize of output 5 [2021-11-21 00:26:51,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:51,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:26:51,215 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 136 treesize of output 128 [2021-11-21 00:26:51,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:26:51,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:26:53,574 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:26:54,734 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:26:54,734 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:26:54,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 45] total 134 [2021-11-21 00:26:54,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995058215] [2021-11-21 00:26:54,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:26:54,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-21 00:26:54,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:26:54,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-21 00:26:54,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2656, Invalid=17650, Unknown=0, NotChecked=0, Total=20306 [2021-11-21 00:26:54,739 INFO L87 Difference]: Start difference. First operand 131 states and 132 transitions. Second operand has 136 states, 135 states have (on average 2.888888888888889) internal successors, (390), 135 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:56,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:26:56,786 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2021-11-21 00:26:56,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-21 00:26:56,786 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 135 states have (on average 2.888888888888889) internal successors, (390), 135 states have internal predecessors, (390), 0 states have call successors, (0), 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 130 [2021-11-21 00:26:56,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:26:56,787 INFO L225 Difference]: With dead ends: 138 [2021-11-21 00:26:56,788 INFO L226 Difference]: Without dead ends: 138 [2021-11-21 00:26:56,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 291 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9449 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=4903, Invalid=22819, Unknown=0, NotChecked=0, Total=27722 [2021-11-21 00:26:56,790 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 794 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 1929 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 794 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 2146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 1929 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:26:56,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [794 Valid, 413 Invalid, 2146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 1929 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:26:56,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-21 00:26:56,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 135. [2021-11-21 00:26:56,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:56,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2021-11-21 00:26:56,794 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 130 [2021-11-21 00:26:56,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:26:56,795 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2021-11-21 00:26:56,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 135 states have (on average 2.888888888888889) internal successors, (390), 135 states have internal predecessors, (390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:26:56,796 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2021-11-21 00:26:56,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-21 00:26:56,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:26:56,797 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 1, 1, 1, 1] [2021-11-21 00:26:56,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-21 00:26:57,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-21 00:26:57,011 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:26:57,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:26:57,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1288512431, now seen corresponding path program 42 times [2021-11-21 00:26:57,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:26:57,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [685765804] [2021-11-21 00:26:57,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:26:57,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:26:57,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:26:58,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 64 proven. 1323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:26:58,420 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:26:58,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [685765804] [2021-11-21 00:26:58,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [685765804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:26:58,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568441498] [2021-11-21 00:26:58,420 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:26:58,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:26:58,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:26:58,421 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:26:58,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-21 00:26:58,705 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:26:58,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:26:58,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 144 conjunts are in the unsatisfiable core [2021-11-21 00:26:58,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:26:59,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:27:00,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 64 proven. 1323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:00,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:00,407 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 [2021-11-21 00:27:00,408 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 [2021-11-21 00:27:00,730 INFO L134 CoverageAnalysis]: Checked inductivity of 1387 backedges. 64 proven. 1323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:00,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568441498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:00,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410639229] [2021-11-21 00:27:00,731 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:27:00,732 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:00,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:00,732 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:00,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:00,789 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 6 treesize of output 5 [2021-11-21 00:27:00,866 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 20 treesize of output 16 [2021-11-21 00:27:01,035 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:27:01,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:27:01,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:27:01,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:27:03,422 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:04,529 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:04,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:04,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 76 [2021-11-21 00:27:04,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60224709] [2021-11-21 00:27:04,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:04,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-21 00:27:04,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:04,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-21 00:27:04,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=6754, Unknown=0, NotChecked=0, Total=6972 [2021-11-21 00:27:04,531 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand has 77 states, 77 states have (on average 2.4805194805194803) internal successors, (191), 76 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:09,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:09,385 INFO L93 Difference]: Finished difference Result 225 states and 226 transitions. [2021-11-21 00:27:09,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-21 00:27:09,386 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 2.4805194805194803) internal successors, (191), 76 states have internal predecessors, (191), 0 states have call successors, (0), 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 134 [2021-11-21 00:27:09,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:09,387 INFO L225 Difference]: With dead ends: 225 [2021-11-21 00:27:09,387 INFO L226 Difference]: Without dead ends: 138 [2021-11-21 00:27:09,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2008 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=570, Invalid=15942, Unknown=0, NotChecked=0, Total=16512 [2021-11-21 00:27:09,388 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 200 mSDsluCounter, 1277 mSDsCounter, 0 mSdLazyCounter, 6658 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 1267 SdHoareTripleChecker+Invalid, 6744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 6658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:09,388 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 1267 Invalid, 6744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 6658 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-21 00:27:09,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-21 00:27:09,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2021-11-21 00:27:09,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.0147058823529411) internal successors, (138), 136 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:09,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2021-11-21 00:27:09,392 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 134 [2021-11-21 00:27:09,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:09,392 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2021-11-21 00:27:09,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 2.4805194805194803) internal successors, (191), 76 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:09,393 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2021-11-21 00:27:09,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 00:27:09,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:09,393 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 22, 1, 1, 1, 1] [2021-11-21 00:27:09,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:09,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-21 00:27:09,603 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:27:09,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:09,603 INFO L85 PathProgramCache]: Analyzing trace with hash -83324044, now seen corresponding path program 43 times [2021-11-21 00:27:09,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:09,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397669380] [2021-11-21 00:27:09,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:09,604 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:09,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:10,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 441 proven. 989 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:10,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:10,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397669380] [2021-11-21 00:27:10,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397669380] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:10,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838709917] [2021-11-21 00:27:10,951 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:27:10,951 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:10,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:10,959 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:10,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-21 00:27:11,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:11,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 122 conjunts are in the unsatisfiable core [2021-11-21 00:27:11,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:12,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 441 proven. 989 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:12,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:13,868 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 [2021-11-21 00:27:14,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 441 proven. 989 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:14,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838709917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:14,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [898088525] [2021-11-21 00:27:14,026 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:27:14,026 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:14,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:14,027 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:14,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:14,041 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 6 treesize of output 5 [2021-11-21 00:27:14,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:27:14,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:27:14,409 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 136 treesize of output 128 [2021-11-21 00:27:14,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:27:14,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:27:16,781 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:17,830 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:17,830 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:17,830 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 47, 47] total 95 [2021-11-21 00:27:17,830 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303277689] [2021-11-21 00:27:17,830 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:17,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 00:27:17,831 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:17,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 00:27:17,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1245, Invalid=9467, Unknown=0, NotChecked=0, Total=10712 [2021-11-21 00:27:17,832 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand has 97 states, 96 states have (on average 2.8854166666666665) internal successors, (277), 96 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:20,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:20,052 INFO L93 Difference]: Finished difference Result 144 states and 145 transitions. [2021-11-21 00:27:20,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-21 00:27:20,053 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 2.8854166666666665) internal successors, (277), 96 states have internal predecessors, (277), 0 states have call successors, (0), 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 136 [2021-11-21 00:27:20,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:20,054 INFO L225 Difference]: With dead ends: 144 [2021-11-21 00:27:20,054 INFO L226 Difference]: Without dead ends: 144 [2021-11-21 00:27:20,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 477 GetRequests, 348 SyntacticMatches, 2 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4717 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2795, Invalid=13717, Unknown=0, NotChecked=0, Total=16512 [2021-11-21 00:27:20,056 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 302 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 3472 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 3554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 3472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:20,057 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [302 Valid, 596 Invalid, 3554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 3472 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 00:27:20,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-21 00:27:20,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 141. [2021-11-21 00:27:20,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0142857142857142) internal successors, (142), 140 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:20,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2021-11-21 00:27:20,061 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 136 [2021-11-21 00:27:20,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:20,061 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2021-11-21 00:27:20,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 2.8854166666666665) internal successors, (277), 96 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:20,061 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2021-11-21 00:27:20,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-21 00:27:20,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:20,063 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 1, 1, 1, 1] [2021-11-21 00:27:20,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:20,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:20,271 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:27:20,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:20,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1459144489, now seen corresponding path program 44 times [2021-11-21 00:27:20,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:20,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440303446] [2021-11-21 00:27:20,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:20,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:20,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:21,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1519 backedges. 67 proven. 1452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:21,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:21,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440303446] [2021-11-21 00:27:21,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440303446] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:21,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417063998] [2021-11-21 00:27:21,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:27:21,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:21,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:21,680 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:21,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-21 00:27:24,303 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 00:27:24,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:27:24,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 150 conjunts are in the unsatisfiable core [2021-11-21 00:27:24,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:25,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:27:25,849 INFO L134 CoverageAnalysis]: Checked inductivity of 1519 backedges. 67 proven. 1452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:25,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:26,114 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 [2021-11-21 00:27:26,116 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 [2021-11-21 00:27:26,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1519 backedges. 67 proven. 1452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:26,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417063998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:26,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1760703389] [2021-11-21 00:27:26,448 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:27:26,448 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:26,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:26,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:26,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:26,493 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 6 treesize of output 5 [2021-11-21 00:27:26,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:27:26,787 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:27:26,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:27:27,021 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 23 treesize of output 19 [2021-11-21 00:27:27,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:27:29,144 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:30,305 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:30,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:30,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 79 [2021-11-21 00:27:30,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480880140] [2021-11-21 00:27:30,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:30,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-21 00:27:30,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:30,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-21 00:27:30,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=7257, Unknown=0, NotChecked=0, Total=7482 [2021-11-21 00:27:30,307 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand has 80 states, 80 states have (on average 2.4875) internal successors, (199), 79 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:34,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:34,994 INFO L93 Difference]: Finished difference Result 235 states and 236 transitions. [2021-11-21 00:27:34,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-11-21 00:27:34,995 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 2.4875) internal successors, (199), 79 states have internal predecessors, (199), 0 states have call successors, (0), 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 140 [2021-11-21 00:27:34,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:34,996 INFO L225 Difference]: With dead ends: 235 [2021-11-21 00:27:34,996 INFO L226 Difference]: Without dead ends: 144 [2021-11-21 00:27:34,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 515 GetRequests, 380 SyntacticMatches, 3 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2152 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=592, Invalid=17230, Unknown=0, NotChecked=0, Total=17822 [2021-11-21 00:27:34,997 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 212 mSDsluCounter, 1279 mSDsCounter, 0 mSdLazyCounter, 6569 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 1273 SdHoareTripleChecker+Invalid, 6731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 6569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:34,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 1273 Invalid, 6731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 6569 Invalid, 0 Unknown, 70 Unchecked, 2.5s Time] [2021-11-21 00:27:34,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-11-21 00:27:35,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2021-11-21 00:27:35,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0140845070422535) internal successors, (144), 142 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:35,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 144 transitions. [2021-11-21 00:27:35,001 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 144 transitions. Word has length 140 [2021-11-21 00:27:35,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:35,002 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 144 transitions. [2021-11-21 00:27:35,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 2.4875) internal successors, (199), 79 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:35,002 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 144 transitions. [2021-11-21 00:27:35,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-21 00:27:35,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:35,003 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 23, 1, 1, 1, 1] [2021-11-21 00:27:35,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:35,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-21 00:27:35,226 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:27:35,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:35,227 INFO L85 PathProgramCache]: Analyzing trace with hash -1244623058, now seen corresponding path program 45 times [2021-11-21 00:27:35,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:35,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228906980] [2021-11-21 00:27:35,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:35,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:35,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:36,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 484 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:36,549 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:36,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228906980] [2021-11-21 00:27:36,549 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [228906980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:36,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441647699] [2021-11-21 00:27:36,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:27:36,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:36,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:36,551 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:36,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-21 00:27:36,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:27:36,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:27:36,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 738 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-21 00:27:36,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:37,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:27:38,772 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 484 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:38,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:42,457 INFO L134 CoverageAnalysis]: Checked inductivity of 1564 backedges. 529 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:42,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441647699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:42,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1384375012] [2021-11-21 00:27:42,458 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:27:42,458 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:42,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:42,458 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:42,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:42,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:27:42,596 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 20 treesize of output 16 [2021-11-21 00:27:42,760 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:27:42,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:27:43,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:27:43,123 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 [2021-11-21 00:27:45,171 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:46,489 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:46,489 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:46,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 120 [2021-11-21 00:27:46,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530765315] [2021-11-21 00:27:46,489 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:46,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2021-11-21 00:27:46,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:46,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2021-11-21 00:27:46,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1741, Invalid=14771, Unknown=0, NotChecked=0, Total=16512 [2021-11-21 00:27:46,491 INFO L87 Difference]: Start difference. First operand 143 states and 144 transitions. Second operand has 122 states, 121 states have (on average 3.12396694214876) internal successors, (378), 121 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:49,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:27:49,025 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2021-11-21 00:27:49,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-21 00:27:49,026 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 121 states have (on average 3.12396694214876) internal successors, (378), 121 states have internal predecessors, (378), 0 states have call successors, (0), 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 142 [2021-11-21 00:27:49,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:27:49,027 INFO L225 Difference]: With dead ends: 150 [2021-11-21 00:27:49,027 INFO L226 Difference]: Without dead ends: 150 [2021-11-21 00:27:49,028 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6635 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=3464, Invalid=20406, Unknown=0, NotChecked=0, Total=23870 [2021-11-21 00:27:49,028 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 624 mSDsluCounter, 807 mSDsCounter, 0 mSdLazyCounter, 4058 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 831 SdHoareTripleChecker+Invalid, 4259 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 4058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:27:49,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 831 Invalid, 4259 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 4058 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-21 00:27:49,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-21 00:27:49,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 147. [2021-11-21 00:27:49,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 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) [2021-11-21 00:27:49,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2021-11-21 00:27:49,030 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 142 [2021-11-21 00:27:49,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:27:49,030 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2021-11-21 00:27:49,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 121 states have (on average 3.12396694214876) internal successors, (378), 121 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:27:49,031 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2021-11-21 00:27:49,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-21 00:27:49,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:27:49,031 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 1, 1, 1, 1] [2021-11-21 00:27:49,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-21 00:27:49,232 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-21 00:27:49,232 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:27:49,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:27:49,232 INFO L85 PathProgramCache]: Analyzing trace with hash 831018467, now seen corresponding path program 46 times [2021-11-21 00:27:49,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:27:49,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272114510] [2021-11-21 00:27:49,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:27:49,233 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:27:49,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:50,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1657 backedges. 70 proven. 1587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:50,933 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:27:50,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272114510] [2021-11-21 00:27:50,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272114510] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:27:50,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182321840] [2021-11-21 00:27:50,933 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:27:50,933 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:27:50,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:27:50,934 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:27:50,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-21 00:27:51,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:27:51,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 758 conjuncts, 156 conjunts are in the unsatisfiable core [2021-11-21 00:27:51,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:27:52,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:27:52,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1657 backedges. 70 proven. 1587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:52,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:27:53,004 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 [2021-11-21 00:27:53,006 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 [2021-11-21 00:27:53,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1657 backedges. 70 proven. 1587 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:27:53,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182321840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:27:53,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [237215888] [2021-11-21 00:27:53,343 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:27:53,343 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:27:53,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:27:53,344 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:27:53,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:27:53,386 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 6 treesize of output 5 [2021-11-21 00:27:53,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:27:53,664 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:27:53,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:27:53,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:27:54,000 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 14 treesize of output 10 [2021-11-21 00:27:56,069 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:27:57,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:27:57,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:27:57,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 82 [2021-11-21 00:27:57,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883894434] [2021-11-21 00:27:57,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:27:57,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-21 00:27:57,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:27:57,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-21 00:27:57,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=7778, Unknown=0, NotChecked=0, Total=8010 [2021-11-21 00:27:57,252 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand has 83 states, 83 states have (on average 2.4939759036144578) internal successors, (207), 82 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:02,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:02,359 INFO L93 Difference]: Finished difference Result 245 states and 246 transitions. [2021-11-21 00:28:02,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-21 00:28:02,359 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 2.4939759036144578) internal successors, (207), 82 states have internal predecessors, (207), 0 states have call successors, (0), 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 146 [2021-11-21 00:28:02,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:02,360 INFO L225 Difference]: With dead ends: 245 [2021-11-21 00:28:02,360 INFO L226 Difference]: Without dead ends: 150 [2021-11-21 00:28:02,361 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 397 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2301 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=614, Invalid=18568, Unknown=0, NotChecked=0, Total=19182 [2021-11-21 00:28:02,361 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 218 mSDsluCounter, 1410 mSDsCounter, 0 mSdLazyCounter, 7339 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 1403 SdHoareTripleChecker+Invalid, 7433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 7339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:02,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 1403 Invalid, 7433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 7339 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-21 00:28:02,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-11-21 00:28:02,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-11-21 00:28:02,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.0135135135135136) internal successors, (150), 148 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:02,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2021-11-21 00:28:02,363 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 146 [2021-11-21 00:28:02,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:02,364 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2021-11-21 00:28:02,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 2.4939759036144578) internal successors, (207), 82 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:02,364 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2021-11-21 00:28:02,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-21 00:28:02,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:02,365 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 24, 1, 1, 1, 1] [2021-11-21 00:28:02,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:02,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:02,565 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:28:02,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:02,566 INFO L85 PathProgramCache]: Analyzing trace with hash -1175894488, now seen corresponding path program 47 times [2021-11-21 00:28:02,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:02,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842642824] [2021-11-21 00:28:02,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:02,566 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:02,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:03,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 529 proven. 1175 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:03,908 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:03,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842642824] [2021-11-21 00:28:03,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842642824] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:03,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197180699] [2021-11-21 00:28:03,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:28:03,908 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:03,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:03,909 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:03,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-21 00:28:05,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-21 00:28:05,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:05,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 768 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-21 00:28:05,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:05,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:28:08,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 529 proven. 1175 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:08,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:12,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 576 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:12,854 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197180699] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:12,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [270463922] [2021-11-21 00:28:12,855 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:28:12,855 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:12,856 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:12,856 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:12,856 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:12,889 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 6 treesize of output 5 [2021-11-21 00:28:12,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:13,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:28:13,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 128 [2021-11-21 00:28:13,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:13,387 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 [2021-11-21 00:28:15,544 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:16,821 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:16,822 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:16,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51, 51] total 152 [2021-11-21 00:28:16,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404804793] [2021-11-21 00:28:16,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:16,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-21 00:28:16,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:16,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-21 00:28:16,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3388, Invalid=22372, Unknown=0, NotChecked=0, Total=25760 [2021-11-21 00:28:16,825 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand has 154 states, 153 states have (on average 2.9019607843137254) internal successors, (444), 153 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:19,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:19,353 INFO L93 Difference]: Finished difference Result 156 states and 157 transitions. [2021-11-21 00:28:19,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-21 00:28:19,354 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 153 states have (on average 2.9019607843137254) internal successors, (444), 153 states have internal predecessors, (444), 0 states have call successors, (0), 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 148 [2021-11-21 00:28:19,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:19,355 INFO L225 Difference]: With dead ends: 156 [2021-11-21 00:28:19,355 INFO L226 Difference]: Without dead ends: 156 [2021-11-21 00:28:19,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12053 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=6241, Invalid=28915, Unknown=0, NotChecked=0, Total=35156 [2021-11-21 00:28:19,357 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 707 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 2541 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 707 SdHoareTripleChecker+Valid, 507 SdHoareTripleChecker+Invalid, 2726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 2541 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:19,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [707 Valid, 507 Invalid, 2726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 2541 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 00:28:19,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-21 00:28:19,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 153. [2021-11-21 00:28:19,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.013157894736842) internal successors, (154), 152 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:19,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 154 transitions. [2021-11-21 00:28:19,361 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 154 transitions. Word has length 148 [2021-11-21 00:28:19,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:19,361 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 154 transitions. [2021-11-21 00:28:19,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 153 states have (on average 2.9019607843137254) internal successors, (444), 153 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:19,362 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 154 transitions. [2021-11-21 00:28:19,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-21 00:28:19,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:19,363 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 1, 1, 1, 1] [2021-11-21 00:28:19,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:19,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:19,567 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:28:19,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:19,567 INFO L85 PathProgramCache]: Analyzing trace with hash 2082013149, now seen corresponding path program 48 times [2021-11-21 00:28:19,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:19,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337559350] [2021-11-21 00:28:19,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:19,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:19,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:21,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1801 backedges. 73 proven. 1728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:21,194 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:21,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337559350] [2021-11-21 00:28:21,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337559350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:21,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482322527] [2021-11-21 00:28:21,194 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:28:21,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:21,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:21,195 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:21,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-21 00:28:21,608 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:28:21,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:21,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 788 conjuncts, 162 conjunts are in the unsatisfiable core [2021-11-21 00:28:21,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:22,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:28:23,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1801 backedges. 73 proven. 1728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:23,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:23,611 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 [2021-11-21 00:28:23,613 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 [2021-11-21 00:28:23,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1801 backedges. 73 proven. 1728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:23,972 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482322527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:23,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1039506495] [2021-11-21 00:28:23,973 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:28:23,973 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:23,974 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:23,974 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:23,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:23,987 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 6 treesize of output 5 [2021-11-21 00:28:24,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:28:24,295 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:28:24,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:28:24,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:24,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:28:26,688 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:27,883 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:27,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:27,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 85 [2021-11-21 00:28:27,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793845872] [2021-11-21 00:28:27,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:27,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-21 00:28:27,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:27,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-21 00:28:27,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=8317, Unknown=0, NotChecked=0, Total=8556 [2021-11-21 00:28:27,886 INFO L87 Difference]: Start difference. First operand 153 states and 154 transitions. Second operand has 86 states, 86 states have (on average 2.5) internal successors, (215), 85 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:33,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:33,559 INFO L93 Difference]: Finished difference Result 255 states and 256 transitions. [2021-11-21 00:28:33,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2021-11-21 00:28:33,559 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 2.5) internal successors, (215), 85 states have internal predecessors, (215), 0 states have call successors, (0), 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 152 [2021-11-21 00:28:33,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:33,560 INFO L225 Difference]: With dead ends: 255 [2021-11-21 00:28:33,560 INFO L226 Difference]: Without dead ends: 156 [2021-11-21 00:28:33,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 414 SyntacticMatches, 3 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2455 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=636, Invalid=19956, Unknown=0, NotChecked=0, Total=20592 [2021-11-21 00:28:33,562 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 153 mSDsluCounter, 1624 mSDsCounter, 0 mSdLazyCounter, 8339 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 1614 SdHoareTripleChecker+Invalid, 8540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 8339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:33,562 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 1614 Invalid, 8540 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 8339 Invalid, 0 Unknown, 127 Unchecked, 3.1s Time] [2021-11-21 00:28:33,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-21 00:28:33,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2021-11-21 00:28:33,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0129870129870129) internal successors, (156), 154 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) [2021-11-21 00:28:33,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 156 transitions. [2021-11-21 00:28:33,564 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 156 transitions. Word has length 152 [2021-11-21 00:28:33,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:33,564 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 156 transitions. [2021-11-21 00:28:33,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 2.5) internal successors, (215), 85 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:33,564 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 156 transitions. [2021-11-21 00:28:33,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-21 00:28:33,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:33,565 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 25, 1, 1, 1, 1] [2021-11-21 00:28:33,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:33,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-21 00:28:33,766 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:28:33,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:33,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1444145250, now seen corresponding path program 49 times [2021-11-21 00:28:33,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:33,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792097818] [2021-11-21 00:28:33,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:33,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:33,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:35,501 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 576 proven. 1274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:35,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:35,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792097818] [2021-11-21 00:28:35,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792097818] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:35,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126935354] [2021-11-21 00:28:35,502 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:28:35,502 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:35,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:35,503 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:35,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-21 00:28:35,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:35,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 137 conjunts are in the unsatisfiable core [2021-11-21 00:28:35,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:37,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 576 proven. 1274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:37,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:39,031 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 [2021-11-21 00:28:39,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1850 backedges. 576 proven. 1274 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:39,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126935354] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:39,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1354176892] [2021-11-21 00:28:39,180 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:28:39,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:39,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:39,181 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:39,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:39,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-21 00:28:39,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:39,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:28:39,494 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 136 treesize of output 128 [2021-11-21 00:28:39,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:39,745 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 14 treesize of output 10 [2021-11-21 00:28:41,904 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:43,024 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:43,024 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:43,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 53, 53] total 107 [2021-11-21 00:28:43,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103536919] [2021-11-21 00:28:43,025 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:43,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-21 00:28:43,025 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:43,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-21 00:28:43,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=11783, Unknown=0, NotChecked=0, Total=13340 [2021-11-21 00:28:43,027 INFO L87 Difference]: Start difference. First operand 155 states and 156 transitions. Second operand has 109 states, 108 states have (on average 2.8981481481481484) internal successors, (313), 108 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:45,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:28:45,777 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2021-11-21 00:28:45,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-21 00:28:45,777 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 108 states have (on average 2.8981481481481484) internal successors, (313), 108 states have internal predecessors, (313), 0 states have call successors, (0), 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 154 [2021-11-21 00:28:45,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:28:45,778 INFO L225 Difference]: With dead ends: 162 [2021-11-21 00:28:45,778 INFO L226 Difference]: Without dead ends: 162 [2021-11-21 00:28:45,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 396 SyntacticMatches, 2 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5878 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=3503, Invalid=17089, Unknown=0, NotChecked=0, Total=20592 [2021-11-21 00:28:45,779 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 673 mSDsluCounter, 690 mSDsCounter, 0 mSdLazyCounter, 4061 mSolverCounterSat, 207 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 673 SdHoareTripleChecker+Valid, 716 SdHoareTripleChecker+Invalid, 4268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 207 IncrementalHoareTripleChecker+Valid, 4061 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:28:45,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [673 Valid, 716 Invalid, 4268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [207 Valid, 4061 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-21 00:28:45,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-21 00:28:45,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 159. [2021-11-21 00:28:45,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:45,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2021-11-21 00:28:45,783 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2021-11-21 00:28:45,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:28:45,783 INFO L470 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2021-11-21 00:28:45,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 108 states have (on average 2.8981481481481484) internal successors, (313), 108 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:28:45,784 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2021-11-21 00:28:45,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-21 00:28:45,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:28:45,785 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 1, 1, 1, 1] [2021-11-21 00:28:45,810 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-21 00:28:45,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-21 00:28:45,995 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:28:45,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:28:45,995 INFO L85 PathProgramCache]: Analyzing trace with hash -514591465, now seen corresponding path program 50 times [2021-11-21 00:28:45,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:28:45,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639872393] [2021-11-21 00:28:45,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:28:45,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:28:46,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:28:48,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1951 backedges. 76 proven. 1875 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:48,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:28:48,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639872393] [2021-11-21 00:28:48,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639872393] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:28:48,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120313467] [2021-11-21 00:28:48,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:28:48,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:28:48,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:28:48,032 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:28:48,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-21 00:28:52,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-21 00:28:52,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:28:52,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 168 conjunts are in the unsatisfiable core [2021-11-21 00:28:52,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:28:53,762 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 21 treesize of output 17 [2021-11-21 00:28:54,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1951 backedges. 76 proven. 1875 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:54,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:28:54,439 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 [2021-11-21 00:28:54,440 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 [2021-11-21 00:28:54,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1951 backedges. 76 proven. 1875 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:28:54,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120313467] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:28:54,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [495685525] [2021-11-21 00:28:54,798 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:28:54,798 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:28:54,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:28:54,799 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:28:54,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:28:54,832 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 6 treesize of output 5 [2021-11-21 00:28:54,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:55,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:28:55,089 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 136 treesize of output 128 [2021-11-21 00:28:55,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:28:55,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:28:57,516 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:28:58,786 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:28:58,786 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:28:58,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 88 [2021-11-21 00:28:58,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747462597] [2021-11-21 00:28:58,787 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:28:58,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-21 00:28:58,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:28:58,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-21 00:28:58,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=8874, Unknown=0, NotChecked=0, Total=9120 [2021-11-21 00:28:58,788 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand has 89 states, 89 states have (on average 2.50561797752809) internal successors, (223), 88 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:04,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:04,624 INFO L93 Difference]: Finished difference Result 265 states and 266 transitions. [2021-11-21 00:29:04,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-21 00:29:04,624 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 2.50561797752809) internal successors, (223), 88 states have internal predecessors, (223), 0 states have call successors, (0), 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 158 [2021-11-21 00:29:04,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:04,625 INFO L225 Difference]: With dead ends: 265 [2021-11-21 00:29:04,625 INFO L226 Difference]: Without dead ends: 162 [2021-11-21 00:29:04,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2614 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=658, Invalid=21394, Unknown=0, NotChecked=0, Total=22052 [2021-11-21 00:29:04,627 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 237 mSDsluCounter, 1657 mSDsCounter, 0 mSdLazyCounter, 8489 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 237 SdHoareTripleChecker+Valid, 1649 SdHoareTripleChecker+Invalid, 8668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 8489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:04,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [237 Valid, 1649 Invalid, 8668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 8489 Invalid, 0 Unknown, 76 Unchecked, 3.1s Time] [2021-11-21 00:29:04,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-21 00:29:04,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2021-11-21 00:29:04,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.0125) internal successors, (162), 160 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:04,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 162 transitions. [2021-11-21 00:29:04,629 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 162 transitions. Word has length 158 [2021-11-21 00:29:04,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:04,630 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 162 transitions. [2021-11-21 00:29:04,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 2.50561797752809) internal successors, (223), 88 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:04,630 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 162 transitions. [2021-11-21 00:29:04,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2021-11-21 00:29:04,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:04,631 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 26, 1, 1, 1, 1] [2021-11-21 00:29:04,665 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-21 00:29:04,855 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-21 00:29:04,855 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:29:04,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:04,855 INFO L85 PathProgramCache]: Analyzing trace with hash -115497508, now seen corresponding path program 51 times [2021-11-21 00:29:04,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:04,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892423154] [2021-11-21 00:29:04,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:04,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:04,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:06,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 625 proven. 1377 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:06,569 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:06,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892423154] [2021-11-21 00:29:06,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892423154] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:06,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285536838] [2021-11-21 00:29:06,569 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:29:06,570 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:06,570 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:06,570 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:06,571 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-21 00:29:07,605 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:29:07,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:07,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 828 conjuncts, 147 conjunts are in the unsatisfiable core [2021-11-21 00:29:07,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:07,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:09,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 625 proven. 1377 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:09,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:14,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 676 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:14,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285536838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:14,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1347095862] [2021-11-21 00:29:14,181 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:29:14,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:14,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:14,182 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:14,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:14,208 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 6 treesize of output 5 [2021-11-21 00:29:14,286 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 20 treesize of output 16 [2021-11-21 00:29:14,490 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:29:14,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:29:14,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:29:14,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:29:16,865 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:18,263 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:18,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:18,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 135 [2021-11-21 00:29:18,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789494246] [2021-11-21 00:29:18,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:18,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2021-11-21 00:29:18,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:18,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2021-11-21 00:29:18,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2158, Invalid=18434, Unknown=0, NotChecked=0, Total=20592 [2021-11-21 00:29:18,266 INFO L87 Difference]: Start difference. First operand 161 states and 162 transitions. Second operand has 137 states, 136 states have (on average 3.1323529411764706) internal successors, (426), 136 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:21,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:21,366 INFO L93 Difference]: Finished difference Result 168 states and 169 transitions. [2021-11-21 00:29:21,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2021-11-21 00:29:21,366 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 136 states have (on average 3.1323529411764706) internal successors, (426), 136 states have internal predecessors, (426), 0 states have call successors, (0), 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 160 [2021-11-21 00:29:21,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:21,367 INFO L225 Difference]: With dead ends: 168 [2021-11-21 00:29:21,367 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:29:21,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 389 SyntacticMatches, 1 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8315 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=4298, Invalid=25458, Unknown=0, NotChecked=0, Total=29756 [2021-11-21 00:29:21,369 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 610 mSDsluCounter, 979 mSDsCounter, 0 mSdLazyCounter, 4987 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 610 SdHoareTripleChecker+Valid, 1006 SdHoareTripleChecker+Invalid, 5183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 4987 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:21,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [610 Valid, 1006 Invalid, 5183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 4987 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-21 00:29:21,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:29:21,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 165. [2021-11-21 00:29:21,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0121951219512195) internal successors, (166), 164 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:21,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2021-11-21 00:29:21,373 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 160 [2021-11-21 00:29:21,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:21,373 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2021-11-21 00:29:21,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 136 states have (on average 3.1323529411764706) internal successors, (426), 136 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:21,374 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2021-11-21 00:29:21,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-21 00:29:21,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:21,375 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 1, 1, 1, 1] [2021-11-21 00:29:21,407 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:21,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:21,591 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:29:21,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:21,591 INFO L85 PathProgramCache]: Analyzing trace with hash 1173251473, now seen corresponding path program 52 times [2021-11-21 00:29:21,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:21,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104837806] [2021-11-21 00:29:21,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:21,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:21,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:23,490 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 79 proven. 2028 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:23,491 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:23,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104837806] [2021-11-21 00:29:23,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104837806] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:23,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182068034] [2021-11-21 00:29:23,491 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:29:23,491 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:23,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:23,493 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:23,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-21 00:29:23,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:23,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 848 conjuncts, 174 conjunts are in the unsatisfiable core [2021-11-21 00:29:23,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:25,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:29:25,646 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 79 proven. 2028 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:25,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:26,023 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 [2021-11-21 00:29:26,025 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 [2021-11-21 00:29:26,405 INFO L134 CoverageAnalysis]: Checked inductivity of 2107 backedges. 79 proven. 2028 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:26,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182068034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:26,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501096673] [2021-11-21 00:29:26,407 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:29:26,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:26,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:26,408 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:26,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:26,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-21 00:29:26,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:29:26,714 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:29:26,714 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 136 treesize of output 128 [2021-11-21 00:29:26,881 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 23 treesize of output 19 [2021-11-21 00:29:26,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:29:29,104 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:30,382 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:30,382 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:30,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 91 [2021-11-21 00:29:30,383 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733561601] [2021-11-21 00:29:30,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:30,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-21 00:29:30,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:30,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-21 00:29:30,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=9449, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 00:29:30,384 INFO L87 Difference]: Start difference. First operand 165 states and 166 transitions. Second operand has 92 states, 92 states have (on average 2.510869565217391) internal successors, (231), 91 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:36,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:36,474 INFO L93 Difference]: Finished difference Result 275 states and 276 transitions. [2021-11-21 00:29:36,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-21 00:29:36,474 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 2.510869565217391) internal successors, (231), 91 states have internal predecessors, (231), 0 states have call successors, (0), 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 164 [2021-11-21 00:29:36,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:36,475 INFO L225 Difference]: With dead ends: 275 [2021-11-21 00:29:36,475 INFO L226 Difference]: Without dead ends: 168 [2021-11-21 00:29:36,477 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 448 SyntacticMatches, 3 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2778 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=680, Invalid=22882, Unknown=0, NotChecked=0, Total=23562 [2021-11-21 00:29:36,478 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 165 mSDsluCounter, 1752 mSDsCounter, 0 mSdLazyCounter, 9015 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 1742 SdHoareTripleChecker+Invalid, 9172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 9015 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:36,478 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 1742 Invalid, 9172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 9015 Invalid, 0 Unknown, 77 Unchecked, 3.2s Time] [2021-11-21 00:29:36,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-21 00:29:36,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2021-11-21 00:29:36,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0120481927710843) internal successors, (168), 166 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) [2021-11-21 00:29:36,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2021-11-21 00:29:36,491 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 164 [2021-11-21 00:29:36,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:36,492 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2021-11-21 00:29:36,492 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 2.510869565217391) internal successors, (231), 91 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:36,492 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2021-11-21 00:29:36,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-21 00:29:36,493 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:36,493 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 27, 1, 1, 1, 1] [2021-11-21 00:29:36,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:36,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-21 00:29:36,699 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:29:36,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:36,701 INFO L85 PathProgramCache]: Analyzing trace with hash -1595953514, now seen corresponding path program 53 times [2021-11-21 00:29:36,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:36,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888157148] [2021-11-21 00:29:36,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:36,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:36,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:38,425 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 676 proven. 1484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:38,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:38,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888157148] [2021-11-21 00:29:38,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888157148] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:38,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859578141] [2021-11-21 00:29:38,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:29:38,426 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:38,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:38,427 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:38,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-21 00:29:42,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-11-21 00:29:42,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:42,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 858 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-21 00:29:42,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:29:42,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:29:46,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 676 proven. 1484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:46,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:29:50,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2160 backedges. 729 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:50,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859578141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:29:50,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [509270448] [2021-11-21 00:29:50,800 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:29:50,800 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:29:50,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:29:50,800 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:29:50,800 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:29:50,826 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 6 treesize of output 5 [2021-11-21 00:29:50,896 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 20 treesize of output 16 [2021-11-21 00:29:51,081 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:29:51,081 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 136 treesize of output 135 [2021-11-21 00:29:51,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:29:51,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:29:53,263 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:29:54,524 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:29:54,524 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:29:54,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 57, 57] total 170 [2021-11-21 00:29:54,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288697886] [2021-11-21 00:29:54,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:29:54,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2021-11-21 00:29:54,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:29:54,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-11-21 00:29:54,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4210, Invalid=27652, Unknown=0, NotChecked=0, Total=31862 [2021-11-21 00:29:54,527 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand has 172 states, 171 states have (on average 2.912280701754386) internal successors, (498), 171 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:57,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:29:57,325 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2021-11-21 00:29:57,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-21 00:29:57,326 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 171 states have (on average 2.912280701754386) internal successors, (498), 171 states have internal predecessors, (498), 0 states have call successors, (0), 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 166 [2021-11-21 00:29:57,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:29:57,326 INFO L225 Difference]: With dead ends: 174 [2021-11-21 00:29:57,326 INFO L226 Difference]: Without dead ends: 174 [2021-11-21 00:29:57,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14972 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=7741, Invalid=35731, Unknown=0, NotChecked=0, Total=43472 [2021-11-21 00:29:57,328 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 1366 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 2621 mSolverCounterSat, 408 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1366 SdHoareTripleChecker+Valid, 610 SdHoareTripleChecker+Invalid, 3029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 408 IncrementalHoareTripleChecker+Valid, 2621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:29:57,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1366 Valid, 610 Invalid, 3029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [408 Valid, 2621 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-21 00:29:57,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-21 00:29:57,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 171. [2021-11-21 00:29:57,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.011764705882353) internal successors, (172), 170 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:57,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2021-11-21 00:29:57,331 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 166 [2021-11-21 00:29:57,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:29:57,331 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2021-11-21 00:29:57,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 171 states have (on average 2.912280701754386) internal successors, (498), 171 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:29:57,331 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2021-11-21 00:29:57,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-21 00:29:57,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:29:57,332 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 1, 1, 1, 1] [2021-11-21 00:29:57,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-21 00:29:57,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:57,532 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:29:57,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:29:57,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1213628085, now seen corresponding path program 54 times [2021-11-21 00:29:57,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:29:57,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459178760] [2021-11-21 00:29:57,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:29:57,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:29:57,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:29:59,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 82 proven. 2187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:29:59,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:29:59,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459178760] [2021-11-21 00:29:59,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459178760] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:29:59,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048761884] [2021-11-21 00:29:59,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:29:59,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:29:59,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:29:59,378 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:29:59,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-21 00:29:59,829 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:29:59,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:29:59,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 878 conjuncts, 180 conjunts are in the unsatisfiable core [2021-11-21 00:29:59,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:01,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:30:01,819 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 82 proven. 2187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:01,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:02,126 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 [2021-11-21 00:30:02,127 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 [2021-11-21 00:30:02,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2269 backedges. 82 proven. 2187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:02,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048761884] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:02,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1850357908] [2021-11-21 00:30:02,527 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:30:02,527 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:02,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:02,527 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:02,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:02,564 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 6 treesize of output 5 [2021-11-21 00:30:02,647 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 20 treesize of output 16 [2021-11-21 00:30:02,822 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:30:02,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:30:03,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:30:03,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:30:05,035 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:06,298 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:06,299 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:06,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 94 [2021-11-21 00:30:06,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834972951] [2021-11-21 00:30:06,299 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:06,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-21 00:30:06,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:06,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-21 00:30:06,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=10042, Unknown=0, NotChecked=0, Total=10302 [2021-11-21 00:30:06,300 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand has 95 states, 95 states have (on average 2.5157894736842104) internal successors, (239), 94 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:12,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:12,934 INFO L93 Difference]: Finished difference Result 285 states and 286 transitions. [2021-11-21 00:30:12,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2021-11-21 00:30:12,934 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 2.5157894736842104) internal successors, (239), 94 states have internal predecessors, (239), 0 states have call successors, (0), 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 170 [2021-11-21 00:30:12,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:12,935 INFO L225 Difference]: With dead ends: 285 [2021-11-21 00:30:12,935 INFO L226 Difference]: Without dead ends: 174 [2021-11-21 00:30:12,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 625 GetRequests, 465 SyntacticMatches, 3 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2947 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=702, Invalid=24420, Unknown=0, NotChecked=0, Total=25122 [2021-11-21 00:30:12,937 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 170 mSDsluCounter, 1955 mSDsCounter, 0 mSdLazyCounter, 10153 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 1946 SdHoareTripleChecker+Invalid, 10236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 10153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:12,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 1946 Invalid, 10236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 10153 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-11-21 00:30:12,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-11-21 00:30:12,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2021-11-21 00:30:12,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0116279069767442) internal successors, (174), 172 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:12,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 174 transitions. [2021-11-21 00:30:12,940 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 174 transitions. Word has length 170 [2021-11-21 00:30:12,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:12,941 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 174 transitions. [2021-11-21 00:30:12,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 2.5157894736842104) internal successors, (239), 94 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:12,941 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 174 transitions. [2021-11-21 00:30:12,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-21 00:30:12,943 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:12,943 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 28, 1, 1, 1, 1] [2021-11-21 00:30:12,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:13,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:13,167 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:30:13,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:13,167 INFO L85 PathProgramCache]: Analyzing trace with hash 155136656, now seen corresponding path program 55 times [2021-11-21 00:30:13,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:13,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057526379] [2021-11-21 00:30:13,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:13,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:13,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:15,189 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 729 proven. 1595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:15,190 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:15,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057526379] [2021-11-21 00:30:15,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057526379] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:15,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771131423] [2021-11-21 00:30:15,190 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:30:15,190 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:15,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:15,191 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:15,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-21 00:30:15,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:15,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 888 conjuncts, 152 conjunts are in the unsatisfiable core [2021-11-21 00:30:15,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:17,086 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 729 proven. 1595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:17,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:19,202 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 [2021-11-21 00:30:19,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 729 proven. 1595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:19,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771131423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:19,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [908484560] [2021-11-21 00:30:19,350 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:30:19,351 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:19,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:19,351 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:19,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:19,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:30:19,464 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 20 treesize of output 16 [2021-11-21 00:30:19,658 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:30:19,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:30:19,904 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 23 treesize of output 19 [2021-11-21 00:30:19,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:30:22,056 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:23,149 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:23,149 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:23,150 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 59, 59] total 119 [2021-11-21 00:30:23,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935822108] [2021-11-21 00:30:23,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:23,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-21 00:30:23,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:23,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-21 00:30:23,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1905, Invalid=14351, Unknown=0, NotChecked=0, Total=16256 [2021-11-21 00:30:23,152 INFO L87 Difference]: Start difference. First operand 173 states and 174 transitions. Second operand has 121 states, 120 states have (on average 2.908333333333333) internal successors, (349), 120 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:26,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:26,354 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2021-11-21 00:30:26,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2021-11-21 00:30:26,354 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 120 states have (on average 2.908333333333333) internal successors, (349), 120 states have internal predecessors, (349), 0 states have call successors, (0), 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 172 [2021-11-21 00:30:26,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:26,355 INFO L225 Difference]: With dead ends: 180 [2021-11-21 00:30:26,355 INFO L226 Difference]: Without dead ends: 180 [2021-11-21 00:30:26,356 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 444 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7165 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=4292, Invalid=20830, Unknown=0, NotChecked=0, Total=25122 [2021-11-21 00:30:26,357 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 281 mSDsluCounter, 877 mSDsCounter, 0 mSdLazyCounter, 5087 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 906 SdHoareTripleChecker+Invalid, 5158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 5087 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:26,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 906 Invalid, 5158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 5087 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-21 00:30:26,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-21 00:30:26,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 177. [2021-11-21 00:30:26,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 176 states have (on average 1.0113636363636365) internal successors, (178), 176 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:26,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2021-11-21 00:30:26,360 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 172 [2021-11-21 00:30:26,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:26,360 INFO L470 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2021-11-21 00:30:26,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 120 states have (on average 2.908333333333333) internal successors, (349), 120 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:26,361 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2021-11-21 00:30:26,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-21 00:30:26,362 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:26,362 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 1, 1, 1, 1] [2021-11-21 00:30:26,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:26,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-11-21 00:30:26,567 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:30:26,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:26,567 INFO L85 PathProgramCache]: Analyzing trace with hash 475166789, now seen corresponding path program 56 times [2021-11-21 00:30:26,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:26,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722163233] [2021-11-21 00:30:26,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:26,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:26,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:28,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2437 backedges. 85 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:28,705 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:28,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722163233] [2021-11-21 00:30:28,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1722163233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:28,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345928145] [2021-11-21 00:30:28,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:30:28,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:28,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:28,706 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:28,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-21 00:30:36,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-21 00:30:36,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:30:36,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 186 conjunts are in the unsatisfiable core [2021-11-21 00:30:36,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:37,931 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 21 treesize of output 17 [2021-11-21 00:30:38,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2437 backedges. 85 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:38,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:30:38,644 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 [2021-11-21 00:30:38,645 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 [2021-11-21 00:30:39,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2437 backedges. 85 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:39,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345928145] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:30:39,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [800766603] [2021-11-21 00:30:39,043 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:30:39,043 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:30:39,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:30:39,043 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:30:39,043 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:30:39,067 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 6 treesize of output 5 [2021-11-21 00:30:39,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:30:39,307 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:30:39,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:30:39,533 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 23 treesize of output 19 [2021-11-21 00:30:39,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:30:41,748 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:30:43,022 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:30:43,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:30:43,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 97 [2021-11-21 00:30:43,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453311789] [2021-11-21 00:30:43,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:30:43,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-21 00:30:43,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:30:43,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-21 00:30:43,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=10653, Unknown=0, NotChecked=0, Total=10920 [2021-11-21 00:30:43,025 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand has 98 states, 98 states have (on average 2.520408163265306) internal successors, (247), 97 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:49,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:30:49,982 INFO L93 Difference]: Finished difference Result 295 states and 296 transitions. [2021-11-21 00:30:49,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2021-11-21 00:30:49,983 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 2.520408163265306) internal successors, (247), 97 states have internal predecessors, (247), 0 states have call successors, (0), 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 176 [2021-11-21 00:30:49,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:30:49,984 INFO L225 Difference]: With dead ends: 295 [2021-11-21 00:30:49,984 INFO L226 Difference]: Without dead ends: 180 [2021-11-21 00:30:49,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 647 GetRequests, 482 SyntacticMatches, 3 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3121 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=724, Invalid=26008, Unknown=0, NotChecked=0, Total=26732 [2021-11-21 00:30:49,987 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 263 mSDsluCounter, 1984 mSDsCounter, 0 mSdLazyCounter, 10227 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 1979 SdHoareTripleChecker+Invalid, 10342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 10227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:30:49,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 1979 Invalid, 10342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 10227 Invalid, 0 Unknown, 0 Unchecked, 3.7s Time] [2021-11-21 00:30:49,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-11-21 00:30:49,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2021-11-21 00:30:49,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0112359550561798) internal successors, (180), 178 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:49,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2021-11-21 00:30:49,990 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 176 [2021-11-21 00:30:49,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:30:49,991 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2021-11-21 00:30:49,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 2.520408163265306) internal successors, (247), 97 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:30:49,991 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2021-11-21 00:30:49,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-21 00:30:49,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:30:49,992 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 29, 1, 1, 1, 1] [2021-11-21 00:30:50,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-21 00:30:50,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-21 00:30:50,207 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:30:50,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:30:50,207 INFO L85 PathProgramCache]: Analyzing trace with hash -1691524662, now seen corresponding path program 57 times [2021-11-21 00:30:50,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:30:50,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996326665] [2021-11-21 00:30:50,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:30:50,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:30:50,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:30:52,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 784 proven. 1710 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:52,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:30:52,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996326665] [2021-11-21 00:30:52,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996326665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:30:52,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328486277] [2021-11-21 00:30:52,173 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:30:52,173 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:30:52,173 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:30:52,174 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:30:52,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-21 00:30:53,008 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:30:53,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:30:53,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 918 conjuncts, 162 conjunts are in the unsatisfiable core [2021-11-21 00:30:53,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:30:53,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:30:55,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 784 proven. 1710 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:30:55,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:31:00,608 INFO L134 CoverageAnalysis]: Checked inductivity of 2494 backedges. 841 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:00,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328486277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:31:00,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084974890] [2021-11-21 00:31:00,609 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:31:00,609 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:31:00,609 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:31:00,609 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:31:00,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:31:00,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:31:00,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:31:00,916 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:31:00,917 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 136 treesize of output 135 [2021-11-21 00:31:01,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:31:01,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:31:03,229 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:31:04,708 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:31:04,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:31:04,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 150 [2021-11-21 00:31:04,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495703954] [2021-11-21 00:31:04,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:31:04,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-21 00:31:04,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:04,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-21 00:31:04,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2620, Invalid=22502, Unknown=0, NotChecked=0, Total=25122 [2021-11-21 00:31:04,712 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand has 152 states, 151 states have (on average 3.1390728476821192) internal successors, (474), 151 states have internal predecessors, (474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:08,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:08,886 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2021-11-21 00:31:08,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-21 00:31:08,886 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 151 states have (on average 3.1390728476821192) internal successors, (474), 151 states have internal predecessors, (474), 0 states have call successors, (0), 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 178 [2021-11-21 00:31:08,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:08,888 INFO L225 Difference]: With dead ends: 186 [2021-11-21 00:31:08,888 INFO L226 Difference]: Without dead ends: 186 [2021-11-21 00:31:08,890 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 624 GetRequests, 434 SyntacticMatches, 1 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10184 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=5222, Invalid=31068, Unknown=0, NotChecked=0, Total=36290 [2021-11-21 00:31:08,891 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 666 mSDsluCounter, 1433 mSDsCounter, 0 mSdLazyCounter, 7558 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 666 SdHoareTripleChecker+Valid, 1463 SdHoareTripleChecker+Invalid, 7776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 7558 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:08,891 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [666 Valid, 1463 Invalid, 7776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 7558 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-11-21 00:31:08,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-11-21 00:31:08,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 183. [2021-11-21 00:31:08,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.010989010989011) internal successors, (184), 182 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:08,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2021-11-21 00:31:08,895 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 178 [2021-11-21 00:31:08,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:08,896 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2021-11-21 00:31:08,896 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 151 states have (on average 3.1390728476821192) internal successors, (474), 151 states have internal predecessors, (474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:08,896 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2021-11-21 00:31:08,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-21 00:31:08,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:08,898 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 1, 1, 1, 1] [2021-11-21 00:31:08,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-21 00:31:09,118 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:09,119 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:31:09,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:09,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1597867393, now seen corresponding path program 58 times [2021-11-21 00:31:09,119 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:09,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928118505] [2021-11-21 00:31:09,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:09,119 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:09,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:11,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2611 backedges. 88 proven. 2523 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:11,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:11,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928118505] [2021-11-21 00:31:11,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928118505] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:31:11,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995331558] [2021-11-21 00:31:11,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:31:11,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:11,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:11,242 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:31:11,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-21 00:31:11,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:11,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 938 conjuncts, 192 conjunts are in the unsatisfiable core [2021-11-21 00:31:11,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:31:13,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:31:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2611 backedges. 88 proven. 2523 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:13,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:31:14,106 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 13 [2021-11-21 00:31:14,108 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 [2021-11-21 00:31:14,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2611 backedges. 88 proven. 2523 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:14,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995331558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:31:14,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1868982535] [2021-11-21 00:31:14,492 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:31:14,492 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:31:14,492 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:31:14,492 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:31:14,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:31:14,517 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 6 treesize of output 5 [2021-11-21 00:31:14,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 00:31:14,796 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:31:14,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:31:15,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:31:15,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:31:17,306 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:31:18,631 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:31:18,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:31:18,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 100 [2021-11-21 00:31:18,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377883201] [2021-11-21 00:31:18,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:31:18,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-21 00:31:18,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:18,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-21 00:31:18,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=11282, Unknown=0, NotChecked=0, Total=11556 [2021-11-21 00:31:18,633 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand has 101 states, 101 states have (on average 2.5247524752475248) internal successors, (255), 100 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:26,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:26,171 INFO L93 Difference]: Finished difference Result 305 states and 306 transitions. [2021-11-21 00:31:26,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-21 00:31:26,171 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.5247524752475248) internal successors, (255), 100 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 182 [2021-11-21 00:31:26,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:26,172 INFO L225 Difference]: With dead ends: 305 [2021-11-21 00:31:26,172 INFO L226 Difference]: Without dead ends: 186 [2021-11-21 00:31:26,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 669 GetRequests, 499 SyntacticMatches, 3 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3300 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=746, Invalid=27646, Unknown=0, NotChecked=0, Total=28392 [2021-11-21 00:31:26,173 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 452 mSDsluCounter, 2203 mSDsCounter, 0 mSdLazyCounter, 11207 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 452 SdHoareTripleChecker+Valid, 2198 SdHoareTripleChecker+Invalid, 11525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 11207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:26,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [452 Valid, 2198 Invalid, 11525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 11207 Invalid, 0 Unknown, 140 Unchecked, 4.1s Time] [2021-11-21 00:31:26,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-11-21 00:31:26,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2021-11-21 00:31:26,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 184 states have (on average 1.0108695652173914) internal successors, (186), 184 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) [2021-11-21 00:31:26,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 186 transitions. [2021-11-21 00:31:26,177 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 186 transitions. Word has length 182 [2021-11-21 00:31:26,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:26,177 INFO L470 AbstractCegarLoop]: Abstraction has 185 states and 186 transitions. [2021-11-21 00:31:26,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.5247524752475248) internal successors, (255), 100 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:26,178 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 186 transitions. [2021-11-21 00:31:26,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-21 00:31:26,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:26,179 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 30, 1, 1, 1, 1] [2021-11-21 00:31:26,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-21 00:31:26,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:26,387 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:31:26,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:26,387 INFO L85 PathProgramCache]: Analyzing trace with hash 463957060, now seen corresponding path program 59 times [2021-11-21 00:31:26,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:26,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832991463] [2021-11-21 00:31:26,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:26,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:26,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:28,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 841 proven. 1829 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:28,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:28,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832991463] [2021-11-21 00:31:28,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832991463] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:31:28,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49908575] [2021-11-21 00:31:28,273 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:31:28,273 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:28,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:28,274 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:31:28,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-21 00:31:34,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2021-11-21 00:31:34,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:31:34,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 948 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-21 00:31:34,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:31:34,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-21 00:31:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 841 proven. 1829 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:39,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:31:44,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 900 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:44,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49908575] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:31:44,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [498561499] [2021-11-21 00:31:44,891 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:31:44,891 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:31:44,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:31:44,891 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:31:44,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:31:44,920 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 6 treesize of output 5 [2021-11-21 00:31:44,997 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 20 treesize of output 16 [2021-11-21 00:31:45,184 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:31:45,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:31:45,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:31:45,551 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 [2021-11-21 00:31:47,507 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:31:48,852 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:31:48,852 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:31:48,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 63, 63] total 188 [2021-11-21 00:31:48,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180540228] [2021-11-21 00:31:48,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:31:48,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2021-11-21 00:31:48,853 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:48,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2021-11-21 00:31:48,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5122, Invalid=33490, Unknown=0, NotChecked=0, Total=38612 [2021-11-21 00:31:48,856 INFO L87 Difference]: Start difference. First operand 185 states and 186 transitions. Second operand has 190 states, 189 states have (on average 2.9206349206349205) internal successors, (552), 189 states have internal predecessors, (552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:52,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:52,220 INFO L93 Difference]: Finished difference Result 192 states and 193 transitions. [2021-11-21 00:31:52,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-21 00:31:52,221 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 189 states have (on average 2.9206349206349205) internal successors, (552), 189 states have internal predecessors, (552), 0 states have call successors, (0), 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 184 [2021-11-21 00:31:52,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:52,223 INFO L225 Difference]: With dead ends: 192 [2021-11-21 00:31:52,223 INFO L226 Difference]: Without dead ends: 192 [2021-11-21 00:31:52,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 417 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18206 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=9403, Invalid=43267, Unknown=0, NotChecked=0, Total=52670 [2021-11-21 00:31:52,228 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 911 mSDsluCounter, 660 mSDsCounter, 0 mSdLazyCounter, 3276 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 911 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 3536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 3276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:52,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [911 Valid, 691 Invalid, 3536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 3276 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-21 00:31:52,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-21 00:31:52,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 189. [2021-11-21 00:31:52,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0106382978723405) internal successors, (190), 188 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:52,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2021-11-21 00:31:52,232 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2021-11-21 00:31:52,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:52,232 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2021-11-21 00:31:52,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 189 states have (on average 2.9206349206349205) internal successors, (552), 189 states have internal predecessors, (552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:31:52,233 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2021-11-21 00:31:52,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-21 00:31:52,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:52,234 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 1, 1, 1, 1] [2021-11-21 00:31:52,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-21 00:31:52,448 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:52,448 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:31:52,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:52,448 INFO L85 PathProgramCache]: Analyzing trace with hash -404834311, now seen corresponding path program 60 times [2021-11-21 00:31:52,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:52,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770057013] [2021-11-21 00:31:52,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:52,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:52,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:54,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2791 backedges. 91 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:54,846 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:54,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770057013] [2021-11-21 00:31:54,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770057013] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:31:54,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139784586] [2021-11-21 00:31:54,847 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:31:54,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:31:54,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:54,850 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:31:54,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-21 00:31:55,400 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:31:55,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:31:55,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 968 conjuncts, 198 conjunts are in the unsatisfiable core [2021-11-21 00:31:55,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:31:57,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:31:57,813 INFO L134 CoverageAnalysis]: Checked inductivity of 2791 backedges. 91 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:57,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:31:58,154 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 [2021-11-21 00:31:58,155 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 [2021-11-21 00:31:58,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2791 backedges. 91 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:58,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139784586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:31:58,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004266302] [2021-11-21 00:31:58,616 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:31:58,616 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:31:58,617 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:31:58,617 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:31:58,617 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:31:58,645 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 6 treesize of output 5 [2021-11-21 00:31:58,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:31:58,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:31:58,930 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 136 treesize of output 128 [2021-11-21 00:31:59,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:31:59,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:32:01,140 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:32:02,502 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:32:02,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:32:02,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 103 [2021-11-21 00:32:02,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790017014] [2021-11-21 00:32:02,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:32:02,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-21 00:32:02,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:02,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-21 00:32:02,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=11929, Unknown=0, NotChecked=0, Total=12210 [2021-11-21 00:32:02,505 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand has 104 states, 104 states have (on average 2.5288461538461537) internal successors, (263), 103 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:10,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:10,758 INFO L93 Difference]: Finished difference Result 315 states and 316 transitions. [2021-11-21 00:32:10,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-21 00:32:10,759 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 2.5288461538461537) internal successors, (263), 103 states have internal predecessors, (263), 0 states have call successors, (0), 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 188 [2021-11-21 00:32:10,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:10,760 INFO L225 Difference]: With dead ends: 315 [2021-11-21 00:32:10,760 INFO L226 Difference]: Without dead ends: 192 [2021-11-21 00:32:10,762 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 516 SyntacticMatches, 3 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=768, Invalid=29334, Unknown=0, NotChecked=0, Total=30102 [2021-11-21 00:32:10,763 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 282 mSDsluCounter, 2409 mSDsCounter, 0 mSdLazyCounter, 12391 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 2400 SdHoareTripleChecker+Invalid, 12514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 12391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:10,763 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 2400 Invalid, 12514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 12391 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-21 00:32:10,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-21 00:32:10,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 191. [2021-11-21 00:32:10,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0105263157894737) internal successors, (192), 190 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:10,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 192 transitions. [2021-11-21 00:32:10,767 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 192 transitions. Word has length 188 [2021-11-21 00:32:10,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:10,767 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 192 transitions. [2021-11-21 00:32:10,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 2.5288461538461537) internal successors, (263), 103 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:10,767 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 192 transitions. [2021-11-21 00:32:10,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2021-11-21 00:32:10,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:10,769 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 31, 1, 1, 1, 1] [2021-11-21 00:32:10,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:10,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-21 00:32:10,991 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:32:10,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:10,991 INFO L85 PathProgramCache]: Analyzing trace with hash 448168446, now seen corresponding path program 61 times [2021-11-21 00:32:10,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:10,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979889904] [2021-11-21 00:32:10,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:10,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:11,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:13,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 900 proven. 1952 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:13,106 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:13,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979889904] [2021-11-21 00:32:13,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979889904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:13,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [401508983] [2021-11-21 00:32:13,106 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:32:13,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:13,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:13,107 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:13,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-21 00:32:13,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:13,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 167 conjunts are in the unsatisfiable core [2021-11-21 00:32:13,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:15,358 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 900 proven. 1952 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:15,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:32:17,772 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 [2021-11-21 00:32:17,938 INFO L134 CoverageAnalysis]: Checked inductivity of 2852 backedges. 900 proven. 1952 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:17,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [401508983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:32:17,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574291147] [2021-11-21 00:32:17,939 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:32:17,939 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:32:17,939 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:32:17,939 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:32:17,939 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:32:17,964 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 6 treesize of output 5 [2021-11-21 00:32:18,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:32:18,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:32:18,226 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 136 treesize of output 128 [2021-11-21 00:32:18,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:32:18,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:32:20,740 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:32:21,942 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:32:21,942 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:32:21,942 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 65, 65] total 131 [2021-11-21 00:32:21,942 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869133478] [2021-11-21 00:32:21,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:32:21,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2021-11-21 00:32:21,943 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:21,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2021-11-21 00:32:21,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2289, Invalid=17171, Unknown=0, NotChecked=0, Total=19460 [2021-11-21 00:32:21,944 INFO L87 Difference]: Start difference. First operand 191 states and 192 transitions. Second operand has 133 states, 132 states have (on average 2.9166666666666665) internal successors, (385), 132 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:25,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:25,789 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2021-11-21 00:32:25,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-21 00:32:25,790 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 132 states have (on average 2.9166666666666665) internal successors, (385), 132 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 190 [2021-11-21 00:32:25,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:25,791 INFO L225 Difference]: With dead ends: 198 [2021-11-21 00:32:25,791 INFO L226 Difference]: Without dead ends: 198 [2021-11-21 00:32:25,792 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 666 GetRequests, 492 SyntacticMatches, 2 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8578 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=5162, Invalid=24940, Unknown=0, NotChecked=0, Total=30102 [2021-11-21 00:32:25,792 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 1025 mSDsluCounter, 1076 mSDsCounter, 0 mSdLazyCounter, 5989 mSolverCounterSat, 324 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1025 SdHoareTripleChecker+Valid, 1108 SdHoareTripleChecker+Invalid, 6313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 324 IncrementalHoareTripleChecker+Valid, 5989 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:25,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1025 Valid, 1108 Invalid, 6313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [324 Valid, 5989 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-21 00:32:25,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-21 00:32:25,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 195. [2021-11-21 00:32:25,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0103092783505154) internal successors, (196), 194 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:25,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2021-11-21 00:32:25,796 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 190 [2021-11-21 00:32:25,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:25,797 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2021-11-21 00:32:25,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 132 states have (on average 2.9166666666666665) internal successors, (385), 132 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:25,797 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2021-11-21 00:32:25,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-21 00:32:25,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:25,798 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 1, 1, 1, 1] [2021-11-21 00:32:25,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:26,014 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-21 00:32:26,015 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:32:26,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:26,015 INFO L85 PathProgramCache]: Analyzing trace with hash -107454285, now seen corresponding path program 62 times [2021-11-21 00:32:26,015 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:26,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654704352] [2021-11-21 00:32:26,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:26,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:26,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:28,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2977 backedges. 94 proven. 2883 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:28,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:28,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654704352] [2021-11-21 00:32:28,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654704352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:28,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413004809] [2021-11-21 00:32:28,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:32:28,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:28,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:28,615 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:28,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-21 00:32:36,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-11-21 00:32:36,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:32:36,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 204 conjunts are in the unsatisfiable core [2021-11-21 00:32:36,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:38,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-21 00:32:38,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2977 backedges. 94 proven. 2883 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:38,595 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:32:38,959 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 [2021-11-21 00:32:38,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-21 00:32:39,566 INFO L134 CoverageAnalysis]: Checked inductivity of 2977 backedges. 94 proven. 2883 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:39,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413004809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:32:39,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088578309] [2021-11-21 00:32:39,568 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 00:32:39,568 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:32:39,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:32:39,569 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:32:39,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:32:39,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-21 00:32:39,697 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 20 treesize of output 16 [2021-11-21 00:32:39,914 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-21 00:32:39,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 135 [2021-11-21 00:32:40,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-21 00:32:40,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-21 00:32:42,152 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:32:43,535 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:32:43,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:32:43,536 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 106 [2021-11-21 00:32:43,536 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749226140] [2021-11-21 00:32:43,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:32:43,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-21 00:32:43,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:43,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-21 00:32:43,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=12594, Unknown=0, NotChecked=0, Total=12882 [2021-11-21 00:32:43,537 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand has 107 states, 107 states have (on average 2.532710280373832) internal successors, (271), 106 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:51,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:51,772 INFO L93 Difference]: Finished difference Result 325 states and 326 transitions. [2021-11-21 00:32:51,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-21 00:32:51,773 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 2.532710280373832) internal successors, (271), 106 states have internal predecessors, (271), 0 states have call successors, (0), 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 194 [2021-11-21 00:32:51,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:51,774 INFO L225 Difference]: With dead ends: 325 [2021-11-21 00:32:51,774 INFO L226 Difference]: Without dead ends: 198 [2021-11-21 00:32:51,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 713 GetRequests, 533 SyntacticMatches, 3 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3673 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=790, Invalid=31072, Unknown=0, NotChecked=0, Total=31862 [2021-11-21 00:32:51,776 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 579 mSDsluCounter, 2441 mSDsCounter, 0 mSdLazyCounter, 12397 mSolverCounterSat, 221 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 2437 SdHoareTripleChecker+Invalid, 12714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 221 IncrementalHoareTripleChecker+Valid, 12397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 96 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:51,776 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 2437 Invalid, 12714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [221 Valid, 12397 Invalid, 0 Unknown, 96 Unchecked, 4.4s Time] [2021-11-21 00:32:51,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-21 00:32:51,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2021-11-21 00:32:51,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 196 states have (on average 1.010204081632653) internal successors, (198), 196 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:51,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2021-11-21 00:32:51,779 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 194 [2021-11-21 00:32:51,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:51,780 INFO L470 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2021-11-21 00:32:51,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 2.532710280373832) internal successors, (271), 106 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:32:51,780 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2021-11-21 00:32:51,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2021-11-21 00:32:51,781 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:51,781 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 32, 1, 1, 1, 1] [2021-11-21 00:32:51,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:51,987 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:51,987 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 7 more)] === [2021-11-21 00:32:51,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:51,987 INFO L85 PathProgramCache]: Analyzing trace with hash 577753848, now seen corresponding path program 63 times [2021-11-21 00:32:51,987 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:51,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577659998] [2021-11-21 00:32:51,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:51,988 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:52,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:54,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 961 proven. 2079 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:32:54,028 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:54,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577659998] [2021-11-21 00:32:54,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577659998] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:54,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380085102] [2021-11-21 00:32:54,029 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:32:54,029 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:54,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:54,029 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:54,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6af9ec9c-0a90-49a8-98e4-789310d68d11/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-21 00:32:54,628 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:32:54,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:32:54,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 1008 conjuncts, 177 conjunts are in the unsatisfiable core [2021-11-21 00:32:54,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:54,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5